diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-04 09:30:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-04 09:30:33 -0700 |
| commit | ecefbd94b834fa32559d854646d777c56749ef1c (patch) | |
| tree | ca8958900ad9e208a8e5fb7704f1b66dc76131b4 | |
| parent | ce57e981f2b996aaca2031003b3f866368307766 (diff) | |
| parent | 3d11df7abbff013b811d5615320580cd5d9d7d31 (diff) | |
Merge tag 'kvm-3.7-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM updates from Avi Kivity:
"Highlights of the changes for this release include support for vfio
level triggered interrupts, improved big real mode support on older
Intels, a streamlines guest page table walker, guest APIC speedups,
PIO optimizations, better overcommit handling, and read-only memory."
* tag 'kvm-3.7-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (138 commits)
KVM: s390: Fix vcpu_load handling in interrupt code
KVM: x86: Fix guest debug across vcpu INIT reset
KVM: Add resampling irqfds for level triggered interrupts
KVM: optimize apic interrupt delivery
KVM: MMU: Eliminate pointless temporary 'ac'
KVM: MMU: Avoid access/dirty update loop if all is well
KVM: MMU: Eliminate eperm temporary
KVM: MMU: Optimize is_last_gpte()
KVM: MMU: Simplify walk_addr_generic() loop
KVM: MMU: Optimize pte permission checks
KVM: MMU: Update accessed and dirty bits after guest pagetable walk
KVM: MMU: Move gpte_access() out of paging_tmpl.h
KVM: MMU: Optimize gpte_access() slightly
KVM: MMU: Push clean gpte write protection out of gpte_access()
KVM: clarify kvmclock documentation
KVM: make processes waiting on vcpu mutex killable
KVM: SVM: Make use of asm.h
KVM: VMX: Make use of asm.h
KVM: VMX: Make lto-friendly
KVM: x86: lapic: Clean up find_highest_vector() and count_vectors()
...
Conflicts:
arch/s390/include/asm/processor.h
arch/x86/kvm/i8259.c
62 files changed, 3006 insertions, 1466 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index bf33aaa4c59f..f6ec3a92e621 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -857,7 +857,8 @@ struct kvm_userspace_memory_region { }; /* for kvm_memory_region::flags */ -#define KVM_MEM_LOG_DIRTY_PAGES 1UL +#define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) +#define KVM_MEM_READONLY (1UL << 1) This ioctl allows the user to create or modify a guest physical memory slot. When changing an existing slot, it may be moved in the guest @@ -873,14 +874,17 @@ It is recommended that the lower 21 bits of guest_phys_addr and userspace_addr be identical. This allows large pages in the guest to be backed by large pages in the host. -The flags field supports just one flag, KVM_MEM_LOG_DIRTY_PAGES, which -instructs kvm to keep track of writes to memory within the slot. See -the KVM_GET_DIRTY_LOG ioctl. +The flags field supports two flag, KVM_MEM_LOG_DIRTY_PAGES, which instructs +kvm to keep track of writes to memory within the slot. See KVM_GET_DIRTY_LOG +ioctl. The KVM_CAP_READONLY_MEM capability indicates the availability of the +KVM_MEM_READONLY flag. When this flag is set for a memory region, KVM only +allows read accesses. Writes will be posted to userspace as KVM_EXIT_MMIO +exits. -When the KVM_CAP_SYNC_MMU capability, changes in the backing of the memory -region are automatically reflected into the guest. For example, an mmap() -that affects the region will be made visible immediately. Another example -is madvise(MADV_DROP). +When the KVM_CAP_SYNC_MMU capability is available, changes in the backing of +the memory region are automatically reflected into the guest. For example, an +mmap() that affects the region will be made visible immediately. Another +example is madvise(MADV_DROP). It is recommended to use this API instead of the KVM_SET_MEMORY_REGION ioctl. The KVM_SET_MEMORY_REGION does not allow fine grained control over memory @@ -1946,6 +1950,19 @@ the guest using the specified gsi pin. The irqfd is removed using the KVM_IRQFD_FLAG_DEASSIGN flag, specifying both kvm_irqfd.fd and kvm_irqfd.gsi. +With KVM_CAP_IRQFD_RESAMPLE, KVM_IRQFD supports a de-assert and notify +mechanism allowing emulation of level-triggered, irqfd-based +interrupts. When KVM_IRQFD_FLAG_RESAMPLE is set the user must pass an +additional eventfd in the kvm_irqfd.resamplefd field. When operating +in resample mode, posting of an interrupt through kvm_irq.fd asserts +the specified gsi in the irqchip. When the irqchip is resampled, such +as from an EOI, the gsi is de-asserted and the user is notifed via +kvm_irqfd.resamplefd. It is the user's responsibility to re-queue +the interrupt if the device making use of it still requires service. +Note that closing the resamplefd is not sufficient to disable the +irqfd. The KVM_IRQFD_FLAG_RESAMPLE is only necessary on assignment +and need not be specified with KVM_IRQFD_FLAG_DEASSIGN. + 4.76 KVM_PPC_ALLOCATE_HTAB Capability: KVM_CAP_PPC_ALLOC_HTAB diff --git a/Documentation/virtual/kvm/hypercalls.txt b/Documentation/virtual/kvm/hypercalls.txt new file mode 100644 index 000000000000..ea113b5d87a4 --- /dev/null +++ b/Documentation/virtual/kvm/hypercalls.txt @@ -0,0 +1,66 @@ +Linux KVM Hypercall: +=================== +X86: + KVM Hypercalls have a three-byte sequence of either the vmcall or the vmmcall + instruction. The hypervisor can replace it with instructions that are + guaranteed to be supported. + + Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively. + The hypercall number should be placed in rax and the return value will be + placed in rax. No other registers will be clobbered unless explicitly stated + by the particular hypercall. + +S390: + R2-R7 are used for parameters 1-6. In addition, R1 is used for hypercall + number. The return value is written to R2. + + S390 uses diagnose instruction as hypercall (0x500) along with hypercall + number in R1. + + PowerPC: + It uses R3-R10 and hypercall number in R11. R4-R11 are used as output registers. + Return value is placed in R3. + + KVM hypercalls uses 4 byte opcode, that are patched with 'hypercall-instructions' + property inside the device tree's /hypervisor node. + For more information refer to Documentation/virtual/kvm/ppc-pv.txt + +KVM Hypercalls Documentation +=========================== +The template for each hypercall is: +1. Hypercall name. +2. Architecture(s) +3. Status (deprecated, obsolete, active) +4. Purpose + +1. KVM_HC_VAPIC_POLL_IRQ +------------------------ +Architecture: x86 +Status: active +Purpose: Trigger guest exit so that the host can check for pending +interrupts on reentry. + +2. KVM_HC_MMU_OP +------------------------ +Architecture: x86 +Status: deprecated. +Purpose: Support MMU operations such as writing to PTE, +flushing TLB, release PT. + +3. KVM_HC_FEATURES +------------------------ +Architecture: PPC +Status: active +Purpose: Expose hypercall availability to the guest. On x86 platforms, cpuid +used to enumerate which hypercalls are available. On PPC, either device tree +based lookup ( which is also what EPAPR dictates) OR KVM specific enumeration +mechanism (which is this hypercall) can be used. + +4. KVM_HC_PPC_MAP_MAGIC_PAGE +------------------------ +Architecture: PPC +Status: active +Purpose: To enable communication between the hypervisor and guest there is a +shared page that contains parts of supervisor visible register state. +The guest can map this shared page to access its supervisor register through +memory using this hypercall. diff --git a/Documentation/virtual/kvm/msr.txt b/Documentation/virtual/kvm/msr.txt index 730471048583..6d470ae7b073 100644 --- a/Documentation/virtual/kvm/msr.txt +++ b/Documentation/virtual/kvm/msr.txt @@ -34,9 +34,12 @@ MSR_KVM_WALL_CLOCK_NEW: 0x4b564d00 time information and check that they are both equal and even. An odd version indicates an in-progress update. - sec: number of seconds for wallclock. + sec: number of seconds for wallclock at time of boot. - nsec: number of nanoseconds for wallclock. + nsec: number of nanoseconds for wallclock at time of boot. + + In order to get the current wallclock time, the system_time from + MSR_KVM_SYSTEM_TIME_NEW needs to be added. Note that although MSRs are per-CPU entities, the effect of this particular MSR is global. @@ -82,20 +85,25 @@ MSR_KVM_SYSTEM_TIME_NEW: 0x4b564d01 time at the time this structure was last updated. Unit is nanoseconds. - tsc_to_system_mul: a function of the tsc frequency. One has - to multiply any tsc-related quantity by this value to get - a value in nanoseconds, besides dividing by 2^tsc_shift + tsc_to_system_mul: multiplier to be used when converting + tsc-related quantity to nanoseconds - tsc_shift: cycle to nanosecond divider, as a power of two, to - allow for shift rights. One has to shift right any tsc-related - quantity by this value to get a value in nanoseconds, besides - multiplying by tsc_to_system_mul. + tsc_shift: shift to be used when converting tsc-related + quantity to nanoseconds. This shift will ensure that + multiplication with tsc_to_system_mul does not overflow. + A positive value denotes a left shift, a negative value + a right shift. - With this information, guests can derive per-CPU time by - doing: + The conversion from tsc to nanoseconds involves an additional + right shift by 32 bits. With this information, guests can + derive per-CPU time by doing: time = (current_tsc - tsc_timestamp) - time = (time * tsc_to_system_mul) >> tsc_shift + if (tsc_shift >= 0) + time <<= tsc_shift; + else + time >>= -tsc_shift; + time = (time * tsc_to_system_mul) >> 32 time = time + system_time flags: bits in this field indicate extended capabilities diff --git a/Documentation/virtual/kvm/ppc-pv.txt b/Documentation/virtual/kvm/ppc-pv.txt index 4911cf95c67e..4cd076febb02 100644 --- a/Documentation/virtual/kvm/ppc-pv.txt +++ b/Documentation/virtual/kvm/ppc-pv.txt @@ -174,3 +174,25 @@ following: That way we can inject an arbitrary amount of code as replacement for a single instruction. This allows us to check for pending interrupts when setting EE=1 for example. + +Hypercall ABIs in KVM on PowerPC +================================= +1) KVM hypercalls (ePAPR) + +These are ePAPR compliant hypercall implementation (mentioned above). Even +generic hypercalls are implemented here, like the ePAPR idle hcall. These are +available on all targets. + +2) PAPR hypercalls + +PAPR hypercalls are needed to run server PowerPC PAPR guests (-M pseries in QEMU). +These are the same hypercalls that pHyp, the POWER hypervisor implements. Some of +them are handled in the kernel, some are handled in user space. This is only +available on book3s_64. + +3) OSI hypercalls + +Mac-on-Linux is another user of KVM on PowerPC, which has its own hypercall (long +before KVM). This is supported to maintain compatibility. All these hypercalls get +forwarded to user space. This is only useful on book3s_32, but can be used with +book3s_64 as well. diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c index bd77cb507c1c..8b3a9c0e771d 100644 --- a/arch/ia64/kvm/kvm-ia64.c +++ b/arch/ia64/kvm/kvm-ia64.c @@ -924,6 +924,16 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) return 0; } +int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event) +{ + if (!irqchip_in_kernel(kvm)) + return -ENXIO; + + irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, + irq_event->irq, irq_event->level); + return 0; +} + long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -963,29 +973,6 @@ long kvm_arch_vm_ioctl(struct file *filp, goto out; } break; - case KVM_IRQ_LINE_STATUS: - case KVM_IRQ_LINE: { - struct kvm_irq_level irq_event; - - r = -EFAULT; - if (copy_from_user(&irq_event, argp, sizeof irq_event)) - goto out; - r = -ENXIO; - if (irqchip_in_kernel(kvm)) { - __s32 status; - status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, - irq_event.irq, irq_event.level); - if (ioctl == KVM_IRQ_LINE_STATUS) { - r = -EFAULT; - irq_event.status = status; - if (copy_to_user(argp, &irq_event, - sizeof irq_event)) - goto out; - } - r = 0; - } - break; - } case KVM_GET_IRQCHIP: { /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ struct kvm_irqchip chip; @@ -1626,11 +1613,17 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, return; } -void kvm_arch_flush_shadow(struct kvm *kvm) +void kvm_arch_flush_shadow_all(struct kvm *kvm) { kvm_flush_remote_tlbs(kvm); } +void kvm_arch_flush_shadow_memslot(struct kvm *kvm, + struct kvm_memory_slot *slot) +{ + kvm_arch_flush_shadow_all(); +} + long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index a8bf5c673a3c..28e8f5e5c63e 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -53,6 +53,8 @@ struct kvm; extern int kvm_unmap_hva(struct kvm *kvm, unsigned long hva); +extern int kvm_unmap_hva_range(struct kvm *kvm, + unsigned long start, unsigned long end); extern int kvm_age_hva(struct kvm *kvm, unsigned long hva); extern int kvm_test_age_hva(struct kvm *kvm, unsigned long hva); extern void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte); @@ -220,6 +222,7 @@ struct revmap_entry { #define KVMPPC_GOT_PAGE 0x80 struct kvm_arch_memory_slot { + unsigned long *rmap; }; struct kvm_arch { diff --git a/arch/powerpc/kvm/44x_tlb.c b/arch/powerpc/kvm/44x_tlb.c index 33aa715dab28..5dd3ab469976 100644 --- a/arch/powerpc/kvm/44x_tlb.c +++ b/arch/powerpc/kvm/44x_tlb.c @@ -319,7 +319,6 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gpa_t gpaddr, if (is_error_page(new_page)) { printk(KERN_ERR "Couldn't get guest page for gfn %llx!\n", (unsigned long long)gfn); - kvm_release_page_clean(new_page); return; } hpaddr = page_to_phys(new_page); diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index d03eb6f7b058..d95d11322a15 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -705,7 +705,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, goto out_unlock; hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; - rmap = &memslot->rmap[gfn - memslot->base_gfn]; + rmap = &memslot->arch.rmap[gfn - memslot->base_gfn]; lock_rmap(rmap); /* Check if we might have been invalidated; let the guest retry if so */ @@ -756,9 +756,12 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, goto out_put; } -static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, - int (*handler)(struct kvm *kvm, unsigned long *rmapp, - unsigned long gfn)) +static int kvm_handle_hva_range(struct kvm *kvm, + unsigned long start, + unsigned long end, + int (*handler)(struct kvm *kvm, + unsigned long *rmapp, + unsigned long gfn)) { int ret; int retval = 0; @@ -767,15 +770,25 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, slots = kvm_memslots(kvm); kvm_for_each_memslot(memslot, slots) { - unsigned long start = memslot->userspace_addr; - unsigned long end; + unsigned long hva_start, hva_end; + gfn_t gfn, gfn_end; - end = start + (memslot->npages << PAGE_SHIFT); - if (hva >= start && hva < end) { - gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT; + hva_start = max(start, memslot->userspace_addr); + hva_end = min(end, memslot->userspace_addr + + (memslot->npages << PAGE_SHIFT)); + if (hva_start >= hva_end) + continue; + /* + * {gfn(page) | page intersects with [hva_start, hva_end)} = + * {gfn, gfn+1, ..., gfn_end-1}. + */ + gfn = hva_to_gfn_memslot(hva_start, memslot); + gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); + + for (; gfn < gfn_end; ++gfn) { + gfn_t gfn_offset = gfn - memslot->base_gfn; - ret = handler(kvm, &memslot->rmap[gfn_offset], - memslot->base_gfn + gfn_offset); + ret = handler(kvm, &memslot->arch.rmap[gfn_offset], gfn); retval |= ret; } } @@ -783,6 +796,13 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, return retval; } +static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, + int (*handler)(struct kvm *kvm, unsigned long *rmapp, + unsigned long gfn)) +{ + return kvm_handle_hva_range(kvm, hva, hva + 1, handler); +} + static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, unsigned long gfn) { @@ -850,6 +870,13 @@ int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) return 0; } +int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end) +{ + if (kvm->arch.using_mmu_notifiers) + kvm_handle_hva_range(kvm, start, end, kvm_unmap_rmapp); + return 0; +} + static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, unsigned long gfn) { @@ -1009,7 +1036,7 @@ long kvmppc_hv_get_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot) unsigned long *rmapp, *map; preempt_disable(); - rmapp = memslot->rmap; + rmapp = memslot->arch.rmap; map = memslot->dirty_bitmap; for (i = 0; i < memslot->npages; ++i) { if (kvm_test_clear_dirty(kvm, rmapp)) diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 5c70d19494f9..fb0e821622d4 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -84,7 +84,7 @@ static void remove_revmap_chain(struct kvm *kvm, long pte_index, if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) return; - rmap = real_vmalloc_addr(&memslot->rmap[gfn - memslot->base_gfn]); + rmap = real_vmalloc_addr(&memslot->arch.rmap[gfn - memslot->base_gfn]); lock_rmap(rmap); head = *rmap & KVMPPC_RMAP_INDEX; @@ -180,7 +180,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, if (!slot_is_aligned(memslot, psize)) return H_PARAMETER; slot_fn = gfn - memslot->base_gfn; - rmap = &memslot->rmap[slot_fn]; + rmap = &memslot->arch.rmap[slot_fn]; if (!kvm->arch.using_mmu_notifiers) { physp = kvm->arch.slot_phys[memslot->id]; @@ -197,7 +197,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, pa &= PAGE_MASK; } else { /* Translate to host virtual address */ - hva = gfn_to_hva_memslot(memslot, gfn); + hva = __gfn_to_hva_memslot(memslot, gfn); /* Look up the Linux PTE for the backing page */ pte_size = psize; diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index a1baec340f7e..05c28f59f77f 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -242,10 +242,8 @@ static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte) int i; hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT); - if (is_error_page(hpage)) { - kvm_release_page_clean(hpage); + if (is_error_page(hpage)) return; - } hpage_offset = pte->raddr & ~PAGE_MASK; hpage_offset &= ~0xFFFULL; diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index a2b66717813d..ff38b664195d 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -520,11 +520,10 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, if (likely(!pfnmap)) { unsigned long tsize_pages = 1 << (tsize + 10 - PAGE_SHIFT); - pfn = gfn_to_pfn_memslot(vcpu_e500->vcpu.kvm, slot, gfn); + pfn = gfn_to_pfn_memslot(slot, gfn); if (is_error_pfn(pfn)) { printk(KERN_ERR "Couldn't get real page for gfn %lx!\n", (long)gfn); - kvm_release_pfn_clean(pfn); return; } diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 87f4dc886076..4d213b8b0fb5 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -302,10 +302,18 @@ long kvm_arch_dev_ioctl(struct file *filp, void kvm_arch_free_memslot(struct kvm_memory_slot *free, struct kvm_memory_slot *dont) { + if (!dont || free->arch.rmap != dont->arch.rmap) { + vfree(free->arch.rmap); + free->arch.rmap = NULL; + } } int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) { + slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap)); + if (!slot->arch.rmap) + return -ENOMEM; + return 0; } @@ -326,8 +334,12 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, kvmppc_core_commit_memory_region(kvm, mem); } +void kvm_arch_flush_shadow_all(struct kvm *kvm) +{ +} -void kvm_arch_flush_shadow(struct kvm *kvm) +void kvm_arch_flush_shadow_memslot(struct kvm *kvm, + struct kvm_memory_slot *slot) { } diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index f3e0aabfc6bc..56831dfa9198 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -159,6 +159,7 @@ extern unsigned long thread_saved_pc(struct task_struct *t); extern void show_code(struct pt_regs *regs); extern void print_fn_code(unsigned char *code, unsigned long len); +extern int insn_to_mnemonic(unsigned char *instruction, char buf[8]); unsigned long get_wchan(struct task_struct *p); #define task_pt_regs(tsk) ((struct pt_regs *) \ diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c index cc84a24c023f..f00286bd2ef9 100644 --- a/arch/s390/kernel/dis.c +++ b/arch/s390/kernel/dis.c @@ -1501,6 +1501,33 @@ static struct insn *find_insn(unsigned char *code) return NULL; } +/** + * insn_to_mnemonic - decode an s390 instruction + * @instruction: instruction to decode + * @buf: buffer to fill with mnemonic + * + * Decode the instruction at @instruction and store the corresponding + * mnemonic into @buf. + * @buf is left unchanged if the instruction could not be decoded. + * Returns: + * %0 on success, %-ENOENT if the instruction was not found. + */ +int insn_to_mnemonic(unsigned char *instruction, char buf[8]) +{ + struct insn *insn; + + insn = find_insn(instruction); + if (!insn) + return -ENOENT; + if (insn->name[0] == '\0') + snprintf(buf, sizeof(buf), "%s", + long_insn_name[(int) insn->name[1]]); + else + snprintf(buf, sizeof(buf), "%.5s", insn->name); + return 0; +} +EXPORT_SYMBOL_GPL(insn_to_mnemonic); + static int print_insn(char *buffer, unsigned char *code, unsigned long addr) { struct insn *insn; diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig index 9b04a32e5695..b58dd869cb32 100644 --- a/arch/s390/kvm/Kconfig +++ b/arch/s390/kvm/Kconfig @@ -21,6 +21,7 @@ config KVM depends on HAVE_KVM && EXPERIMENTAL select PREEMPT_NOTIFIERS select ANON_INODES + select HAVE_KVM_CPU_RELAX_INTERCEPT ---help--- Support hosting paravirtualized guest machines using the SIE virtualization capability on the mainframe. This should work diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c index c88bb7793390..a390687feb13 100644 --- a/arch/s390/kvm/diag.c +++ b/arch/s390/kvm/diag.c @@ -14,6 +14,8 @@ #include <linux/kvm.h> #include <linux/kvm_host.h> #include "kvm-s390.h" +#include "trace.h" +#include "trace-s390.h" static int diag_release_pages(struct kvm_vcpu *vcpu) { @@ -98,6 +100,7 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu) vcpu->run->exit_reason = KVM_EXIT_S390_RESET; VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx", vcpu->run->s390_reset_flags); + trace_kvm_s390_request_resets(vcpu->run->s390_reset_flags); return -EREMOTE; } @@ -105,6 +108,7 @@ int kvm_s390_handle_diag(struct kvm_vcpu *vcpu) { int code = (vcpu->arch.sie_block->ipb & 0xfff0000) >> 16; + trace_kvm_s390_handle_diag(vcpu, code); switch (code) { case 0x10: return diag_release_pages(vcpu); diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c index adae539f12e2..22798ec33fd1 100644 --- a/arch/s390/kvm/intercept.c +++ b/arch/s390/kvm/intercept.c @@ -19,6 +19,8 @@ #include "kvm-s390.h" #include "gaccess.h" +#include "trace.h" +#include "trace-s390.h" static int handle_lctlg(struct kvm_vcpu *vcpu) { @@ -45,6 +47,7 @@ static int handle_lctlg(struct kvm_vcpu *vcpu) VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2, disp2); + trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr); do { rc = get_guest_u64(vcpu, useraddr, @@ -82,6 +85,7 @@ static int handle_lctl(struct kvm_vcpu *vcpu) VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2, disp2); + trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr); reg = reg1; do { @@ -135,6 +139,8 @@ static int handle_stop(struct kvm_vcpu *vcpu) vcpu->stat.exit_stop_request++; spin_lock_bh(&vcpu->arch.local_int.lock); + trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits); + if (vcpu->arch.local_int.action_bits & ACTION_RELOADVCPU_ON_STOP) { vcpu->arch.local_int.action_bits &= ~ACTION_RELOADVCPU_ON_STOP; rc = SIE_INTERCEPT_RERUNVCPU; @@ -171,6 +177,7 @@ static int handle_validity(struct kvm_vcpu *vcpu) int rc; vcpu->stat.exit_validity++; + trace_kvm_s390_intercept_validity(vcpu, viwhy); if (viwhy == 0x37) { vmaddr = gmap_fault(vcpu->arch.sie_block->prefix, vcpu->arch.gmap); @@ -213,6 +220,9 @@ static int handle_instruction(struct kvm_vcpu *vcpu) intercept_handler_t handler; vcpu->stat.exit_instruction++; + trace_kvm_s390_intercept_instruction(vcpu, + vcpu->arch.sie_block->ipa, + vcpu->arch.sie_block->ipb); handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8]; if (handler) return handler(vcpu); @@ -222,6 +232,7 @@ static int handle_instruction(struct kvm_vcpu *vcpu) static int handle_prog(struct kvm_vcpu *vcpu) { vcpu->stat.exit_program_interruption++; + trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc); return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc); } diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index b7bc1aac8ed2..ff1e2f8ef94a 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -19,6 +19,7 @@ #include <asm/uaccess.h> #include "kvm-s390.h" #include "gaccess.h" +#include "trace-s390.h" static int psw_extint_disabled(struct kvm_vcpu *vcpu) { @@ -130,6 +131,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, case KVM_S390_INT_EMERGENCY: VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg"); vcpu->stat.deliver_emergency_signal++; + trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, + inti->emerg.code, 0); rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201); if (rc == -EFAULT) exception = 1; @@ -152,6 +155,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, case KVM_S390_INT_EXTERNAL_CALL: VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call"); vcpu->stat.deliver_external_call++; + trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, + inti->extcall.code, 0); rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202); if (rc == -EFAULT) exception = 1; @@ -175,6 +180,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x", inti->ext.ext_params); vcpu->stat.deliver_service_signal++; + trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, + inti->ext.ext_params, 0); rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401); if (rc == -EFAULT) exception = 1; @@ -198,6 +205,9 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx", inti->ext.ext_params, inti->ext.ext_params2); vcpu->stat.deliver_virtio_interrupt++; + trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, + inti->ext.ext_params, + inti->ext.ext_params2); rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603); if (rc == -EFAULT) exception = 1; @@ -229,6 +239,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, case KVM_S390_SIGP_STOP: VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop"); vcpu->stat.deliver_stop_signal++; + trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, + 0, 0); __set_intercept_indicator(vcpu, inti); break; @@ -236,12 +248,16 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", inti->prefix.address); vcpu->stat.deliver_prefix_signal++; + trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, + inti->prefix.address, 0); kvm_s390_set_prefix(vcpu, inti->prefix.address); break; case KVM_S390_RESTART: VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart"); vcpu->stat.deliver_restart_signal++; + trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, + 0, 0); rc = copy_to_guest(vcpu, offsetof(struct _lowcore, restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); if (rc == -EFAULT) @@ -259,6 +275,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, inti->pgm.code, table[vcpu->arch.sie_block->ipa >> 14]); vcpu->stat.deliver_program_int++; + trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, + inti->pgm.code, 0); rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code); if (rc == -EFAULT) exception = 1; @@ -405,9 +423,7 @@ no_timer: set_current_state(TASK_INTERRUPTIBLE); spin_unlock_bh(&vcpu->arch.local_int.lock); spin_unlock(&vcpu->arch.local_int.float_int->lock); - vcpu_put(vcpu); schedule(); - vcpu_load(vcpu); spin_lock(&vcpu->arch.local_int.float_int->lock); spin_lock_bh(&vcpu->arch.local_int.lock); } @@ -515,6 +531,7 @@ int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code) inti->pgm.code = code; VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code); + trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1); spin_lock_bh(&li->lock); list_add(&inti->list, &li->list); atomic_set(&li->active, 1); @@ -556,6 +573,8 @@ int kvm_s390_inject_vm(struct kvm *kvm, kfree(inti); return -EINVAL; } + trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64, + 2); mutex_lock(&kvm->lock); fi = &kvm->arch.float_int; @@ -621,6 +640,8 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, kfree(inti); return -EINVAL; } + trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm, + s390int->parm64, 2); mutex_lock(&vcpu->kvm->lock); li = &vcpu->arch.local_int; diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index d470ccbfabae..ecced9d18986 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -32,6 +32,10 @@ #include "kvm-s390.h" #include "gaccess.h" +#define CREATE_TRACE_POINTS +#include "trace.h" +#include "trace-s390.h" + #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU struct kvm_stats_debugfs_item debugfs_entries[] = { @@ -242,6 +246,7 @@ out_err: void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) { VCPU_EVENT(vcpu, 3, "%s", "free cpu"); + trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); if (!kvm_is_ucontrol(vcpu->kvm)) { clear_bit(63 - vcpu->vcpu_id, (unsigned long *) &vcpu->kvm->arch.sca->mcn); @@ -417,6 +422,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, goto out_free_sie_block; VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu, vcpu->arch.sie_block); + trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block); return vcpu; out_free_sie_block: @@ -607,18 +613,22 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) local_irq_enable(); VCPU_EVENT(vcpu, 6, "entering sie flags %x", atomic_read(&vcpu->arch.sie_block->cpuflags)); + trace_kvm_s390_sie_enter(vcpu, + atomic_read(&vcpu->arch.sie_block->cpuflags)); rc = sie64a(vcpu->arch.sie_block, vcpu->run->s.regs.gprs); if (rc) { if (kvm_is_ucontrol(vcpu->kvm)) { rc = SIE_INTERCEPT_UCONTROL; } else { VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); + trace_kvm_s390_sie_fault(vcpu); kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); rc = 0; } } VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", vcpu->arch.sie_block->icptcode); + trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); local_irq_disable(); kvm_guest_exit(); local_irq_enable(); @@ -959,7 +969,12 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, return; } -void kvm_arch_flush_shadow(struct kvm *kvm) +void kvm_arch_flush_shadow_all(struct kvm *kvm) +{ +} + +void kvm_arch_flush_shadow_memslot(struct kvm *kvm, + struct kvm_memory_slot *slot) { } diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 310be61bead7..d768906f15c8 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -20,6 +20,7 @@ #include <asm/sysinfo.h> #include "gaccess.h" #include "kvm-s390.h" +#include "trace.h" static int handle_set_prefix(struct kvm_vcpu *vcpu) { @@ -59,6 +60,7 @@ static int handle_set_prefix(struct kvm_vcpu *vcpu) kvm_s390_set_prefix(vcpu, address); VCPU_EVENT(vcpu, 5, "setting prefix to %x", address); + trace_kvm_s390_handle_prefix(vcpu, 1, address); out: return 0; } @@ -91,6 +93,7 @@ static int handle_store_prefix(struct kvm_vcpu *vcpu) } VCPU_EVENT(vcpu, 5, "storing prefix to %x", address); + trace_kvm_s390_handle_prefix(vcpu, 0, address); out: return 0; } @@ -119,6 +122,7 @@ static int handle_store_cpu_address(struct kvm_vcpu *vcpu) } VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr); + trace_kvm_s390_handle_stap(vcpu, useraddr); out: return 0; } @@ -164,9 +168,11 @@ static int handle_stfl(struct kvm_vcpu *vcpu) &facility_list, sizeof(facility_list)); if (rc == -EFAULT) kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); - else + else { VCPU_EVENT(vcpu, 5, "store facility list value %x", facility_list); + trace_kvm_s390_handle_stfl(vcpu, facility_list); + } return 0; } @@ -278,6 +284,7 @@ static int handle_stsi(struct kvm_vcpu *vcpu) kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); goto out_mem; } + trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); free_page(mem); vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); vcpu->run->s.regs.gprs[0] = 0; diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c index 56f80e1f98f7..566ddf6e8dfb 100644 --- a/arch/s390/kvm/sigp.c +++ b/arch/s390/kvm/sigp.c @@ -18,6 +18,7 @@ #include <asm/sigp.h> #include "gaccess.h" #include "kvm-s390.h" +#include "trace.h" static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, u64 *reg) @@ -344,6 +345,7 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) else parameter = vcpu->run->s.regs.gprs[r1 + 1]; + trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter); switch (order_code) { case SIGP_SENSE: vcpu->stat.instruction_sigp_sense++; diff --git a/arch/s390/kvm/trace-s390.h b/arch/s390/kvm/trace-s390.h new file mode 100644 index 000000000000..90fdf85b5ff7 --- /dev/null +++ b/arch/s390/kvm/trace-s390.h @@ -0,0 +1,210 @@ +#if !defined(_TRACE_KVMS390_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_KVMS390_H + +#include <linux/tracepoint.h> + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM kvm-s390 +#define TRACE_INCLUDE_PATH . +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE trace-s390 + +/* + * Trace point for the creation of the kvm instance. + */ +TRACE_EVENT(kvm_s390_create_vm, + TP_PROTO(unsigned long type), + TP_ARGS(type), + + TP_STRUCT__entry( + __field(unsigned long, type) + ), + + TP_fast_assign( + __entry->type = type; + ), + + TP_printk("create vm%s", + __entry->type & KVM_VM_S390_UCONTROL ? " (UCONTROL)" : "") + ); + +/* + * Trace points for creation and destruction of vpcus. + */ +TRACE_EVENT(kvm_s390_create_vcpu, + TP_PROTO(unsigned int id, struct kvm_vcpu *vcpu, + struct kvm_s390_sie_block *sie_block), + TP_ARGS(id, vcpu, sie_block), + + TP_STRUCT__entry( + __field(unsigned int, id) + __field(struct kvm_vcpu *, vcpu) + __field(struct kvm_s390_sie_block *, sie_block) + ), + + TP_fast_assign( + __entry->id = id; + __entry->vcpu = vcpu; + __entry->sie_block = sie_block; + ), + + TP_printk("create cpu %d at %p, sie block at %p", __entry->id, + __entry->vcpu, __entry->sie_block) + ); + +TRACE_EVENT(kvm_s390_destroy_vcpu, + TP_PROTO(unsigned int id), + TP_ARGS(id), + + TP_STRUCT__entry( + __field(unsigned int, id) + ), + + TP_fast_assign( + __entry->id = id; + ), + + TP_printk("destroy cpu %d", __entry->id) + ); + +/* + * Trace points for injection of interrupts, either per machine or + * per vcpu. + */ + +#define kvm_s390_int_type \ + {KVM_S390_SIGP_STOP, "sigp stop"}, \ + {KVM_S390_PROGRAM_INT, "program interrupt"}, \ + {KVM_S390_SIGP_SET_PREFIX, "sigp set prefix"}, \ + {KVM_S390_RESTART, "sigp restart"}, \ + {KVM_S390_INT_VIRTIO, "virtio interrupt"}, \ + {KVM_S390_INT_SERVICE, "sclp interrupt"}, \ + {KVM_S390_INT_EMERGENCY, "sigp emergency"}, \ + {KVM_S390_INT_EXTERNAL_CALL, "sigp ext call"} + +TRACE_EVENT(kvm_s390_inject_vm, + TP_PROTO(__u64 type, __u32 parm, __u64 parm64, int who), + TP_ARGS(type, parm, parm64, who), + + TP_STRUCT__entry( + __field(__u32, inttype) + __field(__u32, parm) + __field(__u64, parm64) + __field(int, who) + ), + + TP_fast_assign( + __entry->inttype = type & 0x00000000ffffffff; + __entry->parm = parm; + __entry->parm64 = parm64; + __entry->who = who; + ), + + TP_printk("inject%s: type:%x (%s) parm:%x parm64:%llx", + (__entry->who == 1) ? " (from kernel)" : + (__entry->who == 2) ? " (from user)" : "", + __entry->inttype, + __print_symbolic(__entry->inttype, kvm_s390_int_type), + __entry->parm, __entry->parm64) + ); + +TRACE_EVENT(kvm_s390_inject_vcpu, + TP_PROTO(unsigned int id, __u64 type, __u32 parm, __u64 parm64, \ + int who), + TP_ARGS(id, type, parm, parm64, who), + + TP_STRUCT__entry( + __field(int, id) + __field(__u32, inttype) + __field(__u32, parm) + __field(__u64, parm64) + __field(int, who) + ), + + TP_fast_assign( + __entry->id = id; + __entry->inttype = type & 0x00000000ffffffff; + __entry->parm = parm; + __entry->parm64 = parm64; + __entry->who = who; + ), + + TP_printk("inject%s (vcpu %d): type:%x (%s) parm:%x parm64:%llx", + (__entry->who == 1) ? " (from kernel)" : + (__entry->who == 2) ? " (from user)" : "", + __entry->id, __entry->inttype, + __print_symbolic(__entry->inttype, kvm_s390_int_type), + __entry->parm, __entry->parm64) + ); + +/* + * Trace point for the actual delivery of interrupts. + */ +TRACE_EVENT(kvm_s390_deliver_interrupt, + TP_PROTO(unsigned int id, __u64 type, __u32 data0, __u64 data1), + TP_ARGS(id, type, data0, data1), + + TP_STRUCT__entry( + __field(int, id) + __field(__u32, inttype) + __field(__u32, data0) + __field(__u64, data1) + ), + + TP_fast_assign( + __entry->id = id; + __entry->inttype = type & 0x00000000ffffffff; + __entry->data0 = data0; + __entry->data1 = data1; + ), + + TP_printk("deliver interrupt (vcpu %d): type:%x (%s) " \ + "data:%08x %016llx", + __entry->id, __entry->inttype, + __print_symbolic(__entry->inttype, kvm_s390_int_type), + __entry->data0, __entry->data1) + ); + +/* + * Trace point for resets that may be requested from userspace. + */ +TRACE_EVENT(kvm_s390_request_resets, + TP_PROTO(__u64 resets), + TP_ARGS(resets), + + TP_STRUCT__entry( + __field(__u64, resets) + ), + + TP_fast_assign( + __entry->resets = resets; + ), + + TP_printk("requesting userspace resets %llx", + __entry->resets) + ); + +/* + * Trace point for a vcpu's stop requests. + */ +TRACE_EVENT(kvm_s390_stop_request, + TP_PROTO(unsigned int action_bits), + TP_ARGS(action_bits), + + TP_STRUCT__entry( + __field(unsigned int, action_bits) + ), + + TP_fast_assign( + __entry->action_bits = action_bits; + ), + + TP_printk("stop request, action_bits = %08x", + __entry->action_bits) + ); + + +#endif /* _TRACE_KVMS390_H */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> diff --git a/arch/s390/kvm/trace.h b/arch/s390/kvm/trace.h new file mode 100644 index 000000000000..2b29e62351d3 --- /dev/null +++ b/arch/s390/kvm/trace.h @@ -0,0 +1,341 @@ +#if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_KVM_H + +#include <linux/tracepoint.h> +#include <asm/sigp.h> +#include <asm/debug.h> + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM kvm +#define TRACE_INCLUDE_PATH . +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE trace + +/* + * Helpers for vcpu-specific tracepoints containing the same information + * as s390dbf VCPU_EVENTs. + */ +#define VCPU_PROTO_COMMON struct kvm_vcpu *vcpu +#define VCPU_ARGS_COMMON vcpu +#define VCPU_FIELD_COMMON __field(int, id) \ + __field(unsigned long, pswmask) \ + __field(unsigned long, pswaddr) +#define VCPU_ASSIGN_COMMON do { \ + __entry->id = vcpu->vcpu_id; \ + __entry->pswmask = vcpu->arch.sie_block->gpsw.mask; \ + __entry->pswaddr = vcpu->arch.sie_block->gpsw.addr; \ + } while (0); +#define VCPU_TP_PRINTK(p_str, p_args...) \ + TP_printk("%02d[%016lx-%016lx]: " p_str, __entry->id, \ + __entry->pswmask, __entry->pswaddr, p_args) + +/* + * Tracepoints for SIE entry and exit. + */ +TRACE_EVENT(kvm_s390_sie_enter, + TP_PROTO(VCPU_PROTO_COMMON, int cpuflags), + TP_ARGS(VCPU_ARGS_COMMON, cpuflags), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(int, cpuflags) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->cpuflags = cpuflags; + ), + + VCPU_TP_PRINTK("entering sie flags %x", __entry->cpuflags) + ); + +TRACE_EVENT(kvm_s390_sie_fault, + TP_PROTO(VCPU_PROTO_COMMON), + TP_ARGS(VCPU_ARGS_COMMON), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + ), + + VCPU_TP_PRINTK("%s", "fault in sie instruction") + ); + +#define sie_intercept_code \ + {0x04, "Instruction"}, \ + {0x08, "Program interruption"}, \ + {0x0C, "Instruction and program interuption"}, \ + {0x10, "External request"}, \ + {0x14, "External interruption"}, \ + {0x18, "I/O request"}, \ + {0x1C, "Wait state"}, \ + {0x20, "Validity"}, \ + {0x28, "Stop request"} + +TRACE_EVENT(kvm_s390_sie_exit, + TP_PROTO(VCPU_PROTO_COMMON, u8 icptcode), + TP_ARGS(VCPU_ARGS_COMMON, icptcode), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(u8, icptcode) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->icptcode = icptcode; + ), + + VCPU_TP_PRINTK("exit sie icptcode %d (%s)", __entry->icptcode, + __print_symbolic(__entry->icptcode, + sie_intercept_code)) + ); + +/* + * Trace point for intercepted instructions. + */ +TRACE_EVENT(kvm_s390_intercept_instruction, + TP_PROTO(VCPU_PROTO_COMMON, __u16 ipa, __u32 ipb), + TP_ARGS(VCPU_ARGS_COMMON, ipa, ipb), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(__u64, instruction) + __field(char, insn[8]) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->instruction = ((__u64)ipa << 48) | + ((__u64)ipb << 16); + ), + + VCPU_TP_PRINTK("intercepted instruction %016llx (%s)", + __entry->instruction, + insn_to_mnemonic((unsigned char *) + &__entry->instruction, + __entry->insn) ? + "unknown" : __entry->insn) + ); + +/* + * Trace point for intercepted program interruptions. + */ +TRACE_EVENT(kvm_s390_intercept_prog, + TP_PROTO(VCPU_PROTO_COMMON, __u16 code), + TP_ARGS(VCPU_ARGS_COMMON, code), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(__u16, code) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->code = code; + ), + + VCPU_TP_PRINTK("intercepted program interruption %04x", + __entry->code) + ); + +/* + * Trace point for validity intercepts. + */ +TRACE_EVENT(kvm_s390_intercept_validity, + TP_PROTO(VCPU_PROTO_COMMON, __u16 viwhy), + TP_ARGS(VCPU_ARGS_COMMON, viwhy), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(__u16, viwhy) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->viwhy = viwhy; + ), + + VCPU_TP_PRINTK("got validity intercept %04x", __entry->viwhy) + ); + +/* + * Trace points for instructions that are of special interest. + */ + +#define sigp_order_codes \ + {SIGP_SENSE, "sense"}, \ + {SIGP_EXTERNAL_CALL, "external call"}, \ + {SIGP_EMERGENCY_SIGNAL, "emergency signal"}, \ + {SIGP_STOP, "stop"}, \ + {SIGP_STOP_AND_STORE_STATUS, "stop and store status"}, \ + {SIGP_SET_ARCHITECTURE, "set architecture"}, \ + {SIGP_SET_PREFIX, "set prefix"}, \ + {SIGP_SENSE_RUNNING, "sense running"}, \ + {SIGP_RESTART, "restart"} + +TRACE_EVENT(kvm_s390_handle_sigp, + TP_PROTO(VCPU_PROTO_COMMON, __u8 order_code, __u16 cpu_addr, \ + __u32 parameter), + TP_ARGS(VCPU_ARGS_COMMON, order_code, cpu_addr, parameter), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(__u8, order_code) + __field(__u16, cpu_addr) + __field(__u32, parameter) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->order_code = order_code; + __entry->cpu_addr = cpu_addr; + __entry->parameter = parameter; + ), + + VCPU_TP_PRINTK("handle sigp order %02x (%s), cpu address %04x, " \ + "parameter %08x", __entry->order_code, + __print_symbolic(__entry->order_code, + sigp_order_codes), + __entry->cpu_addr, __entry->parameter) + ); + +#define diagnose_codes \ + {0x10, "release pages"}, \ + {0x44, "time slice end"}, \ + {0x308, "ipl functions"}, \ + {0x500, "kvm hypercall"}, \ + {0x501, "kvm breakpoint"} + +TRACE_EVENT(kvm_s390_handle_diag, + TP_PROTO(VCPU_PROTO_COMMON, __u16 code), + TP_ARGS(VCPU_ARGS_COMMON, code), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(__u16, code) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->code = code; + ), + + VCPU_TP_PRINTK("handle diagnose call %04x (%s)", __entry->code, + __print_symbolic(__entry->code, diagnose_codes)) + ); + +TRACE_EVENT(kvm_s390_handle_lctl, + TP_PROTO(VCPU_PROTO_COMMON, int g, int reg1, int reg3, u64 addr), + TP_ARGS(VCPU_ARGS_COMMON, g, reg1, reg3, addr), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(int, g) + __field(int, reg1) + __field(int, reg3) + __field(u64, addr) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->g = g; + __entry->reg1 = reg1; + __entry->reg3 = reg3; + __entry->addr = addr; + ), + + VCPU_TP_PRINTK("%s: loading cr %x-%x from %016llx", + __entry->g ? "lctlg" : "lctl", + __entry->reg1, __entry->reg3, __entry->addr) + ); + +TRACE_EVENT(kvm_s390_handle_prefix, + TP_PROTO(VCPU_PROTO_COMMON, int set, u32 address), + TP_ARGS(VCPU_ARGS_COMMON, set, address), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(int, set) + __field(u32, address) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->set = set; + __entry->address = address; + ), + + VCPU_TP_PRINTK("%s prefix to %08x", + __entry->set ? "setting" : "storing", + __entry->address) + ); + +TRACE_EVENT(kvm_s390_handle_stap, + TP_PROTO(VCPU_PROTO_COMMON, u64 address), + TP_ARGS(VCPU_ARGS_COMMON, address), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(u64, address) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->address = address; + ), + + VCPU_TP_PRINTK("storing cpu address to %016llx", + __entry->address) + ); + +TRACE_EVENT(kvm_s390_handle_stfl, + TP_PROTO(VCPU_PROTO_COMMON, unsigned int facility_list), + TP_ARGS(VCPU_ARGS_COMMON, facility_list), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(unsigned int, facility_list) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->facility_list = facility_list; + ), + + VCPU_TP_PRINTK("store facility list value %08x", + __entry->facility_list) + ); + +TRACE_EVENT(kvm_s390_handle_stsi, + TP_PROTO(VCPU_PROTO_COMMON, int fc, int sel1, int sel2, u64 addr), + TP_ARGS(VCPU_ARGS_COMMON, fc, sel1, sel2, addr), + + TP_STRUCT__entry( + VCPU_FIELD_COMMON + __field(int, fc) + __field(int, sel1) + __field(int, sel2) + __field(u64, addr) + ), + + TP_fast_assign( + VCPU_ASSIGN_COMMON + __entry->fc = fc; + __entry->sel1 = sel1; + __entry->sel2 = sel2; + __entry->addr = addr; + ), + + VCPU_TP_PRINTK("STSI %d.%d.%d information stored to %016llx", + __entry->fc, __entry->sel1, __entry->sel2, + __entry->addr) + ); + +#endif /* _TRACE_KVM_H */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 7f9a395c5254..b72777ff32a9 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -586,23 +586,18 @@ config PARAVIRT_TIME_ACCOUNTING source "arch/x86/xen/Kconfig" -config KVM_CLOCK - bool "KVM paravirtualized clock" - select PARAVIRT - select PARAVIRT_CLOCK - ---help--- - Turning on this option will allow you to run a paravirtualized clock - when running over the KVM hypervisor. Instead of relying on a PIT - (or probably other) emulation by the underlying device model, the host - provides the guest with timing infrastructure such as time of day, and - system time - config KVM_GUEST - bool "KVM Guest support" + bool "KVM Guest support (including kvmclock)" + select PARAVIRT select PARAVIRT + select PARAVIRT_CLOCK + default y if PARAVIRT_GUEST ---help--- This option enables various optimizations for running under the KVM - hypervisor. + hypervisor. It includes a paravirtualized clock, so that instead + of relying on a PIT (or probably other) emulation by the + underlying device model, the host provides the guest with + timing infrastructure such as time of day, and system time source "arch/x86/lguest/Kconfig" diff --git a/arch/x86/include/asm/kvm.h b/arch/x86/include/asm/kvm.h index 41e08cb6a092..a65ec29e6ffb 100644 --- a/arch/x86/include/asm/kvm.h +++ b/arch/x86/include/asm/kvm.h @@ -41,6 +41,7 @@ #define __KVM_HAVE_DEBUGREGS #define __KVM_HAVE_XSAVE #define __KVM_HAVE_XCRS +#define __KVM_HAVE_READONLY_MEM /* Architectural interrupt line count. */ #define KVM_NR_INTERRUPTS 256 diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h index c764f43b71c5..15f960c06ff7 100644 --- a/arch/x86/include/asm/kvm_emulate.h +++ b/arch/x86/include/asm/kvm_emulate.h @@ -86,6 +86,19 @@ struct x86_instruction_info { struct x86_emulate_ops { /* + * read_gpr: read a general purpose register (rax - r15) + * + * @reg: gpr number. + */ + ulong (*read_gpr)(struct x86_emulate_ctxt *ctxt, unsigned reg); + /* + * write_gpr: write a general purpose register (rax - r15) + * + * @reg: gpr number. + * @val: value to write. + */ + void (*write_gpr)(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val); + /* * read_std: Read bytes of standard (non-emulated/special) memory. * Used for descriptor reading. * @addr: [IN ] Linear address from which to read. @@ -200,8 +213,9 @@ typedef u32 __attribute__((vector_size(16))) sse128_t; /* Type, address-of, and value of an instruction's operand. */ struct operand { - enum { OP_REG, OP_MEM, OP_IMM, OP_XMM, OP_MM, OP_NONE } type; + enum { OP_REG, OP_MEM, OP_MEM_STR, OP_IMM, OP_XMM, OP_MM, OP_NONE } type; unsigned int bytes; + unsigned int count; union { unsigned long orig_val; u64 orig_val64; @@ -221,6 +235,7 @@ struct operand { char valptr[sizeof(unsigned long) + 2]; sse128_t vec_val; u64 mm_val; + void *data; }; }; @@ -236,14 +251,23 @@ struct read_cache { unsigned long end; }; +/* Execution mode, passed to the emulator. */ +enum x86emul_mode { + X86EMUL_MODE_REAL, /* Real mode. */ + X86EMUL_MODE_VM86, /* Virtual 8086 mode. */ + X86EMUL_MODE_PROT16, /* 16-bit protected mode. */ + X86EMUL_MODE_PROT32, /* 32-bit protected mode. */ + X86EMUL_MODE_PROT64, /* 64-bit (long) mode. */ +}; + struct x86_emulate_ctxt { - struct x86_emulate_ops *ops; + const struct x86_emulate_ops *ops; /* Register state before/after emulation. */ unsigned long eflags; unsigned long eip; /* eip before instruction emulation */ /* Emulated execution mode, represented by an X86EMUL_MODE value. */ - int mode; + enum x86emul_mode mode; /* interruptibility state, as a result of execution of STI or MOV SS */ int interruptibility; @@ -281,8 +305,10 @@ struct x86_emulate_ctxt { bool rip_relative; unsigned long _eip; struct operand memop; + u32 regs_valid; /* bitmaps of registers in _regs[] that can be read */ + u32 regs_dirty; /* bitmaps of registers in _regs[] that have been written */ /* Fields above regs are cleared together. */ - unsigned long regs[NR_VCPU_REGS]; + unsigned long _regs[NR_VCPU_REGS]; struct operand *memopp; struct fetch_cache fetch; struct read_cache io_read; @@ -293,17 +319,6 @@ struct x86_emulate_ctxt { #define REPE_PREFIX 0xf3 #define REPNE_PREFIX 0xf2 -/* Execution mode, passed to the emulator. */ -#define X86EMUL_MODE_REAL 0 /* Real mode. */ -#define X86EMUL_MODE_VM86 1 /* Virtual 8086 mode. */ -#define X86EMUL_MODE_PROT16 2 /* 16-bit protected mode. */ -#define X86EMUL_MODE_PROT32 4 /* 32-bit protected mode. */ -#define X86EMUL_MODE_PROT64 8 /* 64-bit (long) mode. */ - -/* any protected mode */ -#define X86EMUL_MODE_PROT (X86EMUL_MODE_PROT16|X86EMUL_MODE_PROT32| \ - X86EMUL_MODE_PROT64) - /* CPUID vendors */ #define X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx 0x68747541 #define X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx 0x444d4163 @@ -394,4 +409,7 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt, u16 tss_selector, int idt_index, int reason, bool has_error_code, u32 error_code); int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq); +void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt); +void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt); + #endif /* _ASM_X86_KVM_X86_EMULATE_H */ diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 1eaa6b056670..b2e11f452435 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -271,10 +271,24 @@ struct kvm_mmu { union kvm_mmu_page_role base_role; bool direct_map; + /* + * Bitmap; bit set = permission fault + * Byte index: page fault error code [4:1] + * Bit index: pte permissions in ACC_* format + */ + u8 permissions[16]; + u64 *pae_root; u64 *lm_root; u64 rsvd_bits_mask[2][4]; + /* + * Bitmap: bit set = last pte in walk + * index[0:1]: level (zero-based) + * index[2]: pte.ps + */ + u8 last_pte_bitmap; + bool nx; u64 pdptrs[4]; /* pae */ @@ -398,12 +412,15 @@ struct kvm_vcpu_arch { struct x86_emulate_ctxt emulate_ctxt; bool emulate_regs_need_sync_to_vcpu; bool emulate_regs_need_sync_from_vcpu; + int (*complete_userspace_io)(struct kvm_vcpu *vcpu); gpa_t time; struct pvclock_vcpu_time_info hv_clock; unsigned int hw_tsc_khz; unsigned int time_offset; struct page *time_page; + /* set guest stopped flag in pvclock flags field */ + bool pvclock_set_guest_stopped_request; struct { u64 msr_val; @@ -438,6 +455,7 @@ struct kvm_vcpu_arch { unsigned long dr6; unsigned long dr7; unsigned long eff_db[KVM_NR_DB_REGS]; + unsigned long guest_debug_dr7; u64 mcg_cap; u64 mcg_status; @@ -484,14 +502,24 @@ struct kvm_vcpu_arch { }; struct kvm_lpage_info { - unsigned long rmap_pde; int write_count; }; struct kvm_arch_memory_slot { + unsigned long *rmap[KVM_NR_PAGE_SIZES]; struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1]; }; +struct kvm_apic_map { + struct rcu_head rcu; + u8 ldr_bits; + /* fields bellow are used to decode ldr values in different modes */ + u32 cid_shift, cid_mask, lid_mask; + struct kvm_lapic *phys_map[256]; + /* first index is cluster id second is cpu id in a cluster */ + struct kvm_lapic *logical_map[16][16]; +}; + struct kvm_arch { unsigned int n_used_mmu_pages; unsigned int n_requested_mmu_pages; @@ -509,6 +537,8 @@ struct kvm_arch { struct kvm_ioapic *vioapic; struct kvm_pit *vpit; int vapics_in_nmi_mode; + struct mutex apic_map_lock; + struct kvm_apic_map *apic_map; unsigned int tss_addr; struct page *apic_access_page; @@ -602,8 +632,7 @@ struct kvm_x86_ops { void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu); void (*vcpu_put)(struct kvm_vcpu *vcpu); - void (*set_guest_debug)(struct kvm_vcpu *vcpu, - struct kvm_guest_debug *dbg); + void (*update_db_bp_intercept)(struct kvm_vcpu *vcpu); int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata); int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data); u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg); @@ -941,6 +970,7 @@ extern bool kvm_rebooting; #define KVM_ARCH_WANT_MMU_NOTIFIER int kvm_unmap_hva(struct kvm *kvm, unsigned long hva); +int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end); int kvm_age_hva(struct kvm *kvm, unsigned long hva); int kvm_test_age_hva(struct kvm *kvm, unsigned long hva); void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte); diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h index 2f7712e08b1e..eb3e9d85e1f1 100644 --- a/arch/x86/include/asm/kvm_para.h +++ b/arch/x86/include/asm/kvm_para.h @@ -102,21 +102,21 @@ struct kvm_vcpu_pv_apf_data { extern void kvmclock_init(void); extern int kvm_register_clock(char *txt); -#ifdef CONFIG_KVM_CLOCK +#ifdef CONFIG_KVM_GUEST bool kvm_check_and_clear_guest_paused(void); #else static inline bool kvm_check_and_clear_guest_paused(void) { return false; } -#endif /* CONFIG_KVMCLOCK */ +#endif /* CONFIG_KVM_GUEST */ /* This instruction is vmcall. On non-VT architectures, it will generate a * trap that we will then rewrite to the appropriate instruction. */ #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1" -/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun +/* For KVM hypercalls, a three-byte sequence of either the vmcall or the vmmcall * instruction. The hypervisor may replace it with something else but only the * instructions are guaranteed to be supported. * diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 8d7a619718b5..a48ea05157d3 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -81,8 +81,7 @@ obj-$(CONFIG_DEBUG_RODATA_TEST) += test_rodata.o obj-$(CONFIG_DEBUG_NX_TEST) += test_nx.o obj-$(CONFIG_DEBUG_NMI_SELFTEST) += nmi_selftest.o -obj-$(CONFIG_KVM_GUEST) += kvm.o -obj-$(CONFIG_KVM_CLOCK) += kvmclock.o +obj-$(CONFIG_KVM_GUEST) += kvm.o kvmclock.o obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_$(BITS).o obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= paravirt-spinlocks.o obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index c1d61ee4b4f1..b3e5e51bc907 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -354,6 +354,7 @@ static void kvm_pv_guest_cpu_reboot(void *unused) if (kvm_para_has_feature(KVM_FEATURE_PV_EOI)) wrmsrl(MSR_KVM_PV_EOI_EN, 0); kvm_pv_disable_apf(); + kvm_disable_steal_time(); } static int kvm_pv_reboot_notify(struct notifier_block *nb, @@ -396,9 +397,7 @@ void kvm_disable_steal_time(void) #ifdef CONFIG_SMP static void __init kvm_smp_prepare_boot_cpu(void) { -#ifdef CONFIG_KVM_CLOCK WARN_ON(kvm_register_clock("primary cpu clock")); -#endif kvm_guest_cpu_init(); native_smp_prepare_boot_cpu(); } diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 4f165479c453..d609be046b57 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -957,7 +957,7 @@ void __init setup_arch(char **cmdline_p) initmem_init(); memblock_find_dma_reserve(); -#ifdef CONFIG_KVM_CLOCK +#ifdef CONFIG_KVM_GUEST kvmclock_init(); #endif diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index a28f338843ea..586f00059805 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -20,6 +20,7 @@ if VIRTUALIZATION config KVM tristate "Kernel-based Virtual Machine (KVM) support" depends on HAVE_KVM + depends on HIGH_RES_TIMERS # for device assignment: depends on PCI # for TASKSTATS/TASK_DELAY_ACCT: @@ -37,6 +38,7 @@ config KVM select TASK_DELAY_ACCT select PERF_EVENTS select HAVE_KVM_MSI + select HAVE_KVM_CPU_RELAX_INTERCEPT ---help--- Support hosting fully virtualized guest machines using hardware virtualization extensions. You will need a fairly recent diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile index 4f579e8dcacf..04d30401c5cb 100644 --- a/arch/x86/kvm/Makefile +++ b/arch/x86/kvm/Makefile @@ -12,7 +12,7 @@ kvm-$(CONFIG_IOMMU_API) += $(addprefix ../../../virt/kvm/, iommu.o) kvm-$(CONFIG_KVM_ASYNC_PF) += $(addprefix ../../../virt/kvm/, async_pf.o) kvm-y += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \ - i8254.o timer.o cpuid.o pmu.o + i8254.o cpuid.o pmu.o kvm-intel-y += vmx.o kvm-amd-y += svm.o diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 0595f1397b7c..ec79e773342e 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -316,7 +316,7 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, } case 7: { entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; - /* Mask ebx against host capbability word 9 */ + /* Mask ebx against host capability word 9 */ if (index == 0) { entry->ebx &= kvm_supported_word9_x86_features; cpuid_mask(&entry->ebx, 9); @@ -397,8 +397,8 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, break; } case KVM_CPUID_SIGNATURE: { - char signature[12] = "KVMKVMKVM\0\0"; - u32 *sigptr = (u32 *)signature; + static const char signature[12] = "KVMKVMKVM\0\0"; + const u32 *sigptr = (const u32 *)signature; entry->eax = KVM_CPUID_FEATURES; entry->ebx = sigptr[0]; entry->ecx = sigptr[1]; @@ -484,10 +484,10 @@ struct kvm_cpuid_param { u32 func; u32 idx; bool has_leaf_count; - bool (*qualifier)(struct kvm_cpuid_param *param); + bool (*qualifier)(const struct kvm_cpuid_param *param); }; -static bool is_centaur_cpu(struct kvm_cpuid_param *param) +static bool is_centaur_cpu(const struct kvm_cpuid_param *param) { return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; } @@ -498,7 +498,7 @@ int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid, struct kvm_cpuid_entry2 *cpuid_entries; int limit, nent = 0, r = -E2BIG, i; u32 func; - static struct kvm_cpuid_param param[] = { + static const struct kvm_cpuid_param param[] = { { .func = 0, .has_leaf_count = true }, { .func = 0x80000000, .has_leaf_count = true }, { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true }, @@ -517,7 +517,7 @@ int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid, r = 0; for (i = 0; i < ARRAY_SIZE(param); i++) { - struct kvm_cpuid_param *ent = ¶m[i]; + const struct kvm_cpuid_param *ent = ¶m[i]; if (ent->qualifier && !ent->qualifier(ent)) continue; diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index a3b57a27be88..39171cb307ea 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -161,9 +161,9 @@ struct opcode { u64 intercept : 8; union { int (*execute)(struct x86_emulate_ctxt *ctxt); - struct opcode *group; - struct group_dual *gdual; - struct gprefix *gprefix; + const struct opcode *group; + const struct group_dual *gdual; + const struct gprefix *gprefix; } u; int (*check_perm)(struct x86_emulate_ctxt *ctxt); }; @@ -202,6 +202,42 @@ struct gprefix { #define EFLG_RESERVED_ZEROS_MASK 0xffc0802a #define EFLG_RESERVED_ONE_MASK 2 +static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr) +{ + if (!(ctxt->regs_valid & (1 << nr))) { + ctxt->regs_valid |= 1 << nr; + ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr); + } + return ctxt->_regs[nr]; +} + +static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr) +{ + ctxt->regs_valid |= 1 << nr; + ctxt->regs_dirty |= 1 << nr; + return &ctxt->_regs[nr]; +} + +static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr) +{ + reg_read(ctxt, nr); + return reg_write(ctxt, nr); +} + +static void writeback_registers(struct x86_emulate_ctxt *ctxt) +{ + unsigned reg; + + for_each_set_bit(reg, (ulong *)&ctxt->regs_dirty, 16) + ctxt->ops->write_gpr(ctxt, reg, ctxt->_regs[reg]); +} + +static void invalidate_registers(struct x86_emulate_ctxt *ctxt) +{ + ctxt->regs_dirty = 0; + ctxt->regs_valid = 0; +} + /* * Instruction emulation: * Most instructions are emulated directly via a fragment of inline assembly @@ -374,8 +410,8 @@ struct gprefix { #define __emulate_1op_rax_rdx(ctxt, _op, _suffix, _ex) \ do { \ unsigned long _tmp; \ - ulong *rax = &(ctxt)->regs[VCPU_REGS_RAX]; \ - ulong *rdx = &(ctxt)->regs[VCPU_REGS_RDX]; \ + ulong *rax = reg_rmw((ctxt), VCPU_REGS_RAX); \ + ulong *rdx = reg_rmw((ctxt), VCPU_REGS_RDX); \ \ __asm__ __volatile__ ( \ _PRE_EFLAGS("0", "5", "1") \ @@ -494,7 +530,7 @@ register_address_increment(struct x86_emulate_ctxt *ctxt, unsigned long *reg, in static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc) { - masked_increment(&ctxt->regs[VCPU_REGS_RSP], stack_mask(ctxt), inc); + masked_increment(reg_rmw(ctxt, VCPU_REGS_RSP), stack_mask(ctxt), inc); } static inline void jmp_rel(struct x86_emulate_ctxt *ctxt, int rel) @@ -632,8 +668,6 @@ static int __linearize(struct x86_emulate_ctxt *ctxt, la = seg_base(ctxt, addr.seg) + addr.ea; switch (ctxt->mode) { - case X86EMUL_MODE_REAL: - break; case X86EMUL_MODE_PROT64: if (((signed long)la << 16) >> 16 != la) return emulate_gp(ctxt, 0); @@ -655,7 +689,7 @@ static int __linearize(struct x86_emulate_ctxt *ctxt, if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim) goto bad; } else { - /* exapand-down segment */ + /* expand-down segment */ if (addr.ea <= lim || (u32)(addr.ea + size - 1) <= lim) goto bad; lim = desc.d ? 0xffffffff : 0xffff; @@ -663,7 +697,10 @@ static int __linearize(struct x86_emulate_ctxt *ctxt, goto bad; } cpl = ctxt->ops->cpl(ctxt); - rpl = sel & 3; + if (ctxt->mode == X86EMUL_MODE_REAL) + rpl = 0; + else + rpl = sel & 3; cpl = max(cpl, rpl); if (!(desc.type & 8)) { /* data segment */ @@ -688,9 +725,9 @@ static int __linearize(struct x86_emulate_ctxt *ctxt, return X86EMUL_CONTINUE; bad: if (addr.seg == VCPU_SREG_SS) - return emulate_ss(ctxt, addr.seg); + return emulate_ss(ctxt, sel); else - return emulate_gp(ctxt, addr.seg); + return emulate_gp(ctxt, sel); } static int linearize(struct x86_emulate_ctxt *ctxt, @@ -786,14 +823,15 @@ static int do_insn_fetch(struct x86_emulate_ctxt *ctxt, * pointer into the block that addresses the relevant register. * @highbyte_regs specifies whether to decode AH,CH,DH,BH. */ -static void *decode_register(u8 modrm_reg, unsigned long *regs, +static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg, int highbyte_regs) { void *p; - p = ®s[modrm_reg]; if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8) - p = (unsigned char *)®s[modrm_reg & 3] + 1; + p = (unsigned char *)reg_rmw(ctxt, modrm_reg & 3) + 1; + else + p = reg_rmw(ctxt, modrm_reg); return p; } @@ -871,23 +909,23 @@ static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg) { ctxt->ops->get_fpu(ctxt); switch (reg) { - case 0: asm("movdqu %%xmm0, %0" : "=m"(*data)); break; - case 1: asm("movdqu %%xmm1, %0" : "=m"(*data)); break; - case 2: asm("movdqu %%xmm2, %0" : "=m"(*data)); break; - case 3: asm("movdqu %%xmm3, %0" : "=m"(*data)); break; - case 4: asm("movdqu %%xmm4, %0" : "=m"(*data)); break; - case 5: asm("movdqu %%xmm5, %0" : "=m"(*data)); break; - case 6: asm("movdqu %%xmm6, %0" : "=m"(*data)); break; - case 7: asm("movdqu %%xmm7, %0" : "=m"(*data)); break; + case 0: asm("movdqa %%xmm0, %0" : "=m"(*data)); break; + case 1: asm("movdqa %%xmm1, %0" : "=m"(*data)); break; + case 2: asm("movdqa %%xmm2, %0" : "=m"(*data)); break; + case 3: asm("movdqa %%xmm3, %0" : "=m"(*data)); break; + case 4: asm("movdqa %%xmm4, %0" : "=m"(*data)); break; + case 5: asm("movdqa %%xmm5, %0" : "=m"(*data)); break; + case 6: asm("movdqa %%xmm6, %0" : "=m"(*data)); break; + case 7: asm("movdqa %%xmm7, %0" : "=m"(*data)); break; #ifdef CONFIG_X86_64 - case 8: asm("movdqu %%xmm8, %0" : "=m"(*data)); break; - case 9: asm("movdqu %%xmm9, %0" : "=m"(*data)); break; - case 10: asm("movdqu %%xmm10, %0" : "=m"(*data)); break; - case 11: asm("movdqu %%xmm11, %0" : "=m"(*data)); break; - case 12: asm("movdqu %%xmm12, %0" : "=m"(*data)); break; - case 13: asm("movdqu %%xmm13, %0" : "=m"(*data)); break; - case 14: asm("movdqu %%xmm14, %0" : "=m"(*data)); break; - case 15: asm("movdqu %%xmm15, %0" : "=m"(*data)); break; + case 8: asm("movdqa %%xmm8, %0" : "=m"(*data)); break; + case 9: asm("movdqa %%xmm9, %0" : "=m"(*data)); break; + case 10: asm("movdqa %%xmm10, %0" : "=m"(*data)); break; + case 11: asm("movdqa %%xmm11, %0" : "=m"(*data)); break; + case 12: asm("movdqa %%xmm12, %0" : "=m"(*data)); break; + case 13: asm("movdqa %%xmm13, %0" : "=m"(*data)); break; + case 14: asm("movdqa %%xmm14, %0" : "=m"(*data)); break; + case 15: asm("movdqa %%xmm15, %0" : "=m"(*data)); break; #endif default: BUG(); } @@ -899,23 +937,23 @@ static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, { ctxt->ops->get_fpu(ctxt); switch (reg) { - case 0: asm("movdqu %0, %%xmm0" : : "m"(*data)); break; - case 1: asm("movdqu %0, %%xmm1" : : "m"(*data)); break; - case 2: asm("movdqu %0, %%xmm2" : : "m"(*data)); break; - case 3: asm("movdqu %0, %%xmm3" : : "m"(*data)); break; - case 4: asm("movdqu %0, %%xmm4" : : "m"(*data)); break; - case 5: asm("movdqu %0, %%xmm5" : : "m"(*data)); break; - case 6: asm("movdqu %0, %%xmm6" : : "m"(*data)); break; - case 7: asm("movdqu %0, %%xmm7" : : "m"(*data)); break; + case 0: asm("movdqa %0, %%xmm0" : : "m"(*data)); break; + case 1: asm("movdqa %0, %%xmm1" : : "m"(*data)); break; + case 2: asm("movdqa %0, %%xmm2" : : "m"(*data)); break; + case 3: asm("movdqa %0, %%xmm3" : : "m"(*data)); break; + case 4: asm("movdqa %0, %%xmm4" : : "m"(*data)); break; + case 5: asm("movdqa %0, %%xmm5" : : "m"(*data)); break; + case 6: asm("movdqa %0, %%xmm6" : : "m"(*data)); break; + case 7: asm("movdqa %0, %%xmm7" : : "m"(*data)); break; #ifdef CONFIG_X86_64 - case 8: asm("movdqu %0, %%xmm8" : : "m"(*data)); break; - case 9: asm("movdqu %0, %%xmm9" : : "m"(*data)); break; - case 10: asm("movdqu %0, %%xmm10" : : "m"(*data)); break; - case 11: asm("movdqu %0, %%xmm11" : : "m"(*data)); break; - case 12: asm("movdqu %0, %%xmm12" : : "m"(*data)); break; - case 13: asm("movdqu %0, %%xmm13" : : "m"(*data)); break; - case 14: asm("movdqu %0, %%xmm14" : : "m"(*data)); break; - case 15: asm("movdqu %0, %%xmm15" : : "m"(*data)); break; + case 8: asm("movdqa %0, %%xmm8" : : "m"(*data)); break; + case 9: asm("movdqa %0, %%xmm9" : : "m"(*data)); break; + case 10: asm("movdqa %0, %%xmm10" : : "m"(*data)); break; + case 11: asm("movdqa %0, %%xmm11" : : "m"(*data)); break; + case 12: asm("movdqa %0, %%xmm12" : : "m"(*data)); break; + case 13: asm("movdqa %0, %%xmm13" : : "m"(*data)); break; + case 14: asm("movdqa %0, %%xmm14" : : "m"(*data)); break; + case 15: asm("movdqa %0, %%xmm15" : : "m"(*data)); break; #endif default: BUG(); } @@ -982,10 +1020,10 @@ static void decode_register_operand(struct x86_emulate_ctxt *ctxt, op->type = OP_REG; if (ctxt->d & ByteOp) { - op->addr.reg = decode_register(reg, ctxt->regs, highbyte_regs); + op->addr.reg = decode_register(ctxt, reg, highbyte_regs); op->bytes = 1; } else { - op->addr.reg = decode_register(reg, ctxt->regs, 0); + op->addr.reg = decode_register(ctxt, reg, 0); op->bytes = ctxt->op_bytes; } fetch_register_operand(op); @@ -1020,8 +1058,7 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt, if (ctxt->modrm_mod == 3) { op->type = OP_REG; op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; - op->addr.reg = decode_register(ctxt->modrm_rm, - ctxt->regs, ctxt->d & ByteOp); + op->addr.reg = decode_register(ctxt, ctxt->modrm_rm, ctxt->d & ByteOp); if (ctxt->d & Sse) { op->type = OP_XMM; op->bytes = 16; @@ -1042,10 +1079,10 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt, op->type = OP_MEM; if (ctxt->ad_bytes == 2) { - unsigned bx = ctxt->regs[VCPU_REGS_RBX]; - unsigned bp = ctxt->regs[VCPU_REGS_RBP]; - unsigned si = ctxt->regs[VCPU_REGS_RSI]; - unsigned di = ctxt->regs[VCPU_REGS_RDI]; + unsigned bx = reg_read(ctxt, VCPU_REGS_RBX); + unsigned bp = reg_read(ctxt, VCPU_REGS_RBP); + unsigned si = reg_read(ctxt, VCPU_REGS_RSI); + unsigned di = reg_read(ctxt, VCPU_REGS_RDI); /* 16-bit ModR/M decode. */ switch (ctxt->modrm_mod) { @@ -1102,17 +1139,17 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt, if ((base_reg & 7) == 5 && ctxt->modrm_mod == 0) modrm_ea += insn_fetch(s32, ctxt); else { - modrm_ea += ctxt->regs[base_reg]; + modrm_ea += reg_read(ctxt, base_reg); adjust_modrm_seg(ctxt, base_reg); } if (index_reg != 4) - modrm_ea += ctxt->regs[index_reg] << scale; + modrm_ea += reg_read(ctxt, index_reg) << scale; } else if ((ctxt->modrm_rm & 7) == 5 && ctxt->modrm_mod == 0) { if (ctxt->mode == X86EMUL_MODE_PROT64) ctxt->rip_relative = 1; } else { base_reg = ctxt->modrm_rm; - modrm_ea += ctxt->regs[base_reg]; + modrm_ea += reg_read(ctxt, base_reg); adjust_modrm_seg(ctxt, base_reg); } switch (ctxt->modrm_mod) { @@ -1179,24 +1216,21 @@ static int read_emulated(struct x86_emulate_ctxt *ctxt, int rc; struct read_cache *mc = &ctxt->mem_read; - while (size) { - int n = min(size, 8u); - size -= n; - if (mc->pos < mc->end) - goto read_cached; + if (mc->pos < mc->end) + goto read_cached; - rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, n, - &ctxt->exception); - if (rc != X86EMUL_CONTINUE) - return rc; - mc->end += n; + WARN_ON((mc->end + size) >= sizeof(mc->data)); - read_cached: - memcpy(dest, mc->data + mc->pos, n); - mc->pos += n; - dest += n; - addr += n; - } + rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size, + &ctxt->exception); + if (rc != X86EMUL_CONTINUE) + return rc; + + mc->end += size; + +read_cached: + memcpy(dest, mc->data + mc->pos, size); + mc->pos += size; return X86EMUL_CONTINUE; } @@ -1253,10 +1287,10 @@ static int pio_in_emulated(struct x86_emulate_ctxt *ctxt, if (rc->pos == rc->end) { /* refill pio read ahead */ unsigned int in_page, n; unsigned int count = ctxt->rep_prefix ? - address_mask(ctxt, ctxt->regs[VCPU_REGS_RCX]) : 1; + address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) : 1; in_page = (ctxt->eflags & EFLG_DF) ? - offset_in_page(ctxt->regs[VCPU_REGS_RDI]) : - PAGE_SIZE - offset_in_page(ctxt->regs[VCPU_REGS_RDI]); + offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)) : + PAGE_SIZE - offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)); n = min(min(in_page, (unsigned int)sizeof(rc->data)) / size, count); if (n == 0) @@ -1267,8 +1301,15 @@ static int pio_in_emulated(struct x86_emulate_ctxt *ctxt, rc->end = n * size; } - memcpy(dest, rc->data + rc->pos, size); - rc->pos += size; + if (ctxt->rep_prefix && !(ctxt->eflags & EFLG_DF)) { + ctxt->dst.data = rc->data + rc->pos; + ctxt->dst.type = OP_MEM_STR; + ctxt->dst.count = (rc->end - rc->pos) / size; + rc->pos = rc->end; + } else { + memcpy(dest, rc->data + rc->pos, size); + rc->pos += size; + } return 1; } @@ -1291,7 +1332,7 @@ static int read_interrupt_descriptor(struct x86_emulate_ctxt *ctxt, static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt, u16 selector, struct desc_ptr *dt) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; if (selector & 1 << 2) { struct desc_struct desc; @@ -1355,19 +1396,15 @@ static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */ ulong desc_addr; int ret; + u16 dummy; memset(&seg_desc, 0, sizeof seg_desc); if ((seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86) || ctxt->mode == X86EMUL_MODE_REAL) { /* set real mode segment descriptor */ + ctxt->ops->get_segment(ctxt, &dummy, &seg_desc, NULL, seg); set_desc_base(&seg_desc, selector << 4); - set_desc_limit(&seg_desc, 0xffff); - seg_desc.type = 3; - seg_desc.p = 1; - seg_desc.s = 1; - if (ctxt->mode == X86EMUL_MODE_VM86) - seg_desc.dpl = 3; goto load; } @@ -1396,7 +1433,7 @@ static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, err_code = selector & 0xfffc; err_vec = GP_VECTOR; - /* can't load system descriptor into segment selecor */ + /* can't load system descriptor into segment selector */ if (seg <= VCPU_SREG_GS && !seg_desc.s) goto exception; @@ -1516,6 +1553,14 @@ static int writeback(struct x86_emulate_ctxt *ctxt) if (rc != X86EMUL_CONTINUE) return rc; break; + case OP_MEM_STR: + rc = segmented_write(ctxt, + ctxt->dst.addr.mem, + ctxt->dst.data, + ctxt->dst.bytes * ctxt->dst.count); + if (rc != X86EMUL_CONTINUE) + return rc; + break; case OP_XMM: write_sse_reg(ctxt, &ctxt->dst.vec_val, ctxt->dst.addr.xmm); break; @@ -1536,7 +1581,7 @@ static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes) struct segmented_address addr; rsp_increment(ctxt, -bytes); - addr.ea = ctxt->regs[VCPU_REGS_RSP] & stack_mask(ctxt); + addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); addr.seg = VCPU_SREG_SS; return segmented_write(ctxt, addr, data, bytes); @@ -1555,7 +1600,7 @@ static int emulate_pop(struct x86_emulate_ctxt *ctxt, int rc; struct segmented_address addr; - addr.ea = ctxt->regs[VCPU_REGS_RSP] & stack_mask(ctxt); + addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt); addr.seg = VCPU_SREG_SS; rc = segmented_read(ctxt, addr, dest, len); if (rc != X86EMUL_CONTINUE) @@ -1623,26 +1668,28 @@ static int em_enter(struct x86_emulate_ctxt *ctxt) int rc; unsigned frame_size = ctxt->src.val; unsigned nesting_level = ctxt->src2.val & 31; + ulong rbp; if (nesting_level) return X86EMUL_UNHANDLEABLE; - rc = push(ctxt, &ctxt->regs[VCPU_REGS_RBP], stack_size(ctxt)); + rbp = reg_read(ctxt, VCPU_REGS_RBP); + rc = push(ctxt, &rbp, stack_size(ctxt)); if (rc != X86EMUL_CONTINUE) return rc; - assign_masked(&ctxt->regs[VCPU_REGS_RBP], ctxt->regs[VCPU_REGS_RSP], + assign_masked(reg_rmw(ctxt, VCPU_REGS_RBP), reg_read(ctxt, VCPU_REGS_RSP), stack_mask(ctxt)); - assign_masked(&ctxt->regs[VCPU_REGS_RSP], - ctxt->regs[VCPU_REGS_RSP] - frame_size, + assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), + reg_read(ctxt, VCPU_REGS_RSP) - frame_size, stack_mask(ctxt)); return X86EMUL_CONTINUE; } static int em_leave(struct x86_emulate_ctxt *ctxt) { - assign_masked(&ctxt->regs[VCPU_REGS_RSP], ctxt->regs[VCPU_REGS_RBP], + assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), reg_read(ctxt, VCPU_REGS_RBP), stack_mask(ctxt)); - return emulate_pop(ctxt, &ctxt->regs[VCPU_REGS_RBP], ctxt->op_bytes); + return emulate_pop(ctxt, reg_rmw(ctxt, VCPU_REGS_RBP), ctxt->op_bytes); } static int em_push_sreg(struct x86_emulate_ctxt *ctxt) @@ -1670,13 +1717,13 @@ static int em_pop_sreg(struct x86_emulate_ctxt *ctxt) static int em_pusha(struct x86_emulate_ctxt *ctxt) { - unsigned long old_esp = ctxt->regs[VCPU_REGS_RSP]; + unsigned long old_esp = reg_read(ctxt, VCPU_REGS_RSP); int rc = X86EMUL_CONTINUE; int reg = VCPU_REGS_RAX; while (reg <= VCPU_REGS_RDI) { (reg == VCPU_REGS_RSP) ? - (ctxt->src.val = old_esp) : (ctxt->src.val = ctxt->regs[reg]); + (ctxt->src.val = old_esp) : (ctxt->src.val = reg_read(ctxt, reg)); rc = em_push(ctxt); if (rc != X86EMUL_CONTINUE) @@ -1705,7 +1752,7 @@ static int em_popa(struct x86_emulate_ctxt *ctxt) --reg; } - rc = emulate_pop(ctxt, &ctxt->regs[reg], ctxt->op_bytes); + rc = emulate_pop(ctxt, reg_rmw(ctxt, reg), ctxt->op_bytes); if (rc != X86EMUL_CONTINUE) break; --reg; @@ -1713,9 +1760,9 @@ static int em_popa(struct x86_emulate_ctxt *ctxt) return rc; } -int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) +static int __emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; int rc; struct desc_ptr dt; gva_t cs_addr; @@ -1762,11 +1809,22 @@ int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) return rc; } +int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq) +{ + int rc; + + invalidate_registers(ctxt); + rc = __emulate_int_real(ctxt, irq); + if (rc == X86EMUL_CONTINUE) + writeback_registers(ctxt); + return rc; +} + static int emulate_int(struct x86_emulate_ctxt *ctxt, int irq) { switch(ctxt->mode) { case X86EMUL_MODE_REAL: - return emulate_int_real(ctxt, irq); + return __emulate_int_real(ctxt, irq); case X86EMUL_MODE_VM86: case X86EMUL_MODE_PROT16: case X86EMUL_MODE_PROT32: @@ -1973,14 +2031,14 @@ static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt) { u64 old = ctxt->dst.orig_val64; - if (((u32) (old >> 0) != (u32) ctxt->regs[VCPU_REGS_RAX]) || - ((u32) (old >> 32) != (u32) ctxt->regs[VCPU_REGS_RDX])) { - ctxt->regs[VCPU_REGS_RAX] = (u32) (old >> 0); - ctxt->regs[VCPU_REGS_RDX] = (u32) (old >> 32); + if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) || + ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) { + *reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0); + *reg_write(ctxt, VCPU_REGS_RDX) = (u32) (old >> 32); ctxt->eflags &= ~EFLG_ZF; } else { - ctxt->dst.val64 = ((u64)ctxt->regs[VCPU_REGS_RCX] << 32) | - (u32) ctxt->regs[VCPU_REGS_RBX]; + ctxt->dst.val64 = ((u64)reg_read(ctxt, VCPU_REGS_RCX) << 32) | + (u32) reg_read(ctxt, VCPU_REGS_RBX); ctxt->eflags |= EFLG_ZF; } @@ -2016,7 +2074,7 @@ static int em_cmpxchg(struct x86_emulate_ctxt *ctxt) { /* Save real source value, then compare EAX against destination. */ ctxt->src.orig_val = ctxt->src.val; - ctxt->src.val = ctxt->regs[VCPU_REGS_RAX]; + ctxt->src.val = reg_read(ctxt, VCPU_REGS_RAX); emulate_2op_SrcV(ctxt, "cmp"); if (ctxt->eflags & EFLG_ZF) { @@ -2025,7 +2083,7 @@ static int em_cmpxchg(struct x86_emulate_ctxt *ctxt) } else { /* Failure: write the value we saw to EAX. */ ctxt->dst.type = OP_REG; - ctxt->dst.addr.reg = (unsigned long *)&ctxt->regs[VCPU_REGS_RAX]; + ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); } return X86EMUL_CONTINUE; } @@ -2050,12 +2108,6 @@ static void setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, struct desc_struct *cs, struct desc_struct *ss) { - u16 selector; - - memset(cs, 0, sizeof(struct desc_struct)); - ctxt->ops->get_segment(ctxt, &selector, cs, NULL, VCPU_SREG_CS); - memset(ss, 0, sizeof(struct desc_struct)); - cs->l = 0; /* will be adjusted later */ set_desc_base(cs, 0); /* flat segment */ cs->g = 1; /* 4kb granularity */ @@ -2065,6 +2117,7 @@ setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, cs->dpl = 0; /* will be adjusted later */ cs->p = 1; cs->d = 1; + cs->avl = 0; set_desc_base(ss, 0); /* flat segment */ set_desc_limit(ss, 0xfffff); /* 4GB limit */ @@ -2074,6 +2127,8 @@ setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, ss->d = 1; /* 32bit stack segment */ ss->dpl = 0; ss->p = 1; + ss->l = 0; + ss->avl = 0; } static bool vendor_intel(struct x86_emulate_ctxt *ctxt) @@ -2089,7 +2144,7 @@ static bool vendor_intel(struct x86_emulate_ctxt *ctxt) static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; u32 eax, ebx, ecx, edx; /* @@ -2133,7 +2188,7 @@ static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt) static int em_syscall(struct x86_emulate_ctxt *ctxt) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; struct desc_struct cs, ss; u64 msr_data; u16 cs_sel, ss_sel; @@ -2165,10 +2220,10 @@ static int em_syscall(struct x86_emulate_ctxt *ctxt) ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); - ctxt->regs[VCPU_REGS_RCX] = ctxt->_eip; + *reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip; if (efer & EFER_LMA) { #ifdef CONFIG_X86_64 - ctxt->regs[VCPU_REGS_R11] = ctxt->eflags & ~EFLG_RF; + *reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags & ~EFLG_RF; ops->get_msr(ctxt, ctxt->mode == X86EMUL_MODE_PROT64 ? @@ -2191,7 +2246,7 @@ static int em_syscall(struct x86_emulate_ctxt *ctxt) static int em_sysenter(struct x86_emulate_ctxt *ctxt) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; struct desc_struct cs, ss; u64 msr_data; u16 cs_sel, ss_sel; @@ -2228,6 +2283,8 @@ static int em_sysenter(struct x86_emulate_ctxt *ctxt) if (msr_data == 0x0) return emulate_gp(ctxt, 0); break; + default: + break; } ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF); @@ -2247,14 +2304,14 @@ static int em_sysenter(struct x86_emulate_ctxt *ctxt) ctxt->_eip = msr_data; ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data); - ctxt->regs[VCPU_REGS_RSP] = msr_data; + *reg_write(ctxt, VCPU_REGS_RSP) = msr_data; return X86EMUL_CONTINUE; } static int em_sysexit(struct x86_emulate_ctxt *ctxt) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; struct desc_struct cs, ss; u64 msr_data; int usermode; @@ -2297,8 +2354,8 @@ static int em_sysexit(struct x86_emulate_ctxt *ctxt) ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS); ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS); - ctxt->_eip = ctxt->regs[VCPU_REGS_RDX]; - ctxt->regs[VCPU_REGS_RSP] = ctxt->regs[VCPU_REGS_RCX]; + ctxt->_eip = reg_read(ctxt, VCPU_REGS_RDX); + *reg_write(ctxt, VCPU_REGS_RSP) = reg_read(ctxt, VCPU_REGS_RCX); return X86EMUL_CONTINUE; } @@ -2317,7 +2374,7 @@ static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt) static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt, u16 port, u16 len) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; struct desc_struct tr_seg; u32 base3; int r; @@ -2367,14 +2424,14 @@ static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt, { tss->ip = ctxt->_eip; tss->flag = ctxt->eflags; - tss->ax = ctxt->regs[VCPU_REGS_RAX]; - tss->cx = ctxt->regs[VCPU_REGS_RCX]; - tss->dx = ctxt->regs[VCPU_REGS_RDX]; - tss->bx = ctxt->regs[VCPU_REGS_RBX]; - tss->sp = ctxt->regs[VCPU_REGS_RSP]; - tss->bp = ctxt->regs[VCPU_REGS_RBP]; - tss->si = ctxt->regs[VCPU_REGS_RSI]; - tss->di = ctxt->regs[VCPU_REGS_RDI]; + tss->ax = reg_read(ctxt, VCPU_REGS_RAX); + tss->cx = reg_read(ctxt, VCPU_REGS_RCX); + tss->dx = reg_read(ctxt, VCPU_REGS_RDX); + tss->bx = reg_read(ctxt, VCPU_REGS_RBX); + tss->sp = reg_read(ctxt, VCPU_REGS_RSP); + tss->bp = reg_read(ctxt, VCPU_REGS_RBP); + tss->si = reg_read(ctxt, VCPU_REGS_RSI); + tss->di = reg_read(ctxt, VCPU_REGS_RDI); tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); @@ -2390,14 +2447,14 @@ static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt, ctxt->_eip = tss->ip; ctxt->eflags = tss->flag | 2; - ctxt->regs[VCPU_REGS_RAX] = tss->ax; - ctxt->regs[VCPU_REGS_RCX] = tss->cx; - ctxt->regs[VCPU_REGS_RDX] = tss->dx; - ctxt->regs[VCPU_REGS_RBX] = tss->bx; - ctxt->regs[VCPU_REGS_RSP] = tss->sp; - ctxt->regs[VCPU_REGS_RBP] = tss->bp; - ctxt->regs[VCPU_REGS_RSI] = tss->si; - ctxt->regs[VCPU_REGS_RDI] = tss->di; + *reg_write(ctxt, VCPU_REGS_RAX) = tss->ax; + *reg_write(ctxt, VCPU_REGS_RCX) = tss->cx; + *reg_write(ctxt, VCPU_REGS_RDX) = tss->dx; + *reg_write(ctxt, VCPU_REGS_RBX) = tss->bx; + *reg_write(ctxt, VCPU_REGS_RSP) = tss->sp; + *reg_write(ctxt, VCPU_REGS_RBP) = tss->bp; + *reg_write(ctxt, VCPU_REGS_RSI) = tss->si; + *reg_write(ctxt, VCPU_REGS_RDI) = tss->di; /* * SDM says that segment selectors are loaded before segment @@ -2410,7 +2467,7 @@ static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt, set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS); /* - * Now load segment descriptors. If fault happenes at this stage + * Now load segment descriptors. If fault happens at this stage * it is handled in a context of new task */ ret = load_segment_descriptor(ctxt, tss->ldt, VCPU_SREG_LDTR); @@ -2436,7 +2493,7 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt, u16 tss_selector, u16 old_tss_sel, ulong old_tss_base, struct desc_struct *new_desc) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; struct tss_segment_16 tss_seg; int ret; u32 new_tss_base = get_desc_base(new_desc); @@ -2482,14 +2539,14 @@ static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt, tss->cr3 = ctxt->ops->get_cr(ctxt, 3); tss->eip = ctxt->_eip; tss->eflags = ctxt->eflags; - tss->eax = ctxt->regs[VCPU_REGS_RAX]; - tss->ecx = ctxt->regs[VCPU_REGS_RCX]; - tss->edx = ctxt->regs[VCPU_REGS_RDX]; - tss->ebx = ctxt->regs[VCPU_REGS_RBX]; - tss->esp = ctxt->regs[VCPU_REGS_RSP]; - tss->ebp = ctxt->regs[VCPU_REGS_RBP]; - tss->esi = ctxt->regs[VCPU_REGS_RSI]; - tss->edi = ctxt->regs[VCPU_REGS_RDI]; + tss->eax = reg_read(ctxt, VCPU_REGS_RAX); + tss->ecx = reg_read(ctxt, VCPU_REGS_RCX); + tss->edx = reg_read(ctxt, VCPU_REGS_RDX); + tss->ebx = reg_read(ctxt, VCPU_REGS_RBX); + tss->esp = reg_read(ctxt, VCPU_REGS_RSP); + tss->ebp = reg_read(ctxt, VCPU_REGS_RBP); + tss->esi = reg_read(ctxt, VCPU_REGS_RSI); + tss->edi = reg_read(ctxt, VCPU_REGS_RDI); tss->es = get_segment_selector(ctxt, VCPU_SREG_ES); tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS); @@ -2511,14 +2568,14 @@ static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt, ctxt->eflags = tss->eflags | 2; /* General purpose registers */ - ctxt->regs[VCPU_REGS_RAX] = tss->eax; - ctxt->regs[VCPU_REGS_RCX] = tss->ecx; - ctxt->regs[VCPU_REGS_RDX] = tss->edx; - ctxt->regs[VCPU_REGS_RBX] = tss->ebx; - ctxt->regs[VCPU_REGS_RSP] = tss->esp; - ctxt->regs[VCPU_REGS_RBP] = tss->ebp; - ctxt->regs[VCPU_REGS_RSI] = tss->esi; - ctxt->regs[VCPU_REGS_RDI] = tss->edi; + *reg_write(ctxt, VCPU_REGS_RAX) = tss->eax; + *reg_write(ctxt, VCPU_REGS_RCX) = tss->ecx; + *reg_write(ctxt, VCPU_REGS_RDX) = tss->edx; + *reg_write(ctxt, VCPU_REGS_RBX) = tss->ebx; + *reg_write(ctxt, VCPU_REGS_RSP) = tss->esp; + *reg_write(ctxt, VCPU_REGS_RBP) = tss->ebp; + *reg_write(ctxt, VCPU_REGS_RSI) = tss->esi; + *reg_write(ctxt, VCPU_REGS_RDI) = tss->edi; /* * SDM says that segment selectors are loaded before segment @@ -2583,7 +2640,7 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt, u16 tss_selector, u16 old_tss_sel, ulong old_tss_base, struct desc_struct *new_desc) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; struct tss_segment_32 tss_seg; int ret; u32 new_tss_base = get_desc_base(new_desc); @@ -2627,7 +2684,7 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, u16 tss_selector, int idt_index, int reason, bool has_error_code, u32 error_code) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; struct desc_struct curr_tss_desc, next_tss_desc; int ret; u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR); @@ -2652,7 +2709,7 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, * * 1. jmp/call/int to task gate: Check against DPL of the task gate * 2. Exception/IRQ/iret: No check is performed - * 3. jmp/call to TSS: Check agains DPL of the TSS + * 3. jmp/call to TSS: Check against DPL of the TSS */ if (reason == TASK_SWITCH_GATE) { if (idt_index != -1) { @@ -2693,7 +2750,7 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt, ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT; /* set back link to prev task only if NT bit is set in eflags - note that old_tss_sel is not used afetr this point */ + note that old_tss_sel is not used after this point */ if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE) old_tss_sel = 0xffff; @@ -2733,26 +2790,28 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt, { int rc; + invalidate_registers(ctxt); ctxt->_eip = ctxt->eip; ctxt->dst.type = OP_NONE; rc = emulator_do_task_switch(ctxt, tss_selector, idt_index, reason, has_error_code, error_code); - if (rc == X86EMUL_CONTINUE) + if (rc == X86EMUL_CONTINUE) { ctxt->eip = ctxt->_eip; + writeback_registers(ctxt); + } return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; } -static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned seg, - int reg, struct operand *op) +static void string_addr_inc(struct x86_emulate_ctxt *ctxt, int reg, + struct operand *op) { - int df = (ctxt->eflags & EFLG_DF) ? -1 : 1; + int df = (ctxt->eflags & EFLG_DF) ? -op->count : op->count; - register_address_increment(ctxt, &ctxt->regs[reg], df * op->bytes); - op->addr.mem.ea = register_address(ctxt, ctxt->regs[reg]); - op->addr.mem.seg = seg; + register_address_increment(ctxt, reg_rmw(ctxt, reg), df * op->bytes); + op->addr.mem.ea = register_address(ctxt, reg_read(ctxt, reg)); } static int em_das(struct x86_emulate_ctxt *ctxt) @@ -2927,7 +2986,7 @@ static int em_cwd(struct x86_emulate_ctxt *ctxt) { ctxt->dst.type = OP_REG; ctxt->dst.bytes = ctxt->src.bytes; - ctxt->dst.addr.reg = &ctxt->regs[VCPU_REGS_RDX]; + ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); ctxt->dst.val = ~((ctxt->src.val >> (ctxt->src.bytes * 8 - 1)) - 1); return X86EMUL_CONTINUE; @@ -2938,8 +2997,8 @@ static int em_rdtsc(struct x86_emulate_ctxt *ctxt) u64 tsc = 0; ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc); - ctxt->regs[VCPU_REGS_RAX] = (u32)tsc; - ctxt->regs[VCPU_REGS_RDX] = tsc >> 32; + *reg_write(ctxt, VCPU_REGS_RAX) = (u32)tsc; + *reg_write(ctxt, VCPU_REGS_RDX) = tsc >> 32; return X86EMUL_CONTINUE; } @@ -2947,10 +3006,10 @@ static int em_rdpmc(struct x86_emulate_ctxt *ctxt) { u64 pmc; - if (ctxt->ops->read_pmc(ctxt, ctxt->regs[VCPU_REGS_RCX], &pmc)) + if (ctxt->ops->read_pmc(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &pmc)) return emulate_gp(ctxt, 0); - ctxt->regs[VCPU_REGS_RAX] = (u32)pmc; - ctxt->regs[VCPU_REGS_RDX] = pmc >> 32; + *reg_write(ctxt, VCPU_REGS_RAX) = (u32)pmc; + *reg_write(ctxt, VCPU_REGS_RDX) = pmc >> 32; return X86EMUL_CONTINUE; } @@ -2992,9 +3051,9 @@ static int em_wrmsr(struct x86_emulate_ctxt *ctxt) { u64 msr_data; - msr_data = (u32)ctxt->regs[VCPU_REGS_RAX] - | ((u64)ctxt->regs[VCPU_REGS_RDX] << 32); - if (ctxt->ops->set_msr(ctxt, ctxt->regs[VCPU_REGS_RCX], msr_data)) + msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX) + | ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32); + if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data)) return emulate_gp(ctxt, 0); return X86EMUL_CONTINUE; @@ -3004,11 +3063,11 @@ static int em_rdmsr(struct x86_emulate_ctxt *ctxt) { u64 msr_data; - if (ctxt->ops->get_msr(ctxt, ctxt->regs[VCPU_REGS_RCX], &msr_data)) + if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data)) return emulate_gp(ctxt, 0); - ctxt->regs[VCPU_REGS_RAX] = (u32)msr_data; - ctxt->regs[VCPU_REGS_RDX] = msr_data >> 32; + *reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data; + *reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32; return X86EMUL_CONTINUE; } @@ -3188,8 +3247,8 @@ static int em_lmsw(struct x86_emulate_ctxt *ctxt) static int em_loop(struct x86_emulate_ctxt *ctxt) { - register_address_increment(ctxt, &ctxt->regs[VCPU_REGS_RCX], -1); - if ((address_mask(ctxt, ctxt->regs[VCPU_REGS_RCX]) != 0) && + register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX), -1); + if ((address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) != 0) && (ctxt->b == 0xe2 || test_cc(ctxt->b ^ 0x5, ctxt->eflags))) jmp_rel(ctxt, ctxt->src.val); @@ -3198,7 +3257,7 @@ static int em_loop(struct x86_emulate_ctxt *ctxt) static int em_jcxz(struct x86_emulate_ctxt *ctxt) { - if (address_mask(ctxt, ctxt->regs[VCPU_REGS_RCX]) == 0) + if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) jmp_rel(ctxt, ctxt->src.val); return X86EMUL_CONTINUE; @@ -3286,20 +3345,20 @@ static int em_cpuid(struct x86_emulate_ctxt *ctxt) { u32 eax, ebx, ecx, edx; - eax = ctxt->regs[VCPU_REGS_RAX]; - ecx = ctxt->regs[VCPU_REGS_RCX]; + eax = reg_read(ctxt, VCPU_REGS_RAX); + ecx = reg_read(ctxt, VCPU_REGS_RCX); ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx); - ctxt->regs[VCPU_REGS_RAX] = eax; - ctxt->regs[VCPU_REGS_RBX] = ebx; - ctxt->regs[VCPU_REGS_RCX] = ecx; - ctxt->regs[VCPU_REGS_RDX] = edx; + *reg_write(ctxt, VCPU_REGS_RAX) = eax; + *reg_write(ctxt, VCPU_REGS_RBX) = ebx; + *reg_write(ctxt, VCPU_REGS_RCX) = ecx; + *reg_write(ctxt, VCPU_REGS_RDX) = edx; return X86EMUL_CONTINUE; } static int em_lahf(struct x86_emulate_ctxt *ctxt) { - ctxt->regs[VCPU_REGS_RAX] &= ~0xff00UL; - ctxt->regs[VCPU_REGS_RAX] |= (ctxt->eflags & 0xff) << 8; + *reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL; + *reg_rmw(ctxt, VCPU_REGS_RAX) |= (ctxt->eflags & 0xff) << 8; return X86EMUL_CONTINUE; } @@ -3456,7 +3515,7 @@ static int check_svme(struct x86_emulate_ctxt *ctxt) static int check_svme_pa(struct x86_emulate_ctxt *ctxt) { - u64 rax = ctxt->regs[VCPU_REGS_RAX]; + u64 rax = reg_read(ctxt, VCPU_REGS_RAX); /* Valid physical address? */ if (rax & 0xffff000000000000ULL) @@ -3478,7 +3537,7 @@ static int check_rdtsc(struct x86_emulate_ctxt *ctxt) static int check_rdpmc(struct x86_emulate_ctxt *ctxt) { u64 cr4 = ctxt->ops->get_cr(ctxt, 4); - u64 rcx = ctxt->regs[VCPU_REGS_RCX]; + u64 rcx = reg_read(ctxt, VCPU_REGS_RCX); if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) || (rcx > 3)) @@ -3531,13 +3590,13 @@ static int check_perm_out(struct x86_emulate_ctxt *ctxt) I2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \ I2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e) -static struct opcode group7_rm1[] = { +static const struct opcode group7_rm1[] = { DI(SrcNone | Priv, monitor), DI(SrcNone | Priv, mwait), N, N, N, N, N, N, }; -static struct opcode group7_rm3[] = { +static const struct opcode group7_rm3[] = { DIP(SrcNone | Prot | Priv, vmrun, check_svme_pa), II(SrcNone | Prot | VendorSpecific, em_vmmcall, vmmcall), DIP(SrcNone | Prot | Priv, vmload, check_svme_pa), @@ -3548,13 +3607,13 @@ static struct opcode group7_rm3[] = { DIP(SrcNone | Prot | Priv, invlpga, check_svme), }; -static struct opcode group7_rm7[] = { +static const struct opcode group7_rm7[] = { N, DIP(SrcNone, rdtscp, check_rdtsc), N, N, N, N, N, N, }; -static struct opcode group1[] = { +static const struct opcode group1[] = { I(Lock, em_add), I(Lock | PageTable, em_or), I(Lock, em_adc), @@ -3565,11 +3624,11 @@ static struct opcode group1[] = { I(0, em_cmp), }; -static struct opcode group1A[] = { +static const struct opcode group1A[] = { I(DstMem | SrcNone | Mov | Stack, em_pop), N, N, N, N, N, N, N, }; -static struct opcode group3[] = { +static const struct opcode group3[] = { I(DstMem | SrcImm, em_test), I(DstMem | SrcImm, em_test), I(DstMem | SrcNone | Lock, em_not), @@ -3580,13 +3639,13 @@ static struct opcode group3[] = { I(SrcMem, em_idiv_ex), }; -static struct opcode group4[] = { +static const struct opcode group4[] = { I(ByteOp | DstMem | SrcNone | Lock, em_grp45), I(ByteOp | DstMem | SrcNone | Lock, em_grp45), N, N, N, N, N, N, }; -static struct opcode group5[] = { +static const struct opcode group5[] = { I(DstMem | SrcNone | Lock, em_grp45), I(DstMem | SrcNone | Lock, em_grp45), I(SrcMem | Stack, em_grp45), @@ -3596,7 +3655,7 @@ static struct opcode group5[] = { I(SrcMem | Stack, em_grp45), N, }; -static struct opcode group6[] = { +static const struct opcode group6[] = { DI(Prot, sldt), DI(Prot, str), II(Prot | Priv | SrcMem16, em_lldt, lldt), @@ -3604,7 +3663,7 @@ static struct opcode group6[] = { N, N, N, N, }; -static struct group_dual group7 = { { +static const struct group_dual group7 = { { II(Mov | DstMem | Priv, em_sgdt, sgdt), II(Mov | DstMem | Priv, em_sidt, sidt), II(SrcMem | Priv, em_lgdt, lgdt), @@ -3621,7 +3680,7 @@ static struct group_dual group7 = { { EXT(0, group7_rm7), } }; -static struct opcode group8[] = { +static const struct opcode group8[] = { N, N, N, N, I(DstMem | SrcImmByte, em_bt), I(DstMem | SrcImmByte | Lock | PageTable, em_bts), @@ -3629,26 +3688,26 @@ static struct opcode group8[] = { I(DstMem | SrcImmByte | Lock | PageTable, em_btc), }; -static struct group_dual group9 = { { +static const struct group_dual group9 = { { N, I(DstMem64 | Lock | PageTable, em_cmpxchg8b), N, N, N, N, N, N, }, { N, N, N, N, N, N, N, N, } }; -static struct opcode group11[] = { +static const struct opcode group11[] = { I(DstMem | SrcImm | Mov | PageTable, em_mov), X7(D(Undefined)), }; -static struct gprefix pfx_0f_6f_0f_7f = { +static const struct gprefix pfx_0f_6f_0f_7f = { I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov), }; -static struct gprefix pfx_vmovntpx = { +static const struct gprefix pfx_vmovntpx = { I(0, em_mov), N, N, N, }; -static struct opcode opcode_table[256] = { +static const struct opcode opcode_table[256] = { /* 0x00 - 0x07 */ I6ALU(Lock, em_add), I(ImplicitOps | Stack | No64 | Src2ES, em_push_sreg), @@ -3689,7 +3748,7 @@ static struct opcode opcode_table[256] = { I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op), I(SrcImmByte | Mov | Stack, em_push), I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op), - I2bvIP(DstDI | SrcDX | Mov | String, em_in, ins, check_perm_in), /* insb, insw/insd */ + I2bvIP(DstDI | SrcDX | Mov | String | Unaligned, em_in, ins, check_perm_in), /* insb, insw/insd */ I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */ /* 0x70 - 0x7F */ X16(D(SrcImmByte)), @@ -3765,7 +3824,7 @@ static struct opcode opcode_table[256] = { D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5), }; -static struct opcode twobyte_table[256] = { +static const struct opcode twobyte_table[256] = { /* 0x00 - 0x0F */ G(0, group6), GD(0, &group7), N, N, N, I(ImplicitOps | VendorSpecific, em_syscall), @@ -3936,7 +3995,7 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op, case OpAcc: op->type = OP_REG; op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; - op->addr.reg = &ctxt->regs[VCPU_REGS_RAX]; + op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX); fetch_register_operand(op); op->orig_val = op->val; break; @@ -3944,19 +4003,20 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op, op->type = OP_MEM; op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; op->addr.mem.ea = - register_address(ctxt, ctxt->regs[VCPU_REGS_RDI]); + register_address(ctxt, reg_read(ctxt, VCPU_REGS_RDI)); op->addr.mem.seg = VCPU_SREG_ES; op->val = 0; + op->count = 1; break; case OpDX: op->type = OP_REG; op->bytes = 2; - op->addr.reg = &ctxt->regs[VCPU_REGS_RDX]; + op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX); fetch_register_operand(op); break; case OpCL: op->bytes = 1; - op->val = ctxt->regs[VCPU_REGS_RCX] & 0xff; + op->val = reg_read(ctxt, VCPU_REGS_RCX) & 0xff; break; case OpImmByte: rc = decode_imm(ctxt, op, 1, true); @@ -3987,9 +4047,10 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op, op->type = OP_MEM; op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes; op->addr.mem.ea = - register_address(ctxt, ctxt->regs[VCPU_REGS_RSI]); + register_address(ctxt, reg_read(ctxt, VCPU_REGS_RSI)); op->addr.mem.seg = seg_override(ctxt); op->val = 0; + op->count = 1; break; case OpImmFAddr: op->type = OP_IMM; @@ -4293,9 +4354,10 @@ static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt, read_mmx_reg(ctxt, &op->mm_val, op->addr.mm); } + int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) { - struct x86_emulate_ops *ops = ctxt->ops; + const struct x86_emulate_ops *ops = ctxt->ops; int rc = X86EMUL_CONTINUE; int saved_dst_type = ctxt->dst.type; @@ -4356,7 +4418,7 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) } /* Instruction can only be executed in protected mode */ - if ((ctxt->d & Prot) && !(ctxt->mode & X86EMUL_MODE_PROT)) { + if ((ctxt->d & Prot) && ctxt->mode < X86EMUL_MODE_PROT16) { rc = emulate_ud(ctxt); goto done; } @@ -4377,7 +4439,7 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) if (ctxt->rep_prefix && (ctxt->d & String)) { /* All REP prefixes have the same first termination condition */ - if (address_mask(ctxt, ctxt->regs[VCPU_REGS_RCX]) == 0) { + if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) { ctxt->eip = ctxt->_eip; goto done; } @@ -4450,7 +4512,7 @@ special_insn: ctxt->dst.val = ctxt->src.addr.mem.ea; break; case 0x90 ... 0x97: /* nop / xchg reg, rax */ - if (ctxt->dst.addr.reg == &ctxt->regs[VCPU_REGS_RAX]) + if (ctxt->dst.addr.reg == reg_rmw(ctxt, VCPU_REGS_RAX)) break; rc = em_xchg(ctxt); break; @@ -4478,7 +4540,7 @@ special_insn: rc = em_grp2(ctxt); break; case 0xd2 ... 0xd3: /* Grp2 */ - ctxt->src.val = ctxt->regs[VCPU_REGS_RCX]; + ctxt->src.val = reg_read(ctxt, VCPU_REGS_RCX); rc = em_grp2(ctxt); break; case 0xe9: /* jmp rel */ @@ -4524,23 +4586,27 @@ writeback: ctxt->dst.type = saved_dst_type; if ((ctxt->d & SrcMask) == SrcSI) - string_addr_inc(ctxt, seg_override(ctxt), - VCPU_REGS_RSI, &ctxt->src); + string_addr_inc(ctxt, VCPU_REGS_RSI, &ctxt->src); if ((ctxt->d & DstMask) == DstDI) - string_addr_inc(ctxt, VCPU_SREG_ES, VCPU_REGS_RDI, - &ctxt->dst); + string_addr_inc(ctxt, VCPU_REGS_RDI, &ctxt->dst); if (ctxt->rep_prefix && (ctxt->d & String)) { + unsigned int count; struct read_cache *r = &ctxt->io_read; - register_address_increment(ctxt, &ctxt->regs[VCPU_REGS_RCX], -1); + if ((ctxt->d & SrcMask) == SrcSI) + count = ctxt->src.count; + else + count = ctxt->dst.count; + register_address_increment(ctxt, reg_rmw(ctxt, VCPU_REGS_RCX), + -count); if (!string_insn_completed(ctxt)) { /* * Re-enter guest when pio read ahead buffer is empty * or, if it is not used, after each 1024 iteration. */ - if ((r->end != 0 || ctxt->regs[VCPU_REGS_RCX] & 0x3ff) && + if ((r->end != 0 || reg_read(ctxt, VCPU_REGS_RCX) & 0x3ff) && (r->end == 0 || r->end != r->pos)) { /* * Reset read cache. Usually happens before @@ -4548,6 +4614,7 @@ writeback: * we have to do it here. */ ctxt->mem_read.end = 0; + writeback_registers(ctxt); return EMULATION_RESTART; } goto done; /* skip rip writeback */ @@ -4562,6 +4629,9 @@ done: if (rc == X86EMUL_INTERCEPTED) return EMULATION_INTERCEPTED; + if (rc == X86EMUL_CONTINUE) + writeback_registers(ctxt); + return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK; twobyte_insn: @@ -4634,3 +4704,13 @@ twobyte_insn: cannot_emulate: return EMULATION_FAILED; } + +void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt) +{ + invalidate_registers(ctxt); +} + +void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt) +{ + writeback_registers(ctxt); +} diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index adba28f88d1a..11300d2fa714 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -108,7 +108,7 @@ static s64 __kpit_elapsed(struct kvm *kvm) ktime_t remaining; struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state; - if (!ps->pit_timer.period) + if (!ps->period) return 0; /* @@ -120,9 +120,9 @@ static s64 __kpit_elapsed(struct kvm *kvm) * itself with the initial count and continues counting * from there. */ - remaining = hrtimer_get_remaining(&ps->pit_timer.timer); - elapsed = ps->pit_timer.period - ktime_to_ns(remaining); - elapsed = mod_64(elapsed, ps->pit_timer.period); + remaining = hrtimer_get_remaining(&ps->timer); + elapsed = ps->period - ktime_to_ns(remaining); + elapsed = mod_64(elapsed, ps->period); return elapsed; } @@ -238,12 +238,12 @@ static void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian) int value; spin_lock(&ps->inject_lock); - value = atomic_dec_return(&ps->pit_timer.pending); + value = atomic_dec_return(&ps->pending); if (value < 0) /* spurious acks can be generated if, for example, the * PIC is being reset. Handle it gracefully here */ - atomic_inc(&ps->pit_timer.pending); + atomic_inc(&ps->pending); else if (value > 0) /* in this case, we had multiple outstanding pit interrupts * that we needed to inject. Reinject @@ -261,28 +261,17 @@ void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu) if (!kvm_vcpu_is_bsp(vcpu) || !pit) return; - timer = &pit->pit_state.pit_timer.timer; + timer = &pit->pit_state.timer; if (hrtimer_cancel(timer)) hrtimer_start_expires(timer, HRTIMER_MODE_ABS); } static void destroy_pit_timer(struct kvm_pit *pit) { - hrtimer_cancel(&pit->pit_state.pit_timer.timer); + hrtimer_cancel(&pit->pit_state.timer); flush_kthread_work(&pit->expired); } -static bool kpit_is_periodic(struct kvm_timer *ktimer) -{ - struct kvm_kpit_state *ps = container_of(ktimer, struct kvm_kpit_state, - pit_timer); - return ps->is_periodic; -} - -static struct kvm_timer_ops kpit_ops = { - .is_periodic = kpit_is_periodic, -}; - static void pit_do_work(struct kthread_work *work) { struct kvm_pit *pit = container_of(work, struct kvm_pit, expired); @@ -322,16 +311,16 @@ static void pit_do_work(struct kthread_work *work) static enum hrtimer_restart pit_timer_fn(struct hrtimer *data) { - struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer); - struct kvm_pit *pt = ktimer->kvm->arch.vpit; + struct kvm_kpit_state *ps = container_of(data, struct kvm_kpit_state, timer); + struct kvm_pit *pt = ps->kvm->arch.vpit; - if (ktimer->reinject || !atomic_read(&ktimer->pending)) { - atomic_inc(&ktimer->pending); + if (ps->reinject || !atomic_read(&ps->pending)) { + atomic_inc(&ps->pending); queue_kthread_work(&pt->worker, &pt->expired); } - if (ktimer->t_ops->is_periodic(ktimer)) { - hrtimer_add_expires_ns(&ktimer->timer, ktimer->period); + if (ps->is_periodic) { + hrtimer_add_expires_ns(&ps->timer, ps->period); return HRTIMER_RESTART; } else return HRTIMER_NORESTART; @@ -340,7 +329,6 @@ static enum hrtimer_restart pit_timer_fn(struct hrtimer *data) static void create_pit_timer(struct kvm *kvm, u32 val, int is_period) { struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state; - struct kvm_timer *pt = &ps->pit_timer; s64 interval; if (!irqchip_in_kernel(kvm) || ps->flags & KVM_PIT_FLAGS_HPET_LEGACY) @@ -351,19 +339,18 @@ static void create_pit_timer(struct kvm *kvm, u32 val, int is_period) pr_debug("create pit timer, interval is %llu nsec\n", interval); /* TODO The new value only affected after the retriggered */ - hrtimer_cancel(&pt->timer); + hrtimer_cancel(&ps->timer); flush_kthread_work(&ps->pit->expired); - pt->period = interval; + ps->period = interval; ps->is_periodic = is_period; - pt->timer.function = pit_timer_fn; - pt->t_ops = &kpit_ops; - pt->kvm = ps->pit->kvm; + ps->timer.function = pit_timer_fn; + ps->kvm = ps->pit->kvm; - atomic_set(&pt->pending, 0); + atomic_set(&ps->pending, 0); ps->irq_ack = 1; - hrtimer_start(&pt->timer, ktime_add_ns(ktime_get(), interval), + hrtimer_start(&ps->timer, ktime_add_ns(ktime_get(), interval), HRTIMER_MODE_ABS); } @@ -639,7 +626,7 @@ void kvm_pit_reset(struct kvm_pit *pit) } mutex_unlock(&pit->pit_state.lock); - atomic_set(&pit->pit_state.pit_timer.pending, 0); + atomic_set(&pit->pit_state.pending, 0); pit->pit_state.irq_ack = 1; } @@ -648,7 +635,7 @@ static void pit_mask_notifer(struct kvm_irq_mask_notifier *kimn, bool mask) struct kvm_pit *pit = container_of(kimn, struct kvm_pit, mask_notifier); if (!mask) { - atomic_set(&pit->pit_state.pit_timer.pending, 0); + atomic_set(&pit->pit_state.pending, 0); pit->pit_state.irq_ack = 1; } } @@ -706,12 +693,11 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags) pit_state = &pit->pit_state; pit_state->pit = pit; - hrtimer_init(&pit_state->pit_timer.timer, - CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + hrtimer_init(&pit_state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); pit_state->irq_ack_notifier.gsi = 0; pit_state->irq_ack_notifier.irq_acked = kvm_pit_ack_irq; kvm_register_irq_ack_notifier(kvm, &pit_state->irq_ack_notifier); - pit_state->pit_timer.reinject = true; + pit_state->reinject = true; mutex_unlock(&pit->pit_state.lock); kvm_pit_reset(pit); @@ -761,7 +747,7 @@ void kvm_free_pit(struct kvm *kvm) kvm_unregister_irq_ack_notifier(kvm, &kvm->arch.vpit->pit_state.irq_ack_notifier); mutex_lock(&kvm->arch.vpit->pit_state.lock); - timer = &kvm->arch.vpit->pit_state.pit_timer.timer; + timer = &kvm->arch.vpit->pit_state.timer; hrtimer_cancel(timer); flush_kthread_work(&kvm->arch.vpit->expired); kthread_stop(kvm->arch.vpit->worker_task); diff --git a/arch/x86/kvm/i8254.h b/arch/x86/kvm/i8254.h index fdf40425ea1d..dd1b16b611b0 100644 --- a/arch/x86/kvm/i8254.h +++ b/arch/x86/kvm/i8254.h @@ -24,8 +24,12 @@ struct kvm_kpit_channel_state { struct kvm_kpit_state { struct kvm_kpit_channel_state channels[3]; u32 flags; - struct kvm_timer pit_timer; bool is_periodic; + s64 period; /* unit: ns */ + struct hrtimer timer; + atomic_t pending; /* accumulated triggered timers */ + bool reinject; + struct kvm *kvm; u32 speaker_data_on; struct mutex lock; struct kvm_pit *pit; diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index 9fc9aa7ac703..848206df0967 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -190,17 +190,17 @@ void kvm_pic_update_irq(struct kvm_pic *s) int kvm_pic_set_irq(struct kvm_pic *s, int irq, int irq_source_id, int level) { - int ret = -1; + int ret, irq_level; + + BUG_ON(irq < 0 || irq >= PIC_NUM_PINS); pic_lock(s); - if (irq >= 0 && irq < PIC_NUM_PINS) { - int irq_level = __kvm_irq_line_state(&s->irq_states[irq], - irq_source_id, level); - ret = pic_set_irq1(&s->pics[irq >> 3], irq & 7, irq_level); - pic_update_irq(s); - trace_kvm_pic_set_irq(irq >> 3, irq & 7, s->pics[irq >> 3].elcr, - s->pics[irq >> 3].imr, ret == 0); - } + irq_level = __kvm_irq_line_state(&s->irq_states[irq], + irq_source_id, level); + ret = pic_set_irq1(&s->pics[irq >> 3], irq & 7, irq_level); + pic_update_irq(s); + trace_kvm_pic_set_irq(irq >> 3, irq & 7, s->pics[irq >> 3].elcr, + s->pics[irq >> 3].imr, ret == 0); pic_unlock(s); return ret; @@ -275,23 +275,20 @@ void kvm_pic_reset(struct kvm_kpic_state *s) { int irq, i; struct kvm_vcpu *vcpu; - u8 irr = s->irr, isr = s->imr; + u8 edge_irr = s->irr & ~s->elcr; bool found = false; s->last_irr = 0; - s->irr = 0; + s->irr &= s->elcr; s->imr = 0; - s->isr = 0; s->priority_add = 0; - s->irq_base = 0; - s->read_reg_select = 0; - s->poll = 0; s->special_mask = 0; - s->init_state = 0; - s->auto_eoi = 0; - s->rotate_on_auto_eoi = 0; - s->special_fully_nested_mode = 0; - s->init4 = 0; + s->read_reg_select = 0; + if (!s->init4) { + s->special_fully_nested_mode = 0; + s->auto_eoi = 0; + } + s->init_state = 1; kvm_for_each_vcpu(i, vcpu, s->pics_state->kvm) if (kvm_apic_accept_pic_intr(vcpu)) { @@ -304,7 +301,7 @@ void kvm_pic_reset(struct kvm_kpic_state *s) return; for (irq = 0; irq < PIC_NUM_PINS/2; irq++) - if (irr & (1 << irq) || isr & (1 << irq)) + if (edge_irr & (1 << irq)) pic_clear_isr(s, irq); } @@ -316,40 +313,13 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val) addr &= 1; if (addr == 0) { if (val & 0x10) { - u8 edge_irr = s->irr & ~s->elcr; - int i; - bool found = false; - struct kvm_vcpu *vcpu; - s->init4 = val & 1; - s->last_irr = 0; - s->irr &= s->elcr; - s->imr = 0; - s->priority_add = 0; - s->special_mask = 0; - s->read_reg_select = 0; - if (!s->init4) { - s->special_fully_nested_mode = 0; - s->auto_eoi = 0; - } - s->init_state = 1; if (val & 0x02) pr_pic_unimpl("single mode not supported"); if (val & 0x08) pr_pic_unimpl( - "level sensitive irq not supported"); - - kvm_for_each_vcpu(i, vcpu, s->pics_state->kvm) - if (kvm_apic_accept_pic_intr(vcpu)) { - found = true; - break; - } - - - if (found) - for (irq = 0; irq < PIC_NUM_PINS/2; irq++) - if (edge_irr & (1 << irq)) - pic_clear_isr(s, irq); + "level sensitive irq not supported"); + kvm_pic_reset(s); } else if (val & 0x08) { if (val & 0x04) s->poll = 1; diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h index 2086f2bfba33..2d03568e9498 100644 --- a/arch/x86/kvm/irq.h +++ b/arch/x86/kvm/irq.h @@ -70,7 +70,7 @@ struct kvm_pic { struct kvm_io_device dev_slave; struct kvm_io_device dev_eclr; void (*ack_notifier)(void *opaque, int irq); - unsigned long irq_states[16]; + unsigned long irq_states[PIC_NUM_PINS]; }; struct kvm_pic *kvm_create_pic(struct kvm *kvm); diff --git a/arch/x86/kvm/kvm_timer.h b/arch/x86/kvm/kvm_timer.h deleted file mode 100644 index 497dbaa366d4..000000000000 --- a/arch/x86/kvm/kvm_timer.h +++ /dev/null @@ -1,18 +0,0 @@ - -struct kvm_timer { - struct hrtimer timer; - s64 period; /* unit: ns */ - u32 timer_mode_mask; - u64 tscdeadline; - atomic_t pending; /* accumulated triggered timers */ - bool reinject; - struct kvm_timer_ops *t_ops; - struct kvm *kvm; - struct kvm_vcpu *vcpu; -}; - -struct kvm_timer_ops { - bool (*is_periodic)(struct kvm_timer *); -}; - -enum hrtimer_restart kvm_timer_fn(struct hrtimer *data); diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index ce878788a39f..c6e6b721b6ee 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -34,6 +34,7 @@ #include <asm/current.h> #include <asm/apicdef.h> #include <linux/atomic.h> +#include <linux/jump_label.h> #include "kvm_cache_regs.h" #include "irq.h" #include "trace.h" @@ -65,6 +66,7 @@ #define APIC_DEST_NOSHORT 0x0 #define APIC_DEST_MASK 0x800 #define MAX_APIC_VECTOR 256 +#define APIC_VECTORS_PER_REG 32 #define VEC_POS(v) ((v) & (32 - 1)) #define REG_POS(v) (((v) >> 5) << 4) @@ -72,11 +74,6 @@ static unsigned int min_timer_period_us = 500; module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR); -static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off) -{ - return *((u32 *) (apic->regs + reg_off)); -} - static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val) { *((u32 *) (apic->regs + reg_off)) = val; @@ -117,19 +114,23 @@ static inline int __apic_test_and_clear_vector(int vec, void *bitmap) return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec)); } -static inline int apic_hw_enabled(struct kvm_lapic *apic) -{ - return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE; -} +struct static_key_deferred apic_hw_disabled __read_mostly; +struct static_key_deferred apic_sw_disabled __read_mostly; -static inline int apic_sw_enabled(struct kvm_lapic *apic) +static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val) { - return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED; + if ((kvm_apic_get_reg(apic, APIC_SPIV) ^ val) & APIC_SPIV_APIC_ENABLED) { + if (val & APIC_SPIV_APIC_ENABLED) + static_key_slow_dec_deferred(&apic_sw_disabled); + else + static_key_slow_inc(&apic_sw_disabled.key); + } + apic_set_reg(apic, APIC_SPIV, val); } static inline int apic_enabled(struct kvm_lapic *apic) { - return apic_sw_enabled(apic) && apic_hw_enabled(apic); + return kvm_apic_sw_enabled(apic) && kvm_apic_hw_enabled(apic); } #define LVT_MASK \ @@ -139,36 +140,135 @@ static inline int apic_enabled(struct kvm_lapic *apic) (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \ APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER) +static inline int apic_x2apic_mode(struct kvm_lapic *apic) +{ + return apic->vcpu->arch.apic_base & X2APIC_ENABLE; +} + static inline int kvm_apic_id(struct kvm_lapic *apic) { - return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff; + return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff; +} + +static inline u16 apic_cluster_id(struct kvm_apic_map *map, u32 ldr) +{ + u16 cid; + ldr >>= 32 - map->ldr_bits; + cid = (ldr >> map->cid_shift) & map->cid_mask; + + BUG_ON(cid >= ARRAY_SIZE(map->logical_map)); + + return cid; +} + +static inline u16 apic_logical_id(struct kvm_apic_map *map, u32 ldr) +{ + ldr >>= (32 - map->ldr_bits); + return ldr & map->lid_mask; +} + +static void recalculate_apic_map(struct kvm *kvm) +{ + struct kvm_apic_map *new, *old = NULL; + struct kvm_vcpu *vcpu; + int i; + + new = kzalloc(sizeof(struct kvm_apic_map), GFP_KERNEL); + + mutex_lock(&kvm->arch.apic_map_lock); + + if (!new) + goto out; + + new->ldr_bits = 8; + /* flat mode is default */ + new->cid_shift = 8; + new->cid_mask = 0; + new->lid_mask = 0xff; + + kvm_for_each_vcpu(i, vcpu, kvm) { + struct kvm_lapic *apic = vcpu->arch.apic; + u16 cid, lid; + u32 ldr; + + if (!kvm_apic_present(vcpu)) + continue; + + /* + * All APICs have to be configured in the same mode by an OS. + * We take advatage of this while building logical id loockup + * table. After reset APICs are in xapic/flat mode, so if we + * find apic with different setting we assume this is the mode + * OS wants all apics to be in; build lookup table accordingly. + */ + if (apic_x2apic_mode(apic)) { + new->ldr_bits = 32; + new->cid_shift = 16; + new->cid_mask = new->lid_mask = 0xffff; + } else if (kvm_apic_sw_enabled(apic) && + !new->cid_mask /* flat mode */ && + kvm_apic_get_reg(apic, APIC_DFR) == APIC_DFR_CLUSTER) { + new->cid_shift = 4; + new->cid_mask = 0xf; + new->lid_mask = 0xf; + } + + new->phys_map[kvm_apic_id(apic)] = apic; + + ldr = kvm_apic_get_reg(apic, APIC_LDR); + cid = apic_cluster_id(new, ldr); + lid = apic_logical_id(new, ldr); + + if (lid) + new->logical_map[cid][ffs(lid) - 1] = apic; + } +out: + old = rcu_dereference_protected(kvm->arch.apic_map, + lockdep_is_held(&kvm->arch.apic_map_lock)); + rcu_assign_pointer(kvm->arch.apic_map, new); + mutex_unlock(&kvm->arch.apic_map_lock); + + if (old) + kfree_rcu(old, rcu); +} + +static inline void kvm_apic_set_id(struct kvm_lapic *apic, u8 id) +{ + apic_set_reg(apic, APIC_ID, id << 24); + recalculate_apic_map(apic->vcpu->kvm); +} + +static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id) +{ + apic_set_reg(apic, APIC_LDR, id); + recalculate_apic_map(apic->vcpu->kvm); } static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type) { - return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED); + return !(kvm_apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED); } static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type) { - return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK; + return kvm_apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK; } static inline int apic_lvtt_oneshot(struct kvm_lapic *apic) { - return ((apic_get_reg(apic, APIC_LVTT) & + return ((kvm_apic_get_reg(apic, APIC_LVTT) & apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_ONESHOT); } static inline int apic_lvtt_period(struct kvm_lapic *apic) { - return ((apic_get_reg(apic, APIC_LVTT) & + return ((kvm_apic_get_reg(apic, APIC_LVTT) & apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_PERIODIC); } static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic) { - return ((apic_get_reg(apic, APIC_LVTT) & + return ((kvm_apic_get_reg(apic, APIC_LVTT) & apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_TSCDEADLINE); } @@ -184,7 +284,7 @@ void kvm_apic_set_version(struct kvm_vcpu *vcpu) struct kvm_cpuid_entry2 *feat; u32 v = APIC_VERSION; - if (!irqchip_in_kernel(vcpu->kvm)) + if (!kvm_vcpu_has_lapic(vcpu)) return; feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0); @@ -193,12 +293,7 @@ void kvm_apic_set_version(struct kvm_vcpu *vcpu) apic_set_reg(apic, APIC_LVR, v); } -static inline int apic_x2apic_mode(struct kvm_lapic *apic) -{ - return apic->vcpu->arch.apic_base & X2APIC_ENABLE; -} - -static unsigned int apic_lvt_mask[APIC_LVT_NUM] = { +static const unsigned int apic_lvt_mask[APIC_LVT_NUM] = { LVT_MASK , /* part LVTT mask, timer mode mask added at runtime */ LVT_MASK | APIC_MODE_MASK, /* LVTTHMR */ LVT_MASK | APIC_MODE_MASK, /* LVTPC */ @@ -208,25 +303,30 @@ static unsigned int apic_lvt_mask[APIC_LVT_NUM] = { static int find_highest_vector(void *bitmap) { - u32 *word = bitmap; - int word_offset = MAX_APIC_VECTOR >> 5; + int vec; + u32 *reg; - while ((word_offset != 0) && (word[(--word_offset) << 2] == 0)) - continue; + for (vec = MAX_APIC_VECTOR - APIC_VECTORS_PER_REG; + vec >= 0; vec -= APIC_VECTORS_PER_REG) { + reg = bitmap + REG_POS(vec); + if (*reg) + return fls(*reg) - 1 + vec; + } - if (likely(!word_offset && !word[0])) - return -1; - else - return fls(word[word_offset << 2]) - 1 + (word_offset << 5); + return -1; } static u8 count_vectors(void *bitmap) { - u32 *word = bitmap; - int word_offset; + int vec; + u32 *reg; u8 count = 0; - for (word_offset = 0; word_offset < MAX_APIC_VECTOR >> 5; ++word_offset) - count += hweight32(word[word_offset << 2]); + + for (vec = 0; vec < MAX_APIC_VECTOR; vec += APIC_VECTORS_PER_REG) { + reg = bitmap + REG_POS(vec); + count += hweight32(*reg); + } + return count; } @@ -285,7 +385,6 @@ static inline void apic_clear_isr(int vec, struct kvm_lapic *apic) int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu) { - struct kvm_lapic *apic = vcpu->arch.apic; int highest_irr; /* This may race with setting of irr in __apic_accept_irq() and @@ -293,9 +392,9 @@ int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu) * will cause vmexit immediately and the value will be recalculated * on the next vmentry. */ - if (!apic) + if (!kvm_vcpu_has_lapic(vcpu)) return 0; - highest_irr = apic_find_highest_irr(apic); + highest_irr = apic_find_highest_irr(vcpu->arch.apic); return highest_irr; } @@ -378,8 +477,8 @@ static void apic_update_ppr(struct kvm_lapic *apic) u32 tpr, isrv, ppr, old_ppr; int isr; - old_ppr = apic_get_reg(apic, APIC_PROCPRI); - tpr = apic_get_reg(apic, APIC_TASKPRI); + old_ppr = kvm_apic_get_reg(apic, APIC_PROCPRI); + tpr = kvm_apic_get_reg(apic, APIC_TASKPRI); isr = apic_find_highest_isr(apic); isrv = (isr != -1) ? isr : 0; @@ -415,13 +514,13 @@ int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda) u32 logical_id; if (apic_x2apic_mode(apic)) { - logical_id = apic_get_reg(apic, APIC_LDR); + logical_id = kvm_apic_get_reg(apic, APIC_LDR); return logical_id & mda; } - logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR)); + logical_id = GET_APIC_LOGICAL_ID(kvm_apic_get_reg(apic, APIC_LDR)); - switch (apic_get_reg(apic, APIC_DFR)) { + switch (kvm_apic_get_reg(apic, APIC_DFR)) { case APIC_DFR_FLAT: if (logical_id & mda) result = 1; @@ -433,7 +532,7 @@ int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda) break; default: apic_debug("Bad DFR vcpu %d: %08x\n", - apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR)); + apic->vcpu->vcpu_id, kvm_apic_get_reg(apic, APIC_DFR)); break; } @@ -478,6 +577,72 @@ int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source, return result; } +bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, + struct kvm_lapic_irq *irq, int *r) +{ + struct kvm_apic_map *map; + unsigned long bitmap = 1; + struct kvm_lapic **dst; + int i; + bool ret = false; + + *r = -1; + + if (irq->shorthand == APIC_DEST_SELF) { + *r = kvm_apic_set_irq(src->vcpu, irq); + return true; + } + + if (irq->shorthand) + return false; + + rcu_read_lock(); + map = rcu_dereference(kvm->arch.apic_map); + + if (!map) + goto out; + + if (irq->dest_mode == 0) { /* physical mode */ + if (irq->delivery_mode == APIC_DM_LOWEST || + irq->dest_id == 0xff) + goto out; + dst = &map->phys_map[irq->dest_id & 0xff]; + } else { + u32 mda = irq->dest_id << (32 - map->ldr_bits); + + dst = map->logical_map[apic_cluster_id(map, mda)]; + + bitmap = apic_logical_id(map, mda); + + if (irq->delivery_mode == APIC_DM_LOWEST) { + int l = -1; + for_each_set_bit(i, &bitmap, 16) { + if (!dst[i]) + continue; + if (l < 0) + l = i; + else if (kvm_apic_compare_prio(dst[i]->vcpu, dst[l]->vcpu) < 0) + l = i; + } + + bitmap = (l >= 0) ? 1 << l : 0; + } + } + + for_each_set_bit(i, &bitmap, 16) { + if (!dst[i]) + continue; + if (*r < 0) + *r = 0; + *r += kvm_apic_set_irq(dst[i]->vcpu, irq); + } + + ret = true; +out: + rcu_read_unlock(); + return ret; +} + /* * Add a pending IRQ into lapic. * Return 1 if successfully added and 0 if discarded. @@ -591,7 +756,7 @@ static int apic_set_eoi(struct kvm_lapic *apic) apic_clear_isr(vector, apic); apic_update_ppr(apic); - if (!(apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI) && + if (!(kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI) && kvm_ioapic_handles_vector(apic->vcpu->kvm, vector)) { int trigger_mode; if (apic_test_vector(vector, apic->regs + APIC_TMR)) @@ -606,8 +771,8 @@ static int apic_set_eoi(struct kvm_lapic *apic) static void apic_send_ipi(struct kvm_lapic *apic) { - u32 icr_low = apic_get_reg(apic, APIC_ICR); - u32 icr_high = apic_get_reg(apic, APIC_ICR2); + u32 icr_low = kvm_apic_get_reg(apic, APIC_ICR); + u32 icr_high = kvm_apic_get_reg(apic, APIC_ICR2); struct kvm_lapic_irq irq; irq.vector = icr_low & APIC_VECTOR_MASK; @@ -642,7 +807,7 @@ static u32 apic_get_tmcct(struct kvm_lapic *apic) ASSERT(apic != NULL); /* if initial count is 0, current count should also be 0 */ - if (apic_get_reg(apic, APIC_TMICT) == 0) + if (kvm_apic_get_reg(apic, APIC_TMICT) == 0) return 0; remaining = hrtimer_get_remaining(&apic->lapic_timer.timer); @@ -696,13 +861,15 @@ static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset) val = apic_get_tmcct(apic); break; - + case APIC_PROCPRI: + apic_update_ppr(apic); + val = kvm_apic_get_reg(apic, offset); + break; case APIC_TASKPRI: report_tpr_access(apic, false); /* fall thru */ default: - apic_update_ppr(apic); - val = apic_get_reg(apic, offset); + val = kvm_apic_get_reg(apic, offset); break; } @@ -719,7 +886,7 @@ static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len, { unsigned char alignment = offset & 0xf; u32 result; - /* this bitmask has a bit cleared for each reserver register */ + /* this bitmask has a bit cleared for each reserved register */ static const u64 rmask = 0x43ff01ffffffe70cULL; if ((alignment + len) > 4) { @@ -754,7 +921,7 @@ static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len, static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr) { - return apic_hw_enabled(apic) && + return kvm_apic_hw_enabled(apic) && addr >= apic->base_address && addr < apic->base_address + LAPIC_MMIO_LENGTH; } @@ -777,7 +944,7 @@ static void update_divide_count(struct kvm_lapic *apic) { u32 tmp1, tmp2, tdcr; - tdcr = apic_get_reg(apic, APIC_TDCR); + tdcr = kvm_apic_get_reg(apic, APIC_TDCR); tmp1 = tdcr & 0xf; tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1; apic->divide_count = 0x1 << (tmp2 & 0x7); @@ -792,9 +959,9 @@ static void start_apic_timer(struct kvm_lapic *apic) atomic_set(&apic->lapic_timer.pending, 0); if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic)) { - /* lapic timer in oneshot or peroidic mode */ + /* lapic timer in oneshot or periodic mode */ now = apic->lapic_timer.timer.base->get_time(); - apic->lapic_timer.period = (u64)apic_get_reg(apic, APIC_TMICT) + apic->lapic_timer.period = (u64)kvm_apic_get_reg(apic, APIC_TMICT) * APIC_BUS_CYCLE_NS * apic->divide_count; if (!apic->lapic_timer.period) @@ -826,7 +993,7 @@ static void start_apic_timer(struct kvm_lapic *apic) "timer initial count 0x%x, period %lldns, " "expire @ 0x%016" PRIx64 ".\n", __func__, APIC_BUS_CYCLE_NS, ktime_to_ns(now), - apic_get_reg(apic, APIC_TMICT), + kvm_apic_get_reg(apic, APIC_TMICT), apic->lapic_timer.period, ktime_to_ns(ktime_add_ns(now, apic->lapic_timer.period))); @@ -858,7 +1025,7 @@ static void start_apic_timer(struct kvm_lapic *apic) static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val) { - int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0)); + int nmi_wd_enabled = apic_lvt_nmi_mode(kvm_apic_get_reg(apic, APIC_LVT0)); if (apic_lvt_nmi_mode(lvt0_val)) { if (!nmi_wd_enabled) { @@ -879,7 +1046,7 @@ static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val) switch (reg) { case APIC_ID: /* Local APIC ID */ if (!apic_x2apic_mode(apic)) - apic_set_reg(apic, APIC_ID, val); + kvm_apic_set_id(apic, val >> 24); else ret = 1; break; @@ -895,29 +1062,30 @@ static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val) case APIC_LDR: if (!apic_x2apic_mode(apic)) - apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK); + kvm_apic_set_ldr(apic, val & APIC_LDR_MASK); else ret = 1; break; case APIC_DFR: - if (!apic_x2apic_mode(apic)) + if (!apic_x2apic_mode(apic)) { apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF); - else + recalculate_apic_map(apic->vcpu->kvm); + } else ret = 1; break; case APIC_SPIV: { u32 mask = 0x3ff; - if (apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI) + if (kvm_apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI) mask |= APIC_SPIV_DIRECTED_EOI; - apic_set_reg(apic, APIC_SPIV, val & mask); + apic_set_spiv(apic, val & mask); if (!(val & APIC_SPIV_APIC_ENABLED)) { int i; u32 lvt_val; for (i = 0; i < APIC_LVT_NUM; i++) { - lvt_val = apic_get_reg(apic, + lvt_val = kvm_apic_get_reg(apic, APIC_LVTT + 0x10 * i); apic_set_reg(apic, APIC_LVTT + 0x10 * i, lvt_val | APIC_LVT_MASKED); @@ -946,7 +1114,7 @@ static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val) case APIC_LVT1: case APIC_LVTERR: /* TODO: Check vector */ - if (!apic_sw_enabled(apic)) + if (!kvm_apic_sw_enabled(apic)) val |= APIC_LVT_MASKED; val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4]; @@ -955,12 +1123,12 @@ static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val) break; case APIC_LVTT: - if ((apic_get_reg(apic, APIC_LVTT) & + if ((kvm_apic_get_reg(apic, APIC_LVTT) & apic->lapic_timer.timer_mode_mask) != (val & apic->lapic_timer.timer_mode_mask)) hrtimer_cancel(&apic->lapic_timer.timer); - if (!apic_sw_enabled(apic)) + if (!kvm_apic_sw_enabled(apic)) val |= APIC_LVT_MASKED; val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask); apic_set_reg(apic, APIC_LVTT, val); @@ -1039,24 +1207,30 @@ static int apic_mmio_write(struct kvm_io_device *this, void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu) { - struct kvm_lapic *apic = vcpu->arch.apic; - - if (apic) + if (kvm_vcpu_has_lapic(vcpu)) apic_reg_write(vcpu->arch.apic, APIC_EOI, 0); } EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi); void kvm_free_lapic(struct kvm_vcpu *vcpu) { + struct kvm_lapic *apic = vcpu->arch.apic; + if (!vcpu->arch.apic) return; - hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer); + hrtimer_cancel(&apic->lapic_timer.timer); + + if (!(vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE)) + static_key_slow_dec_deferred(&apic_hw_disabled); + + if (!(kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED)) + static_key_slow_dec_deferred(&apic_sw_disabled); - if (vcpu->arch.apic->regs) - free_page((unsigned long)vcpu->arch.apic->regs); + if (apic->regs) + free_page((unsigned long)apic->regs); - kfree(vcpu->arch.apic); + kfree(apic); } /* @@ -1068,10 +1242,9 @@ void kvm_free_lapic(struct kvm_vcpu *vcpu) u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!apic) - return 0; - if (apic_lvtt_oneshot(apic) || apic_lvtt_period(apic)) + if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) || + apic_lvtt_period(apic)) return 0; return apic->lapic_timer.tscdeadline; @@ -1080,10 +1253,9 @@ u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu) void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!apic) - return; - if (apic_lvtt_oneshot(apic) || apic_lvtt_period(apic)) + if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) || + apic_lvtt_period(apic)) return; hrtimer_cancel(&apic->lapic_timer.timer); @@ -1095,20 +1267,21 @@ void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!apic) + if (!kvm_vcpu_has_lapic(vcpu)) return; + apic_set_tpr(apic, ((cr8 & 0x0f) << 4) - | (apic_get_reg(apic, APIC_TASKPRI) & 4)); + | (kvm_apic_get_reg(apic, APIC_TASKPRI) & 4)); } u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu) { - struct kvm_lapic *apic = vcpu->arch.apic; u64 tpr; - if (!apic) + if (!kvm_vcpu_has_lapic(vcpu)) return 0; - tpr = (u64) apic_get_reg(apic, APIC_TASKPRI); + + tpr = (u64) kvm_apic_get_reg(vcpu->arch.apic, APIC_TASKPRI); return (tpr & 0xf0) >> 4; } @@ -1123,6 +1296,15 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value) return; } + /* update jump label if enable bit changes */ + if ((vcpu->arch.apic_base ^ value) & MSR_IA32_APICBASE_ENABLE) { + if (value & MSR_IA32_APICBASE_ENABLE) + static_key_slow_dec_deferred(&apic_hw_disabled); + else + static_key_slow_inc(&apic_hw_disabled.key); + recalculate_apic_map(vcpu->kvm); + } + if (!kvm_vcpu_is_bsp(apic->vcpu)) value &= ~MSR_IA32_APICBASE_BSP; @@ -1130,7 +1312,7 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value) if (apic_x2apic_mode(apic)) { u32 id = kvm_apic_id(apic); u32 ldr = ((id & ~0xf) << 16) | (1 << (id & 0xf)); - apic_set_reg(apic, APIC_LDR, ldr); + kvm_apic_set_ldr(apic, ldr); } apic->base_address = apic->vcpu->arch.apic_base & MSR_IA32_APICBASE_BASE; @@ -1155,7 +1337,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu) /* Stop the timer in case it's a reset to an active apic */ hrtimer_cancel(&apic->lapic_timer.timer); - apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24); + kvm_apic_set_id(apic, vcpu->vcpu_id); kvm_apic_set_version(apic->vcpu); for (i = 0; i < APIC_LVT_NUM; i++) @@ -1164,9 +1346,9 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu) SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT)); apic_set_reg(apic, APIC_DFR, 0xffffffffU); - apic_set_reg(apic, APIC_SPIV, 0xff); + apic_set_spiv(apic, 0xff); apic_set_reg(apic, APIC_TASKPRI, 0); - apic_set_reg(apic, APIC_LDR, 0); + kvm_apic_set_ldr(apic, 0); apic_set_reg(apic, APIC_ESR, 0); apic_set_reg(apic, APIC_ICR, 0); apic_set_reg(apic, APIC_ICR2, 0); @@ -1183,7 +1365,8 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu) update_divide_count(apic); atomic_set(&apic->lapic_timer.pending, 0); if (kvm_vcpu_is_bsp(vcpu)) - vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP; + kvm_lapic_set_base(vcpu, + vcpu->arch.apic_base | MSR_IA32_APICBASE_BSP); vcpu->arch.pv_eoi.msr_val = 0; apic_update_ppr(apic); @@ -1196,45 +1379,34 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu) vcpu->arch.apic_base, apic->base_address); } -bool kvm_apic_present(struct kvm_vcpu *vcpu) -{ - return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic); -} - -int kvm_lapic_enabled(struct kvm_vcpu *vcpu) -{ - return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic); -} - /* *---------------------------------------------------------------------- * timer interface *---------------------------------------------------------------------- */ -static bool lapic_is_periodic(struct kvm_timer *ktimer) +static bool lapic_is_periodic(struct kvm_lapic *apic) { - struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, - lapic_timer); return apic_lvtt_period(apic); } int apic_has_pending_timer(struct kvm_vcpu *vcpu) { - struct kvm_lapic *lapic = vcpu->arch.apic; + struct kvm_lapic *apic = vcpu->arch.apic; - if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT)) - return atomic_read(&lapic->lapic_timer.pending); + if (kvm_vcpu_has_lapic(vcpu) && apic_enabled(apic) && + apic_lvt_enabled(apic, APIC_LVTT)) + return atomic_read(&apic->lapic_timer.pending); return 0; } int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type) { - u32 reg = apic_get_reg(apic, lvt_type); + u32 reg = kvm_apic_get_reg(apic, lvt_type); int vector, mode, trig_mode; - if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) { + if (kvm_apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) { vector = reg & APIC_VECTOR_MASK; mode = reg & APIC_MODE_MASK; trig_mode = reg & APIC_LVT_LEVEL_TRIGGER; @@ -1251,15 +1423,40 @@ void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu) kvm_apic_local_deliver(apic, APIC_LVT0); } -static struct kvm_timer_ops lapic_timer_ops = { - .is_periodic = lapic_is_periodic, -}; - static const struct kvm_io_device_ops apic_mmio_ops = { .read = apic_mmio_read, .write = apic_mmio_write, }; +static enum hrtimer_restart apic_timer_fn(struct hrtimer *data) +{ + struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer); + struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, lapic_timer); + struct kvm_vcpu *vcpu = apic->vcpu; + wait_queue_head_t *q = &vcpu->wq; + + /* + * There is a race window between reading and incrementing, but we do + * not care about potentially losing timer events in the !reinject + * case anyway. Note: KVM_REQ_PENDING_TIMER is implicitly checked + * in vcpu_enter_guest. + */ + if (!atomic_read(&ktimer->pending)) { + atomic_inc(&ktimer->pending); + /* FIXME: this code should not know anything about vcpus */ + kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu); + } + + if (waitqueue_active(q)) + wake_up_interruptible(q); + + if (lapic_is_periodic(apic)) { + hrtimer_add_expires_ns(&ktimer->timer, ktimer->period); + return HRTIMER_RESTART; + } else + return HRTIMER_NORESTART; +} + int kvm_create_lapic(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic; @@ -1283,14 +1480,17 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu) hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); - apic->lapic_timer.timer.function = kvm_timer_fn; - apic->lapic_timer.t_ops = &lapic_timer_ops; - apic->lapic_timer.kvm = vcpu->kvm; - apic->lapic_timer.vcpu = vcpu; + apic->lapic_timer.timer.function = apic_timer_fn; - apic->base_address = APIC_DEFAULT_PHYS_BASE; - vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE; + /* + * APIC is created enabled. This will prevent kvm_lapic_set_base from + * thinking that APIC satet has changed. + */ + vcpu->arch.apic_base = MSR_IA32_APICBASE_ENABLE; + kvm_lapic_set_base(vcpu, + APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE); + static_key_slow_inc(&apic_sw_disabled.key); /* sw disabled at reset */ kvm_lapic_reset(vcpu); kvm_iodevice_init(&apic->dev, &apic_mmio_ops); @@ -1306,23 +1506,23 @@ int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu) struct kvm_lapic *apic = vcpu->arch.apic; int highest_irr; - if (!apic || !apic_enabled(apic)) + if (!kvm_vcpu_has_lapic(vcpu) || !apic_enabled(apic)) return -1; apic_update_ppr(apic); highest_irr = apic_find_highest_irr(apic); if ((highest_irr == -1) || - ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI))) + ((highest_irr & 0xF0) <= kvm_apic_get_reg(apic, APIC_PROCPRI))) return -1; return highest_irr; } int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu) { - u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0); + u32 lvt0 = kvm_apic_get_reg(vcpu->arch.apic, APIC_LVT0); int r = 0; - if (!apic_hw_enabled(vcpu->arch.apic)) + if (!kvm_apic_hw_enabled(vcpu->arch.apic)) r = 1; if ((lvt0 & APIC_LVT_MASKED) == 0 && GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT) @@ -1334,7 +1534,10 @@ void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic = vcpu->arch.apic; - if (apic && atomic_read(&apic->lapic_timer.pending) > 0) { + if (!kvm_vcpu_has_lapic(vcpu)) + return; + + if (atomic_read(&apic->lapic_timer.pending) > 0) { if (kvm_apic_local_deliver(apic, APIC_LVTT)) atomic_dec(&apic->lapic_timer.pending); } @@ -1354,12 +1557,17 @@ int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu) return vector; } -void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu) +void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu, + struct kvm_lapic_state *s) { struct kvm_lapic *apic = vcpu->arch.apic; - apic->base_address = vcpu->arch.apic_base & - MSR_IA32_APICBASE_BASE; + kvm_lapic_set_base(vcpu, vcpu->arch.apic_base); + /* set SPIV separately to get count of SW disabled APICs right */ + apic_set_spiv(apic, *((u32 *)(s->regs + APIC_SPIV))); + memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s); + /* call kvm_apic_set_id() to put apic into apic_map */ + kvm_apic_set_id(apic, kvm_apic_id(apic)); kvm_apic_set_version(vcpu); apic_update_ppr(apic); @@ -1374,13 +1582,12 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu) void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu) { - struct kvm_lapic *apic = vcpu->arch.apic; struct hrtimer *timer; - if (!apic) + if (!kvm_vcpu_has_lapic(vcpu)) return; - timer = &apic->lapic_timer.timer; + timer = &vcpu->arch.apic->lapic_timer.timer; if (hrtimer_cancel(timer)) hrtimer_start_expires(timer, HRTIMER_MODE_ABS); } @@ -1478,7 +1685,7 @@ void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu) if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention)) return; - tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff; + tpr = kvm_apic_get_reg(apic, APIC_TASKPRI) & 0xff; max_irr = apic_find_highest_irr(apic); if (max_irr < 0) max_irr = 0; @@ -1537,7 +1744,7 @@ int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!irqchip_in_kernel(vcpu->kvm)) + if (!kvm_vcpu_has_lapic(vcpu)) return 1; /* if this is ICR write vector before command */ @@ -1551,7 +1758,7 @@ int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data) struct kvm_lapic *apic = vcpu->arch.apic; u32 low, high = 0; - if (!irqchip_in_kernel(vcpu->kvm)) + if (!kvm_vcpu_has_lapic(vcpu)) return 1; if (apic_reg_read(apic, reg, 4, &low)) @@ -1576,3 +1783,10 @@ int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data) return kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.pv_eoi.data, addr); } + +void kvm_lapic_init(void) +{ + /* do not patch jump label more than once per second */ + jump_label_rate_limit(&apic_hw_disabled, HZ); + jump_label_rate_limit(&apic_sw_disabled, HZ); +} diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h index 4af5405ae1e2..e5ebf9f3571f 100644 --- a/arch/x86/kvm/lapic.h +++ b/arch/x86/kvm/lapic.h @@ -2,10 +2,17 @@ #define __KVM_X86_LAPIC_H #include "iodev.h" -#include "kvm_timer.h" #include <linux/kvm_host.h> +struct kvm_timer { + struct hrtimer timer; + s64 period; /* unit: ns */ + u32 timer_mode_mask; + u64 tscdeadline; + atomic_t pending; /* accumulated triggered timers */ +}; + struct kvm_lapic { unsigned long base_address; struct kvm_io_device dev; @@ -45,11 +52,13 @@ int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda); int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq); int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type); +bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, + struct kvm_lapic_irq *irq, int *r); + u64 kvm_get_apic_base(struct kvm_vcpu *vcpu); void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data); -void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu); -int kvm_lapic_enabled(struct kvm_vcpu *vcpu); -bool kvm_apic_present(struct kvm_vcpu *vcpu); +void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu, + struct kvm_lapic_state *s); int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu); u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu); @@ -71,4 +80,48 @@ static inline bool kvm_hv_vapic_assist_page_enabled(struct kvm_vcpu *vcpu) } int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data); +void kvm_lapic_init(void); + +static inline u32 kvm_apic_get_reg(struct kvm_lapic *apic, int reg_off) +{ + return *((u32 *) (apic->regs + reg_off)); +} + +extern struct static_key kvm_no_apic_vcpu; + +static inline bool kvm_vcpu_has_lapic(struct kvm_vcpu *vcpu) +{ + if (static_key_false(&kvm_no_apic_vcpu)) + return vcpu->arch.apic; + return true; +} + +extern struct static_key_deferred apic_hw_disabled; + +static inline int kvm_apic_hw_enabled(struct kvm_lapic *apic) +{ + if (static_key_false(&apic_hw_disabled.key)) + return apic->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE; + return MSR_IA32_APICBASE_ENABLE; +} + +extern struct static_key_deferred apic_sw_disabled; + +static inline int kvm_apic_sw_enabled(struct kvm_lapic *apic) +{ + if (static_key_false(&apic_sw_disabled.key)) + return kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED; + return APIC_SPIV_APIC_ENABLED; +} + +static inline bool kvm_apic_present(struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_has_lapic(vcpu) && kvm_apic_hw_enabled(vcpu->arch.apic); +} + +static inline int kvm_lapic_enabled(struct kvm_vcpu *vcpu) +{ + return kvm_apic_present(vcpu) && kvm_apic_sw_enabled(vcpu->arch.apic); +} + #endif diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 7fbd0d273ea8..d289fee1ffb8 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -556,6 +556,14 @@ static int mmu_spte_clear_track_bits(u64 *sptep) return 0; pfn = spte_to_pfn(old_spte); + + /* + * KVM does not hold the refcount of the page used by + * kvm mmu, before reclaiming the page, we should + * unmap it from mmu first. + */ + WARN_ON(!kvm_is_mmio_pfn(pfn) && !page_count(pfn_to_page(pfn))); + if (!shadow_accessed_mask || old_spte & shadow_accessed_mask) kvm_set_pfn_accessed(pfn); if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask)) @@ -960,13 +968,10 @@ static void pte_list_walk(unsigned long *pte_list, pte_list_walk_fn fn) static unsigned long *__gfn_to_rmap(gfn_t gfn, int level, struct kvm_memory_slot *slot) { - struct kvm_lpage_info *linfo; - - if (likely(level == PT_PAGE_TABLE_LEVEL)) - return &slot->rmap[gfn - slot->base_gfn]; + unsigned long idx; - linfo = lpage_info_slot(gfn, slot, level); - return &linfo->rmap_pde; + idx = gfn_to_index(gfn, slot->base_gfn, level); + return &slot->arch.rmap[level - PT_PAGE_TABLE_LEVEL][idx]; } /* @@ -1173,7 +1178,8 @@ void kvm_mmu_write_protect_pt_masked(struct kvm *kvm, unsigned long *rmapp; while (mask) { - rmapp = &slot->rmap[gfn_offset + __ffs(mask)]; + rmapp = __gfn_to_rmap(slot->base_gfn + gfn_offset + __ffs(mask), + PT_PAGE_TABLE_LEVEL, slot); __rmap_write_protect(kvm, rmapp, PT_PAGE_TABLE_LEVEL, false); /* clear the first set bit */ @@ -1200,7 +1206,7 @@ static bool rmap_write_protect(struct kvm *kvm, u64 gfn) } static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, - unsigned long data) + struct kvm_memory_slot *slot, unsigned long data) { u64 *sptep; struct rmap_iterator iter; @@ -1218,7 +1224,7 @@ static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, } static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, - unsigned long data) + struct kvm_memory_slot *slot, unsigned long data) { u64 *sptep; struct rmap_iterator iter; @@ -1259,43 +1265,67 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, return 0; } -static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, - unsigned long data, - int (*handler)(struct kvm *kvm, unsigned long *rmapp, - unsigned long data)) +static int kvm_handle_hva_range(struct kvm *kvm, + unsigned long start, + unsigned long end, + unsigned long data, + int (*handler)(struct kvm *kvm, + unsigned long *rmapp, + struct kvm_memory_slot *slot, + unsigned long data)) { int j; - int ret; - int retval = 0; + int ret = 0; struct kvm_memslots *slots; struct kvm_memory_slot *memslot; slots = kvm_memslots(kvm); kvm_for_each_memslot(memslot, slots) { - unsigned long start = memslot->userspace_addr; - unsigned long end; + unsigned long hva_start, hva_end; + gfn_t gfn_start, gfn_end; - end = start + (memslot->npages << PAGE_SHIFT); - if (hva >= start && hva < end) { - gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT; - gfn_t gfn = memslot->base_gfn + gfn_offset; + hva_start = max(start, memslot->userspace_addr); + hva_end = min(end, memslot->userspace_addr + + (memslot->npages << PAGE_SHIFT)); + if (hva_start >= hva_end) + continue; + /* + * {gfn(page) | page intersects with [hva_start, hva_end)} = + * {gfn_start, gfn_start+1, ..., gfn_end-1}. + */ + gfn_start = hva_to_gfn_memslot(hva_start, memslot); + gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); - ret = handler(kvm, &memslot->rmap[gfn_offset], data); + for (j = PT_PAGE_TABLE_LEVEL; + j < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++j) { + unsigned long idx, idx_end; + unsigned long *rmapp; - for (j = 0; j < KVM_NR_PAGE_SIZES - 1; ++j) { - struct kvm_lpage_info *linfo; + /* + * {idx(page_j) | page_j intersects with + * [hva_start, hva_end)} = {idx, idx+1, ..., idx_end}. + */ + idx = gfn_to_index(gfn_start, memslot->base_gfn, j); + idx_end = gfn_to_index(gfn_end - 1, memslot->base_gfn, j); - linfo = lpage_info_slot(gfn, memslot, - PT_DIRECTORY_LEVEL + j); - ret |= handler(kvm, &linfo->rmap_pde, data); - } - trace_kvm_age_page(hva, memslot, ret); - retval |= ret; + rmapp = __gfn_to_rmap(gfn_start, j, memslot); + + for (; idx <= idx_end; ++idx) + ret |= handler(kvm, rmapp++, memslot, data); } } - return retval; + return ret; +} + +static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, + unsigned long data, + int (*handler)(struct kvm *kvm, unsigned long *rmapp, + struct kvm_memory_slot *slot, + unsigned long data)) +{ + return kvm_handle_hva_range(kvm, hva, hva + 1, data, handler); } int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) @@ -1303,13 +1333,18 @@ int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) return kvm_handle_hva(kvm, hva, 0, kvm_unmap_rmapp); } +int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end) +{ + return kvm_handle_hva_range(kvm, start, end, 0, kvm_unmap_rmapp); +} + void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) { kvm_handle_hva(kvm, hva, (unsigned long)&pte, kvm_set_pte_rmapp); } static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, - unsigned long data) + struct kvm_memory_slot *slot, unsigned long data) { u64 *sptep; struct rmap_iterator uninitialized_var(iter); @@ -1323,8 +1358,10 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, * This has some overhead, but not as much as the cost of swapping * out actively used pages or breaking up actively used hugepages. */ - if (!shadow_accessed_mask) - return kvm_unmap_rmapp(kvm, rmapp, data); + if (!shadow_accessed_mask) { + young = kvm_unmap_rmapp(kvm, rmapp, slot, data); + goto out; + } for (sptep = rmap_get_first(*rmapp, &iter); sptep; sptep = rmap_get_next(&iter)) { @@ -1336,12 +1373,14 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, (unsigned long *)sptep); } } - +out: + /* @data has hva passed to kvm_age_hva(). */ + trace_kvm_age_page(data, slot, young); return young; } static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, - unsigned long data) + struct kvm_memory_slot *slot, unsigned long data) { u64 *sptep; struct rmap_iterator iter; @@ -1379,13 +1418,13 @@ static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); - kvm_unmap_rmapp(vcpu->kvm, rmapp, 0); + kvm_unmap_rmapp(vcpu->kvm, rmapp, NULL, 0); kvm_flush_remote_tlbs(vcpu->kvm); } int kvm_age_hva(struct kvm *kvm, unsigned long hva) { - return kvm_handle_hva(kvm, hva, 0, kvm_age_rmapp); + return kvm_handle_hva(kvm, hva, hva, kvm_age_rmapp); } int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) @@ -2457,7 +2496,9 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, rmap_recycle(vcpu, sptep, gfn); } } - kvm_release_pfn_clean(pfn); + + if (!is_error_pfn(pfn)) + kvm_release_pfn_clean(pfn); } static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) @@ -2469,17 +2510,12 @@ static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, bool no_dirty_log) { struct kvm_memory_slot *slot; - unsigned long hva; slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log); - if (!slot) { - get_page(fault_page); - return page_to_pfn(fault_page); - } + if (!slot) + return KVM_PFN_ERR_FAULT; - hva = gfn_to_hva_memslot(slot, gfn); - - return hva_to_pfn_atomic(vcpu->kvm, hva); + return gfn_to_pfn_memslot_atomic(slot, gfn); } static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu, @@ -2580,11 +2616,6 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr, iterator.level - 1, 1, ACC_ALL, iterator.sptep); - if (!sp) { - pgprintk("nonpaging_map: ENOMEM\n"); - kvm_release_pfn_clean(pfn); - return -ENOMEM; - } mmu_spte_set(iterator.sptep, __pa(sp->spt) @@ -2611,8 +2642,16 @@ static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct * static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, pfn_t pfn) { - kvm_release_pfn_clean(pfn); - if (is_hwpoison_pfn(pfn)) { + /* + * Do not cache the mmio info caused by writing the readonly gfn + * into the spte otherwise read access on readonly gfn also can + * caused mmio page fault and treat it as mmio access. + * Return 1 to tell kvm to emulate it. + */ + if (pfn == KVM_PFN_ERR_RO_FAULT) + return 1; + + if (pfn == KVM_PFN_ERR_HWPOISON) { kvm_send_hwpoison_signal(gfn_to_hva(vcpu->kvm, gfn), current); return 0; } @@ -3236,8 +3275,6 @@ static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, if (!async) return false; /* *pfn has correct page already */ - put_page(pfn_to_page(*pfn)); - if (!prefault && can_do_async_pf(vcpu)) { trace_kvm_try_async_get_page(gva, gfn); if (kvm_find_async_pf_gfn(vcpu, gfn)) { @@ -3371,6 +3408,18 @@ static bool is_rsvd_bits_set(struct kvm_mmu *mmu, u64 gpte, int level) return (gpte & mmu->rsvd_bits_mask[bit7][level-1]) != 0; } +static inline void protect_clean_gpte(unsigned *access, unsigned gpte) +{ + unsigned mask; + + BUILD_BUG_ON(PT_WRITABLE_MASK != ACC_WRITE_MASK); + + mask = (unsigned)~ACC_WRITE_MASK; + /* Allow write access to dirty gptes */ + mask |= (gpte >> (PT_DIRTY_SHIFT - PT_WRITABLE_SHIFT)) & PT_WRITABLE_MASK; + *access &= mask; +} + static bool sync_mmio_spte(u64 *sptep, gfn_t gfn, unsigned access, int *nr_present) { @@ -3388,6 +3437,25 @@ static bool sync_mmio_spte(u64 *sptep, gfn_t gfn, unsigned access, return false; } +static inline unsigned gpte_access(struct kvm_vcpu *vcpu, u64 gpte) +{ + unsigned access; + + access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK; + access &= ~(gpte >> PT64_NX_SHIFT); + + return access; +} + +static inline bool is_last_gpte(struct kvm_mmu *mmu, unsigned level, unsigned gpte) +{ + unsigned index; + + index = level - 1; + index |= (gpte & PT_PAGE_SIZE_MASK) >> (PT_PAGE_SIZE_SHIFT - 2); + return mmu->last_pte_bitmap & (1 << index); +} + #define PTTYPE 64 #include "paging_tmpl.h" #undef PTTYPE @@ -3457,6 +3525,56 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, } } +static void update_permission_bitmask(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu) +{ + unsigned bit, byte, pfec; + u8 map; + bool fault, x, w, u, wf, uf, ff, smep; + + smep = kvm_read_cr4_bits(vcpu, X86_CR4_SMEP); + for (byte = 0; byte < ARRAY_SIZE(mmu->permissions); ++byte) { + pfec = byte << 1; + map = 0; + wf = pfec & PFERR_WRITE_MASK; + uf = pfec & PFERR_USER_MASK; + ff = pfec & PFERR_FETCH_MASK; + for (bit = 0; bit < 8; ++bit) { + x = bit & ACC_EXEC_MASK; + w = bit & ACC_WRITE_MASK; + u = bit & ACC_USER_MASK; + + /* Not really needed: !nx will cause pte.nx to fault */ + x |= !mmu->nx; + /* Allow supervisor writes if !cr0.wp */ + w |= !is_write_protection(vcpu) && !uf; + /* Disallow supervisor fetches of user code if cr4.smep */ + x &= !(smep && u && !uf); + + fault = (ff && !x) || (uf && !u) || (wf && !w); + map |= fault << bit; + } + mmu->permissions[byte] = map; + } +} + +static void update_last_pte_bitmap(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu) +{ + u8 map; + unsigned level, root_level = mmu->root_level; + const unsigned ps_set_index = 1 << 2; /* bit 2 of index: ps */ + + if (root_level == PT32E_ROOT_LEVEL) + --root_level; + /* PT_PAGE_TABLE_LEVEL always terminates */ + map = 1 | (1 << ps_set_index); + for (level = PT_DIRECTORY_LEVEL; level <= root_level; ++level) { + if (level <= PT_PDPE_LEVEL + && (mmu->root_level >= PT32E_ROOT_LEVEL || is_pse(vcpu))) + map |= 1 << (ps_set_index | (level - 1)); + } + mmu->last_pte_bitmap = map; +} + static int paging64_init_context_common(struct kvm_vcpu *vcpu, struct kvm_mmu *context, int level) @@ -3465,6 +3583,8 @@ static int paging64_init_context_common(struct kvm_vcpu *vcpu, context->root_level = level; reset_rsvds_bits_mask(vcpu, context); + update_permission_bitmask(vcpu, context); + update_last_pte_bitmap(vcpu, context); ASSERT(is_pae(vcpu)); context->new_cr3 = paging_new_cr3; @@ -3493,6 +3613,8 @@ static int paging32_init_context(struct kvm_vcpu *vcpu, context->root_level = PT32_ROOT_LEVEL; reset_rsvds_bits_mask(vcpu, context); + update_permission_bitmask(vcpu, context); + update_last_pte_bitmap(vcpu, context); context->new_cr3 = paging_new_cr3; context->page_fault = paging32_page_fault; @@ -3553,6 +3675,9 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) context->gva_to_gpa = paging32_gva_to_gpa; } + update_permission_bitmask(vcpu, context); + update_last_pte_bitmap(vcpu, context); + return 0; } @@ -3628,6 +3753,9 @@ static int init_kvm_nested_mmu(struct kvm_vcpu *vcpu) g_context->gva_to_gpa = paging32_gva_to_gpa_nested; } + update_permission_bitmask(vcpu, g_context); + update_last_pte_bitmap(vcpu, g_context); + return 0; } diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index e374db9af021..69871080e866 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -18,8 +18,10 @@ #define PT_PCD_MASK (1ULL << 4) #define PT_ACCESSED_SHIFT 5 #define PT_ACCESSED_MASK (1ULL << PT_ACCESSED_SHIFT) -#define PT_DIRTY_MASK (1ULL << 6) -#define PT_PAGE_SIZE_MASK (1ULL << 7) +#define PT_DIRTY_SHIFT 6 +#define PT_DIRTY_MASK (1ULL << PT_DIRTY_SHIFT) +#define PT_PAGE_SIZE_SHIFT 7 +#define PT_PAGE_SIZE_MASK (1ULL << PT_PAGE_SIZE_SHIFT) #define PT_PAT_MASK (1ULL << 7) #define PT_GLOBAL_MASK (1ULL << 8) #define PT64_NX_SHIFT 63 @@ -88,17 +90,14 @@ static inline bool is_write_protection(struct kvm_vcpu *vcpu) return kvm_read_cr0_bits(vcpu, X86_CR0_WP); } -static inline bool check_write_user_access(struct kvm_vcpu *vcpu, - bool write_fault, bool user_fault, - unsigned long pte) +/* + * Will a fault with a given page-fault error code (pfec) cause a permission + * fault with the given access (in ACC_* format)? + */ +static inline bool permission_fault(struct kvm_mmu *mmu, unsigned pte_access, + unsigned pfec) { - if (unlikely(write_fault && !is_writable_pte(pte) - && (user_fault || is_write_protection(vcpu)))) - return false; - - if (unlikely(user_fault && !(pte & PT_USER_MASK))) - return false; - - return true; + return (mmu->permissions[pfec >> 1] >> pte_access) & 1; } + #endif diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c index 7d7d0b9e23eb..daff69e21150 100644 --- a/arch/x86/kvm/mmu_audit.c +++ b/arch/x86/kvm/mmu_audit.c @@ -116,10 +116,8 @@ static void audit_mappings(struct kvm_vcpu *vcpu, u64 *sptep, int level) gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt); pfn = gfn_to_pfn_atomic(vcpu->kvm, gfn); - if (is_error_pfn(pfn)) { - kvm_release_pfn_clean(pfn); + if (is_error_pfn(pfn)) return; - } hpa = pfn << PAGE_SHIFT; if ((*sptep & PT64_BASE_ADDR_MASK) != hpa) @@ -190,7 +188,6 @@ static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp) static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp) { - struct kvm_memory_slot *slot; unsigned long *rmapp; u64 *sptep; struct rmap_iterator iter; @@ -198,8 +195,7 @@ static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp) if (sp->role.direct || sp->unsync || sp->role.invalid) return; - slot = gfn_to_memslot(kvm, sp->gfn); - rmapp = &slot->rmap[sp->gfn - slot->base_gfn]; + rmapp = gfn_to_rmap(kvm, sp->gfn, PT_PAGE_TABLE_LEVEL); for (sptep = rmap_get_first(*rmapp, &iter); sptep; sptep = rmap_get_next(&iter)) { diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index bb7cf01cae76..714e2c01a6fe 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -63,10 +63,12 @@ */ struct guest_walker { int level; + unsigned max_level; gfn_t table_gfn[PT_MAX_FULL_LEVELS]; pt_element_t ptes[PT_MAX_FULL_LEVELS]; pt_element_t prefetch_ptes[PTE_PREFETCH_NUM]; gpa_t pte_gpa[PT_MAX_FULL_LEVELS]; + pt_element_t __user *ptep_user[PT_MAX_FULL_LEVELS]; unsigned pt_access; unsigned pte_access; gfn_t gfn; @@ -101,38 +103,41 @@ static int FNAME(cmpxchg_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, return (ret != orig_pte); } -static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte, - bool last) +static int FNAME(update_accessed_dirty_bits)(struct kvm_vcpu *vcpu, + struct kvm_mmu *mmu, + struct guest_walker *walker, + int write_fault) { - unsigned access; - - access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK; - if (last && !is_dirty_gpte(gpte)) - access &= ~ACC_WRITE_MASK; - -#if PTTYPE == 64 - if (vcpu->arch.mmu.nx) - access &= ~(gpte >> PT64_NX_SHIFT); -#endif - return access; -} - -static bool FNAME(is_last_gpte)(struct guest_walker *walker, - struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, - pt_element_t gpte) -{ - if (walker->level == PT_PAGE_TABLE_LEVEL) - return true; - - if ((walker->level == PT_DIRECTORY_LEVEL) && is_large_pte(gpte) && - (PTTYPE == 64 || is_pse(vcpu))) - return true; + unsigned level, index; + pt_element_t pte, orig_pte; + pt_element_t __user *ptep_user; + gfn_t table_gfn; + int ret; + + for (level = walker->max_level; level >= walker->level; --level) { + pte = orig_pte = walker->ptes[level - 1]; + table_gfn = walker->table_gfn[level - 1]; + ptep_user = walker->ptep_user[level - 1]; + index = offset_in_page(ptep_user) / sizeof(pt_element_t); + if (!(pte & PT_ACCESSED_MASK)) { + trace_kvm_mmu_set_accessed_bit(table_gfn, index, sizeof(pte)); + pte |= PT_ACCESSED_MASK; + } + if (level == walker->level && write_fault && !is_dirty_gpte(pte)) { + trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte)); + pte |= PT_DIRTY_MASK; + } + if (pte == orig_pte) + continue; - if ((walker->level == PT_PDPE_LEVEL) && is_large_pte(gpte) && - (mmu->root_level == PT64_ROOT_LEVEL)) - return true; + ret = FNAME(cmpxchg_gpte)(vcpu, mmu, ptep_user, index, orig_pte, pte); + if (ret) + return ret; - return false; + mark_page_dirty(vcpu->kvm, table_gfn); + walker->ptes[level] = pte; + } + return 0; } /* @@ -142,21 +147,22 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, gva_t addr, u32 access) { + int ret; pt_element_t pte; pt_element_t __user *uninitialized_var(ptep_user); gfn_t table_gfn; - unsigned index, pt_access, uninitialized_var(pte_access); + unsigned index, pt_access, pte_access, accessed_dirty, shift; gpa_t pte_gpa; - bool eperm, last_gpte; int offset; const int write_fault = access & PFERR_WRITE_MASK; const int user_fault = access & PFERR_USER_MASK; const int fetch_fault = access & PFERR_FETCH_MASK; u16 errcode = 0; + gpa_t real_gpa; + gfn_t gfn; trace_kvm_mmu_pagetable_walk(addr, access); retry_walk: - eperm = false; walker->level = mmu->root_level; pte = mmu->get_cr3(vcpu); @@ -169,15 +175,21 @@ retry_walk: --walker->level; } #endif + walker->max_level = walker->level; ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) || (mmu->get_cr3(vcpu) & CR3_NONPAE_RESERVED_BITS) == 0); - pt_access = ACC_ALL; + accessed_dirty = PT_ACCESSED_MASK; + pt_access = pte_access = ACC_ALL; + ++walker->level; - for (;;) { + do { gfn_t real_gfn; unsigned long host_addr; + pt_access &= pte_access; + --walker->level; + index = PT_INDEX(addr, walker->level); table_gfn = gpte_to_gfn(pte); @@ -199,6 +211,7 @@ retry_walk: ptep_user = (pt_element_t __user *)((void *)host_addr + offset); if (unlikely(__copy_from_user(&pte, ptep_user, sizeof(pte)))) goto error; + walker->ptep_user[walker->level - 1] = ptep_user; trace_kvm_mmu_paging_element(pte, walker->level); @@ -211,92 +224,48 @@ retry_walk: goto error; } - if (!check_write_user_access(vcpu, write_fault, user_fault, - pte)) - eperm = true; - -#if PTTYPE == 64 - if (unlikely(fetch_fault && (pte & PT64_NX_MASK))) - eperm = true; -#endif - - last_gpte = FNAME(is_last_gpte)(walker, vcpu, mmu, pte); - if (last_gpte) { - pte_access = pt_access & - FNAME(gpte_access)(vcpu, pte, true); - /* check if the kernel is fetching from user page */ - if (unlikely(pte_access & PT_USER_MASK) && - kvm_read_cr4_bits(vcpu, X86_CR4_SMEP)) - if (fetch_fault && !user_fault) - eperm = true; - } - - if (!eperm && unlikely(!(pte & PT_ACCESSED_MASK))) { - int ret; - trace_kvm_mmu_set_accessed_bit(table_gfn, index, - sizeof(pte)); - ret = FNAME(cmpxchg_gpte)(vcpu, mmu, ptep_user, index, - pte, pte|PT_ACCESSED_MASK); - if (unlikely(ret < 0)) - goto error; - else if (ret) - goto retry_walk; - - mark_page_dirty(vcpu->kvm, table_gfn); - pte |= PT_ACCESSED_MASK; - } + accessed_dirty &= pte; + pte_access = pt_access & gpte_access(vcpu, pte); walker->ptes[walker->level - 1] = pte; + } while (!is_last_gpte(mmu, walker->level, pte)); - if (last_gpte) { - int lvl = walker->level; - gpa_t real_gpa; - gfn_t gfn; - u32 ac; - - gfn = gpte_to_gfn_lvl(pte, lvl); - gfn += (addr & PT_LVL_OFFSET_MASK(lvl)) >> PAGE_SHIFT; - - if (PTTYPE == 32 && - walker->level == PT_DIRECTORY_LEVEL && - is_cpuid_PSE36()) - gfn += pse36_gfn_delta(pte); - - ac = write_fault | fetch_fault | user_fault; + if (unlikely(permission_fault(mmu, pte_access, access))) { + errcode |= PFERR_PRESENT_MASK; + goto error; + } - real_gpa = mmu->translate_gpa(vcpu, gfn_to_gpa(gfn), - ac); - if (real_gpa == UNMAPPED_GVA) - return 0; + gfn = gpte_to_gfn_lvl(pte, walker->level); + gfn += (addr & PT_LVL_OFFSET_MASK(walker->level)) >> PAGE_SHIFT; - walker->gfn = real_gpa >> PAGE_SHIFT; + if (PTTYPE == 32 && walker->level == PT_DIRECTORY_LEVEL && is_cpuid_PSE36()) + gfn += pse36_gfn_delta(pte); - break; - } + real_gpa = mmu->translate_gpa(vcpu, gfn_to_gpa(gfn), access); + if (real_gpa == UNMAPPED_GVA) + return 0; - pt_access &= FNAME(gpte_access)(vcpu, pte, false); - --walker->level; - } + walker->gfn = real_gpa >> PAGE_SHIFT; - if (unlikely(eperm)) { - errcode |= PFERR_PRESENT_MASK; - goto error; - } + if (!write_fault) + protect_clean_gpte(&pte_access, pte); - if (write_fault && unlikely(!is_dirty_gpte(pte))) { - int ret; + /* + * On a write fault, fold the dirty bit into accessed_dirty by shifting it one + * place right. + * + * On a read fault, do nothing. + */ + shift = write_fault >> ilog2(PFERR_WRITE_MASK); + shift *= PT_DIRTY_SHIFT - PT_ACCESSED_SHIFT; + accessed_dirty &= pte >> shift; - trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte)); - ret = FNAME(cmpxchg_gpte)(vcpu, mmu, ptep_user, index, - pte, pte|PT_DIRTY_MASK); + if (unlikely(!accessed_dirty)) { + ret = FNAME(update_accessed_dirty_bits)(vcpu, mmu, walker, write_fault); if (unlikely(ret < 0)) goto error; else if (ret) goto retry_walk; - - mark_page_dirty(vcpu->kvm, table_gfn); - pte |= PT_DIRTY_MASK; - walker->ptes[walker->level - 1] = pte; } walker->pt_access = pt_access; @@ -368,12 +337,11 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, return; pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte); - pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte, true); + pte_access = sp->role.access & gpte_access(vcpu, gpte); + protect_clean_gpte(&pte_access, gpte); pfn = gfn_to_pfn_atomic(vcpu->kvm, gpte_to_gfn(gpte)); - if (mmu_invalid_pfn(pfn)) { - kvm_release_pfn_clean(pfn); + if (mmu_invalid_pfn(pfn)) return; - } /* * we call mmu_set_spte() with host_writable = true because that @@ -443,15 +411,13 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw, if (FNAME(prefetch_invalid_gpte)(vcpu, sp, spte, gpte)) continue; - pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte, - true); + pte_access = sp->role.access & gpte_access(vcpu, gpte); + protect_clean_gpte(&pte_access, gpte); gfn = gpte_to_gfn(gpte); pfn = pte_prefetch_gfn_to_pfn(vcpu, gfn, pte_access & ACC_WRITE_MASK); - if (mmu_invalid_pfn(pfn)) { - kvm_release_pfn_clean(pfn); + if (mmu_invalid_pfn(pfn)) break; - } mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0, NULL, PT_PAGE_TABLE_LEVEL, gfn, @@ -798,7 +764,8 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) gfn = gpte_to_gfn(gpte); pte_access = sp->role.access; - pte_access &= FNAME(gpte_access)(vcpu, gpte, true); + pte_access &= gpte_access(vcpu, gpte); + protect_clean_gpte(&pte_access, gpte); if (sync_mmio_spte(&sp->spt[i], gfn, pte_access, &nr_present)) continue; diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 9b7ec1150ab0..cfc258a6bf97 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -1,5 +1,5 @@ /* - * Kernel-based Virtual Machine -- Performane Monitoring Unit support + * Kernel-based Virtual Machine -- Performance Monitoring Unit support * * Copyright 2011 Red Hat, Inc. and/or its affiliates. * diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index baead950d6c8..d017df3899ef 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -163,7 +163,7 @@ static DEFINE_PER_CPU(u64, current_tsc_ratio); #define MSR_INVALID 0xffffffffU -static struct svm_direct_access_msrs { +static const struct svm_direct_access_msrs { u32 index; /* Index of the MSR */ bool always; /* True if intercept is always on */ } direct_access_msrs[] = { @@ -400,7 +400,7 @@ struct svm_init_data { int r; }; -static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000}; +static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000}; #define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges) #define MSRS_RANGE_SIZE 2048 @@ -1146,7 +1146,6 @@ static void init_vmcb(struct vcpu_svm *svm) svm_set_efer(&svm->vcpu, 0); save->dr6 = 0xffff0ff0; - save->dr7 = 0x400; kvm_set_rflags(&svm->vcpu, 2); save->rip = 0x0000fff0; svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip; @@ -1643,7 +1642,7 @@ static void svm_set_segment(struct kvm_vcpu *vcpu, mark_dirty(svm->vmcb, VMCB_SEG); } -static void update_db_intercept(struct kvm_vcpu *vcpu) +static void update_db_bp_intercept(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); @@ -1663,20 +1662,6 @@ static void update_db_intercept(struct kvm_vcpu *vcpu) vcpu->guest_debug = 0; } -static void svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) -{ - struct vcpu_svm *svm = to_svm(vcpu); - - if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) - svm->vmcb->save.dr7 = dbg->arch.debugreg[7]; - else - svm->vmcb->save.dr7 = vcpu->arch.dr7; - - mark_dirty(svm->vmcb, VMCB_DR); - - update_db_intercept(vcpu); -} - static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd) { if (sd->next_asid > sd->max_asid) { @@ -1748,7 +1733,7 @@ static int db_interception(struct vcpu_svm *svm) if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) svm->vmcb->save.rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF); - update_db_intercept(&svm->vcpu); + update_db_bp_intercept(&svm->vcpu); } if (svm->vcpu.guest_debug & @@ -2063,7 +2048,7 @@ static inline bool nested_svm_intr(struct vcpu_svm *svm) if (svm->nested.intercept & 1ULL) { /* * The #vmexit can't be emulated here directly because this - * code path runs with irqs and preemtion disabled. A + * code path runs with irqs and preemption disabled. A * #vmexit emulation might sleep. Only signal request for * the #vmexit here. */ @@ -2105,7 +2090,6 @@ static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page) return kmap(page); error: - kvm_release_page_clean(page); kvm_inject_gp(&svm->vcpu, 0); return NULL; @@ -2409,7 +2393,7 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) { /* * This function merges the msr permission bitmaps of kvm and the - * nested vmcb. It is omptimized in that it only merges the parts where + * nested vmcb. It is optimized in that it only merges the parts where * the kvm msr permission bitmap may contain zero bits */ int i; @@ -3268,7 +3252,7 @@ static int pause_interception(struct vcpu_svm *svm) return 1; } -static int (*svm_exit_handlers[])(struct vcpu_svm *svm) = { +static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = { [SVM_EXIT_READ_CR0] = cr_interception, [SVM_EXIT_READ_CR3] = cr_interception, [SVM_EXIT_READ_CR4] = cr_interception, @@ -3660,7 +3644,7 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu) */ svm->nmi_singlestep = true; svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); - update_db_intercept(vcpu); + update_db_bp_intercept(vcpu); } static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr) @@ -3783,12 +3767,6 @@ static void svm_cancel_injection(struct kvm_vcpu *vcpu) svm_complete_interrupts(svm); } -#ifdef CONFIG_X86_64 -#define R "r" -#else -#define R "e" -#endif - static void svm_vcpu_run(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); @@ -3815,13 +3793,13 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) local_irq_enable(); asm volatile ( - "push %%"R"bp; \n\t" - "mov %c[rbx](%[svm]), %%"R"bx \n\t" - "mov %c[rcx](%[svm]), %%"R"cx \n\t" - "mov %c[rdx](%[svm]), %%"R"dx \n\t" - "mov %c[rsi](%[svm]), %%"R"si \n\t" - "mov %c[rdi](%[svm]), %%"R"di \n\t" - "mov %c[rbp](%[svm]), %%"R"bp \n\t" + "push %%" _ASM_BP "; \n\t" + "mov %c[rbx](%[svm]), %%" _ASM_BX " \n\t" + "mov %c[rcx](%[svm]), %%" _ASM_CX " \n\t" + "mov %c[rdx](%[svm]), %%" _ASM_DX " \n\t" + "mov %c[rsi](%[svm]), %%" _ASM_SI " \n\t" + "mov %c[rdi](%[svm]), %%" _ASM_DI " \n\t" + "mov %c[rbp](%[svm]), %%" _ASM_BP " \n\t" #ifdef CONFIG_X86_64 "mov %c[r8](%[svm]), %%r8 \n\t" "mov %c[r9](%[svm]), %%r9 \n\t" @@ -3834,20 +3812,20 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) #endif /* Enter guest mode */ - "push %%"R"ax \n\t" - "mov %c[vmcb](%[svm]), %%"R"ax \n\t" + "push %%" _ASM_AX " \n\t" + "mov %c[vmcb](%[svm]), %%" _ASM_AX " \n\t" __ex(SVM_VMLOAD) "\n\t" __ex(SVM_VMRUN) "\n\t" __ex(SVM_VMSAVE) "\n\t" - "pop %%"R"ax \n\t" + "pop %%" _ASM_AX " \n\t" /* Save guest registers, load host registers */ - "mov %%"R"bx, %c[rbx](%[svm]) \n\t" - "mov %%"R"cx, %c[rcx](%[svm]) \n\t" - "mov %%"R"dx, %c[rdx](%[svm]) \n\t" - "mov %%"R"si, %c[rsi](%[svm]) \n\t" - "mov %%"R"di, %c[rdi](%[svm]) \n\t" - "mov %%"R"bp, %c[rbp](%[svm]) \n\t" + "mov %%" _ASM_BX ", %c[rbx](%[svm]) \n\t" + "mov %%" _ASM_CX ", %c[rcx](%[svm]) \n\t" + "mov %%" _ASM_DX ", %c[rdx](%[svm]) \n\t" + "mov %%" _ASM_SI ", %c[rsi](%[svm]) \n\t" + "mov %%" _ASM_DI ", %c[rdi](%[svm]) \n\t" + "mov %%" _ASM_BP ", %c[rbp](%[svm]) \n\t" #ifdef CONFIG_X86_64 "mov %%r8, %c[r8](%[svm]) \n\t" "mov %%r9, %c[r9](%[svm]) \n\t" @@ -3858,7 +3836,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) "mov %%r14, %c[r14](%[svm]) \n\t" "mov %%r15, %c[r15](%[svm]) \n\t" #endif - "pop %%"R"bp" + "pop %%" _ASM_BP : : [svm]"a"(svm), [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)), @@ -3879,9 +3857,11 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) [r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15])) #endif : "cc", "memory" - , R"bx", R"cx", R"dx", R"si", R"di" #ifdef CONFIG_X86_64 + , "rbx", "rcx", "rdx", "rsi", "rdi" , "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15" +#else + , "ebx", "ecx", "edx", "esi", "edi" #endif ); @@ -3941,8 +3921,6 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) mark_all_clean(svm->vmcb); } -#undef R - static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root) { struct vcpu_svm *svm = to_svm(vcpu); @@ -4069,7 +4047,7 @@ static void svm_fpu_deactivate(struct kvm_vcpu *vcpu) #define POST_MEM(exit) { .exit_code = (exit), \ .stage = X86_ICPT_POST_MEMACCESS, } -static struct __x86_intercept { +static const struct __x86_intercept { u32 exit_code; enum x86_intercept_stage stage; } x86_intercept_map[] = { @@ -4260,7 +4238,7 @@ static struct kvm_x86_ops svm_x86_ops = { .vcpu_load = svm_vcpu_load, .vcpu_put = svm_vcpu_put, - .set_guest_debug = svm_guest_debug, + .update_db_bp_intercept = update_db_bp_intercept, .get_msr = svm_get_msr, .set_msr = svm_set_msr, .get_segment_base = svm_get_segment_base, diff --git a/arch/x86/kvm/timer.c b/arch/x86/kvm/timer.c deleted file mode 100644 index 6b85cc647f34..000000000000 --- a/arch/x86/kvm/timer.c +++ /dev/null @@ -1,47 +0,0 @@ -/* - * Kernel-based Virtual Machine driver for Linux - * - * This module enables machines with Intel VT-x extensions to run virtual - * machines without emulation or binary translation. - * - * timer support - * - * Copyright 2010 Red Hat, Inc. and/or its affiliates. - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - */ - -#include <linux/kvm_host.h> -#include <linux/kvm.h> -#include <linux/hrtimer.h> -#include <linux/atomic.h> -#include "kvm_timer.h" - -enum hrtimer_restart kvm_timer_fn(struct hrtimer *data) -{ - struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer); - struct kvm_vcpu *vcpu = ktimer->vcpu; - wait_queue_head_t *q = &vcpu->wq; - - /* - * There is a race window between reading and incrementing, but we do - * not care about potentially losing timer events in the !reinject - * case anyway. Note: KVM_REQ_PENDING_TIMER is implicitly checked - * in vcpu_enter_guest. - */ - if (ktimer->reinject || !atomic_read(&ktimer->pending)) { - atomic_inc(&ktimer->pending); - /* FIXME: this code should not know anything about vcpus */ - kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu); - } - - if (waitqueue_active(q)) - wake_up_interruptible(q); - - if (ktimer->t_ops->is_periodic(ktimer)) { - hrtimer_add_expires_ns(&ktimer->timer, ktimer->period); - return HRTIMER_RESTART; - } else - return HRTIMER_NORESTART; -} diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 851aa7c3b890..ad6b1dd06f8b 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -127,6 +127,8 @@ module_param(ple_gap, int, S_IRUGO); static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW; module_param(ple_window, int, S_IRUGO); +extern const ulong vmx_return; + #define NR_AUTOLOAD_MSRS 8 #define VMCS02_POOL_SIZE 1 @@ -405,16 +407,16 @@ struct vcpu_vmx { struct { int vm86_active; ulong save_rflags; + struct kvm_segment segs[8]; + } rmode; + struct { + u32 bitmask; /* 4 bits per segment (1 bit per field) */ struct kvm_save_segment { u16 selector; unsigned long base; u32 limit; u32 ar; - } tr, es, ds, fs, gs; - } rmode; - struct { - u32 bitmask; /* 4 bits per segment (1 bit per field) */ - struct kvm_save_segment seg[8]; + } seg[8]; } segment_cache; int vpid; bool emulation_required; @@ -450,7 +452,7 @@ static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu) #define FIELD64(number, name) [number] = VMCS12_OFFSET(name), \ [number##_HIGH] = VMCS12_OFFSET(name)+4 -static unsigned short vmcs_field_to_offset_table[] = { +static const unsigned short vmcs_field_to_offset_table[] = { FIELD(VIRTUAL_PROCESSOR_ID, virtual_processor_id), FIELD(GUEST_ES_SELECTOR, guest_es_selector), FIELD(GUEST_CS_SELECTOR, guest_cs_selector), @@ -596,10 +598,9 @@ static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu) static struct page *nested_get_page(struct kvm_vcpu *vcpu, gpa_t addr) { struct page *page = gfn_to_page(vcpu->kvm, addr >> PAGE_SHIFT); - if (is_error_page(page)) { - kvm_release_page_clean(page); + if (is_error_page(page)) return NULL; - } + return page; } @@ -667,7 +668,7 @@ static struct vmx_capability { .ar_bytes = GUEST_##seg##_AR_BYTES, \ } -static struct kvm_vmx_segment_field { +static const struct kvm_vmx_segment_field { unsigned selector; unsigned base; unsigned limit; @@ -1343,7 +1344,7 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset) guest_efer = vmx->vcpu.arch.efer; /* - * NX is emulated; LMA and LME handled by hardware; SCE meaninless + * NX is emulated; LMA and LME handled by hardware; SCE meaningless * outside long mode */ ignore_bits = EFER_NX | EFER_SCE; @@ -1995,7 +1996,7 @@ static __init void nested_vmx_setup_ctls_msrs(void) #endif CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING | CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_EXITING | - CPU_BASED_RDPMC_EXITING | + CPU_BASED_RDPMC_EXITING | CPU_BASED_RDTSC_EXITING | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; /* * We can allow some features even when not supported by the @@ -2291,16 +2292,6 @@ static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) } } -static void set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) -{ - if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) - vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]); - else - vmcs_writel(GUEST_DR7, vcpu->arch.dr7); - - update_exception_bitmap(vcpu); -} - static __init int cpu_has_kvm_support(void) { return cpu_has_vmx(); @@ -2698,20 +2689,17 @@ static __exit void hardware_unsetup(void) free_kvm_area(); } -static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save) +static void fix_pmode_dataseg(struct kvm_vcpu *vcpu, int seg, struct kvm_segment *save) { - struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; + const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; + struct kvm_segment tmp = *save; - if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) { - vmcs_write16(sf->selector, save->selector); - vmcs_writel(sf->base, save->base); - vmcs_write32(sf->limit, save->limit); - vmcs_write32(sf->ar_bytes, save->ar); - } else { - u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK) - << AR_DPL_SHIFT; - vmcs_write32(sf->ar_bytes, 0x93 | dpl); + if (!(vmcs_readl(sf->base) == tmp.base && tmp.s)) { + tmp.base = vmcs_readl(sf->base); + tmp.selector = vmcs_read16(sf->selector); + tmp.s = 1; } + vmx_set_segment(vcpu, &tmp, seg); } static void enter_pmode(struct kvm_vcpu *vcpu) @@ -2724,10 +2712,7 @@ static void enter_pmode(struct kvm_vcpu *vcpu) vmx_segment_cache_clear(vmx); - vmcs_write16(GUEST_TR_SELECTOR, vmx->rmode.tr.selector); - vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base); - vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit); - vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar); + vmx_set_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR); flags = vmcs_readl(GUEST_RFLAGS); flags &= RMODE_GUEST_OWNED_EFLAGS_BITS; @@ -2742,10 +2727,10 @@ static void enter_pmode(struct kvm_vcpu *vcpu) if (emulate_invalid_guest_state) return; - fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es); - fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds); - fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs); - fix_pmode_dataseg(VCPU_SREG_FS, &vmx->rmode.fs); + fix_pmode_dataseg(vcpu, VCPU_SREG_ES, &vmx->rmode.segs[VCPU_SREG_ES]); + fix_pmode_dataseg(vcpu, VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]); + fix_pmode_dataseg(vcpu, VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]); + fix_pmode_dataseg(vcpu, VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]); vmx_segment_cache_clear(vmx); @@ -2773,14 +2758,10 @@ static gva_t rmode_tss_base(struct kvm *kvm) return kvm->arch.tss_addr; } -static void fix_rmode_seg(int seg, struct kvm_save_segment *save) +static void fix_rmode_seg(int seg, struct kvm_segment *save) { - struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; + const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; - save->selector = vmcs_read16(sf->selector); - save->base = vmcs_readl(sf->base); - save->limit = vmcs_read32(sf->limit); - save->ar = vmcs_read32(sf->ar_bytes); vmcs_write16(sf->selector, save->base >> 4); vmcs_write32(sf->base, save->base & 0xffff0); vmcs_write32(sf->limit, 0xffff); @@ -2800,9 +2781,16 @@ static void enter_rmode(struct kvm_vcpu *vcpu) if (enable_unrestricted_guest) return; + vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR); + vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES); + vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS); + vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_FS], VCPU_SREG_FS); + vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_GS], VCPU_SREG_GS); + vmx->emulation_required = 1; vmx->rmode.vm86_active = 1; + /* * Very old userspace does not call KVM_SET_TSS_ADDR before entering * vcpu. Call it here with phys address pointing 16M below 4G. @@ -2817,14 +2805,8 @@ static void enter_rmode(struct kvm_vcpu *vcpu) vmx_segment_cache_clear(vmx); - vmx->rmode.tr.selector = vmcs_read16(GUEST_TR_SELECTOR); - vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE); vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm)); - - vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT); vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1); - - vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES); vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); flags = vmcs_readl(GUEST_RFLAGS); @@ -3117,35 +3099,24 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { struct vcpu_vmx *vmx = to_vmx(vcpu); - struct kvm_save_segment *save; u32 ar; if (vmx->rmode.vm86_active && (seg == VCPU_SREG_TR || seg == VCPU_SREG_ES || seg == VCPU_SREG_DS || seg == VCPU_SREG_FS - || seg == VCPU_SREG_GS) - && !emulate_invalid_guest_state) { - switch (seg) { - case VCPU_SREG_TR: save = &vmx->rmode.tr; break; - case VCPU_SREG_ES: save = &vmx->rmode.es; break; - case VCPU_SREG_DS: save = &vmx->rmode.ds; break; - case VCPU_SREG_FS: save = &vmx->rmode.fs; break; - case VCPU_SREG_GS: save = &vmx->rmode.gs; break; - default: BUG(); - } - var->selector = save->selector; - var->base = save->base; - var->limit = save->limit; - ar = save->ar; + || seg == VCPU_SREG_GS)) { + *var = vmx->rmode.segs[seg]; if (seg == VCPU_SREG_TR || var->selector == vmx_read_guest_seg_selector(vmx, seg)) - goto use_saved_rmode_seg; + return; + var->base = vmx_read_guest_seg_base(vmx, seg); + var->selector = vmx_read_guest_seg_selector(vmx, seg); + return; } var->base = vmx_read_guest_seg_base(vmx, seg); var->limit = vmx_read_guest_seg_limit(vmx, seg); var->selector = vmx_read_guest_seg_selector(vmx, seg); ar = vmx_read_guest_seg_ar(vmx, seg); -use_saved_rmode_seg: if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state) ar = 0; var->type = ar & 15; @@ -3227,23 +3198,21 @@ static void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg) { struct vcpu_vmx *vmx = to_vmx(vcpu); - struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; + const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; u32 ar; vmx_segment_cache_clear(vmx); if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) { vmcs_write16(sf->selector, var->selector); - vmx->rmode.tr.selector = var->selector; - vmx->rmode.tr.base = var->base; - vmx->rmode.tr.limit = var->limit; - vmx->rmode.tr.ar = vmx_segment_access_rights(var); + vmx->rmode.segs[VCPU_SREG_TR] = *var; return; } vmcs_writel(sf->base, var->base); vmcs_write32(sf->limit, var->limit); vmcs_write16(sf->selector, var->selector); if (vmx->rmode.vm86_active && var->s) { + vmx->rmode.segs[seg] = *var; /* * Hack real-mode segments into vm86 compatibility. */ @@ -3258,7 +3227,7 @@ static void vmx_set_segment(struct kvm_vcpu *vcpu, * qemu binaries. * IA32 arch specifies that at the time of processor reset the * "Accessed" bit in the AR field of segment registers is 1. And qemu - * is setting it to 0 in the usedland code. This causes invalid guest + * is setting it to 0 in the userland code. This causes invalid guest * state vmexit when "unrestricted guest" mode is turned on. * Fix for this setup issue in cpu_reset is being pushed in the qemu * tree. Newer qemu binaries with that qemu fix would not need this @@ -3288,16 +3257,10 @@ static void vmx_set_segment(struct kvm_vcpu *vcpu, vmcs_readl(GUEST_CS_BASE) >> 4); break; case VCPU_SREG_ES: - fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es); - break; case VCPU_SREG_DS: - fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds); - break; case VCPU_SREG_GS: - fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs); - break; case VCPU_SREG_FS: - fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs); + fix_rmode_seg(seg, &vmx->rmode.segs[seg]); break; case VCPU_SREG_SS: vmcs_write16(GUEST_SS_SELECTOR, @@ -3351,9 +3314,9 @@ static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg) if (var.base != (var.selector << 4)) return false; - if (var.limit != 0xffff) + if (var.limit < 0xffff) return false; - if (ar != 0xf3) + if (((ar | (3 << AR_DPL_SHIFT)) & ~(AR_G_MASK | AR_DB_MASK)) != 0xf3) return false; return true; @@ -3605,7 +3568,7 @@ out: static void seg_setup(int seg) { - struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; + const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; unsigned int ar; vmcs_write16(sf->selector, 0); @@ -3770,8 +3733,7 @@ static void vmx_set_constant_host_state(void) native_store_idt(&dt); vmcs_writel(HOST_IDTR_BASE, dt.address); /* 22.2.4 */ - asm("mov $.Lkvm_vmx_return, %0" : "=r"(tmpl)); - vmcs_writel(HOST_RIP, tmpl); /* 22.2.5 */ + vmcs_writel(HOST_RIP, vmx_return); /* 22.2.5 */ rdmsr(MSR_IA32_SYSENTER_CS, low32, high32); vmcs_write32(HOST_IA32_SYSENTER_CS, low32); @@ -4005,8 +3967,6 @@ static int vmx_vcpu_reset(struct kvm_vcpu *vcpu) kvm_rip_write(vcpu, 0); kvm_register_write(vcpu, VCPU_REGS_RSP, 0); - vmcs_writel(GUEST_DR7, 0x400); - vmcs_writel(GUEST_GDTR_BASE, 0); vmcs_write32(GUEST_GDTR_LIMIT, 0xffff); @@ -4456,7 +4416,7 @@ vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall) hypercall[2] = 0xc1; } -/* called to set cr0 as approriate for a mov-to-cr0 exit. */ +/* called to set cr0 as appropriate for a mov-to-cr0 exit. */ static int handle_set_cr0(struct kvm_vcpu *vcpu, unsigned long val) { if (to_vmx(vcpu)->nested.vmxon && @@ -5701,7 +5661,7 @@ static int handle_vmptrst(struct kvm_vcpu *vcpu) * may resume. Otherwise they set the kvm_run parameter to indicate what needs * to be done to userspace and return 0. */ -static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = { +static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = { [EXIT_REASON_EXCEPTION_NMI] = handle_exception, [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt, [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault, @@ -6229,17 +6189,10 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx) msrs[i].host); } -#ifdef CONFIG_X86_64 -#define R "r" -#define Q "q" -#else -#define R "e" -#define Q "l" -#endif - static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); + unsigned long debugctlmsr; if (is_guest_mode(vcpu) && !vmx->nested.nested_run_pending) { struct vmcs12 *vmcs12 = get_vmcs12(vcpu); @@ -6279,34 +6232,35 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) vmx_set_interrupt_shadow(vcpu, 0); atomic_switch_perf_msrs(vmx); + debugctlmsr = get_debugctlmsr(); vmx->__launched = vmx->loaded_vmcs->launched; asm( /* Store host registers */ - "push %%"R"dx; push %%"R"bp;" - "push %%"R"cx \n\t" /* placeholder for guest rcx */ - "push %%"R"cx \n\t" - "cmp %%"R"sp, %c[host_rsp](%0) \n\t" + "push %%" _ASM_DX "; push %%" _ASM_BP ";" + "push %%" _ASM_CX " \n\t" /* placeholder for guest rcx */ + "push %%" _ASM_CX " \n\t" + "cmp %%" _ASM_SP ", %c[host_rsp](%0) \n\t" "je 1f \n\t" - "mov %%"R"sp, %c[host_rsp](%0) \n\t" + "mov %%" _ASM_SP ", %c[host_rsp](%0) \n\t" __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t" "1: \n\t" /* Reload cr2 if changed */ - "mov %c[cr2](%0), %%"R"ax \n\t" - "mov %%cr2, %%"R"dx \n\t" - "cmp %%"R"ax, %%"R"dx \n\t" + "mov %c[cr2](%0), %%" _ASM_AX " \n\t" + "mov %%cr2, %%" _ASM_DX " \n\t" + "cmp %%" _ASM_AX ", %%" _ASM_DX " \n\t" "je 2f \n\t" - "mov %%"R"ax, %%cr2 \n\t" + "mov %%" _ASM_AX", %%cr2 \n\t" "2: \n\t" /* Check if vmlaunch of vmresume is needed */ "cmpl $0, %c[launched](%0) \n\t" /* Load guest registers. Don't clobber flags. */ - "mov %c[rax](%0), %%"R"ax \n\t" - "mov %c[rbx](%0), %%"R"bx \n\t" - "mov %c[rdx](%0), %%"R"dx \n\t" - "mov %c[rsi](%0), %%"R"si \n\t" - "mov %c[rdi](%0), %%"R"di \n\t" - "mov %c[rbp](%0), %%"R"bp \n\t" + "mov %c[rax](%0), %%" _ASM_AX " \n\t" + "mov %c[rbx](%0), %%" _ASM_BX " \n\t" + "mov %c[rdx](%0), %%" _ASM_DX " \n\t" + "mov %c[rsi](%0), %%" _ASM_SI " \n\t" + "mov %c[rdi](%0), %%" _ASM_DI " \n\t" + "mov %c[rbp](%0), %%" _ASM_BP " \n\t" #ifdef CONFIG_X86_64 "mov %c[r8](%0), %%r8 \n\t" "mov %c[r9](%0), %%r9 \n\t" @@ -6317,24 +6271,24 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) "mov %c[r14](%0), %%r14 \n\t" "mov %c[r15](%0), %%r15 \n\t" #endif - "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */ + "mov %c[rcx](%0), %%" _ASM_CX " \n\t" /* kills %0 (ecx) */ /* Enter guest mode */ - "jne .Llaunched \n\t" + "jne 1f \n\t" __ex(ASM_VMX_VMLAUNCH) "\n\t" - "jmp .Lkvm_vmx_return \n\t" - ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t" - ".Lkvm_vmx_return: " + "jmp 2f \n\t" + "1: " __ex(ASM_VMX_VMRESUME) "\n\t" + "2: " /* Save guest registers, load host registers, keep flags */ - "mov %0, %c[wordsize](%%"R"sp) \n\t" + "mov %0, %c[wordsize](%%" _ASM_SP ") \n\t" "pop %0 \n\t" - "mov %%"R"ax, %c[rax](%0) \n\t" - "mov %%"R"bx, %c[rbx](%0) \n\t" - "pop"Q" %c[rcx](%0) \n\t" - "mov %%"R"dx, %c[rdx](%0) \n\t" - "mov %%"R"si, %c[rsi](%0) \n\t" - "mov %%"R"di, %c[rdi](%0) \n\t" - "mov %%"R"bp, %c[rbp](%0) \n\t" + "mov %%" _ASM_AX ", %c[rax](%0) \n\t" + "mov %%" _ASM_BX ", %c[rbx](%0) \n\t" + __ASM_SIZE(pop) " %c[rcx](%0) \n\t" + "mov %%" _ASM_DX ", %c[rdx](%0) \n\t" + "mov %%" _ASM_SI ", %c[rsi](%0) \n\t" + "mov %%" _ASM_DI ", %c[rdi](%0) \n\t" + "mov %%" _ASM_BP ", %c[rbp](%0) \n\t" #ifdef CONFIG_X86_64 "mov %%r8, %c[r8](%0) \n\t" "mov %%r9, %c[r9](%0) \n\t" @@ -6345,11 +6299,15 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) "mov %%r14, %c[r14](%0) \n\t" "mov %%r15, %c[r15](%0) \n\t" #endif - "mov %%cr2, %%"R"ax \n\t" - "mov %%"R"ax, %c[cr2](%0) \n\t" + "mov %%cr2, %%" _ASM_AX " \n\t" + "mov %%" _ASM_AX ", %c[cr2](%0) \n\t" - "pop %%"R"bp; pop %%"R"dx \n\t" + "pop %%" _ASM_BP "; pop %%" _ASM_DX " \n\t" "setbe %c[fail](%0) \n\t" + ".pushsection .rodata \n\t" + ".global vmx_return \n\t" + "vmx_return: " _ASM_PTR " 2b \n\t" + ".popsection" : : "c"(vmx), "d"((unsigned long)HOST_RSP), [launched]"i"(offsetof(struct vcpu_vmx, __launched)), [fail]"i"(offsetof(struct vcpu_vmx, fail)), @@ -6374,12 +6332,18 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)), [wordsize]"i"(sizeof(ulong)) : "cc", "memory" - , R"ax", R"bx", R"di", R"si" #ifdef CONFIG_X86_64 + , "rax", "rbx", "rdi", "rsi" , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15" +#else + , "eax", "ebx", "edi", "esi" #endif ); + /* MSR_IA32_DEBUGCTLMSR is zeroed on vmexit. Restore it if needed */ + if (debugctlmsr) + update_debugctlmsr(debugctlmsr); + #ifndef CONFIG_X86_64 /* * The sysexit path does not restore ds/es, so we must set them to @@ -6424,9 +6388,6 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) vmx_complete_interrupts(vmx); } -#undef R -#undef Q - static void vmx_free_vcpu(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); @@ -7281,7 +7242,7 @@ static struct kvm_x86_ops vmx_x86_ops = { .vcpu_load = vmx_vcpu_load, .vcpu_put = vmx_vcpu_put, - .set_guest_debug = set_guest_debug, + .update_db_bp_intercept = update_exception_bitmap, .get_msr = vmx_get_msr, .set_msr = vmx_set_msr, .get_segment_base = vmx_get_segment_base, diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 1f09552572fa..1eefebe5d727 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -246,20 +246,14 @@ static void drop_user_return_notifiers(void *ignore) u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) { - if (irqchip_in_kernel(vcpu->kvm)) - return vcpu->arch.apic_base; - else - return vcpu->arch.apic_base; + return vcpu->arch.apic_base; } EXPORT_SYMBOL_GPL(kvm_get_apic_base); void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data) { /* TODO: reserve bits check */ - if (irqchip_in_kernel(vcpu->kvm)) - kvm_lapic_set_base(vcpu, data); - else - vcpu->arch.apic_base = data; + kvm_lapic_set_base(vcpu, data); } EXPORT_SYMBOL_GPL(kvm_set_apic_base); @@ -698,6 +692,18 @@ unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(kvm_get_cr8); +static void kvm_update_dr7(struct kvm_vcpu *vcpu) +{ + unsigned long dr7; + + if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) + dr7 = vcpu->arch.guest_debug_dr7; + else + dr7 = vcpu->arch.dr7; + kvm_x86_ops->set_dr7(vcpu, dr7); + vcpu->arch.switch_db_regs = (dr7 & DR7_BP_EN_MASK); +} + static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) { switch (dr) { @@ -723,10 +729,7 @@ static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) if (val & 0xffffffff00000000ULL) return -1; /* #GP */ vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; - if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { - kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7); - vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK); - } + kvm_update_dr7(vcpu); break; } @@ -823,7 +826,7 @@ static u32 msrs_to_save[] = { static unsigned num_msrs_to_save; -static u32 emulated_msrs[] = { +static const u32 emulated_msrs[] = { MSR_IA32_TSCDEADLINE, MSR_IA32_MISC_ENABLE, MSR_IA32_MCG_STATUS, @@ -1097,7 +1100,7 @@ void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data) * For each generation, we track the original measured * nanosecond time, offset, and write, so if TSCs are in * sync, we can match exact offset, and if not, we can match - * exact software computaion in compute_guest_tsc() + * exact software computation in compute_guest_tsc() * * These values are tracked in kvm->arch.cur_xxx variables. */ @@ -1140,6 +1143,7 @@ static int kvm_guest_time_update(struct kvm_vcpu *v) unsigned long this_tsc_khz; s64 kernel_ns, max_kernel_ns; u64 tsc_timestamp; + u8 pvclock_flags; /* Keep irq disabled to prevent changes to the clock */ local_irq_save(flags); @@ -1221,7 +1225,14 @@ static int kvm_guest_time_update(struct kvm_vcpu *v) vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; vcpu->last_kernel_ns = kernel_ns; vcpu->last_guest_tsc = tsc_timestamp; - vcpu->hv_clock.flags = 0; + + pvclock_flags = 0; + if (vcpu->pvclock_set_guest_stopped_request) { + pvclock_flags |= PVCLOCK_GUEST_STOPPED; + vcpu->pvclock_set_guest_stopped_request = false; + } + + vcpu->hv_clock.flags = pvclock_flags; /* * The interface expects us to write an even number signaling that the @@ -1504,7 +1515,7 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) { gpa_t gpa = data & ~0x3f; - /* Bits 2:5 are resrved, Should be zero */ + /* Bits 2:5 are reserved, Should be zero */ if (data & 0x3c) return 1; @@ -1639,10 +1650,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) vcpu->arch.time_page = gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT); - if (is_error_page(vcpu->arch.time_page)) { - kvm_release_page_clean(vcpu->arch.time_page); + if (is_error_page(vcpu->arch.time_page)) vcpu->arch.time_page = NULL; - } + break; } case MSR_KVM_ASYNC_PF_EN: @@ -1727,7 +1737,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) * Ignore all writes to this no longer documented MSR. * Writes are only relevant for old K7 processors, * all pre-dating SVM, but a recommended workaround from - * AMD for these chips. It is possible to speicify the + * AMD for these chips. It is possible to specify the * affected processor models on the command line, hence * the need to ignore the workaround. */ @@ -2177,6 +2187,8 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_GET_TSC_KHZ: case KVM_CAP_PCI_2_3: case KVM_CAP_KVMCLOCK_CTRL: + case KVM_CAP_READONLY_MEM: + case KVM_CAP_IRQFD_RESAMPLE: r = 1; break; case KVM_CAP_COALESCED_MMIO: @@ -2358,8 +2370,7 @@ static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s) { - memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s); - kvm_apic_post_state_restore(vcpu); + kvm_apic_post_state_restore(vcpu, s); update_cr8_intercept(vcpu); return 0; @@ -2368,7 +2379,7 @@ static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) { - if (irq->irq < 0 || irq->irq >= 256) + if (irq->irq < 0 || irq->irq >= KVM_NR_INTERRUPTS) return -EINVAL; if (irqchip_in_kernel(vcpu->kvm)) return -ENXIO; @@ -2635,11 +2646,9 @@ static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu, */ static int kvm_set_guest_paused(struct kvm_vcpu *vcpu) { - struct pvclock_vcpu_time_info *src = &vcpu->arch.hv_clock; if (!vcpu->arch.time_page) return -EINVAL; - src->flags |= PVCLOCK_GUEST_STOPPED; - mark_page_dirty(vcpu->kvm, vcpu->arch.time >> PAGE_SHIFT); + vcpu->arch.pvclock_set_guest_stopped_request = true; kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); return 0; } @@ -3090,7 +3099,7 @@ static int kvm_vm_ioctl_reinject(struct kvm *kvm, if (!kvm->arch.vpit) return -ENXIO; mutex_lock(&kvm->arch.vpit->pit_state.lock); - kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject; + kvm->arch.vpit->pit_state.reinject = control->pit_reinject; mutex_unlock(&kvm->arch.vpit->pit_state.lock); return 0; } @@ -3173,6 +3182,16 @@ out: return r; } +int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event) +{ + if (!irqchip_in_kernel(kvm)) + return -ENXIO; + + irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, + irq_event->irq, irq_event->level); + return 0; +} + long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -3279,29 +3298,6 @@ long kvm_arch_vm_ioctl(struct file *filp, create_pit_unlock: mutex_unlock(&kvm->slots_lock); break; - case KVM_IRQ_LINE_STATUS: - case KVM_IRQ_LINE: { - struct kvm_irq_level irq_event; - - r = -EFAULT; - if (copy_from_user(&irq_event, argp, sizeof irq_event)) - goto out; - r = -ENXIO; - if (irqchip_in_kernel(kvm)) { - __s32 status; - status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, - irq_event.irq, irq_event.level); - if (ioctl == KVM_IRQ_LINE_STATUS) { - r = -EFAULT; - irq_event.status = status; - if (copy_to_user(argp, &irq_event, - sizeof irq_event)) - goto out; - } - r = 0; - } - break; - } case KVM_GET_IRQCHIP: { /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ struct kvm_irqchip *chip; @@ -3689,20 +3685,17 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, gpa_t *gpa, struct x86_exception *exception, bool write) { - u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; + u32 access = ((kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0) + | (write ? PFERR_WRITE_MASK : 0); - if (vcpu_match_mmio_gva(vcpu, gva) && - check_write_user_access(vcpu, write, access, - vcpu->arch.access)) { + if (vcpu_match_mmio_gva(vcpu, gva) + && !permission_fault(vcpu->arch.walk_mmu, vcpu->arch.access, access)) { *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT | (gva & (PAGE_SIZE - 1)); trace_vcpu_match_mmio(gva, *gpa, write, false); return 1; } - if (write) - access |= PFERR_WRITE_MASK; - *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); if (*gpa == UNMAPPED_GVA) @@ -3790,14 +3783,14 @@ static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, return X86EMUL_CONTINUE; } -static struct read_write_emulator_ops read_emultor = { +static const struct read_write_emulator_ops read_emultor = { .read_write_prepare = read_prepare, .read_write_emulate = read_emulate, .read_write_mmio = vcpu_mmio_read, .read_write_exit_mmio = read_exit_mmio, }; -static struct read_write_emulator_ops write_emultor = { +static const struct read_write_emulator_ops write_emultor = { .read_write_emulate = write_emulate, .read_write_mmio = write_mmio, .read_write_exit_mmio = write_exit_mmio, @@ -3808,7 +3801,7 @@ static int emulator_read_write_onepage(unsigned long addr, void *val, unsigned int bytes, struct x86_exception *exception, struct kvm_vcpu *vcpu, - struct read_write_emulator_ops *ops) + const struct read_write_emulator_ops *ops) { gpa_t gpa; int handled, ret; @@ -3857,7 +3850,7 @@ mmio: int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr, void *val, unsigned int bytes, struct x86_exception *exception, - struct read_write_emulator_ops *ops) + const struct read_write_emulator_ops *ops) { struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); gpa_t gpa; @@ -3962,10 +3955,8 @@ static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt, goto emul_write; page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT); - if (is_error_page(page)) { - kvm_release_page_clean(page); + if (is_error_page(page)) goto emul_write; - } kaddr = kmap_atomic(page); kaddr += offset_in_page(gpa); @@ -4332,7 +4323,19 @@ static void emulator_get_cpuid(struct x86_emulate_ctxt *ctxt, kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx); } -static struct x86_emulate_ops emulate_ops = { +static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg) +{ + return kvm_register_read(emul_to_vcpu(ctxt), reg); +} + +static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val) +{ + kvm_register_write(emul_to_vcpu(ctxt), reg, val); +} + +static const struct x86_emulate_ops emulate_ops = { + .read_gpr = emulator_read_gpr, + .write_gpr = emulator_write_gpr, .read_std = kvm_read_guest_virt_system, .write_std = kvm_write_guest_virt_system, .fetch = kvm_fetch_guest_virt, @@ -4367,14 +4370,6 @@ static struct x86_emulate_ops emulate_ops = { .get_cpuid = emulator_get_cpuid, }; -static void cache_all_regs(struct kvm_vcpu *vcpu) -{ - kvm_register_read(vcpu, VCPU_REGS_RAX); - kvm_register_read(vcpu, VCPU_REGS_RSP); - kvm_register_read(vcpu, VCPU_REGS_RIP); - vcpu->arch.regs_dirty = ~0; -} - static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask) { u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask); @@ -4401,12 +4396,10 @@ static void inject_emulated_exception(struct kvm_vcpu *vcpu) kvm_queue_exception(vcpu, ctxt->exception.vector); } -static void init_decode_cache(struct x86_emulate_ctxt *ctxt, - const unsigned long *regs) +static void init_decode_cache(struct x86_emulate_ctxt *ctxt) { memset(&ctxt->twobyte, 0, - (void *)&ctxt->regs - (void *)&ctxt->twobyte); - memcpy(ctxt->regs, regs, sizeof(ctxt->regs)); + (void *)&ctxt->_regs - (void *)&ctxt->twobyte); ctxt->fetch.start = 0; ctxt->fetch.end = 0; @@ -4421,14 +4414,6 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu) struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; int cs_db, cs_l; - /* - * TODO: fix emulate.c to use guest_read/write_register - * instead of direct ->regs accesses, can save hundred cycles - * on Intel for instructions that don't read/change RSP, for - * for example. - */ - cache_all_regs(vcpu); - kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); ctxt->eflags = kvm_get_rflags(vcpu); @@ -4440,7 +4425,7 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu) X86EMUL_MODE_PROT16; ctxt->guest_mode = is_guest_mode(vcpu); - init_decode_cache(ctxt, vcpu->arch.regs); + init_decode_cache(ctxt); vcpu->arch.emulate_regs_need_sync_from_vcpu = false; } @@ -4460,7 +4445,6 @@ int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip) return EMULATE_FAIL; ctxt->eip = ctxt->_eip; - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); kvm_rip_write(vcpu, ctxt->eip); kvm_set_rflags(vcpu, ctxt->eflags); @@ -4493,13 +4477,14 @@ static int handle_emulation_failure(struct kvm_vcpu *vcpu) static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva) { gpa_t gpa; + pfn_t pfn; if (tdp_enabled) return false; /* * if emulation was due to access to shadowed page table - * and it failed try to unshadow page and re-entetr the + * and it failed try to unshadow page and re-enter the * guest to let CPU execute the instruction. */ if (kvm_mmu_unprotect_page_virt(vcpu, gva)) @@ -4510,8 +4495,17 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva) if (gpa == UNMAPPED_GVA) return true; /* let cpu generate fault */ - if (!kvm_is_error_hva(gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT))) + /* + * Do not retry the unhandleable instruction if it faults on the + * readonly host memory, otherwise it will goto a infinite loop: + * retry instruction -> write #PF -> emulation fail -> retry + * instruction -> ... + */ + pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa)); + if (!is_error_pfn(pfn)) { + kvm_release_pfn_clean(pfn); return true; + } return false; } @@ -4560,6 +4554,9 @@ static bool retry_instruction(struct x86_emulate_ctxt *ctxt, return true; } +static int complete_emulated_mmio(struct kvm_vcpu *vcpu); +static int complete_emulated_pio(struct kvm_vcpu *vcpu); + int x86_emulate_instruction(struct kvm_vcpu *vcpu, unsigned long cr2, int emulation_type, @@ -4608,7 +4605,7 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, changes registers values during IO operation */ if (vcpu->arch.emulate_regs_need_sync_from_vcpu) { vcpu->arch.emulate_regs_need_sync_from_vcpu = false; - memcpy(ctxt->regs, vcpu->arch.regs, sizeof ctxt->regs); + emulator_invalidate_register_cache(ctxt); } restart: @@ -4630,13 +4627,16 @@ restart: } else if (vcpu->arch.pio.count) { if (!vcpu->arch.pio.in) vcpu->arch.pio.count = 0; - else + else { writeback = false; + vcpu->arch.complete_userspace_io = complete_emulated_pio; + } r = EMULATE_DO_MMIO; } else if (vcpu->mmio_needed) { if (!vcpu->mmio_is_write) writeback = false; r = EMULATE_DO_MMIO; + vcpu->arch.complete_userspace_io = complete_emulated_mmio; } else if (r == EMULATION_RESTART) goto restart; else @@ -4646,7 +4646,6 @@ restart: toggle_interruptibility(vcpu, ctxt->interruptibility); kvm_set_rflags(vcpu, ctxt->eflags); kvm_make_request(KVM_REQ_EVENT, vcpu); - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); vcpu->arch.emulate_regs_need_sync_to_vcpu = false; kvm_rip_write(vcpu, ctxt->eip); } else @@ -4929,6 +4928,7 @@ int kvm_arch_init(void *opaque) if (cpu_has_xsave) host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); + kvm_lapic_init(); return 0; out: @@ -5499,6 +5499,24 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) return r; } +static inline int complete_emulated_io(struct kvm_vcpu *vcpu) +{ + int r; + vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE); + srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); + if (r != EMULATE_DONE) + return 0; + return 1; +} + +static int complete_emulated_pio(struct kvm_vcpu *vcpu) +{ + BUG_ON(!vcpu->arch.pio.count); + + return complete_emulated_io(vcpu); +} + /* * Implements the following, as a state machine: * @@ -5515,47 +5533,37 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) * copy data * exit */ -static int complete_mmio(struct kvm_vcpu *vcpu) +static int complete_emulated_mmio(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; struct kvm_mmio_fragment *frag; - int r; - if (!(vcpu->arch.pio.count || vcpu->mmio_needed)) - return 1; + BUG_ON(!vcpu->mmio_needed); - if (vcpu->mmio_needed) { - /* Complete previous fragment */ - frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment++]; - if (!vcpu->mmio_is_write) - memcpy(frag->data, run->mmio.data, frag->len); - if (vcpu->mmio_cur_fragment == vcpu->mmio_nr_fragments) { - vcpu->mmio_needed = 0; - if (vcpu->mmio_is_write) - return 1; - vcpu->mmio_read_completed = 1; - goto done; - } - /* Initiate next fragment */ - ++frag; - run->exit_reason = KVM_EXIT_MMIO; - run->mmio.phys_addr = frag->gpa; + /* Complete previous fragment */ + frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment++]; + if (!vcpu->mmio_is_write) + memcpy(frag->data, run->mmio.data, frag->len); + if (vcpu->mmio_cur_fragment == vcpu->mmio_nr_fragments) { + vcpu->mmio_needed = 0; if (vcpu->mmio_is_write) - memcpy(run->mmio.data, frag->data, frag->len); - run->mmio.len = frag->len; - run->mmio.is_write = vcpu->mmio_is_write; - return 0; - - } -done: - vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); - r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE); - srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); - if (r != EMULATE_DONE) - return 0; - return 1; + return 1; + vcpu->mmio_read_completed = 1; + return complete_emulated_io(vcpu); + } + /* Initiate next fragment */ + ++frag; + run->exit_reason = KVM_EXIT_MMIO; + run->mmio.phys_addr = frag->gpa; + if (vcpu->mmio_is_write) + memcpy(run->mmio.data, frag->data, frag->len); + run->mmio.len = frag->len; + run->mmio.is_write = vcpu->mmio_is_write; + vcpu->arch.complete_userspace_io = complete_emulated_mmio; + return 0; } + int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { int r; @@ -5582,9 +5590,14 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) } } - r = complete_mmio(vcpu); - if (r <= 0) - goto out; + if (unlikely(vcpu->arch.complete_userspace_io)) { + int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io; + vcpu->arch.complete_userspace_io = NULL; + r = cui(vcpu); + if (r <= 0) + goto out; + } else + WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed); r = __vcpu_run(vcpu); @@ -5602,12 +5615,11 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) /* * We are here if userspace calls get_regs() in the middle of * instruction emulation. Registers state needs to be copied - * back from emulation context to vcpu. Usrapace shouldn't do + * back from emulation context to vcpu. Userspace shouldn't do * that usually, but some bad designed PV devices (vmware * backdoor interface) need this to work */ - struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); + emulator_writeback_register_cache(&vcpu->arch.emulate_ctxt); vcpu->arch.emulate_regs_need_sync_to_vcpu = false; } regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX); @@ -5747,7 +5759,6 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index, if (ret) return EMULATE_FAIL; - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); kvm_rip_write(vcpu, ctxt->eip); kvm_set_rflags(vcpu, ctxt->eflags); kvm_make_request(KVM_REQ_EVENT, vcpu); @@ -5799,7 +5810,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, if (mmu_reset_needed) kvm_mmu_reset_context(vcpu); - max_bits = (sizeof sregs->interrupt_bitmap) << 3; + max_bits = KVM_NR_INTERRUPTS; pending_vec = find_first_bit( (const unsigned long *)sregs->interrupt_bitmap, max_bits); if (pending_vec < max_bits) { @@ -5859,13 +5870,12 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { for (i = 0; i < KVM_NR_DB_REGS; ++i) vcpu->arch.eff_db[i] = dbg->arch.debugreg[i]; - vcpu->arch.switch_db_regs = - (dbg->arch.debugreg[7] & DR7_BP_EN_MASK); + vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7]; } else { for (i = 0; i < KVM_NR_DB_REGS; i++) vcpu->arch.eff_db[i] = vcpu->arch.db[i]; - vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK); } + kvm_update_dr7(vcpu); if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) + @@ -5877,7 +5887,7 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, */ kvm_set_rflags(vcpu, rflags); - kvm_x86_ops->set_guest_debug(vcpu, dbg); + kvm_x86_ops->update_db_bp_intercept(vcpu); r = 0; @@ -6023,7 +6033,9 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) int r; vcpu->arch.mtrr_state.have_fixed = 1; - vcpu_load(vcpu); + r = vcpu_load(vcpu); + if (r) + return r; r = kvm_arch_vcpu_reset(vcpu); if (r == 0) r = kvm_mmu_setup(vcpu); @@ -6034,9 +6046,11 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) { + int r; vcpu->arch.apf.msr_val = 0; - vcpu_load(vcpu); + r = vcpu_load(vcpu); + BUG_ON(r); kvm_mmu_unload(vcpu); vcpu_put(vcpu); @@ -6050,10 +6064,10 @@ int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu) vcpu->arch.nmi_pending = 0; vcpu->arch.nmi_injected = false; - vcpu->arch.switch_db_regs = 0; memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db)); vcpu->arch.dr6 = DR6_FIXED_1; vcpu->arch.dr7 = DR7_FIXED_1; + kvm_update_dr7(vcpu); kvm_make_request(KVM_REQ_EVENT, vcpu); vcpu->arch.apf.msr_val = 0; @@ -6132,7 +6146,7 @@ int kvm_arch_hardware_enable(void *garbage) * as we reset last_host_tsc on all VCPUs to stop this from being * called multiple times (one for each physical CPU bringup). * - * Platforms with unnreliable TSCs don't have to deal with this, they + * Platforms with unreliable TSCs don't have to deal with this, they * will be compensated by the logic in vcpu_load, which sets the TSC to * catchup mode. This will catchup all VCPUs to real time, but cannot * guarantee that they stay in perfect synchronization. @@ -6185,6 +6199,8 @@ bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL); } +struct static_key kvm_no_apic_vcpu __read_mostly; + int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) { struct page *page; @@ -6217,7 +6233,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) r = kvm_create_lapic(vcpu); if (r < 0) goto fail_mmu_destroy; - } + } else + static_key_slow_inc(&kvm_no_apic_vcpu); vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4, GFP_KERNEL); @@ -6257,6 +6274,8 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) kvm_mmu_destroy(vcpu); srcu_read_unlock(&vcpu->kvm->srcu, idx); free_page((unsigned long)vcpu->arch.pio_data); + if (!irqchip_in_kernel(vcpu->kvm)) + static_key_slow_dec(&kvm_no_apic_vcpu); } int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) @@ -6269,15 +6288,21 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); + /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */ + set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, + &kvm->arch.irq_sources_bitmap); raw_spin_lock_init(&kvm->arch.tsc_write_lock); + mutex_init(&kvm->arch.apic_map_lock); return 0; } static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) { - vcpu_load(vcpu); + int r; + r = vcpu_load(vcpu); + BUG_ON(r); kvm_mmu_unload(vcpu); vcpu_put(vcpu); } @@ -6321,6 +6346,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm) put_page(kvm->arch.apic_access_page); if (kvm->arch.ept_identity_pagetable) put_page(kvm->arch.ept_identity_pagetable); + kfree(rcu_dereference_check(kvm->arch.apic_map, 1)); } void kvm_arch_free_memslot(struct kvm_memory_slot *free, @@ -6328,10 +6354,18 @@ void kvm_arch_free_memslot(struct kvm_memory_slot *free, { int i; - for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { - if (!dont || free->arch.lpage_info[i] != dont->arch.lpage_info[i]) { - kvm_kvfree(free->arch.lpage_info[i]); - free->arch.lpage_info[i] = NULL; + for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { + if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) { + kvm_kvfree(free->arch.rmap[i]); + free->arch.rmap[i] = NULL; + } + if (i == 0) + continue; + + if (!dont || free->arch.lpage_info[i - 1] != + dont->arch.lpage_info[i - 1]) { + kvm_kvfree(free->arch.lpage_info[i - 1]); + free->arch.lpage_info[i - 1] = NULL; } } } @@ -6340,23 +6374,30 @@ int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) { int i; - for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { + for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { unsigned long ugfn; int lpages; - int level = i + 2; + int level = i + 1; lpages = gfn_to_index(slot->base_gfn + npages - 1, slot->base_gfn, level) + 1; - slot->arch.lpage_info[i] = - kvm_kvzalloc(lpages * sizeof(*slot->arch.lpage_info[i])); - if (!slot->arch.lpage_info[i]) + slot->arch.rmap[i] = + kvm_kvzalloc(lpages * sizeof(*slot->arch.rmap[i])); + if (!slot->arch.rmap[i]) + goto out_free; + if (i == 0) + continue; + + slot->arch.lpage_info[i - 1] = kvm_kvzalloc(lpages * + sizeof(*slot->arch.lpage_info[i - 1])); + if (!slot->arch.lpage_info[i - 1]) goto out_free; if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) - slot->arch.lpage_info[i][0].write_count = 1; + slot->arch.lpage_info[i - 1][0].write_count = 1; if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) - slot->arch.lpage_info[i][lpages - 1].write_count = 1; + slot->arch.lpage_info[i - 1][lpages - 1].write_count = 1; ugfn = slot->userspace_addr >> PAGE_SHIFT; /* * If the gfn and userspace address are not aligned wrt each @@ -6368,16 +6409,21 @@ int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) unsigned long j; for (j = 0; j < lpages; ++j) - slot->arch.lpage_info[i][j].write_count = 1; + slot->arch.lpage_info[i - 1][j].write_count = 1; } } return 0; out_free: - for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { - kvm_kvfree(slot->arch.lpage_info[i]); - slot->arch.lpage_info[i] = NULL; + for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { + kvm_kvfree(slot->arch.rmap[i]); + slot->arch.rmap[i] = NULL; + if (i == 0) + continue; + + kvm_kvfree(slot->arch.lpage_info[i - 1]); + slot->arch.lpage_info[i - 1] = NULL; } return -ENOMEM; } @@ -6396,10 +6442,10 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, map_flags = MAP_SHARED | MAP_ANONYMOUS; /*To keep backward compatibility with older userspace, - *x86 needs to hanlde !user_alloc case. + *x86 needs to handle !user_alloc case. */ if (!user_alloc) { - if (npages && !old.rmap) { + if (npages && !old.npages) { unsigned long userspace_addr; userspace_addr = vm_mmap(NULL, 0, @@ -6427,7 +6473,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, int nr_mmu_pages = 0, npages = mem->memory_size >> PAGE_SHIFT; - if (!user_alloc && !old.user_alloc && old.rmap && !npages) { + if (!user_alloc && !old.user_alloc && old.npages && !npages) { int ret; ret = vm_munmap(old.userspace_addr, @@ -6446,14 +6492,28 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages); kvm_mmu_slot_remove_write_access(kvm, mem->slot); spin_unlock(&kvm->mmu_lock); + /* + * If memory slot is created, or moved, we need to clear all + * mmio sptes. + */ + if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT) { + kvm_mmu_zap_all(kvm); + kvm_reload_remote_mmus(kvm); + } } -void kvm_arch_flush_shadow(struct kvm *kvm) +void kvm_arch_flush_shadow_all(struct kvm *kvm) { kvm_mmu_zap_all(kvm); kvm_reload_remote_mmus(kvm); } +void kvm_arch_flush_shadow_memslot(struct kvm *kvm, + struct kvm_memory_slot *slot) +{ + kvm_arch_flush_shadow_all(kvm); +} + int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) { return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index 3d1134ddb885..2b5219c12ac8 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -124,4 +124,5 @@ int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt, extern u64 host_xcr0; +extern struct static_key kvm_no_apic_vcpu; #endif diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 2ce09aa7d3b3..0a6d6ba44c85 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -101,9 +101,13 @@ struct kvm_userspace_memory_region { __u64 userspace_addr; /* start of the userspace allocated memory */ }; -/* for kvm_memory_region::flags */ -#define KVM_MEM_LOG_DIRTY_PAGES 1UL -#define KVM_MEMSLOT_INVALID (1UL << 1) +/* + * The bit 0 ~ bit 15 of kvm_memory_region::flags are visible for userspace, + * other bits are reserved for kvm internal use which are defined in + * include/linux/kvm_host.h. + */ +#define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) +#define KVM_MEM_READONLY (1UL << 1) /* for KVM_IRQ_LINE */ struct kvm_irq_level { @@ -618,6 +622,10 @@ struct kvm_ppc_smmu_info { #define KVM_CAP_PPC_GET_SMMU_INFO 78 #define KVM_CAP_S390_COW 79 #define KVM_CAP_PPC_ALLOC_HTAB 80 +#ifdef __KVM_HAVE_READONLY_MEM +#define KVM_CAP_READONLY_MEM 81 +#endif +#define KVM_CAP_IRQFD_RESAMPLE 82 #ifdef KVM_CAP_IRQ_ROUTING @@ -683,12 +691,21 @@ struct kvm_xen_hvm_config { #endif #define KVM_IRQFD_FLAG_DEASSIGN (1 << 0) +/* + * Available with KVM_CAP_IRQFD_RESAMPLE + * + * KVM_IRQFD_FLAG_RESAMPLE indicates resamplefd is valid and specifies + * the irqfd to operate in resampling mode for level triggered interrupt + * emlation. See Documentation/virtual/kvm/api.txt. + */ +#define KVM_IRQFD_FLAG_RESAMPLE (1 << 1) struct kvm_irqfd { __u32 fd; __u32 gsi; __u32 flags; - __u8 pad[20]; + __u32 resamplefd; + __u8 pad[16]; }; struct kvm_clock_data { diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 8a59e0abe5fa..93bfc9f9815c 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -21,6 +21,7 @@ #include <linux/slab.h> #include <linux/rcupdate.h> #include <linux/ratelimit.h> +#include <linux/err.h> #include <asm/signal.h> #include <linux/kvm.h> @@ -35,6 +36,13 @@ #endif /* + * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used + * in kvm, other bits are visible for userspace which are defined in + * include/linux/kvm_h. + */ +#define KVM_MEMSLOT_INVALID (1UL << 16) + +/* * If we support unaligned MMIO, at most one fragment will be split into two: */ #ifdef KVM_UNALIGNED_MMIO @@ -49,6 +57,47 @@ (KVM_MMIO_SIZE / KVM_USER_MMIO_SIZE + KVM_EXTRA_MMIO_FRAGMENTS) /* + * For the normal pfn, the highest 12 bits should be zero, + * so we can mask these bits to indicate the error. + */ +#define KVM_PFN_ERR_MASK (0xfffULL << 52) + +#define KVM_PFN_ERR_FAULT (KVM_PFN_ERR_MASK) +#define KVM_PFN_ERR_HWPOISON (KVM_PFN_ERR_MASK + 1) +#define KVM_PFN_ERR_BAD (KVM_PFN_ERR_MASK + 2) +#define KVM_PFN_ERR_RO_FAULT (KVM_PFN_ERR_MASK + 3) + +static inline bool is_error_pfn(pfn_t pfn) +{ + return !!(pfn & KVM_PFN_ERR_MASK); +} + +static inline bool is_noslot_pfn(pfn_t pfn) +{ + return pfn == KVM_PFN_ERR_BAD; +} + +static inline bool is_invalid_pfn(pfn_t pfn) +{ + return !is_noslot_pfn(pfn) && is_error_pfn(pfn); +} + +#define KVM_HVA_ERR_BAD (PAGE_OFFSET) +#define KVM_HVA_ERR_RO_BAD (PAGE_OFFSET + PAGE_SIZE) + +static inline bool kvm_is_error_hva(unsigned long addr) +{ + return addr >= PAGE_OFFSET; +} + +#define KVM_ERR_PTR_BAD_PAGE (ERR_PTR(-ENOENT)) + +static inline bool is_error_page(struct page *page) +{ + return IS_ERR(page); +} + +/* * vcpu->requests bit members */ #define KVM_REQ_TLB_FLUSH 0 @@ -70,7 +119,8 @@ #define KVM_REQ_PMU 16 #define KVM_REQ_PMI 17 -#define KVM_USERSPACE_IRQ_SOURCE_ID 0 +#define KVM_USERSPACE_IRQ_SOURCE_ID 0 +#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1 struct kvm; struct kvm_vcpu; @@ -183,6 +233,18 @@ struct kvm_vcpu { } async_pf; #endif +#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT + /* + * Cpu relax intercept or pause loop exit optimization + * in_spin_loop: set when a vcpu does a pause loop exit + * or cpu relax intercepted. + * dy_eligible: indicates whether vcpu is eligible for directed yield. + */ + struct { + bool in_spin_loop; + bool dy_eligible; + } spin_loop; +#endif struct kvm_vcpu_arch arch; }; @@ -201,7 +263,6 @@ struct kvm_memory_slot { gfn_t base_gfn; unsigned long npages; unsigned long flags; - unsigned long *rmap; unsigned long *dirty_bitmap; struct kvm_arch_memory_slot arch; unsigned long userspace_addr; @@ -283,6 +344,8 @@ struct kvm { struct { spinlock_t lock; struct list_head items; + struct list_head resampler_list; + struct mutex resampler_lock; } irqfds; struct list_head ioeventfds; #endif @@ -348,7 +411,7 @@ static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i) int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id); void kvm_vcpu_uninit(struct kvm_vcpu *vcpu); -void vcpu_load(struct kvm_vcpu *vcpu); +int __must_check vcpu_load(struct kvm_vcpu *vcpu); void vcpu_put(struct kvm_vcpu *vcpu); int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, @@ -378,23 +441,6 @@ id_to_memslot(struct kvm_memslots *slots, int id) return slot; } -#define HPA_MSB ((sizeof(hpa_t) * 8) - 1) -#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB) -static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; } - -extern struct page *bad_page; -extern struct page *fault_page; - -extern pfn_t bad_pfn; -extern pfn_t fault_pfn; - -int is_error_page(struct page *page); -int is_error_pfn(pfn_t pfn); -int is_hwpoison_pfn(pfn_t pfn); -int is_fault_pfn(pfn_t pfn); -int is_noslot_pfn(pfn_t pfn); -int is_invalid_pfn(pfn_t pfn); -int kvm_is_error_hva(unsigned long addr); int kvm_set_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem, int user_alloc); @@ -415,28 +461,33 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, int user_alloc); bool kvm_largepages_enabled(void); void kvm_disable_largepages(void); -void kvm_arch_flush_shadow(struct kvm *kvm); +/* flush all memory translations */ +void kvm_arch_flush_shadow_all(struct kvm *kvm); +/* flush memory translations pointing to 'slot' */ +void kvm_arch_flush_shadow_memslot(struct kvm *kvm, + struct kvm_memory_slot *slot); int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, int nr_pages); struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn); unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn); +unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn); void kvm_release_page_clean(struct page *page); void kvm_release_page_dirty(struct page *page); void kvm_set_page_dirty(struct page *page); void kvm_set_page_accessed(struct page *page); -pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr); pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn); pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, bool write_fault, bool *writable); pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn); pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, bool *writable); -pfn_t gfn_to_pfn_memslot(struct kvm *kvm, - struct kvm_memory_slot *slot, gfn_t gfn); -void kvm_release_pfn_dirty(pfn_t); +pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn); +pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn); + +void kvm_release_pfn_dirty(pfn_t pfn); void kvm_release_pfn_clean(pfn_t pfn); void kvm_set_pfn_dirty(pfn_t pfn); void kvm_set_pfn_accessed(pfn_t pfn); @@ -494,6 +545,7 @@ int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem, int user_alloc); +int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level); long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg); @@ -573,7 +625,7 @@ void kvm_arch_sync_events(struct kvm *kvm); int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu); void kvm_vcpu_kick(struct kvm_vcpu *vcpu); -int kvm_is_mmio_pfn(pfn_t pfn); +bool kvm_is_mmio_pfn(pfn_t pfn); struct kvm_irq_ack_notifier { struct hlist_node link; @@ -728,6 +780,12 @@ __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn) return search_memslots(slots, gfn); } +static inline unsigned long +__gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn) +{ + return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE; +} + static inline int memslot_id(struct kvm *kvm, gfn_t gfn) { return gfn_to_memslot(kvm, gfn)->id; @@ -740,10 +798,12 @@ static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level) (base_gfn >> KVM_HPAGE_GFN_SHIFT(level)); } -static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, - gfn_t gfn) +static inline gfn_t +hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot) { - return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE; + gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT; + + return slot->base_gfn + gfn_offset; } static inline gpa_t gfn_to_gpa(gfn_t gfn) @@ -899,5 +959,32 @@ static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu) } } +#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT + +static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val) +{ + vcpu->spin_loop.in_spin_loop = val; +} +static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val) +{ + vcpu->spin_loop.dy_eligible = val; +} + +#else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */ + +static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val) +{ +} + +static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val) +{ +} + +static inline bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) +{ + return true; +} + +#endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */ #endif diff --git a/kernel/jump_label.c b/kernel/jump_label.c index 43049192b5ec..60f48fa0fd0d 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -118,6 +118,7 @@ void jump_label_rate_limit(struct static_key_deferred *key, key->timeout = rl; INIT_DELAYED_WORK(&key->work, jump_label_update_timeout); } +EXPORT_SYMBOL_GPL(jump_label_rate_limit); static int addr_conflict(struct jump_entry *entry, void *start, void *end) { diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig index 28694f4a9139..d01b24b72c61 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig @@ -21,3 +21,6 @@ config KVM_ASYNC_PF config HAVE_KVM_MSI bool + +config HAVE_KVM_CPU_RELAX_INTERCEPT + bool diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c index 74268b4c2ee1..ea475cd03511 100644 --- a/virt/kvm/async_pf.c +++ b/virt/kvm/async_pf.c @@ -111,8 +111,8 @@ void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu) list_entry(vcpu->async_pf.done.next, typeof(*work), link); list_del(&work->link); - if (work->page) - put_page(work->page); + if (!is_error_page(work->page)) + kvm_release_page_clean(work->page); kmem_cache_free(async_pf_cache, work); } spin_unlock(&vcpu->async_pf.lock); @@ -138,8 +138,8 @@ void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu) list_del(&work->queue); vcpu->async_pf.queued--; - if (work->page) - put_page(work->page); + if (!is_error_page(work->page)) + kvm_release_page_clean(work->page); kmem_cache_free(async_pf_cache, work); } } @@ -203,8 +203,7 @@ int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu) if (!work) return -ENOMEM; - work->page = bad_page; - get_page(bad_page); + work->page = KVM_ERR_PTR_BAD_PAGE; INIT_LIST_HEAD(&work->queue); /* for list_del to work */ spin_lock(&vcpu->async_pf.lock); diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 67a35e90384c..9718e98d6d2a 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -43,6 +43,31 @@ * -------------------------------------------------------------------- */ +/* + * Resampling irqfds are a special variety of irqfds used to emulate + * level triggered interrupts. The interrupt is asserted on eventfd + * trigger. On acknowledgement through the irq ack notifier, the + * interrupt is de-asserted and userspace is notified through the + * resamplefd. All resamplers on the same gsi are de-asserted + * together, so we don't need to track the state of each individual + * user. We can also therefore share the same irq source ID. + */ +struct _irqfd_resampler { + struct kvm *kvm; + /* + * List of resampling struct _irqfd objects sharing this gsi. + * RCU list modified under kvm->irqfds.resampler_lock + */ + struct list_head list; + struct kvm_irq_ack_notifier notifier; + /* + * Entry in list of kvm->irqfd.resampler_list. Use for sharing + * resamplers among irqfds on the same gsi. + * Accessed and modified under kvm->irqfds.resampler_lock + */ + struct list_head link; +}; + struct _irqfd { /* Used for MSI fast-path */ struct kvm *kvm; @@ -52,6 +77,12 @@ struct _irqfd { /* Used for level IRQ fast-path */ int gsi; struct work_struct inject; + /* The resampler used by this irqfd (resampler-only) */ + struct _irqfd_resampler *resampler; + /* Eventfd notified on resample (resampler-only) */ + struct eventfd_ctx *resamplefd; + /* Entry in list of irqfds for a resampler (resampler-only) */ + struct list_head resampler_link; /* Used for setup/shutdown */ struct eventfd_ctx *eventfd; struct list_head list; @@ -67,8 +98,58 @@ irqfd_inject(struct work_struct *work) struct _irqfd *irqfd = container_of(work, struct _irqfd, inject); struct kvm *kvm = irqfd->kvm; - kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 1); - kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 0); + if (!irqfd->resampler) { + kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 1); + kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 0); + } else + kvm_set_irq(kvm, KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, + irqfd->gsi, 1); +} + +/* + * Since resampler irqfds share an IRQ source ID, we de-assert once + * then notify all of the resampler irqfds using this GSI. We can't + * do multiple de-asserts or we risk racing with incoming re-asserts. + */ +static void +irqfd_resampler_ack(struct kvm_irq_ack_notifier *kian) +{ + struct _irqfd_resampler *resampler; + struct _irqfd *irqfd; + + resampler = container_of(kian, struct _irqfd_resampler, notifier); + + kvm_set_irq(resampler->kvm, KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, + resampler->notifier.gsi, 0); + + rcu_read_lock(); + + list_for_each_entry_rcu(irqfd, &resampler->list, resampler_link) + eventfd_signal(irqfd->resamplefd, 1); + + rcu_read_unlock(); +} + +static void +irqfd_resampler_shutdown(struct _irqfd *irqfd) +{ + struct _irqfd_resampler *resampler = irqfd->resampler; + struct kvm *kvm = resampler->kvm; + + mutex_lock(&kvm->irqfds.resampler_lock); + + list_del_rcu(&irqfd->resampler_link); + synchronize_rcu(); + + if (list_empty(&resampler->list)) { + list_del(&resampler->link); + kvm_unregister_irq_ack_notifier(kvm, &resampler->notifier); + kvm_set_irq(kvm, KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, + resampler->notifier.gsi, 0); + kfree(resampler); + } + + mutex_unlock(&kvm->irqfds.resampler_lock); } /* @@ -92,6 +173,11 @@ irqfd_shutdown(struct work_struct *work) */ flush_work(&irqfd->inject); + if (irqfd->resampler) { + irqfd_resampler_shutdown(irqfd); + eventfd_ctx_put(irqfd->resamplefd); + } + /* * It is now safe to release the object's resources */ @@ -203,7 +289,7 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) struct kvm_irq_routing_table *irq_rt; struct _irqfd *irqfd, *tmp; struct file *file = NULL; - struct eventfd_ctx *eventfd = NULL; + struct eventfd_ctx *eventfd = NULL, *resamplefd = NULL; int ret; unsigned int events; @@ -231,6 +317,54 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) irqfd->eventfd = eventfd; + if (args->flags & KVM_IRQFD_FLAG_RESAMPLE) { + struct _irqfd_resampler *resampler; + + resamplefd = eventfd_ctx_fdget(args->resamplefd); + if (IS_ERR(resamplefd)) { + ret = PTR_ERR(resamplefd); + goto fail; + } + + irqfd->resamplefd = resamplefd; + INIT_LIST_HEAD(&irqfd->resampler_link); + + mutex_lock(&kvm->irqfds.resampler_lock); + + list_for_each_entry(resampler, + &kvm->irqfds.resampler_list, list) { + if (resampler->notifier.gsi == irqfd->gsi) { + irqfd->resampler = resampler; + break; + } + } + + if (!irqfd->resampler) { + resampler = kzalloc(sizeof(*resampler), GFP_KERNEL); + if (!resampler) { + ret = -ENOMEM; + mutex_unlock(&kvm->irqfds.resampler_lock); + goto fail; + } + + resampler->kvm = kvm; + INIT_LIST_HEAD(&resampler->list); + resampler->notifier.gsi = irqfd->gsi; + resampler->notifier.irq_acked = irqfd_resampler_ack; + INIT_LIST_HEAD(&resampler->link); + + list_add(&resampler->link, &kvm->irqfds.resampler_list); + kvm_register_irq_ack_notifier(kvm, + &resampler->notifier); + irqfd->resampler = resampler; + } + + list_add_rcu(&irqfd->resampler_link, &irqfd->resampler->list); + synchronize_rcu(); + + mutex_unlock(&kvm->irqfds.resampler_lock); + } + /* * Install our own custom wake-up handling so we are notified via * a callback whenever someone signals the underlying eventfd @@ -276,6 +410,12 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args) return 0; fail: + if (irqfd->resampler) + irqfd_resampler_shutdown(irqfd); + + if (resamplefd && !IS_ERR(resamplefd)) + eventfd_ctx_put(resamplefd); + if (eventfd && !IS_ERR(eventfd)) eventfd_ctx_put(eventfd); @@ -291,6 +431,8 @@ kvm_eventfd_init(struct kvm *kvm) { spin_lock_init(&kvm->irqfds.lock); INIT_LIST_HEAD(&kvm->irqfds.items); + INIT_LIST_HEAD(&kvm->irqfds.resampler_list); + mutex_init(&kvm->irqfds.resampler_lock); INIT_LIST_HEAD(&kvm->ioeventfds); } @@ -340,7 +482,7 @@ kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args) int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args) { - if (args->flags & ~KVM_IRQFD_FLAG_DEASSIGN) + if (args->flags & ~(KVM_IRQFD_FLAG_DEASSIGN | KVM_IRQFD_FLAG_RESAMPLE)) return -EINVAL; if (args->flags & KVM_IRQFD_FLAG_DEASSIGN) diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index ef61d529a6c4..cfb7e4d52dc2 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -197,28 +197,29 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, u32 old_irr; u32 mask = 1 << irq; union kvm_ioapic_redirect_entry entry; - int ret = 1; + int ret, irq_level; + + BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS); spin_lock(&ioapic->lock); old_irr = ioapic->irr; - if (irq >= 0 && irq < IOAPIC_NUM_PINS) { - int irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq], - irq_source_id, level); - entry = ioapic->redirtbl[irq]; - irq_level ^= entry.fields.polarity; - if (!irq_level) - ioapic->irr &= ~mask; - else { - int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG); - ioapic->irr |= mask; - if ((edge && old_irr != ioapic->irr) || - (!edge && !entry.fields.remote_irr)) - ret = ioapic_service(ioapic, irq); - else - ret = 0; /* report coalesced interrupt */ - } - trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0); + irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq], + irq_source_id, level); + entry = ioapic->redirtbl[irq]; + irq_level ^= entry.fields.polarity; + if (!irq_level) { + ioapic->irr &= ~mask; + ret = 1; + } else { + int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG); + ioapic->irr |= mask; + if ((edge && old_irr != ioapic->irr) || + (!edge && !entry.fields.remote_irr)) + ret = ioapic_service(ioapic, irq); + else + ret = 0; /* report coalesced interrupt */ } + trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0); spin_unlock(&ioapic->lock); return ret; diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c index e9fff9830bf0..037cb6730e68 100644 --- a/virt/kvm/iommu.c +++ b/virt/kvm/iommu.c @@ -42,13 +42,13 @@ static int kvm_iommu_unmap_memslots(struct kvm *kvm); static void kvm_iommu_put_pages(struct kvm *kvm, gfn_t base_gfn, unsigned long npages); -static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot, - gfn_t gfn, unsigned long size) +static pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn, + unsigned long size) { gfn_t end_gfn; pfn_t pfn; - pfn = gfn_to_pfn_memslot(kvm, slot, gfn); + pfn = gfn_to_pfn_memslot(slot, gfn); end_gfn = gfn + (size >> PAGE_SHIFT); gfn += 1; @@ -56,7 +56,7 @@ static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot, return pfn; while (gfn < end_gfn) - gfn_to_pfn_memslot(kvm, slot, gfn++); + gfn_to_pfn_memslot(slot, gfn++); return pfn; } @@ -105,7 +105,7 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot) * Pin all pages we are about to map in memory. This is * important because we unmap and unpin in 4kb steps later. */ - pfn = kvm_pin_pages(kvm, slot, gfn, page_size); + pfn = kvm_pin_pages(slot, gfn, page_size); if (is_error_pfn(pfn)) { gfn += 1; continue; @@ -300,6 +300,12 @@ static void kvm_iommu_put_pages(struct kvm *kvm, /* Get physical address */ phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn)); + + if (!phys) { + gfn++; + continue; + } + pfn = phys >> PAGE_SHIFT; /* Unmap address from IO address space */ diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index 83402d74a767..2eb58af7ee99 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -68,8 +68,13 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, struct kvm_vcpu *vcpu, *lowest = NULL; if (irq->dest_mode == 0 && irq->dest_id == 0xff && - kvm_is_dm_lowest_prio(irq)) + kvm_is_dm_lowest_prio(irq)) { printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); + irq->delivery_mode = APIC_DM_FIXED; + } + + if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r)) + return r; kvm_for_each_vcpu(i, vcpu, kvm) { if (!kvm_apic_present(vcpu)) @@ -223,6 +228,9 @@ int kvm_request_irq_source_id(struct kvm *kvm) } ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); +#ifdef CONFIG_X86 + ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); +#endif set_bit(irq_source_id, bitmap); unlock: mutex_unlock(&kvm->irq_lock); @@ -233,6 +241,9 @@ unlock: void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) { ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); +#ifdef CONFIG_X86 + ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); +#endif mutex_lock(&kvm->irq_lock); if (irq_source_id < 0 || @@ -321,11 +332,11 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt, switch (ue->u.irqchip.irqchip) { case KVM_IRQCHIP_PIC_MASTER: e->set = kvm_set_pic_irq; - max_pin = 16; + max_pin = PIC_NUM_PINS; break; case KVM_IRQCHIP_PIC_SLAVE: e->set = kvm_set_pic_irq; - max_pin = 16; + max_pin = PIC_NUM_PINS; delta = 8; break; case KVM_IRQCHIP_IOAPIC: diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d617f69131d7..c353b4599cec 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -100,13 +100,7 @@ EXPORT_SYMBOL_GPL(kvm_rebooting); static bool largepages_enabled = true; -static struct page *hwpoison_page; -static pfn_t hwpoison_pfn; - -struct page *fault_page; -pfn_t fault_pfn; - -inline int kvm_is_mmio_pfn(pfn_t pfn) +bool kvm_is_mmio_pfn(pfn_t pfn) { if (pfn_valid(pfn)) { int reserved; @@ -137,11 +131,12 @@ inline int kvm_is_mmio_pfn(pfn_t pfn) /* * Switches to specified vcpu, until a matching vcpu_put() */ -void vcpu_load(struct kvm_vcpu *vcpu) +int vcpu_load(struct kvm_vcpu *vcpu) { int cpu; - mutex_lock(&vcpu->mutex); + if (mutex_lock_killable(&vcpu->mutex)) + return -EINTR; if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { /* The thread running this VCPU changed. */ struct pid *oldpid = vcpu->pid; @@ -154,6 +149,7 @@ void vcpu_load(struct kvm_vcpu *vcpu) preempt_notifier_register(&vcpu->preempt_notifier); kvm_arch_vcpu_load(vcpu, cpu); put_cpu(); + return 0; } void vcpu_put(struct kvm_vcpu *vcpu) @@ -236,6 +232,9 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) } vcpu->run = page_address(page); + kvm_vcpu_set_in_spin_loop(vcpu, false); + kvm_vcpu_set_dy_eligible(vcpu, false); + r = kvm_arch_vcpu_init(vcpu); if (r < 0) goto fail_free_run; @@ -332,8 +331,7 @@ static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, * count is also read inside the mmu_lock critical section. */ kvm->mmu_notifier_count++; - for (; start < end; start += PAGE_SIZE) - need_tlb_flush |= kvm_unmap_hva(kvm, start); + need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); need_tlb_flush |= kvm->tlbs_dirty; /* we've to flush the tlb before the pages can be freed */ if (need_tlb_flush) @@ -412,7 +410,7 @@ static void kvm_mmu_notifier_release(struct mmu_notifier *mn, int idx; idx = srcu_read_lock(&kvm->srcu); - kvm_arch_flush_shadow(kvm); + kvm_arch_flush_shadow_all(kvm); srcu_read_unlock(&kvm->srcu, idx); } @@ -551,16 +549,12 @@ static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) static void kvm_free_physmem_slot(struct kvm_memory_slot *free, struct kvm_memory_slot *dont) { - if (!dont || free->rmap != dont->rmap) - vfree(free->rmap); - if (!dont || free->dirty_bitmap != dont->dirty_bitmap) kvm_destroy_dirty_bitmap(free); kvm_arch_free_memslot(free, dont); free->npages = 0; - free->rmap = NULL; } void kvm_free_physmem(struct kvm *kvm) @@ -590,7 +584,7 @@ static void kvm_destroy_vm(struct kvm *kvm) #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); #else - kvm_arch_flush_shadow(kvm); + kvm_arch_flush_shadow_all(kvm); #endif kvm_arch_destroy_vm(kvm); kvm_free_physmem(kvm); @@ -686,6 +680,20 @@ void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new) slots->generation++; } +static int check_memory_region_flags(struct kvm_userspace_memory_region *mem) +{ + u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; + +#ifdef KVM_CAP_READONLY_MEM + valid_flags |= KVM_MEM_READONLY; +#endif + + if (mem->flags & ~valid_flags) + return -EINVAL; + + return 0; +} + /* * Allocate some memory and give it an address in the guest physical address * space. @@ -706,6 +714,10 @@ int __kvm_set_memory_region(struct kvm *kvm, struct kvm_memory_slot old, new; struct kvm_memslots *slots, *old_memslots; + r = check_memory_region_flags(mem); + if (r) + goto out; + r = -EINVAL; /* General sanity checks */ if (mem->memory_size & (PAGE_SIZE - 1)) @@ -769,11 +781,7 @@ int __kvm_set_memory_region(struct kvm *kvm, if (npages && !old.npages) { new.user_alloc = user_alloc; new.userspace_addr = mem->userspace_addr; -#ifndef CONFIG_S390 - new.rmap = vzalloc(npages * sizeof(*new.rmap)); - if (!new.rmap) - goto out_free; -#endif /* not defined CONFIG_S390 */ + if (kvm_arch_create_memslot(&new, npages)) goto out_free; } @@ -785,7 +793,7 @@ int __kvm_set_memory_region(struct kvm *kvm, /* destroy any largepage mappings for dirty tracking */ } - if (!npages) { + if (!npages || base_gfn != old.base_gfn) { struct kvm_memory_slot *slot; r = -ENOMEM; @@ -801,14 +809,14 @@ int __kvm_set_memory_region(struct kvm *kvm, old_memslots = kvm->memslots; rcu_assign_pointer(kvm->memslots, slots); synchronize_srcu_expedited(&kvm->srcu); - /* From this point no new shadow pages pointing to a deleted - * memslot will be created. + /* From this point no new shadow pages pointing to a deleted, + * or moved, memslot will be created. * * validation of sp->gfn happens in: * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) * - kvm_is_visible_gfn (mmu_check_roots) */ - kvm_arch_flush_shadow(kvm); + kvm_arch_flush_shadow_memslot(kvm, slot); kfree(old_memslots); } @@ -832,7 +840,6 @@ int __kvm_set_memory_region(struct kvm *kvm, /* actual memory is freed via old in kvm_free_physmem_slot below */ if (!npages) { - new.rmap = NULL; new.dirty_bitmap = NULL; memset(&new.arch, 0, sizeof(new.arch)); } @@ -844,13 +851,6 @@ int __kvm_set_memory_region(struct kvm *kvm, kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); - /* - * If the new memory slot is created, we need to clear all - * mmio sptes. - */ - if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT) - kvm_arch_flush_shadow(kvm); - kvm_free_physmem_slot(&old, &new); kfree(old_memslots); @@ -932,53 +932,6 @@ void kvm_disable_largepages(void) } EXPORT_SYMBOL_GPL(kvm_disable_largepages); -int is_error_page(struct page *page) -{ - return page == bad_page || page == hwpoison_page || page == fault_page; -} -EXPORT_SYMBOL_GPL(is_error_page); - -int is_error_pfn(pfn_t pfn) -{ - return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; -} -EXPORT_SYMBOL_GPL(is_error_pfn); - -int is_hwpoison_pfn(pfn_t pfn) -{ - return pfn == hwpoison_pfn; -} -EXPORT_SYMBOL_GPL(is_hwpoison_pfn); - -int is_fault_pfn(pfn_t pfn) -{ - return pfn == fault_pfn; -} -EXPORT_SYMBOL_GPL(is_fault_pfn); - -int is_noslot_pfn(pfn_t pfn) -{ - return pfn == bad_pfn; -} -EXPORT_SYMBOL_GPL(is_noslot_pfn); - -int is_invalid_pfn(pfn_t pfn) -{ - return pfn == hwpoison_pfn || pfn == fault_pfn; -} -EXPORT_SYMBOL_GPL(is_invalid_pfn); - -static inline unsigned long bad_hva(void) -{ - return PAGE_OFFSET; -} - -int kvm_is_error_hva(unsigned long addr) -{ - return addr == bad_hva(); -} -EXPORT_SYMBOL_GPL(kvm_is_error_hva); - struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) { return __gfn_to_memslot(kvm_memslots(kvm), gfn); @@ -1021,28 +974,62 @@ out: return size; } -static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, - gfn_t *nr_pages) +static bool memslot_is_readonly(struct kvm_memory_slot *slot) +{ + return slot->flags & KVM_MEM_READONLY; +} + +static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, + gfn_t *nr_pages, bool write) { if (!slot || slot->flags & KVM_MEMSLOT_INVALID) - return bad_hva(); + return KVM_HVA_ERR_BAD; + + if (memslot_is_readonly(slot) && write) + return KVM_HVA_ERR_RO_BAD; if (nr_pages) *nr_pages = slot->npages - (gfn - slot->base_gfn); - return gfn_to_hva_memslot(slot, gfn); + return __gfn_to_hva_memslot(slot, gfn); } +static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, + gfn_t *nr_pages) +{ + return __gfn_to_hva_many(slot, gfn, nr_pages, true); +} + +unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, + gfn_t gfn) +{ + return gfn_to_hva_many(slot, gfn, NULL); +} +EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); + unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) { return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); } EXPORT_SYMBOL_GPL(gfn_to_hva); -static pfn_t get_fault_pfn(void) +/* + * The hva returned by this function is only allowed to be read. + * It should pair with kvm_read_hva() or kvm_read_hva_atomic(). + */ +static unsigned long gfn_to_hva_read(struct kvm *kvm, gfn_t gfn) +{ + return __gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL, false); +} + +static int kvm_read_hva(void *data, void __user *hva, int len) { - get_page(fault_page); - return fault_pfn; + return __copy_from_user(data, hva, len); +} + +static int kvm_read_hva_atomic(void *data, void __user *hva, int len) +{ + return __copy_from_user_inatomic(data, hva, len); } int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, @@ -1065,108 +1052,186 @@ static inline int check_user_page_hwpoison(unsigned long addr) return rc == -EHWPOISON; } -static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, - bool *async, bool write_fault, bool *writable) +/* + * The atomic path to get the writable pfn which will be stored in @pfn, + * true indicates success, otherwise false is returned. + */ +static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async, + bool write_fault, bool *writable, pfn_t *pfn) { struct page *page[1]; - int npages = 0; - pfn_t pfn; + int npages; - /* we can do it either atomically or asynchronously, not both */ - BUG_ON(atomic && async); + if (!(async || atomic)) + return false; - BUG_ON(!write_fault && !writable); + /* + * Fast pin a writable pfn only if it is a write fault request + * or the caller allows to map a writable pfn for a read fault + * request. + */ + if (!(write_fault || writable)) + return false; - if (writable) - *writable = true; + npages = __get_user_pages_fast(addr, 1, 1, page); + if (npages == 1) { + *pfn = page_to_pfn(page[0]); - if (atomic || async) - npages = __get_user_pages_fast(addr, 1, 1, page); + if (writable) + *writable = true; + return true; + } - if (unlikely(npages != 1) && !atomic) { - might_sleep(); + return false; +} - if (writable) - *writable = write_fault; +/* + * The slow path to get the pfn of the specified host virtual address, + * 1 indicates success, -errno is returned if error is detected. + */ +static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, + bool *writable, pfn_t *pfn) +{ + struct page *page[1]; + int npages = 0; - if (async) { - down_read(¤t->mm->mmap_sem); - npages = get_user_page_nowait(current, current->mm, - addr, write_fault, page); - up_read(¤t->mm->mmap_sem); - } else - npages = get_user_pages_fast(addr, 1, write_fault, - page); - - /* map read fault as writable if possible */ - if (unlikely(!write_fault) && npages == 1) { - struct page *wpage[1]; - - npages = __get_user_pages_fast(addr, 1, 1, wpage); - if (npages == 1) { - *writable = true; - put_page(page[0]); - page[0] = wpage[0]; - } - npages = 1; + might_sleep(); + + if (writable) + *writable = write_fault; + + if (async) { + down_read(¤t->mm->mmap_sem); + npages = get_user_page_nowait(current, current->mm, + addr, write_fault, page); + up_read(¤t->mm->mmap_sem); + } else + npages = get_user_pages_fast(addr, 1, write_fault, + page); + if (npages != 1) + return npages; + + /* map read fault as writable if possible */ + if (unlikely(!write_fault) && writable) { + struct page *wpage[1]; + + npages = __get_user_pages_fast(addr, 1, 1, wpage); + if (npages == 1) { + *writable = true; + put_page(page[0]); + page[0] = wpage[0]; } + + npages = 1; } + *pfn = page_to_pfn(page[0]); + return npages; +} - if (unlikely(npages != 1)) { - struct vm_area_struct *vma; +static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) +{ + if (unlikely(!(vma->vm_flags & VM_READ))) + return false; - if (atomic) - return get_fault_pfn(); + if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) + return false; - down_read(¤t->mm->mmap_sem); - if (npages == -EHWPOISON || - (!async && check_user_page_hwpoison(addr))) { - up_read(¤t->mm->mmap_sem); - get_page(hwpoison_page); - return page_to_pfn(hwpoison_page); - } + return true; +} - vma = find_vma_intersection(current->mm, addr, addr+1); - - if (vma == NULL) - pfn = get_fault_pfn(); - else if ((vma->vm_flags & VM_PFNMAP)) { - pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + - vma->vm_pgoff; - BUG_ON(!kvm_is_mmio_pfn(pfn)); - } else { - if (async && (vma->vm_flags & VM_WRITE)) - *async = true; - pfn = get_fault_pfn(); - } - up_read(¤t->mm->mmap_sem); - } else - pfn = page_to_pfn(page[0]); +/* + * Pin guest page in memory and return its pfn. + * @addr: host virtual address which maps memory to the guest + * @atomic: whether this function can sleep + * @async: whether this function need to wait IO complete if the + * host page is not in the memory + * @write_fault: whether we should get a writable host page + * @writable: whether it allows to map a writable host page for !@write_fault + * + * The function will map a writable host page for these two cases: + * 1): @write_fault = true + * 2): @write_fault = false && @writable, @writable will tell the caller + * whether the mapping is writable. + */ +static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, + bool write_fault, bool *writable) +{ + struct vm_area_struct *vma; + pfn_t pfn = 0; + int npages; + + /* we can do it either atomically or asynchronously, not both */ + BUG_ON(atomic && async); + if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) + return pfn; + + if (atomic) + return KVM_PFN_ERR_FAULT; + + npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); + if (npages == 1) + return pfn; + + down_read(¤t->mm->mmap_sem); + if (npages == -EHWPOISON || + (!async && check_user_page_hwpoison(addr))) { + pfn = KVM_PFN_ERR_HWPOISON; + goto exit; + } + + vma = find_vma_intersection(current->mm, addr, addr + 1); + + if (vma == NULL) + pfn = KVM_PFN_ERR_FAULT; + else if ((vma->vm_flags & VM_PFNMAP)) { + pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + + vma->vm_pgoff; + BUG_ON(!kvm_is_mmio_pfn(pfn)); + } else { + if (async && vma_is_valid(vma, write_fault)) + *async = true; + pfn = KVM_PFN_ERR_FAULT; + } +exit: + up_read(¤t->mm->mmap_sem); return pfn; } -pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr) +static pfn_t +__gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic, + bool *async, bool write_fault, bool *writable) { - return hva_to_pfn(kvm, addr, true, NULL, true, NULL); + unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); + + if (addr == KVM_HVA_ERR_RO_BAD) + return KVM_PFN_ERR_RO_FAULT; + + if (kvm_is_error_hva(addr)) + return KVM_PFN_ERR_BAD; + + /* Do not map writable pfn in the readonly memslot. */ + if (writable && memslot_is_readonly(slot)) { + *writable = false; + writable = NULL; + } + + return hva_to_pfn(addr, atomic, async, write_fault, + writable); } -EXPORT_SYMBOL_GPL(hva_to_pfn_atomic); static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, bool write_fault, bool *writable) { - unsigned long addr; + struct kvm_memory_slot *slot; if (async) *async = false; - addr = gfn_to_hva(kvm, gfn); - if (kvm_is_error_hva(addr)) { - get_page(bad_page); - return page_to_pfn(bad_page); - } + slot = gfn_to_memslot(kvm, gfn); - return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable); + return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault, + writable); } pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) @@ -1195,12 +1260,16 @@ pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, } EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); -pfn_t gfn_to_pfn_memslot(struct kvm *kvm, - struct kvm_memory_slot *slot, gfn_t gfn) +pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) +{ + return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); +} + +pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) { - unsigned long addr = gfn_to_hva_memslot(slot, gfn); - return hva_to_pfn(kvm, addr, false, NULL, true, NULL); + return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); } +EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, int nr_pages) @@ -1219,30 +1288,42 @@ int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, } EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); +static struct page *kvm_pfn_to_page(pfn_t pfn) +{ + if (is_error_pfn(pfn)) + return KVM_ERR_PTR_BAD_PAGE; + + if (kvm_is_mmio_pfn(pfn)) { + WARN_ON(1); + return KVM_ERR_PTR_BAD_PAGE; + } + + return pfn_to_page(pfn); +} + struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) { pfn_t pfn; pfn = gfn_to_pfn(kvm, gfn); - if (!kvm_is_mmio_pfn(pfn)) - return pfn_to_page(pfn); - - WARN_ON(kvm_is_mmio_pfn(pfn)); - get_page(bad_page); - return bad_page; + return kvm_pfn_to_page(pfn); } EXPORT_SYMBOL_GPL(gfn_to_page); void kvm_release_page_clean(struct page *page) { + WARN_ON(is_error_page(page)); + kvm_release_pfn_clean(page_to_pfn(page)); } EXPORT_SYMBOL_GPL(kvm_release_page_clean); void kvm_release_pfn_clean(pfn_t pfn) { + WARN_ON(is_error_pfn(pfn)); + if (!kvm_is_mmio_pfn(pfn)) put_page(pfn_to_page(pfn)); } @@ -1250,6 +1331,8 @@ EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); void kvm_release_page_dirty(struct page *page) { + WARN_ON(is_error_page(page)); + kvm_release_pfn_dirty(page_to_pfn(page)); } EXPORT_SYMBOL_GPL(kvm_release_page_dirty); @@ -1305,10 +1388,10 @@ int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, int r; unsigned long addr; - addr = gfn_to_hva(kvm, gfn); + addr = gfn_to_hva_read(kvm, gfn); if (kvm_is_error_hva(addr)) return -EFAULT; - r = __copy_from_user(data, (void __user *)addr + offset, len); + r = kvm_read_hva(data, (void __user *)addr + offset, len); if (r) return -EFAULT; return 0; @@ -1343,11 +1426,11 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, gfn_t gfn = gpa >> PAGE_SHIFT; int offset = offset_in_page(gpa); - addr = gfn_to_hva(kvm, gfn); + addr = gfn_to_hva_read(kvm, gfn); if (kvm_is_error_hva(addr)) return -EFAULT; pagefault_disable(); - r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); + r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len); pagefault_enable(); if (r) return -EFAULT; @@ -1580,6 +1663,43 @@ bool kvm_vcpu_yield_to(struct kvm_vcpu *target) } EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); +#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT +/* + * Helper that checks whether a VCPU is eligible for directed yield. + * Most eligible candidate to yield is decided by following heuristics: + * + * (a) VCPU which has not done pl-exit or cpu relax intercepted recently + * (preempted lock holder), indicated by @in_spin_loop. + * Set at the beiginning and cleared at the end of interception/PLE handler. + * + * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get + * chance last time (mostly it has become eligible now since we have probably + * yielded to lockholder in last iteration. This is done by toggling + * @dy_eligible each time a VCPU checked for eligibility.) + * + * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding + * to preempted lock-holder could result in wrong VCPU selection and CPU + * burning. Giving priority for a potential lock-holder increases lock + * progress. + * + * Since algorithm is based on heuristics, accessing another VCPU data without + * locking does not harm. It may result in trying to yield to same VCPU, fail + * and continue with next VCPU and so on. + */ +bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) +{ + bool eligible; + + eligible = !vcpu->spin_loop.in_spin_loop || + (vcpu->spin_loop.in_spin_loop && + vcpu->spin_loop.dy_eligible); + + if (vcpu->spin_loop.in_spin_loop) + kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); + + return eligible; +} +#endif void kvm_vcpu_on_spin(struct kvm_vcpu *me) { struct kvm *kvm = me->kvm; @@ -1589,6 +1709,7 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me) int pass; int i; + kvm_vcpu_set_in_spin_loop(me, true); /* * We boost the priority of a VCPU that is runnable but not * currently running, because it got preempted by something @@ -1607,6 +1728,8 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me) continue; if (waitqueue_active(&vcpu->wq)) continue; + if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) + continue; if (kvm_vcpu_yield_to(vcpu)) { kvm->last_boosted_vcpu = i; yielded = 1; @@ -1614,6 +1737,10 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me) } } } + kvm_vcpu_set_in_spin_loop(me, false); + + /* Ensure vcpu is not eligible during next spinloop */ + kvm_vcpu_set_dy_eligible(me, false); } EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); @@ -1766,7 +1893,9 @@ static long kvm_vcpu_ioctl(struct file *filp, #endif - vcpu_load(vcpu); + r = vcpu_load(vcpu); + if (r) + return r; switch (ioctl) { case KVM_RUN: r = -EINVAL; @@ -2094,6 +2223,29 @@ static long kvm_vm_ioctl(struct file *filp, break; } #endif +#ifdef __KVM_HAVE_IRQ_LINE + case KVM_IRQ_LINE_STATUS: + case KVM_IRQ_LINE: { + struct kvm_irq_level irq_event; + + r = -EFAULT; + if (copy_from_user(&irq_event, argp, sizeof irq_event)) + goto out; + + r = kvm_vm_ioctl_irq_line(kvm, &irq_event); + if (r) + goto out; + + r = -EFAULT; + if (ioctl == KVM_IRQ_LINE_STATUS) { + if (copy_to_user(argp, &irq_event, sizeof irq_event)) + goto out; + } + + r = 0; + break; + } +#endif default: r = kvm_arch_vm_ioctl(filp, ioctl, arg); if (r == -ENOTTY) @@ -2698,9 +2850,6 @@ static struct syscore_ops kvm_syscore_ops = { .resume = kvm_resume, }; -struct page *bad_page; -pfn_t bad_pfn; - static inline struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) { @@ -2732,33 +2881,6 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, if (r) goto out_fail; - bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); - - if (bad_page == NULL) { - r = -ENOMEM; - goto out; - } - - bad_pfn = page_to_pfn(bad_page); - - hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); - - if (hwpoison_page == NULL) { - r = -ENOMEM; - goto out_free_0; - } - - hwpoison_pfn = page_to_pfn(hwpoison_page); - - fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); - - if (fault_page == NULL) { - r = -ENOMEM; - goto out_free_0; - } - - fault_pfn = page_to_pfn(fault_page); - if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { r = -ENOMEM; goto out_free_0; @@ -2833,12 +2955,6 @@ out_free_1: out_free_0a: free_cpumask_var(cpus_hardware_enabled); out_free_0: - if (fault_page) - __free_page(fault_page); - if (hwpoison_page) - __free_page(hwpoison_page); - __free_page(bad_page); -out: kvm_arch_exit(); out_fail: return r; @@ -2858,8 +2974,5 @@ void kvm_exit(void) kvm_arch_hardware_unsetup(); kvm_arch_exit(); free_cpumask_var(cpus_hardware_enabled); - __free_page(fault_page); - __free_page(hwpoison_page); - __free_page(bad_page); } EXPORT_SYMBOL_GPL(kvm_exit); |