diff options
| -rw-r--r-- | arch/powerpc/include/asm/kvm_book3s_asm.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/kvm_host.h | 19 | ||||
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 335 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rmhandlers.S | 297 | ||||
| -rw-r--r-- | arch/powerpc/kvm/powerpc.c | 21 |
6 files changed, 483 insertions, 196 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s_asm.h b/arch/powerpc/include/asm/kvm_book3s_asm.h index af73469530e..1f2f5b6156b 100644 --- a/arch/powerpc/include/asm/kvm_book3s_asm.h +++ b/arch/powerpc/include/asm/kvm_book3s_asm.h @@ -76,6 +76,7 @@ struct kvmppc_host_state { ulong scratch1; u8 in_guest; u8 restore_hid5; + u8 napping; #ifdef CONFIG_KVM_BOOK3S_64_HV struct kvm_vcpu *kvm_vcpu; diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index dec3054f6ad..bf8af5d5d5d 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -198,21 +198,29 @@ struct kvm_arch { */ struct kvmppc_vcore { int n_runnable; - int n_blocked; + int n_busy; int num_threads; int entry_exit_count; int n_woken; int nap_count; + int napping_threads; u16 pcpu; - u8 vcore_running; + u8 vcore_state; u8 in_guest; struct list_head runnable_threads; spinlock_t lock; + wait_queue_head_t wq; }; #define VCORE_ENTRY_COUNT(vc) ((vc)->entry_exit_count & 0xff) #define VCORE_EXIT_COUNT(vc) ((vc)->entry_exit_count >> 8) +/* Values for vcore_state */ +#define VCORE_INACTIVE 0 +#define VCORE_RUNNING 1 +#define VCORE_EXITING 2 +#define VCORE_SLEEPING 3 + struct kvmppc_pte { ulong eaddr; u64 vpage; @@ -403,11 +411,13 @@ struct kvm_vcpu_arch { struct dtl *dtl; struct dtl *dtl_end; + wait_queue_head_t *wqp; struct kvmppc_vcore *vcore; int ret; int trap; int state; int ptid; + bool timer_running; wait_queue_head_t cpu_run; struct kvm_vcpu_arch_shared *shared; @@ -423,8 +433,9 @@ struct kvm_vcpu_arch { #endif }; -#define KVMPPC_VCPU_BUSY_IN_HOST 0 -#define KVMPPC_VCPU_BLOCKED 1 +/* Values for vcpu->arch.state */ +#define KVMPPC_VCPU_STOPPED 0 +#define KVMPPC_VCPU_BUSY_IN_HOST 1 #define KVMPPC_VCPU_RUNNABLE 2 #endif /* __POWERPC_KVM_HOST_H__ */ diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index e069c766695..69f7ffe7f67 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -44,6 +44,7 @@ #include <asm/compat.h> #include <asm/mmu.h> #include <asm/hvcall.h> +#include <asm/xics.h> #endif #ifdef CONFIG_PPC_ISERIES #include <asm/iseries/alpaca.h> @@ -460,6 +461,8 @@ int main(void) DEFINE(VCPU_DEC, offsetof(struct kvm_vcpu, arch.dec)); DEFINE(VCPU_DEC_EXPIRES, offsetof(struct kvm_vcpu, arch.dec_expires)); DEFINE(VCPU_PENDING_EXC, offsetof(struct kvm_vcpu, arch.pending_exceptions)); + DEFINE(VCPU_CEDED, offsetof(struct kvm_vcpu, arch.ceded)); + DEFINE(VCPU_PRODDED, offsetof(struct kvm_vcpu, arch.prodded)); DEFINE(VCPU_VPA, offsetof(struct kvm_vcpu, arch.vpa)); DEFINE(VCPU_MMCR, offsetof(struct kvm_vcpu, arch.mmcr)); DEFINE(VCPU_PMC, offsetof(struct kvm_vcpu, arch.pmc)); @@ -475,6 +478,7 @@ int main(void) DEFINE(VCORE_ENTRY_EXIT, offsetof(struct kvmppc_vcore, entry_exit_count)); DEFINE(VCORE_NAP_COUNT, offsetof(struct kvmppc_vcore, nap_count)); DEFINE(VCORE_IN_GUEST, offsetof(struct kvmppc_vcore, in_guest)); + DEFINE(VCORE_NAPPING_THREADS, offsetof(struct kvmppc_vcore, napping_threads)); DEFINE(VCPU_SVCPU, offsetof(struct kvmppc_vcpu_book3s, shadow_vcpu) - offsetof(struct kvmppc_vcpu_book3s, vcpu)); DEFINE(VCPU_SLB_E, offsetof(struct kvmppc_slb, orige)); @@ -532,6 +536,7 @@ int main(void) HSTATE_FIELD(HSTATE_SCRATCH1, scratch1); HSTATE_FIELD(HSTATE_IN_GUEST, in_guest); HSTATE_FIELD(HSTATE_RESTORE_HID5, restore_hid5); + HSTATE_FIELD(HSTATE_NAPPING, napping); #ifdef CONFIG_KVM_BOOK3S_64_HV HSTATE_FIELD(HSTATE_KVM_VCPU, kvm_vcpu); @@ -544,6 +549,7 @@ int main(void) HSTATE_FIELD(HSTATE_DSCR, host_dscr); HSTATE_FIELD(HSTATE_DABR, dabr); HSTATE_FIELD(HSTATE_DECEXP, dec_expires); + DEFINE(IPI_PRIORITY, IPI_PRIORITY); #endif /* CONFIG_KVM_BOOK3S_64_HV */ #else /* CONFIG_PPC_BOOK3S */ diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index bf66ec731e8..4644c7986d8 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -62,6 +62,8 @@ /* #define EXIT_DEBUG_SIMPLE */ /* #define EXIT_DEBUG_INT */ +static void kvmppc_end_cede(struct kvm_vcpu *vcpu); + void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { local_paca->kvm_hstate.kvm_vcpu = vcpu; @@ -72,40 +74,10 @@ void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu) { } -static void kvmppc_vcpu_blocked(struct kvm_vcpu *vcpu); -static void kvmppc_vcpu_unblocked(struct kvm_vcpu *vcpu); - -void kvmppc_vcpu_block(struct kvm_vcpu *vcpu) -{ - u64 now; - unsigned long dec_nsec; - - now = get_tb(); - if (now >= vcpu->arch.dec_expires && !kvmppc_core_pending_dec(vcpu)) - kvmppc_core_queue_dec(vcpu); - if (vcpu->arch.pending_exceptions) - return; - if (vcpu->arch.dec_expires != ~(u64)0) { - dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC / - tb_ticks_per_sec; - hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec), - HRTIMER_MODE_REL); - } - - kvmppc_vcpu_blocked(vcpu); - - kvm_vcpu_block(vcpu); - vcpu->stat.halt_wakeup++; - - if (vcpu->arch.dec_expires != ~(u64)0) - hrtimer_try_to_cancel(&vcpu->arch.dec_timer); - - kvmppc_vcpu_unblocked(vcpu); -} - void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr) { vcpu->arch.shregs.msr = msr; + kvmppc_end_cede(vcpu); } void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr) @@ -257,15 +229,6 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) switch (req) { case H_CEDE: - vcpu->arch.shregs.msr |= MSR_EE; - vcpu->arch.ceded = 1; - smp_mb(); - if (!vcpu->arch.prodded) - kvmppc_vcpu_block(vcpu); - else - vcpu->arch.prodded = 0; - smp_mb(); - vcpu->arch.ceded = 0; break; case H_PROD: target = kvmppc_get_gpr(vcpu, 4); @@ -388,20 +351,6 @@ static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, break; } - - if (!(r & RESUME_HOST)) { - /* To avoid clobbering exit_reason, only check for signals if - * we aren't already exiting to userspace for some other - * reason. */ - if (signal_pending(tsk)) { - vcpu->stat.signal_exits++; - run->exit_reason = KVM_EXIT_INTR; - r = -EINTR; - } else { - kvmppc_core_deliver_interrupts(vcpu); - } - } - return r; } @@ -479,13 +428,9 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) kvmppc_mmu_book3s_hv_init(vcpu); /* - * Some vcpus may start out in stopped state. If we initialize - * them to busy-in-host state they will stop other vcpus in the - * vcore from running. Instead we initialize them to blocked - * state, effectively considering them to be stopped until we - * see the first run ioctl for them. + * We consider the vcpu stopped until we see the first run ioctl for it. */ - vcpu->arch.state = KVMPPC_VCPU_BLOCKED; + vcpu->arch.state = KVMPPC_VCPU_STOPPED; init_waitqueue_head(&vcpu->arch.cpu_run); @@ -496,6 +441,7 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) if (vcore) { INIT_LIST_HEAD(&vcore->runnable_threads); spin_lock_init(&vcore->lock); + init_waitqueue_head(&vcore->wq); } kvm->arch.vcores[core] = vcore; } @@ -506,7 +452,6 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) spin_lock(&vcore->lock); ++vcore->num_threads; - ++vcore->n_blocked; spin_unlock(&vcore->lock); vcpu->arch.vcore = vcore; @@ -527,30 +472,31 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu) kfree(vcpu); } -static void kvmppc_vcpu_blocked(struct kvm_vcpu *vcpu) +static void kvmppc_set_timer(struct kvm_vcpu *vcpu) { - struct kvmppc_vcore *vc = vcpu->arch.vcore; + unsigned long dec_nsec, now; - spin_lock(&vc->lock); - vcpu->arch.state = KVMPPC_VCPU_BLOCKED; - ++vc->n_blocked; - if (vc->n_runnable > 0 && - vc->n_runnable + vc->n_blocked == vc->num_threads) { - vcpu = list_first_entry(&vc->runnable_threads, struct kvm_vcpu, - arch.run_list); - wake_up(&vcpu->arch.cpu_run); + now = get_tb(); + if (now > vcpu->arch.dec_expires) { + /* decrementer has already gone negative */ + kvmppc_core_queue_dec(vcpu); + kvmppc_core_deliver_interrupts(vcpu); + return; } - spin_unlock(&vc->lock); + dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC + / tb_ticks_per_sec; + hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec), + HRTIMER_MODE_REL); + vcpu->arch.timer_running = 1; } -static void kvmppc_vcpu_unblocked(struct kvm_vcpu *vcpu) +static void kvmppc_end_cede(struct kvm_vcpu *vcpu) { - struct kvmppc_vcore *vc = vcpu->arch.vcore; - - spin_lock(&vc->lock); - vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; - --vc->n_blocked; - spin_unlock(&vc->lock); + vcpu->arch.ceded = 0; + if (vcpu->arch.timer_running) { + hrtimer_try_to_cancel(&vcpu->arch.dec_timer); + vcpu->arch.timer_running = 0; + } } extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu); @@ -565,6 +511,7 @@ static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, return; vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; --vc->n_runnable; + ++vc->n_busy; /* decrement the physical thread id of each following vcpu */ v = vcpu; list_for_each_entry_continue(v, &vc->runnable_threads, arch.run_list) @@ -578,15 +525,20 @@ static void kvmppc_start_thread(struct kvm_vcpu *vcpu) struct paca_struct *tpaca; struct kvmppc_vcore *vc = vcpu->arch.vcore; + if (vcpu->arch.timer_running) { + hrtimer_try_to_cancel(&vcpu->arch.dec_timer); + vcpu->arch.timer_running = 0; + } cpu = vc->pcpu + vcpu->arch.ptid; tpaca = &paca[cpu]; tpaca->kvm_hstate.kvm_vcpu = vcpu; tpaca->kvm_hstate.kvm_vcore = vc; + tpaca->kvm_hstate.napping = 0; + vcpu->cpu = vc->pcpu; smp_wmb(); #ifdef CONFIG_PPC_ICP_NATIVE if (vcpu->arch.ptid) { tpaca->cpu_start = 0x80; - tpaca->kvm_hstate.in_guest = KVM_GUEST_MODE_GUEST; wmb(); xics_wake_cpu(cpu); ++vc->n_woken; @@ -634,9 +586,10 @@ static int on_primary_thread(void) */ static int kvmppc_run_core(struct kvmppc_vcore *vc) { - struct kvm_vcpu *vcpu, *vnext; + struct kvm_vcpu *vcpu, *vcpu0, *vnext; long ret; u64 now; + int ptid; /* don't start if any threads have a signal pending */ list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) @@ -655,29 +608,50 @@ static int kvmppc_run_core(struct kvmppc_vcore *vc) goto out; } + /* + * Assign physical thread IDs, first to non-ceded vcpus + * and then to ceded ones. + */ + ptid = 0; + vcpu0 = NULL; + list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) { + if (!vcpu->arch.ceded) { + if (!ptid) + vcpu0 = vcpu; + vcpu->arch.ptid = ptid++; + } + } + if (!vcpu0) + return 0; /* nothing to run */ + list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) + if (vcpu->arch.ceded) + vcpu->arch.ptid = ptid++; + vc->n_woken = 0; vc->nap_count = 0; vc->entry_exit_count = 0; - vc->vcore_running = 1; + vc->vcore_state = VCORE_RUNNING; vc->in_guest = 0; vc->pcpu = smp_processor_id(); + vc->napping_threads = 0; list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) kvmppc_start_thread(vcpu); - vcpu = list_first_entry(&vc->runnable_threads, struct kvm_vcpu, - arch.run_list); + preempt_disable(); spin_unlock(&vc->lock); - preempt_disable(); kvm_guest_enter(); - __kvmppc_vcore_entry(NULL, vcpu); + __kvmppc_vcore_entry(NULL, vcpu0); - /* wait for secondary threads to finish writing their state to memory */ spin_lock(&vc->lock); + /* disable sending of IPIs on virtual external irqs */ + list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) + vcpu->cpu = -1; + /* wait for secondary threads to finish writing their state to memory */ if (vc->nap_count < vc->n_woken) kvmppc_wait_for_nap(vc); /* prevent other vcpu threads from doing kvmppc_start_thread() now */ - vc->vcore_running = 2; + vc->vcore_state = VCORE_EXITING; spin_unlock(&vc->lock); /* make sure updates to secondary vcpu structs are visible now */ @@ -693,22 +667,26 @@ static int kvmppc_run_core(struct kvmppc_vcore *vc) if (now < vcpu->arch.dec_expires && kvmppc_core_pending_dec(vcpu)) kvmppc_core_dequeue_dec(vcpu); - if (!vcpu->arch.trap) { - if (signal_pending(vcpu->arch.run_task)) { - vcpu->arch.kvm_run->exit_reason = KVM_EXIT_INTR; - vcpu->arch.ret = -EINTR; - } - continue; /* didn't get to run */ - } - ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu, - vcpu->arch.run_task); + + ret = RESUME_GUEST; + if (vcpu->arch.trap) + ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu, + vcpu->arch.run_task); + vcpu->arch.ret = ret; vcpu->arch.trap = 0; + + if (vcpu->arch.ceded) { + if (ret != RESUME_GUEST) + kvmppc_end_cede(vcpu); + else + kvmppc_set_timer(vcpu); + } } spin_lock(&vc->lock); out: - vc->vcore_running = 0; + vc->vcore_state = VCORE_INACTIVE; list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads, arch.run_list) { if (vcpu->arch.ret != RESUME_GUEST) { @@ -720,82 +698,130 @@ static int kvmppc_run_core(struct kvmppc_vcore *vc) return 1; } -static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) +/* + * Wait for some other vcpu thread to execute us, and + * wake us up when we need to handle something in the host. + */ +static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state) { - int ptid; - int wait_state; - struct kvmppc_vcore *vc; DEFINE_WAIT(wait); - /* No need to go into the guest when all we do is going out */ - if (signal_pending(current)) { - kvm_run->exit_reason = KVM_EXIT_INTR; - return -EINTR; + prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state); + if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) + schedule(); + finish_wait(&vcpu->arch.cpu_run, &wait); +} + +/* + * All the vcpus in this vcore are idle, so wait for a decrementer + * or external interrupt to one of the vcpus. vc->lock is held. + */ +static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc) +{ + DEFINE_WAIT(wait); + struct kvm_vcpu *v; + int all_idle = 1; + + prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE); + vc->vcore_state = VCORE_SLEEPING; + spin_unlock(&vc->lock); + list_for_each_entry(v, &vc->runnable_threads, arch.run_list) { + if (!v->arch.ceded || v->arch.pending_exceptions) { + all_idle = 0; + break; + } } + if (all_idle) + schedule(); + finish_wait(&vc->wq, &wait); + spin_lock(&vc->lock); + vc->vcore_state = VCORE_INACTIVE; +} - /* On PPC970, check that we have an RMA region */ - if (!vcpu->kvm->arch.rma && cpu_has_feature(CPU_FTR_ARCH_201)) - return -EPERM; +static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) +{ + int n_ceded; + int prev_state; + struct kvmppc_vcore *vc; + struct kvm_vcpu *v, *vn; kvm_run->exit_reason = 0; vcpu->arch.ret = RESUME_GUEST; vcpu->arch.trap = 0; - flush_fp_to_thread(current); - flush_altivec_to_thread(current); - flush_vsx_to_thread(current); - /* * Synchronize with other threads in this virtual core */ vc = vcpu->arch.vcore; spin_lock(&vc->lock); - /* This happens the first time this is called for a vcpu */ - if (vcpu->arch.state == KVMPPC_VCPU_BLOCKED) - --vc->n_blocked; - vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; - ptid = vc->n_runnable; + vcpu->arch.ceded = 0; vcpu->arch.run_task = current; vcpu->arch.kvm_run = kvm_run; - vcpu->arch.ptid = ptid; + prev_state = vcpu->arch.state; + vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads); ++vc->n_runnable; - wait_state = TASK_INTERRUPTIBLE; - while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { - if (signal_pending(current)) { - if (!vc->vcore_running) { - kvm_run->exit_reason = KVM_EXIT_INTR; - vcpu->arch.ret = -EINTR; - break; - } - /* have to wait for vcore to stop executing guest */ - wait_state = TASK_UNINTERRUPTIBLE; - smp_send_reschedule(vc->pcpu); + /* + * This happens the first time this is called for a vcpu. + * If the vcore is already running, we may be able to start + * this thread straight away and have it join in. + */ + if (prev_state == KVMPPC_VCPU_STOPPED) { + if (vc->vcore_state == VCORE_RUNNING && + VCORE_EXIT_COUNT(vc) == 0) { + vcpu->arch.ptid = vc->n_runnable - 1; + kvmppc_start_thread(vcpu); } - if (!vc->vcore_running && - vc->n_runnable + vc->n_blocked == vc->num_threads) { - /* we can run now */ - if (kvmppc_run_core(vc)) - continue; - } + } else if (prev_state == KVMPPC_VCPU_BUSY_IN_HOST) + --vc->n_busy; - if (vc->vcore_running == 1 && VCORE_EXIT_COUNT(vc) == 0) - kvmppc_start_thread(vcpu); + while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && + !signal_pending(current)) { + if (vc->n_busy || vc->vcore_state != VCORE_INACTIVE) { + spin_unlock(&vc->lock); + kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE); + spin_lock(&vc->lock); + continue; + } + n_ceded = 0; + list_for_each_entry(v, &vc->runnable_threads, arch.run_list) + n_ceded += v->arch.ceded; + if (n_ceded == vc->n_runnable) + kvmppc_vcore_blocked(vc); + else + kvmppc_run_core(vc); + + list_for_each_entry_safe(v, vn, &vc->runnable_threads, + arch.run_list) { + kvmppc_core_deliver_interrupts(v); + if (signal_pending(v->arch.run_task)) { + kvmppc_remove_runnable(vc, v); + v->stat.signal_exits++; + v->arch.kvm_run->exit_reason = KVM_EXIT_INTR; + v->arch.ret = -EINTR; + wake_up(&v->arch.cpu_run); + } + } + } - /* wait for other threads to come in, or wait for vcore */ - prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state); - spin_unlock(&vc->lock); - schedule(); - finish_wait(&vcpu->arch.cpu_run, &wait); - spin_lock(&vc->lock); + if (signal_pending(current)) { + if (vc->vcore_state == VCORE_RUNNING || + vc->vcore_state == VCORE_EXITING) { + spin_unlock(&vc->lock); + kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE); + spin_lock(&vc->lock); + } + if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { + kvmppc_remove_runnable(vc, vcpu); + vcpu->stat.signal_exits++; + kvm_run->exit_reason = KVM_EXIT_INTR; + vcpu->arch.ret = -EINTR; + } } - if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) - kvmppc_remove_runnable(vc, vcpu); spin_unlock(&vc->lock); - return vcpu->arch.ret; } @@ -808,6 +834,21 @@ int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) return -EINVAL; } + /* No need to go into the guest when all we'll do is come back out */ + if (signal_pending(current)) { + run->exit_reason = KVM_EXIT_INTR; + return -EINTR; + } + + /* On PPC970, check that we have an RMA region */ + if (!vcpu->kvm->arch.rma && cpu_has_feature(CPU_FTR_ARCH_201)) + return -EPERM; + + flush_fp_to_thread(current); + flush_altivec_to_thread(current); + flush_vsx_to_thread(current); + vcpu->arch.wqp = &vcpu->arch.vcore->wq; + do { r = kvmppc_run_vcpu(run, vcpu); diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index bc6ade93308..f422231d923 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -52,7 +52,7 @@ kvmppc_skip_Hinterrupt: b . /* - * Call kvmppc_handler_trampoline_enter in real mode. + * Call kvmppc_hv_entry in real mode. * Must be called with interrupts hard-disabled. * * Input Registers: @@ -92,6 +92,12 @@ _GLOBAL(kvmppc_hv_entry_trampoline) kvm_start_guest: ld r1,PACAEMERGSP(r13) subi r1,r1,STACK_FRAME_OVERHEAD + ld r2,PACATOC(r13) + + /* were we napping due to cede? */ + lbz r0,HSTATE_NAPPING(r13) + cmpwi r0,0 + bne kvm_end_cede /* get vcpu pointer */ ld r4, HSTATE_KVM_VCPU(r13) @@ -279,15 +285,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) cmpwi r0,0 beq 20b - /* Set LPCR. Set the MER bit if there is a pending external irq. */ + /* Set LPCR and RMOR. */ 10: ld r8,KVM_LPCR(r9) - ld r0,VCPU_PENDING_EXC(r4) - li r7,(1 << BOOK3S_IRQPRIO_EXTERNAL) - oris r7,r7,(1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h - and. r0,r0,r7 - beq 11f - ori r8,r8,LPCR_MER -11: mtspr SPRN_LPCR,r8 + mtspr SPRN_LPCR,r8 ld r8,KVM_RMOR(r9) mtspr SPRN_RMOR,r8 isync @@ -451,19 +451,50 @@ toc_tlbie_lock: mtctr r6 mtxer r7 - /* Move SRR0 and SRR1 into the respective regs */ +kvmppc_cede_reentry: /* r4 = vcpu, r13 = paca */ ld r6, VCPU_SRR0(r4) ld r7, VCPU_SRR1(r4) - mtspr SPRN_SRR0, r6 - mtspr SPRN_SRR1, r7 - ld r10, VCPU_PC(r4) + ld r11, VCPU_MSR(r4) /* r11 = vcpu->arch.msr & ~MSR_HV */ - ld r11, VCPU_MSR(r4) /* r10 = vcpu->arch.msr & ~MSR_HV */ rldicl r11, r11, 63 - MSR_HV_LG, 1 rotldi r11, r11, 1 + MSR_HV_LG ori r11, r11, MSR_ME + /* Check if we can deliver an external or decrementer interrupt now */ + ld r0,VCPU_PENDING_EXC(r4) + li r8,(1 << BOOK3S_IRQPRIO_EXTERNAL) + oris r8,r8,(1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h + and r0,r0,r8 + cmpdi cr1,r0,0 + andi. r0,r11,MSR_EE + beq cr1,11f +BEGIN_FTR_SECTION + mfspr r8,SPRN_LPCR + ori r8,r8,LPCR_MER + mtspr SPRN_LPCR,r8 + isync +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) + beq 5f + li r0,BOOK3S_INTERRUPT_EXTERNAL +12: mr r6,r10 + mr r10,r0 + mr r7,r11 + li r11,(MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ + rotldi r11,r11,63 + b 5f +11: beq 5f + mfspr r0,SPRN_DEC + cmpwi r0,0 + li r0,BOOK3S_INTERRUPT_DECREMENTER + blt 12b + + /* Move SRR0 and SRR1 into the respective regs */ +5: mtspr SPRN_SRR0, r6 + mtspr SPRN_SRR1, r7 + li r0,0 + stb r0,VCPU_CEDED(r4) /* cancel cede */ + fast_guest_return: mtspr SPRN_HSRR0,r10 mtspr SPRN_HSRR1,r11 @@ -577,21 +608,20 @@ kvmppc_interrupt: /* See if this is something we can handle in real mode */ cmpwi r12,BOOK3S_INTERRUPT_SYSCALL beq hcall_try_real_mode -hcall_real_cont: /* Check for mediated interrupts (could be done earlier really ...) */ BEGIN_FTR_SECTION cmpwi r12,BOOK3S_INTERRUPT_EXTERNAL bne+ 1f - ld r5,VCPU_KVM(r9) - ld r5,KVM_LPCR(r5) andi. r0,r11,MSR_EE beq 1f + mfspr r5,SPRN_LPCR andi. r0,r5,LPCR_MER bne bounce_ext_interrupt 1: END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) +hcall_real_cont: /* r9 = vcpu, r12 = trap, r13 = paca */ /* Save DEC */ mfspr r5,SPRN_DEC mftb r6 @@ -685,7 +715,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_201) slbia ptesync -hdec_soon: +hdec_soon: /* r9 = vcpu, r12 = trap, r13 = paca */ BEGIN_FTR_SECTION b 32f END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) @@ -703,6 +733,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) addi r0,r3,0x100 stwcx. r0,0,r6 bne 41b + lwsync /* * At this point we have an interrupt that we have to pass @@ -716,18 +747,39 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) * interrupt, since the other threads will already be on their * way here in that case. */ + cmpwi r3,0x100 /* Are we the first here? */ + bge 43f + cmpwi r3,1 /* Are any other threads in the guest? */ + ble 43f cmpwi r12,BOOK3S_INTERRUPT_HV_DECREMENTER beq 40f - cmpwi r3,0x100 /* Are we the first here? */ - bge 40f - cmpwi r3,1 - ble 40f li r0,0 mtspr SPRN_HDEC,r0 40: + /* + * Send an IPI to any napping threads, since an HDEC interrupt + * doesn't wake CPUs up from nap. + */ + lwz r3,VCORE_NAPPING_THREADS(r5) + lwz r4,VCPU_PTID(r9) + li r0,1 + sldi r0,r0,r4 + andc. r3,r3,r0 /* no sense IPI'ing ourselves */ + beq 43f + mulli r4,r4,PACA_SIZE /* get paca for thread 0 */ + subf r6,r4,r13 +42: andi. r0,r3,1 + beq 44f + ld r8,HSTATE_XICS_PHYS(r6) /* get thread's XICS reg addr */ + li r0,IPI_PRIORITY + li r7,XICS_QIRR + stbcix r0,r7,r8 /* trigger the IPI */ +44: srdi. r3,r3,1 + addi r6,r6,PACA_SIZE + bne 42b /* Secondary threads wait for primary to do partition switch */ - ld r4,VCPU_KVM(r9) /* pointer to struct kvm */ +43: ld r4,VCPU_KVM(r9) /* pointer to struct kvm */ ld r5,HSTATE_KVM_VCORE(r13) lwz r3,VCPU_PTID(r9) cmpwi r3,0 @@ -1080,7 +1132,6 @@ hcall_try_real_mode: hcall_real_fallback: li r12,BOOK3S_INTERRUPT_SYSCALL ld r9, HSTATE_KVM_VCPU(r13) - ld r11, VCPU_MSR(r9) b hcall_real_cont @@ -1142,7 +1193,7 @@ hcall_real_table: .long 0 /* 0xd4 */ .long 0 /* 0xd8 */ .long 0 /* 0xdc */ - .long 0 /* 0xe0 */ + .long .kvmppc_h_cede - hcall_real_table .long 0 /* 0xe4 */ .long 0 /* 0xe8 */ .long 0 /* 0xec */ @@ -1171,7 +1222,8 @@ bounce_ext_interrupt: mtspr SPRN_SRR0,r10 mtspr SPRN_SRR1,r11 li r10,BOOK3S_INTERRUPT_EXTERNAL - LOAD_REG_IMMEDIATE(r11,MSR_SF | MSR_ME); + li r11,(MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ + rotldi r11,r11,63 b fast_guest_return _GLOBAL(kvmppc_h_set_dabr) @@ -1180,6 +1232,178 @@ _GLOBAL(kvmppc_h_set_dabr) li r3,0 blr +_GLOBAL(kvmppc_h_cede) + ori r11,r11,MSR_EE + std r11,VCPU_MSR(r3) + li r0,1 + stb r0,VCPU_CEDED(r3) + sync /* order setting ceded vs. testing prodded */ + lbz r5,VCPU_PRODDED(r3) + cmpwi r5,0 + bne 1f + li r0,0 /* set trap to 0 to say hcall is handled */ + stw r0,VCPU_TRAP(r3) + li r0,H_SUCCESS + std r0,VCPU_GPR(r3)(r3) +BEGIN_FTR_SECTION + b 2f /* just send it up to host on 970 */ +END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_206) + + /* + * Set our bit in the bitmask of napping threads unless all the + * other threads are already napping, in which case we send this + * up to the host. + */ + ld r5,HSTATE_KVM_VCORE(r13) + lwz r6,VCPU_PTID(r3) + lwz r8,VCORE_ENTRY_EXIT(r5) + clrldi r8,r8,56 + li r0,1 + sld r0,r0,r6 + addi r6,r5,VCORE_NAPPING_THREADS +31: lwarx r4,0,r6 + or r4,r4,r0 + popcntw r7,r4 + cmpw r7,r8 + bge 2f + stwcx. r4,0,r6 + bne 31b + li r0,1 + stb r0,HSTATE_NAPPING(r13) + /* order napping_threads update vs testing entry_exit_count */ + lwsync + mr r4,r3 + lwz r7,VCORE_ENTRY_EXIT(r5) + cmpwi r7,0x100 + bge 33f /* another thread already exiting */ + +/* + * Although not specifically required by the architecture, POWER7 + * preserves the following registers in nap mode, even if an SMT mode + * switch occurs: SLB entries, PURR, SPURR, AMOR, UAMOR, AMR, SPRG0-3, + * DAR, DSISR, DABR, DABRX, DSCR, PMCx, MMCRx, SIAR, SDAR. + */ + /* Save non-volatile GPRs */ + std r14, VCPU_GPR(r14)(r3) + std r15, VCPU_GPR(r15)(r3) + std r16, VCPU_GPR(r16)(r3) + std r17, VCPU_GPR(r17)(r3) + std r18, VCPU_GPR(r18)(r3) + std r19, VCPU_GPR(r19)(r3) + std r20, VCPU_GPR(r20)(r3) + std r21, VCPU_GPR(r21)(r3) + std r22, VCPU_GPR(r22)(r3) + std r23, VCPU_GPR(r23)(r3) + std r24, VCPU_GPR(r24)(r3) + std r25, VCPU_GPR(r25)(r3) + std r26, VCPU_GPR(r26)(r3) + std r27, VCPU_GPR(r27)(r3) + std r28, VCPU_GPR(r28)(r3) + std r29, VCPU_GPR(r29)(r3) + std r30, VCPU_GPR(r30)(r3) + std r31, VCPU_GPR(r31)(r3) + + /* save FP state */ + bl .kvmppc_save_fp + + /* + * Take a nap until a decrementer or external interrupt occurs, + * with PECE1 (wake on decr) and PECE0 (wake on external) set in LPCR + */ + li r0,0x80 + stb r0,PACAPROCSTART(r13) + mfspr r5,SPRN_LPCR + ori r5,r5,LPCR_PECE0 | LPCR_PECE1 + mtspr SPRN_LPCR,r5 + isync + li r0, 0 + std r0, HSTATE_SCRATCH0(r13) + ptesync + ld r0, HSTATE_SCRATCH0(r13) +1: cmpd r0, r0 + bne 1b + nap + b . + +kvm_end_cede: + /* Woken by external or decrementer interrupt */ + ld r1, HSTATE_HOST_R1(r13) + ld r2, PACATOC(r13) + + /* If we're a secondary thread and we got here by an IPI, ack it */ + ld r4,HSTATE_KVM_VCPU(r13) + lwz r3,VCPU_PTID(r4) + cmpwi r3,0 + beq 27f + mfspr r3,SPRN_SRR1 + rlwinm r3,r3,44-31,0x7 /* extract wake reason field */ + cmpwi r3,4 /* was it an external interrupt? */ + bne 27f + ld r5, HSTATE_XICS_PHYS(r13) + li r0,0xff + li r6,XICS_QIRR + li r7,XICS_XIRR + lwzcix r8,r5,r7 /* ack the interrupt */ + sync + stbcix r0,r5,r6 /* clear it */ + stwcix r8,r5,r7 /* EOI it */ +27: + /* load up FP state */ + bl kvmppc_load_fp + + /* Load NV GPRS */ + ld r14, VCPU_GPR(r14)(r4) + ld r15, VCPU_GPR(r15)(r4) + ld r16, VCPU_GPR(r16)(r4) + ld r17, VCPU_GPR(r17)(r4) + ld r18, VCPU_GPR(r18)(r4) + ld r19, VCPU_GPR(r19)(r4) + ld r20, VCPU_GPR(r20)(r4) + ld r21, VCPU_GPR(r21)(r4) + ld r22, VCPU_GPR(r22)(r4) + ld r23, VCPU_GPR(r23)(r4) + ld r24, VCPU_GPR(r24)(r4) + ld r25, VCPU_GPR(r25)(r4) + ld r26, VCPU_GPR(r26)(r4) + ld r27, VCPU_GPR(r27)(r4) + ld r28, VCPU_GPR(r28)(r4) + ld r29, VCPU_GPR(r29)(r4) + ld r30, VCPU_GPR(r30)(r4) + ld r31, VCPU_GPR(r31)(r4) + + /* clear our bit in vcore->napping_threads */ +33: ld r5,HSTATE_KVM_VCORE(r13) + lwz r3,VCPU_PTID(r4) + li r0,1 + sld r0,r0,r3 + addi r6,r5,VCORE_NAPPING_THREADS +32: lwarx r7,0,r6 + andc r7,r7,r0 + stwcx. r7,0,r6 + bne 32b + li r0,0 + stb r0,HSTATE_NAPPING(r13) + + /* see if any other thread is already exiting */ + lwz r0,VCORE_ENTRY_EXIT(r5) + cmpwi r0,0x100 + blt kvmppc_cede_reentry /* if not go back to guest */ + + /* some threads are exiting, so go to the guest exit path */ + b hcall_real_fallback + + /* cede when already previously prodded case */ +1: li r0,0 + stb r0,VCPU_PRODDED(r3) + sync /* order testing prodded vs. clearing ceded */ + stb r0,VCPU_CEDED(r3) + li r3,H_SUCCESS + blr + + /* we've ceded but we want to give control to the host */ +2: li r3,H_TOO_HARD + blr + secondary_too_late: ld r5,HSTATE_KVM_VCORE(r13) HMT_LOW @@ -1197,14 +1421,20 @@ secondary_too_late: slbmte r6,r5 1: addi r11,r11,16 .endr - b 50f secondary_nap: - /* Clear any pending IPI */ -50: ld r5, HSTATE_XICS_PHYS(r13) + /* Clear any pending IPI - assume we're a secondary thread */ + ld r5, HSTATE_XICS_PHYS(r13) + li r7, XICS_XIRR + lwzcix r3, r5, r7 /* ack any pending interrupt */ + rlwinm. r0, r3, 0, 0xffffff /* any pending? */ + beq 37f + sync li r0, 0xff li r6, XICS_QIRR - stbcix r0, r5, r6 + stbcix r0, r5, r6 /* clear the IPI */ + stwcix r3, r5, r7 /* EOI it */ +37: sync /* increment the nap count and then go to nap mode */ ld r4, HSTATE_KVM_VCORE(r13) @@ -1214,13 +1444,12 @@ secondary_nap: addi r3, r3, 1 stwcx. r3, 0, r4 bne 51b - isync + li r3, LPCR_PECE0 mfspr r4, SPRN_LPCR - li r0, LPCR_PECE - andc r4, r4, r0 - ori r4, r4, LPCR_PECE0 /* exit nap on interrupt */ + rlwimi r4, r3, 0, LPCR_PECE0 | LPCR_PECE1 mtspr SPRN_LPCR, r4 + isync li r0, 0 std r0, HSTATE_SCRATCH0(r13) ptesync diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index a8000ce562b..0d843c6ba31 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -39,12 +39,8 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) { -#ifndef CONFIG_KVM_BOOK3S_64_HV return !(v->arch.shared->msr & MSR_WE) || !!(v->arch.pending_exceptions); -#else - return !(v->arch.ceded) || !!(v->arch.pending_exceptions); -#endif } int kvmppc_kvm_pv(struct kvm_vcpu *vcpu) @@ -285,6 +281,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) { struct kvm_vcpu *vcpu; vcpu = kvmppc_core_vcpu_create(kvm, id); + vcpu->arch.wqp = &vcpu->wq; if (!IS_ERR(vcpu)) kvmppc_create_vcpu_debugfs(vcpu, id); return vcpu; @@ -316,8 +313,8 @@ static void kvmppc_decrementer_func(unsigned long data) kvmppc_core_queue_dec(vcpu); - if (waitqueue_active(&vcpu->wq)) { - wake_up_interruptible(&vcpu->wq); + if (waitqueue_active(vcpu->arch.wqp)) { + wake_up_interruptible(vcpu->arch.wqp); vcpu->stat.halt_wakeup++; } } @@ -570,13 +567,15 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) { - if (irq->irq == KVM_INTERRUPT_UNSET) + if (irq->irq == KVM_INTERRUPT_UNSET) { kvmppc_core_dequeue_external(vcpu, irq); - else - kvmppc_core_queue_external(vcpu, irq); + return 0; + } + + kvmppc_core_queue_external(vcpu, irq); - if (waitqueue_active(&vcpu->wq)) { - wake_up_interruptible(&vcpu->wq); + if (waitqueue_active(vcpu->arch.wqp)) { + wake_up_interruptible(vcpu->arch.wqp); vcpu->stat.halt_wakeup++; } else if (vcpu->cpu != -1) { smp_send_reschedule(vcpu->cpu); |