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-rw-r--r--arch/arm/include/asm/idmap.h1
-rw-r--r--arch/arm/include/asm/kvm_host.h47
-rw-r--r--arch/arm/include/asm/kvm_mmu.h28
-rw-r--r--arch/arm/kernel/asm-offsets.c2
-rw-r--r--arch/arm/kernel/vmlinux.lds.S7
-rw-r--r--arch/arm/kvm/Kconfig6
-rw-r--r--arch/arm/kvm/Makefile2
-rw-r--r--arch/arm/kvm/arch_timer.c7
-rw-r--r--arch/arm/kvm/arm.c129
-rw-r--r--arch/arm/kvm/init.S78
-rw-r--r--arch/arm/kvm/mmu.c455
-rw-r--r--arch/arm/kvm/perf.c68
-rw-r--r--arch/arm/mm/idmap.c32
13 files changed, 530 insertions, 332 deletions
diff --git a/arch/arm/include/asm/idmap.h b/arch/arm/include/asm/idmap.h
index 1a66f907e5cc..bf863edb517d 100644
--- a/arch/arm/include/asm/idmap.h
+++ b/arch/arm/include/asm/idmap.h
@@ -8,7 +8,6 @@
#define __idmap __section(.idmap.text) noinline notrace
extern pgd_t *idmap_pgd;
-extern pgd_t *hyp_pgd;
void setup_mm_for_reboot(void);
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 0c4e643d939e..57cb786a6203 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -87,7 +87,7 @@ struct kvm_vcpu_fault_info {
u32 hyp_pc; /* PC when exception was taken from Hyp mode */
};
-typedef struct vfp_hard_struct kvm_kernel_vfp_t;
+typedef struct vfp_hard_struct kvm_cpu_context_t;
struct kvm_vcpu_arch {
struct kvm_regs regs;
@@ -105,8 +105,10 @@ struct kvm_vcpu_arch {
struct kvm_vcpu_fault_info fault;
/* Floating point registers (VFP and Advanced SIMD/NEON) */
- kvm_kernel_vfp_t vfp_guest;
- kvm_kernel_vfp_t *vfp_host;
+ struct vfp_hard_struct vfp_guest;
+
+ /* Host FP context */
+ kvm_cpu_context_t *host_cpu_context;
/* VGIC state */
struct vgic_cpu vgic_cpu;
@@ -188,23 +190,38 @@ int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
int exception_index);
-static inline void __cpu_init_hyp_mode(unsigned long long pgd_ptr,
+static inline void __cpu_init_hyp_mode(unsigned long long boot_pgd_ptr,
+ unsigned long long pgd_ptr,
unsigned long hyp_stack_ptr,
unsigned long vector_ptr)
{
- unsigned long pgd_low, pgd_high;
-
- pgd_low = (pgd_ptr & ((1ULL << 32) - 1));
- pgd_high = (pgd_ptr >> 32ULL);
-
/*
- * Call initialization code, and switch to the full blown
- * HYP code. The init code doesn't need to preserve these registers as
- * r1-r3 and r12 are already callee save according to the AAPCS.
- * Note that we slightly misuse the prototype by casing the pgd_low to
- * a void *.
+ * Call initialization code, and switch to the full blown HYP
+ * code. The init code doesn't need to preserve these
+ * registers as r0-r3 are already callee saved according to
+ * the AAPCS.
+ * Note that we slightly misuse the prototype by casing the
+ * stack pointer to a void *.
+ *
+ * We don't have enough registers to perform the full init in
+ * one go. Install the boot PGD first, and then install the
+ * runtime PGD, stack pointer and vectors. The PGDs are always
+ * passed as the third argument, in order to be passed into
+ * r2-r3 to the init code (yes, this is compliant with the
+ * PCS!).
*/
- kvm_call_hyp((void *)pgd_low, pgd_high, hyp_stack_ptr, vector_ptr);
+
+ kvm_call_hyp(NULL, 0, boot_pgd_ptr);
+
+ kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
}
+static inline int kvm_arch_dev_ioctl_check_extension(long ext)
+{
+ return 0;
+}
+
+int kvm_perf_init(void);
+int kvm_perf_teardown(void);
+
#endif /* __ARM_KVM_HOST_H__ */
diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index 970f3b5fa109..472ac7091003 100644
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -19,21 +19,33 @@
#ifndef __ARM_KVM_MMU_H__
#define __ARM_KVM_MMU_H__
-#include <asm/cacheflush.h>
-#include <asm/pgalloc.h>
-#include <asm/idmap.h>
+#include <asm/memory.h>
+#include <asm/page.h>
/*
* We directly use the kernel VA for the HYP, as we can directly share
* the mapping (HTTBR "covers" TTBR1).
*/
-#define HYP_PAGE_OFFSET_MASK (~0UL)
+#define HYP_PAGE_OFFSET_MASK UL(~0)
#define HYP_PAGE_OFFSET PAGE_OFFSET
#define KERN_TO_HYP(kva) (kva)
+/*
+ * Our virtual mapping for the boot-time MMU-enable code. Must be
+ * shared across all the page-tables. Conveniently, we use the vectors
+ * page, where no kernel data will ever be shared with HYP.
+ */
+#define TRAMPOLINE_VA UL(CONFIG_VECTORS_BASE)
+
+#ifndef __ASSEMBLY__
+
+#include <asm/cacheflush.h>
+#include <asm/pgalloc.h>
+
int create_hyp_mappings(void *from, void *to);
int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
-void free_hyp_pmds(void);
+void free_boot_hyp_pgd(void);
+void free_hyp_pgds(void);
int kvm_alloc_stage2_pgd(struct kvm *kvm);
void kvm_free_stage2_pgd(struct kvm *kvm);
@@ -45,6 +57,8 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run);
void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
phys_addr_t kvm_mmu_get_httbr(void);
+phys_addr_t kvm_mmu_get_boot_httbr(void);
+phys_addr_t kvm_get_idmap_vector(void);
int kvm_mmu_init(void);
void kvm_clear_hyp_idmap(void);
@@ -114,4 +128,8 @@ static inline void coherent_icache_guest_page(struct kvm *kvm, gfn_t gfn)
}
}
+#define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l))
+
+#endif /* !__ASSEMBLY__ */
+
#endif /* __ARM_KVM_MMU_H__ */
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index a53efa993690..ee68cce6b48e 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -158,7 +158,7 @@ int main(void)
DEFINE(VCPU_MIDR, offsetof(struct kvm_vcpu, arch.midr));
DEFINE(VCPU_CP15, offsetof(struct kvm_vcpu, arch.cp15));
DEFINE(VCPU_VFP_GUEST, offsetof(struct kvm_vcpu, arch.vfp_guest));
- DEFINE(VCPU_VFP_HOST, offsetof(struct kvm_vcpu, arch.vfp_host));
+ DEFINE(VCPU_VFP_HOST, offsetof(struct kvm_vcpu, arch.host_cpu_context));
DEFINE(VCPU_REGS, offsetof(struct kvm_vcpu, arch.regs));
DEFINE(VCPU_USR_REGS, offsetof(struct kvm_vcpu, arch.regs.usr_regs));
DEFINE(VCPU_SVC_REGS, offsetof(struct kvm_vcpu, arch.regs.svc_regs));
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index b571484e9f03..a871b8e00fca 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -20,7 +20,7 @@
VMLINUX_SYMBOL(__idmap_text_start) = .; \
*(.idmap.text) \
VMLINUX_SYMBOL(__idmap_text_end) = .; \
- ALIGN_FUNCTION(); \
+ . = ALIGN(32); \
VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
*(.hyp.idmap.text) \
VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
@@ -315,3 +315,8 @@ SECTIONS
*/
ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
+/*
+ * The HYP init code can't be more than a page long.
+ * The above comment applies as well.
+ */
+ASSERT(((__hyp_idmap_text_end - __hyp_idmap_text_start) <= PAGE_SIZE), "HYP init code too big")
diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index 49dd64e579c2..370e1a8af6ac 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -41,9 +41,9 @@ config KVM_ARM_HOST
Provides host support for ARM processors.
config KVM_ARM_MAX_VCPUS
- int "Number maximum supported virtual CPUs per VM"
- depends on KVM_ARM_HOST
- default 4
+ int "Number maximum supported virtual CPUs per VM" if KVM_ARM_HOST
+ default 4 if KVM_ARM_HOST
+ default 0
help
Static number of max supported virtual CPUs per VM.
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index 8dc5e76cb789..53c5ed83d16f 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -18,6 +18,6 @@ kvm-arm-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o)
obj-y += kvm-arm.o init.o interrupts.o
obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o
-obj-y += coproc.o coproc_a15.o mmio.o psci.o
+obj-y += coproc.o coproc_a15.o mmio.o psci.o perf.o
obj-$(CONFIG_KVM_ARM_VGIC) += vgic.o
obj-$(CONFIG_KVM_ARM_TIMER) += arch_timer.o
diff --git a/arch/arm/kvm/arch_timer.c b/arch/arm/kvm/arch_timer.c
index 6ac938d46297..c55b6089e923 100644
--- a/arch/arm/kvm/arch_timer.c
+++ b/arch/arm/kvm/arch_timer.c
@@ -22,6 +22,7 @@
#include <linux/kvm_host.h>
#include <linux/interrupt.h>
+#include <clocksource/arm_arch_timer.h>
#include <asm/arch_timer.h>
#include <asm/kvm_vgic.h>
@@ -64,7 +65,7 @@ static void kvm_timer_inject_irq(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
- timer->cntv_ctl |= 1 << 1; /* Mask the interrupt in the guest */
+ timer->cntv_ctl |= ARCH_TIMER_CTRL_IT_MASK;
kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
vcpu->arch.timer_cpu.irq->irq,
vcpu->arch.timer_cpu.irq->level);
@@ -133,8 +134,8 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
cycle_t cval, now;
u64 ns;
- /* Check if the timer is enabled and unmasked first */
- if ((timer->cntv_ctl & 3) != 1)
+ if ((timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) ||
+ !(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE))
return;
cval = timer->cntv_cval;
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index a0dfc2a53f91..37d216d814cd 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -16,6 +16,7 @@
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
+#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
@@ -48,7 +49,7 @@ __asm__(".arch_extension virt");
#endif
static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
-static kvm_kernel_vfp_t __percpu *kvm_host_vfp_state;
+static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
static unsigned long hyp_default_vectors;
/* Per-CPU variable containing the currently running vcpu. */
@@ -206,7 +207,7 @@ int kvm_dev_ioctl_check_extension(long ext)
r = KVM_MAX_VCPUS;
break;
default:
- r = 0;
+ r = kvm_arch_dev_ioctl_check_extension(ext);
break;
}
return r;
@@ -218,27 +219,18 @@ long kvm_arch_dev_ioctl(struct file *filp,
return -EINVAL;
}
-int kvm_arch_set_memory_region(struct kvm *kvm,
- struct kvm_userspace_memory_region *mem,
- struct kvm_memory_slot old,
- int user_alloc)
-{
- return 0;
-}
-
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
- struct kvm_memory_slot old,
struct kvm_userspace_memory_region *mem,
- bool user_alloc)
+ enum kvm_mr_change change)
{
return 0;
}
void kvm_arch_commit_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
- struct kvm_memory_slot old,
- bool user_alloc)
+ const struct kvm_memory_slot *old,
+ enum kvm_mr_change change)
{
}
@@ -326,7 +318,7 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
vcpu->cpu = cpu;
- vcpu->arch.vfp_host = this_cpu_ptr(kvm_host_vfp_state);
+ vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
/*
* Check whether this vcpu requires the cache to be flushed on
@@ -639,7 +631,8 @@ static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
return 0;
}
-int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level)
+int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
+ bool line_status)
{
u32 irq = irq_level->irq;
unsigned int irq_type, vcpu_idx, irq_num;
@@ -794,30 +787,48 @@ long kvm_arch_vm_ioctl(struct file *filp,
}
}
-static void cpu_init_hyp_mode(void *vector)
+static void cpu_init_hyp_mode(void *dummy)
{
+ unsigned long long boot_pgd_ptr;
unsigned long long pgd_ptr;
unsigned long hyp_stack_ptr;
unsigned long stack_page;
unsigned long vector_ptr;
/* Switch from the HYP stub to our own HYP init vector */
- __hyp_set_vectors((unsigned long)vector);
+ __hyp_set_vectors(kvm_get_idmap_vector());
+ boot_pgd_ptr = (unsigned long long)kvm_mmu_get_boot_httbr();
pgd_ptr = (unsigned long long)kvm_mmu_get_httbr();
stack_page = __get_cpu_var(kvm_arm_hyp_stack_page);
hyp_stack_ptr = stack_page + PAGE_SIZE;
vector_ptr = (unsigned long)__kvm_hyp_vector;
- __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
+ __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
+}
+
+static int hyp_init_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *cpu)
+{
+ switch (action) {
+ case CPU_STARTING:
+ case CPU_STARTING_FROZEN:
+ cpu_init_hyp_mode(NULL);
+ break;
+ }
+
+ return NOTIFY_OK;
}
+static struct notifier_block hyp_init_cpu_nb = {
+ .notifier_call = hyp_init_cpu_notify,
+};
+
/**
* Inits Hyp-mode on all online CPUs
*/
static int init_hyp_mode(void)
{
- phys_addr_t init_phys_addr;
int cpu;
int err = 0;
@@ -850,24 +861,6 @@ static int init_hyp_mode(void)
}
/*
- * Execute the init code on each CPU.
- *
- * Note: The stack is not mapped yet, so don't do anything else than
- * initializing the hypervisor mode on each CPU using a local stack
- * space for temporary storage.
- */
- init_phys_addr = virt_to_phys(__kvm_hyp_init);
- for_each_online_cpu(cpu) {
- smp_call_function_single(cpu, cpu_init_hyp_mode,
- (void *)(long)init_phys_addr, 1);
- }
-
- /*
- * Unmap the identity mapping
- */
- kvm_clear_hyp_idmap();
-
- /*
* Map the Hyp-code called directly from the host
*/
err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
@@ -890,33 +883,38 @@ static int init_hyp_mode(void)
}
/*
- * Map the host VFP structures
+ * Map the host CPU structures
*/
- kvm_host_vfp_state = alloc_percpu(kvm_kernel_vfp_t);
- if (!kvm_host_vfp_state) {
+ kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
+ if (!kvm_host_cpu_state) {
err = -ENOMEM;
- kvm_err("Cannot allocate host VFP state\n");
+ kvm_err("Cannot allocate host CPU state\n");
goto out_free_mappings;
}
for_each_possible_cpu(cpu) {
- kvm_kernel_vfp_t *vfp;
+ kvm_cpu_context_t *cpu_ctxt;
- vfp = per_cpu_ptr(kvm_host_vfp_state, cpu);
- err = create_hyp_mappings(vfp, vfp + 1);
+ cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
+ err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
if (err) {
- kvm_err("Cannot map host VFP state: %d\n", err);
- goto out_free_vfp;
+ kvm_err("Cannot map host CPU state: %d\n", err);
+ goto out_free_context;
}
}
/*
+ * Execute the init code on each CPU.
+ */
+ on_each_cpu(cpu_init_hyp_mode, NULL, 1);
+
+ /*
* Init HYP view of VGIC
*/
err = kvm_vgic_hyp_init();
if (err)
- goto out_free_vfp;
+ goto out_free_context;
#ifdef CONFIG_KVM_ARM_VGIC
vgic_present = true;
@@ -929,12 +927,19 @@ static int init_hyp_mode(void)
if (err)
goto out_free_mappings;
+#ifndef CONFIG_HOTPLUG_CPU
+ free_boot_hyp_pgd();
+#endif
+
+ kvm_perf_init();
+
kvm_info("Hyp mode initialized successfully\n");
+
return 0;
-out_free_vfp:
- free_percpu(kvm_host_vfp_state);
+out_free_context:
+ free_percpu(kvm_host_cpu_state);
out_free_mappings:
- free_hyp_pmds();
+ free_hyp_pgds();
out_free_stack_pages:
for_each_possible_cpu(cpu)
free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
@@ -943,27 +948,42 @@ out_err:
return err;
}
+static void check_kvm_target_cpu(void *ret)
+{
+ *(int *)ret = kvm_target_cpu();
+}
+
/**
* Initialize Hyp-mode and memory mappings on all CPUs.
*/
int kvm_arch_init(void *opaque)
{
int err;
+ int ret, cpu;
if (!is_hyp_mode_available()) {
kvm_err("HYP mode not available\n");
return -ENODEV;
}
- if (kvm_target_cpu() < 0) {
- kvm_err("Target CPU not supported!\n");
- return -ENODEV;
+ for_each_online_cpu(cpu) {
+ smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
+ if (ret < 0) {
+ kvm_err("Error, CPU %d not supported!\n", cpu);
+ return -ENODEV;
+ }
}
err = init_hyp_mode();
if (err)
goto out_err;
+ err = register_cpu_notifier(&hyp_init_cpu_nb);
+ if (err) {
+ kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
+ goto out_err;
+ }
+
kvm_coproc_table_init();
return 0;
out_err:
@@ -973,6 +993,7 @@ out_err:
/* NOP: Compiling as a module not supported */
void kvm_arch_exit(void)
{
+ kvm_perf_teardown();
}
static int arm_init(void)
diff --git a/arch/arm/kvm/init.S b/arch/arm/kvm/init.S
index 9f37a79b880b..f048338135f7 100644
--- a/arch/arm/kvm/init.S
+++ b/arch/arm/kvm/init.S
@@ -21,13 +21,33 @@
#include <asm/asm-offsets.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
/********************************************************************
* Hypervisor initialization
* - should be called with:
- * r0,r1 = Hypervisor pgd pointer
- * r2 = top of Hyp stack (kernel VA)
- * r3 = pointer to hyp vectors
+ * r0 = top of Hyp stack (kernel VA)
+ * r1 = pointer to hyp vectors
+ * r2,r3 = Hypervisor pgd pointer
+ *
+ * The init scenario is:
+ * - We jump in HYP with four parameters: boot HYP pgd, runtime HYP pgd,
+ * runtime stack, runtime vectors
+ * - Enable the MMU with the boot pgd
+ * - Jump to a target into the trampoline page (remember, this is the same
+ * physical page!)
+ * - Now switch to the runtime pgd (same VA, and still the same physical
+ * page!)
+ * - Invalidate TLBs
+ * - Set stack and vectors
+ * - Profit! (or eret, if you only care about the code).
+ *
+ * As we only have four registers available to pass parameters (and we
+ * need six), we split the init in two phases:
+ * - Phase 1: r0 = 0, r1 = 0, r2,r3 contain the boot PGD.
+ * Provides the basic HYP init, and enable the MMU.
+ * - Phase 2: r0 = ToS, r1 = vectors, r2,r3 contain the runtime PGD.
+ * Switches to the runtime PGD, set stack and vectors.
*/
.text
@@ -47,22 +67,25 @@ __kvm_hyp_init:
W(b) .
__do_hyp_init:
+ cmp r0, #0 @ We have a SP?
+ bne phase2 @ Yes, second stage init
+
@ Set the HTTBR to point to the hypervisor PGD pointer passed
- mcrr p15, 4, r0, r1, c2
+ mcrr p15, 4, r2, r3, c2
@ Set the HTCR and VTCR to the same shareability and cacheability
@ settings as the non-secure TTBCR and with T0SZ == 0.
mrc p15, 4, r0, c2, c0, 2 @ HTCR
- ldr r12, =HTCR_MASK
- bic r0, r0, r12
+ ldr r2, =HTCR_MASK
+ bic r0, r0, r2
mrc p15, 0, r1, c2, c0, 2 @ TTBCR
and r1, r1, #(HTCR_MASK & ~TTBCR_T0SZ)
orr r0, r0, r1
mcr p15, 4, r0, c2, c0, 2 @ HTCR
mrc p15, 4, r1, c2, c1, 2 @ VTCR
- ldr r12, =VTCR_MASK
- bic r1, r1, r12
+ ldr r2, =VTCR_MASK
+ bic r1, r1, r2
bic r0, r0, #(~VTCR_HTCR_SH) @ clear non-reusable HTCR bits
orr r1, r0, r1
orr r1, r1, #(KVM_VTCR_SL0 | KVM_VTCR_T0SZ | KVM_VTCR_S)
@@ -85,24 +108,41 @@ __do_hyp_init:
@ - Memory alignment checks: enabled
@ - MMU: enabled (this code must be run from an identity mapping)
mrc p15, 4, r0, c1, c0, 0 @ HSCR
- ldr r12, =HSCTLR_MASK
- bic r0, r0, r12
+ ldr r2, =HSCTLR_MASK
+ bic r0, r0, r2
mrc p15, 0, r1, c1, c0, 0 @ SCTLR
- ldr r12, =(HSCTLR_EE | HSCTLR_FI | HSCTLR_I | HSCTLR_C)
- and r1, r1, r12
- ARM( ldr r12, =(HSCTLR_M | HSCTLR_A) )
- THUMB( ldr r12, =(HSCTLR_M | HSCTLR_A | HSCTLR_TE) )
- orr r1, r1, r12
+ ldr r2, =(HSCTLR_EE | HSCTLR_FI | HSCTLR_I | HSCTLR_C)
+ and r1, r1, r2
+ ARM( ldr r2, =(HSCTLR_M | HSCTLR_A) )
+ THUMB( ldr r2, =(HSCTLR_M | HSCTLR_A | HSCTLR_TE) )
+ orr r1, r1, r2
orr r0, r0, r1
isb
mcr p15, 4, r0, c1, c0, 0 @ HSCR
- isb
- @ Set stack pointer and return to the kernel
- mov sp, r2
+ @ End of init phase-1
+ eret
+
+phase2:
+ @ Set stack pointer
+ mov sp, r0
@ Set HVBAR to point to the HYP vectors
- mcr p15, 4, r3, c12, c0, 0 @ HVBAR
+ mcr p15, 4, r1, c12, c0, 0 @ HVBAR
+
+ @ Jump to the trampoline page
+ ldr r0, =TRAMPOLINE_VA
+ adr r1, target
+ bfi r0, r1, #0, #PAGE_SHIFT
+ mov pc, r0
+
+target: @ We're now in the trampoline code, switch page tables
+ mcrr p15, 4, r2, r3, c2
+ isb
+
+ @ Invalidate the old TLBs
+ mcr p15, 4, r0, c8, c7, 0 @ TLBIALLH
+ dsb
eret
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 2f12e4056408..965706578f13 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -32,8 +32,15 @@
extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
+static pgd_t *boot_hyp_pgd;
+static pgd_t *hyp_pgd;
static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
+static void *init_bounce_page;
+static unsigned long hyp_idmap_start;
+static unsigned long hyp_idmap_end;
+static phys_addr_t hyp_idmap_vector;
+
static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
{
kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
@@ -71,172 +78,224 @@ static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
return p;
}
-static void free_ptes(pmd_t *pmd, unsigned long addr)
+static void clear_pud_entry(pud_t *pud)
{
- pte_t *pte;
- unsigned int i;
+ pmd_t *pmd_table = pmd_offset(pud, 0);
+ pud_clear(pud);
+ pmd_free(NULL, pmd_table);
+ put_page(virt_to_page(pud));
+}
- for (i = 0; i < PTRS_PER_PMD; i++, addr += PMD_SIZE) {
- if (!pmd_none(*pmd) && pmd_table(*pmd)) {
- pte = pte_offset_kernel(pmd, addr);
- pte_free_kernel(NULL, pte);
- }
- pmd++;
+static void clear_pmd_entry(pmd_t *pmd)
+{
+ pte_t *pte_table = pte_offset_kernel(pmd, 0);
+ pmd_clear(pmd);
+ pte_free_kernel(NULL, pte_table);
+ put_page(virt_to_page(pmd));
+}
+
+static bool pmd_empty(pmd_t *pmd)
+{
+ struct page *pmd_page = virt_to_page(pmd);
+ return page_count(pmd_page) == 1;
+}
+
+static void clear_pte_entry(pte_t *pte)
+{
+ if (pte_present(*pte)) {
+ kvm_set_pte(pte, __pte(0));
+ put_page(virt_to_page(pte));
}
}
-static void free_hyp_pgd_entry(unsigned long addr)
+static bool pte_empty(pte_t *pte)
+{
+ struct page *pte_page = virt_to_page(pte);
+ return page_count(pte_page) == 1;
+}
+
+static void unmap_range(pgd_t *pgdp, unsigned long long start, u64 size)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
- unsigned long hyp_addr = KERN_TO_HYP(addr);
+ pte_t *pte;
+ unsigned long long addr = start, end = start + size;
+ u64 range;
+
+ while (addr < end) {
+ pgd = pgdp + pgd_index(addr);
+ pud = pud_offset(pgd, addr);
+ if (pud_none(*pud)) {
+ addr += PUD_SIZE;
+ continue;
+ }
- pgd = hyp_pgd + pgd_index(hyp_addr);
- pud = pud_offset(pgd, hyp_addr);
+ pmd = pmd_offset(pud, addr);
+ if (pmd_none(*pmd)) {
+ addr += PMD_SIZE;
+ continue;
+ }
- if (pud_none(*pud))
- return;
- BUG_ON(pud_bad(*pud));
+ pte = pte_offset_kernel(pmd, addr);
+ clear_pte_entry(pte);
+ range = PAGE_SIZE;
- pmd = pmd_offset(pud, hyp_addr);
- free_ptes(pmd, addr);
- pmd_free(NULL, pmd);
- pud_clear(pud);
+ /* If we emptied the pte, walk back up the ladder */
+ if (pte_empty(pte)) {
+ clear_pmd_entry(pmd);
+ range = PMD_SIZE;
+ if (pmd_empty(pmd)) {
+ clear_pud_entry(pud);
+ range = PUD_SIZE;
+ }
+ }
+
+ addr += range;
+ }
}
/**
- * free_hyp_pmds - free a Hyp-mode level-2 tables and child level-3 tables
+ * free_boot_hyp_pgd - free HYP boot page tables
*
- * Assumes this is a page table used strictly in Hyp-mode and therefore contains
- * either mappings in the kernel memory area (above PAGE_OFFSET), or
- * device mappings in the vmalloc range (from VMALLOC_START to VMALLOC_END).
+ * Free the HYP boot page tables. The bounce page is also freed.
*/
-void free_hyp_pmds(void)
+void free_boot_hyp_pgd(void)
{
- unsigned long addr;
-
mutex_lock(&kvm_hyp_pgd_mutex);
- for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE)
- free_hyp_pgd_entry(addr);
- for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
- free_hyp_pgd_entry(addr);
+
+ if (boot_hyp_pgd) {
+ unmap_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
+ unmap_range(boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
+ kfree(boot_hyp_pgd);
+ boot_hyp_pgd = NULL;
+ }
+
+ if (hyp_pgd)
+ unmap_range(hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
+
+ kfree(init_bounce_page);
+ init_bounce_page = NULL;
+
mutex_unlock(&kvm_hyp_pgd_mutex);
}
-static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start,
- unsigned long end)
+/**
+ * free_hyp_pgds - free Hyp-mode page tables
+ *
+ * Assumes hyp_pgd is a page table used strictly in Hyp-mode and
+ * therefore contains either mappings in the kernel memory area (above
+ * PAGE_OFFSET), or device mappings in the vmalloc range (from
+ * VMALLOC_START to VMALLOC_END).
+ *
+ * boot_hyp_pgd should only map two pages for the init code.
+ */
+void free_hyp_pgds(void)
{
- pte_t *pte;
unsigned long addr;
- struct page *page;
- for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) {
- unsigned long hyp_addr = KERN_TO_HYP(addr);
+ free_boot_hyp_pgd();
+
+ mutex_lock(&kvm_hyp_pgd_mutex);
- pte = pte_offset_kernel(pmd, hyp_addr);
- BUG_ON(!virt_addr_valid(addr));
- page = virt_to_page(addr);
- kvm_set_pte(pte, mk_pte(page, PAGE_HYP));
+ if (hyp_pgd) {
+ for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE)
+ unmap_range(hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
+ for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
+ unmap_range(hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
+ kfree(hyp_pgd);
+ hyp_pgd = NULL;
}
+
+ mutex_unlock(&kvm_hyp_pgd_mutex);
}
-static void create_hyp_io_pte_mappings(pmd_t *pmd, unsigned long start,
- unsigned long end,
- unsigned long *pfn_base)
+static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start,
+ unsigned long end, unsigned long pfn,
+ pgprot_t prot)
{
pte_t *pte;
unsigned long addr;
- for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) {
- unsigned long hyp_addr = KERN_TO_HYP(addr);
-
- pte = pte_offset_kernel(pmd, hyp_addr);
- BUG_ON(pfn_valid(*pfn_base));
- kvm_set_pte(pte, pfn_pte(*pfn_base, PAGE_HYP_DEVICE));
- (*pfn_base)++;
- }
+ addr = start;
+ do {
+ pte = pte_offset_kernel(pmd, addr);
+ kvm_set_pte(pte, pfn_pte(pfn, prot));
+ get_page(virt_to_page(pte));
+ kvm_flush_dcache_to_poc(pte, sizeof(*pte));
+ pfn++;
+ } while (addr += PAGE_SIZE, addr != end);
}
static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start,
- unsigned long end, unsigned long *pfn_base)
+ unsigned long end, unsigned long pfn,
+ pgprot_t prot)
{
pmd_t *pmd;
pte_t *pte;
unsigned long addr, next;
- for (addr = start; addr < end; addr = next) {
- unsigned long hyp_addr = KERN_TO_HYP(addr);
- pmd = pmd_offset(pud, hyp_addr);
+ addr = start;
+ do {
+ pmd = pmd_offset(pud, addr);
BUG_ON(pmd_sect(*pmd));
if (pmd_none(*pmd)) {
- pte = pte_alloc_one_kernel(NULL, hyp_addr);
+ pte = pte_alloc_one_kernel(NULL, addr);
if (!pte) {
kvm_err("Cannot allocate Hyp pte\n");
return -ENOMEM;
}
pmd_populate_kernel(NULL, pmd, pte);
+ get_page(virt_to_page(pmd));
+ kvm_flush_dcache_to_poc(pmd, sizeof(*pmd));
}
next = pmd_addr_end(addr, end);
- /*
- * If pfn_base is NULL, we map kernel pages into HYP with the
- * virtual address. Otherwise, this is considered an I/O
- * mapping and we map the physical region starting at
- * *pfn_base to [start, end[.
- */
- if (!pfn_base)
- create_hyp_pte_mappings(pmd, addr, next);
- else
- create_hyp_io_pte_mappings(pmd, addr, next, pfn_base);
- }
+ create_hyp_pte_mappings(pmd, addr, next, pfn, prot);
+ pfn += (next - addr) >> PAGE_SHIFT;
+ } while (addr = next, addr != end);
return 0;
}
-static int __create_hyp_mappings(void *from, void *to, unsigned long *pfn_base)
+static int __create_hyp_mappings(pgd_t *pgdp,
+ unsigned long start, unsigned long end,
+ unsigned long pfn, pgprot_t prot)
{
- unsigned long start = (unsigned long)from;
- unsigned long end = (unsigned long)to;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
unsigned long addr, next;
int err = 0;
- if (start >= end)
- return -EINVAL;
- /* Check for a valid kernel memory mapping */
- if (!pfn_base && (!virt_addr_valid(from) || !virt_addr_valid(to - 1)))
- return -EINVAL;
- /* Check for a valid kernel IO mapping */
- if (pfn_base && (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1)))
- return -EINVAL;
-
mutex_lock(&kvm_hyp_pgd_mutex);
- for (addr = start; addr < end; addr = next) {
- unsigned long hyp_addr = KERN_TO_HYP(addr);
- pgd = hyp_pgd + pgd_index(hyp_addr);
- pud = pud_offset(pgd, hyp_addr);
+ addr = start & PAGE_MASK;
+ end = PAGE_ALIGN(end);
+ do {
+ pgd = pgdp + pgd_index(addr);
+ pud = pud_offset(pgd, addr);
if (pud_none_or_clear_bad(pud)) {
- pmd = pmd_alloc_one(NULL, hyp_addr);
+ pmd = pmd_alloc_one(NULL, addr);
if (!pmd) {
kvm_err("Cannot allocate Hyp pmd\n");
err = -ENOMEM;
goto out;
}
pud_populate(NULL, pud, pmd);
+ get_page(virt_to_page(pud));
+ kvm_flush_dcache_to_poc(pud, sizeof(*pud));
}
next = pgd_addr_end(addr, end);
- err = create_hyp_pmd_mappings(pud, addr, next, pfn_base);
+ err = create_hyp_pmd_mappings(pud, addr, next, pfn, prot);
if (err)
goto out;
- }
+ pfn += (next - addr) >> PAGE_SHIFT;
+ } while (addr = next, addr != end);
out:
mutex_unlock(&kvm_hyp_pgd_mutex);
return err;
@@ -250,27 +309,41 @@ out:
* The same virtual address as the kernel virtual address is also used
* in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying
* physical pages.
- *
- * Note: Wrapping around zero in the "to" address is not supported.
*/
int create_hyp_mappings(void *from, void *to)
{
- return __create_hyp_mappings(from, to, NULL);
+ unsigned long phys_addr = virt_to_phys(from);
+ unsigned long start = KERN_TO_HYP((unsigned long)from);
+ unsigned long end = KERN_TO_HYP((unsigned long)to);
+
+ /* Check for a valid kernel memory mapping */
+ if (!virt_addr_valid(from) || !virt_addr_valid(to - 1))
+ return -EINVAL;
+
+ return __create_hyp_mappings(hyp_pgd, start, end,
+ __phys_to_pfn(phys_addr), PAGE_HYP);
}
/**
* create_hyp_io_mappings - duplicate a kernel IO mapping into Hyp mode
* @from: The kernel start VA of the range
* @to: The kernel end VA of the range (exclusive)
- * @addr: The physical start address which gets mapped
+ * @phys_addr: The physical start address which gets mapped
*
* The resulting HYP VA is the same as the kernel VA, modulo
* HYP_PAGE_OFFSET.
*/
-int create_hyp_io_mappings(void *from, void *to, phys_addr_t addr)
+int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
{
- unsigned long pfn = __phys_to_pfn(addr);
- return __create_hyp_mappings(from, to, &pfn);
+ unsigned long start = KERN_TO_HYP((unsigned long)from);
+ unsigned long end = KERN_TO_HYP((unsigned long)to);
+
+ /* Check for a valid kernel IO mapping */
+ if (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1))
+ return -EINVAL;
+
+ return __create_hyp_mappings(hyp_pgd, start, end,
+ __phys_to_pfn(phys_addr), PAGE_HYP_DEVICE);
}
/**
@@ -307,42 +380,6 @@ int kvm_alloc_stage2_pgd(struct kvm *kvm)
return 0;
}
-static void clear_pud_entry(pud_t *pud)
-{
- pmd_t *pmd_table = pmd_offset(pud, 0);
- pud_clear(pud);
- pmd_free(NULL, pmd_table);
- put_page(virt_to_page(pud));
-}
-
-static void clear_pmd_entry(pmd_t *pmd)
-{
- pte_t *pte_table = pte_offset_kernel(pmd, 0);
- pmd_clear(pmd);
- pte_free_kernel(NULL, pte_table);
- put_page(virt_to_page(pmd));
-}
-
-static bool pmd_empty(pmd_t *pmd)
-{
- struct page *pmd_page = virt_to_page(pmd);
- return page_count(pmd_page) == 1;
-}
-
-static void clear_pte_entry(pte_t *pte)
-{
- if (pte_present(*pte)) {
- kvm_set_pte(pte, __pte(0));
- put_page(virt_to_page(pte));
- }
-}
-
-static bool pte_empty(pte_t *pte)
-{
- struct page *pte_page = virt_to_page(pte);
- return page_count(pte_page) == 1;
-}
-
/**
* unmap_stage2_range -- Clear stage2 page table entries to unmap a range
* @kvm: The VM pointer
@@ -356,43 +393,7 @@ static bool pte_empty(pte_t *pte)
*/
static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size)
{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- phys_addr_t addr = start, end = start + size;
- u64 range;
-
- while (addr < end) {
- pgd = kvm->arch.pgd + pgd_index(addr);
- pud = pud_offset(pgd, addr);
- if (pud_none(*pud)) {
- addr += PUD_SIZE;
- continue;
- }
-
- pmd = pmd_offset(pud, addr);
- if (pmd_none(*pmd)) {
- addr += PMD_SIZE;
- continue;
- }
-
- pte = pte_offset_kernel(pmd, addr);
- clear_pte_entry(pte);
- range = PAGE_SIZE;
-
- /* If we emptied the pte, walk back up the ladder */
- if (pte_empty(pte)) {
- clear_pmd_entry(pmd);
- range = PMD_SIZE;
- if (pmd_empty(pmd)) {
- clear_pud_entry(pud);
- range = PUD_SIZE;
- }
- }
-
- addr += range;
- }
+ unmap_range(kvm->arch.pgd, start, size);
}
/**
@@ -728,47 +729,105 @@ void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu)
phys_addr_t kvm_mmu_get_httbr(void)
{
- VM_BUG_ON(!virt_addr_valid(hyp_pgd));
return virt_to_phys(hyp_pgd);
}
+phys_addr_t kvm_mmu_get_boot_httbr(void)
+{
+ return virt_to_phys(boot_hyp_pgd);
+}
+
+phys_addr_t kvm_get_idmap_vector(void)
+{
+ return hyp_idmap_vector;
+}
+
int kvm_mmu_init(void)
{
- if (!hyp_pgd) {
+ int err;
+
+ hyp_idmap_start = virt_to_phys(__hyp_idmap_text_start);
+ hyp_idmap_end = virt_to_phys(__hyp_idmap_text_end);
+ hyp_idmap_vector = virt_to_phys(__kvm_hyp_init);
+
+ if ((hyp_idmap_start ^ hyp_idmap_end) & PAGE_MASK) {
+ /*
+ * Our init code is crossing a page boundary. Allocate
+ * a bounce page, copy the code over and use that.
+ */
+ size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
+ phys_addr_t phys_base;
+
+ init_bounce_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!init_bounce_page) {
+ kvm_err("Couldn't allocate HYP init bounce page\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ memcpy(init_bounce_page, __hyp_idmap_text_start, len);
+ /*
+ * Warning: the code we just copied to the bounce page
+ * must be flushed to the point of coherency.
+ * Otherwise, the data may be sitting in L2, and HYP
+ * mode won't be able to observe it as it runs with
+ * caches off at that point.
+ */
+ kvm_flush_dcache_to_poc(init_bounce_page, len);
+
+ phys_base = virt_to_phys(init_bounce_page);
+ hyp_idmap_vector += phys_base - hyp_idmap_start;
+ hyp_idmap_start = phys_base;
+ hyp_idmap_end = phys_base + len;
+
+ kvm_info("Using HYP init bounce page @%lx\n",
+ (unsigned long)phys_base);
+ }
+
+ hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
+ boot_hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
+ if (!hyp_pgd || !boot_hyp_pgd) {
kvm_err("Hyp mode PGD not allocated\n");
- return -ENOMEM;
+ err = -ENOMEM;
+ goto out;
}
- return 0;
-}
+ /* Create the idmap in the boot page tables */
+ err = __create_hyp_mappings(boot_hyp_pgd,
+ hyp_idmap_start, hyp_idmap_end,
+ __phys_to_pfn(hyp_idmap_start),
+ PAGE_HYP);
-/**
- * kvm_clear_idmap - remove all idmaps from the hyp pgd
- *
- * Free the underlying pmds for all pgds in range and clear the pgds (but
- * don't free them) afterwards.
- */
-void kvm_clear_hyp_idmap(void)
-{
- unsigned long addr, end;
- unsigned long next;
- pgd_t *pgd = hyp_pgd;
- pud_t *pud;
- pmd_t *pmd;
+ if (err) {
+ kvm_err("Failed to idmap %lx-%lx\n",
+ hyp_idmap_start, hyp_idmap_end);
+ goto out;
+ }
- addr = virt_to_phys(__hyp_idmap_text_start);
- end = virt_to_phys(__hyp_idmap_text_end);
+ /* Map the very same page at the trampoline VA */
+ err = __create_hyp_mappings(boot_hyp_pgd,
+ TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE,
+ __phys_to_pfn(hyp_idmap_start),
+ PAGE_HYP);
+ if (err) {
+ kvm_err("Failed to map trampoline @%lx into boot HYP pgd\n",
+ TRAMPOLINE_VA);
+ goto out;
+ }
- pgd += pgd_index(addr);
- do {
- next = pgd_addr_end(addr, end);
- if (pgd_none_or_clear_bad(pgd))
- continue;
- pud = pud_offset(pgd, addr);
- pmd = pmd_offset(pud, addr);
+ /* Map the same page again into the runtime page tables */
+ err = __create_hyp_mappings(hyp_pgd,
+ TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE,
+ __phys_to_pfn(hyp_idmap_start),
+ PAGE_HYP);
+ if (err) {
+ kvm_err("Failed to map trampoline @%lx into runtime HYP pgd\n",
+ TRAMPOLINE_VA);
+ goto out;
+ }
- pud_clear(pud);
- kvm_clean_pmd_entry(pmd);
- pmd_free(NULL, (pmd_t *)((unsigned long)pmd & PAGE_MASK));
- } while (pgd++, addr = next, addr < end);
+ return 0;
+out:
+ free_hyp_pgds();
+ return err;
}
diff --git a/arch/arm/kvm/perf.c b/arch/arm/kvm/perf.c
new file mode 100644
index 000000000000..1a3849da0b4b
--- /dev/null
+++ b/arch/arm/kvm/perf.c
@@ -0,0 +1,68 @@
+/*
+ * Based on the x86 implementation.
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/perf_event.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_emulate.h>
+
+static int kvm_is_in_guest(void)
+{
+ return kvm_arm_get_running_vcpu() != NULL;
+}
+
+static int kvm_is_user_mode(void)
+{
+ struct kvm_vcpu *vcpu;
+
+ vcpu = kvm_arm_get_running_vcpu();
+
+ if (vcpu)
+ return !vcpu_mode_priv(vcpu);
+
+ return 0;
+}
+
+static unsigned long kvm_get_guest_ip(void)
+{
+ struct kvm_vcpu *vcpu;
+
+ vcpu = kvm_arm_get_running_vcpu();
+
+ if (vcpu)
+ return *vcpu_pc(vcpu);
+
+ return 0;
+}
+
+static struct perf_guest_info_callbacks kvm_guest_cbs = {
+ .is_in_guest = kvm_is_in_guest,
+ .is_user_mode = kvm_is_user_mode,
+ .get_guest_ip = kvm_get_guest_ip,
+};
+
+int kvm_perf_init(void)
+{
+ return perf_register_guest_info_callbacks(&kvm_guest_cbs);
+}
+
+int kvm_perf_teardown(void)
+{
+ return perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
+}
diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
index 5ee505c937d1..83cb3ac27095 100644
--- a/arch/arm/mm/idmap.c
+++ b/arch/arm/mm/idmap.c
@@ -8,7 +8,6 @@
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/system_info.h>
-#include <asm/virt.h>
pgd_t *idmap_pgd;
@@ -83,37 +82,10 @@ static void identity_mapping_add(pgd_t *pgd, const char *text_start,
} while (pgd++, addr = next, addr != end);
}
-#if defined(CONFIG_ARM_VIRT_EXT) && defined(CONFIG_ARM_LPAE)
-pgd_t *hyp_pgd;
-
-extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
-
-static int __init init_static_idmap_hyp(void)
-{
- hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
- if (!hyp_pgd)
- return -ENOMEM;
-
- pr_info("Setting up static HYP identity map for 0x%p - 0x%p\n",
- __hyp_idmap_text_start, __hyp_idmap_text_end);
- identity_mapping_add(hyp_pgd, __hyp_idmap_text_start,
- __hyp_idmap_text_end, PMD_SECT_AP1);
-
- return 0;
-}
-#else
-static int __init init_static_idmap_hyp(void)
-{
- return 0;
-}
-#endif
-
extern char __idmap_text_start[], __idmap_text_end[];
static int __init init_static_idmap(void)
{
- int ret;
-
idmap_pgd = pgd_alloc(&init_mm);
if (!idmap_pgd)
return -ENOMEM;
@@ -123,12 +95,10 @@ static int __init init_static_idmap(void)
identity_mapping_add(idmap_pgd, __idmap_text_start,
__idmap_text_end, 0);
- ret = init_static_idmap_hyp();
-
/* Flush L1 for the hardware to see this page table content */
flush_cache_louis();
- return ret;
+ return 0;
}
early_initcall(init_static_idmap);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-30 11:48:40 +0000