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Diffstat (limited to 'drivers/kvm')
-rw-r--r--drivers/kvm/kvm.h2
-rw-r--r--drivers/kvm/kvm_main.c23
-rw-r--r--drivers/kvm/vmx.c67
3 files changed, 71 insertions, 21 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index c252efe..db2bc6f 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -255,6 +255,7 @@ struct kvm_stat {
u32 request_irq_exits;
u32 irq_exits;
u32 light_exits;
+ u32 efer_reload;
};
struct kvm_vcpu {
@@ -289,6 +290,7 @@ struct kvm_vcpu {
u64 ia32_misc_enable_msr;
int nmsrs;
int save_nmsrs;
+ int msr_offset_efer;
#ifdef CONFIG_X86_64
int msr_offset_kernel_gs_base;
#endif
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 095d673..af07cd5 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -73,6 +73,7 @@ static struct kvm_stats_debugfs_item {
{ "request_irq", STAT_OFFSET(request_irq_exits) },
{ "irq_exits", STAT_OFFSET(irq_exits) },
{ "light_exits", STAT_OFFSET(light_exits) },
+ { "efer_reload", STAT_OFFSET(efer_reload) },
{ NULL }
};
@@ -2378,6 +2379,27 @@ out:
return r;
}
+static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
+{
+ u64 efer;
+ int i;
+ struct kvm_cpuid_entry *e, *entry;
+
+ rdmsrl(MSR_EFER, efer);
+ entry = NULL;
+ for (i = 0; i < vcpu->cpuid_nent; ++i) {
+ e = &vcpu->cpuid_entries[i];
+ if (e->function == 0x80000001) {
+ entry = e;
+ break;
+ }
+ }
+ if (entry && (entry->edx & EFER_NX) && !(efer & EFER_NX)) {
+ entry->edx &= ~(1 << 20);
+ printk(KERN_INFO ": guest NX capability removed\n");
+ }
+}
+
static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
struct kvm_cpuid *cpuid,
struct kvm_cpuid_entry __user *entries)
@@ -2392,6 +2414,7 @@ static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
cpuid->nent * sizeof(struct kvm_cpuid_entry)))
goto out;
vcpu->cpuid_nent = cpuid->nent;
+ cpuid_fix_nx_cap(vcpu);
return 0;
out:
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index dc99191..93e5bb2 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -42,6 +42,7 @@ static struct page *vmx_io_bitmap_b;
#else
#define HOST_IS_64 0
#endif
+#define EFER_SAVE_RESTORE_BITS ((u64)EFER_SCE)
static struct vmcs_descriptor {
int size;
@@ -85,6 +86,18 @@ static const u32 vmx_msr_index[] = {
};
#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
+static inline u64 msr_efer_save_restore_bits(struct vmx_msr_entry msr)
+{
+ return (u64)msr.data & EFER_SAVE_RESTORE_BITS;
+}
+
+static inline int msr_efer_need_save_restore(struct kvm_vcpu *vcpu)
+{
+ int efer_offset = vcpu->msr_offset_efer;
+ return msr_efer_save_restore_bits(vcpu->host_msrs[efer_offset]) !=
+ msr_efer_save_restore_bits(vcpu->guest_msrs[efer_offset]);
+}
+
static inline int is_page_fault(u32 intr_info)
{
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
@@ -265,6 +278,19 @@ static void reload_tss(void)
#endif
}
+static void load_transition_efer(struct kvm_vcpu *vcpu)
+{
+ u64 trans_efer;
+ int efer_offset = vcpu->msr_offset_efer;
+
+ trans_efer = vcpu->host_msrs[efer_offset].data;
+ trans_efer &= ~EFER_SAVE_RESTORE_BITS;
+ trans_efer |= msr_efer_save_restore_bits(
+ vcpu->guest_msrs[efer_offset]);
+ wrmsrl(MSR_EFER, trans_efer);
+ vcpu->stat.efer_reload++;
+}
+
static void vmx_save_host_state(struct kvm_vcpu *vcpu)
{
struct vmx_host_state *hs = &vcpu->vmx_host_state;
@@ -308,6 +334,8 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu)
}
#endif
load_msrs(vcpu->guest_msrs, vcpu->save_nmsrs);
+ if (msr_efer_need_save_restore(vcpu))
+ load_transition_efer(vcpu);
}
static void vmx_load_host_state(struct kvm_vcpu *vcpu)
@@ -336,6 +364,8 @@ static void vmx_load_host_state(struct kvm_vcpu *vcpu)
}
save_msrs(vcpu->guest_msrs, vcpu->save_nmsrs);
load_msrs(vcpu->host_msrs, vcpu->save_nmsrs);
+ if (msr_efer_need_save_restore(vcpu))
+ load_msrs(vcpu->host_msrs + vcpu->msr_offset_efer, 1);
}
/*
@@ -477,11 +507,13 @@ void move_msr_up(struct kvm_vcpu *vcpu, int from, int to)
*/
static void setup_msrs(struct kvm_vcpu *vcpu)
{
- int index, save_nmsrs;
+ int save_nmsrs;
save_nmsrs = 0;
#ifdef CONFIG_X86_64
if (is_long_mode(vcpu)) {
+ int index;
+
index = __find_msr_index(vcpu, MSR_SYSCALL_MASK);
if (index >= 0)
move_msr_up(vcpu, index, save_nmsrs++);
@@ -509,22 +541,7 @@ static void setup_msrs(struct kvm_vcpu *vcpu)
vcpu->msr_offset_kernel_gs_base =
__find_msr_index(vcpu, MSR_KERNEL_GS_BASE);
#endif
- index = __find_msr_index(vcpu, MSR_EFER);
- if (index >= 0)
- save_nmsrs = 1;
- else {
- save_nmsrs = 0;
- index = 0;
- }
- vmcs_writel(VM_ENTRY_MSR_LOAD_ADDR,
- virt_to_phys(vcpu->guest_msrs + index));
- vmcs_writel(VM_EXIT_MSR_STORE_ADDR,
- virt_to_phys(vcpu->guest_msrs + index));
- vmcs_writel(VM_EXIT_MSR_LOAD_ADDR,
- virt_to_phys(vcpu->host_msrs + index));
- vmcs_write32(VM_EXIT_MSR_STORE_COUNT, save_nmsrs);
- vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, save_nmsrs);
- vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, save_nmsrs);
+ vcpu->msr_offset_efer = __find_msr_index(vcpu, MSR_EFER);
}
/*
@@ -611,10 +628,15 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
{
struct vmx_msr_entry *msr;
+ int ret = 0;
+
switch (msr_index) {
#ifdef CONFIG_X86_64
case MSR_EFER:
- return kvm_set_msr_common(vcpu, msr_index, data);
+ ret = kvm_set_msr_common(vcpu, msr_index, data);
+ if (vcpu->vmx_host_state.loaded)
+ load_transition_efer(vcpu);
+ break;
case MSR_FS_BASE:
vmcs_writel(GUEST_FS_BASE, data);
break;
@@ -639,13 +661,13 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
if (msr) {
msr->data = data;
if (vcpu->vmx_host_state.loaded)
- load_msrs(vcpu->guest_msrs,vcpu->save_nmsrs);
+ load_msrs(vcpu->guest_msrs, vcpu->save_nmsrs);
break;
}
- return kvm_set_msr_common(vcpu, msr_index, data);
+ ret = kvm_set_msr_common(vcpu, msr_index, data);
}
- return 0;
+ return ret;
}
/*
@@ -1326,6 +1348,9 @@ static int vmx_vcpu_setup(struct kvm_vcpu *vcpu)
asm ("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
+ vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
+ vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
+ vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
generated by cgit v0.10.2 at 2024-07-30 00:20:34 (GMT)