This patch exposes CPUID/CR4 to guest.
X86_FEATURE_PKU is referred to as "PKU" in the hardware documentation:
CPUID.7.0.ECX[3]:PKU. X86_FEATURE_OSPKE is software support for pkeys,
enumerated with CPUID.7.0.ECX[4]:OSPKE, and it reflects the setting of
CR4.PKE(bit 22).
Signed-off-by: Huaitong Han <huaitong....@intel.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index c12e845..3bbc1cb 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -55,7 +55,8 @@
| X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
| X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR |
X86_CR4_PCIDE \
| X86_CR4_OSXSAVE | X86_CR4_SMEP | X86_CR4_FSGSBASE \
- | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE | X86_CR4_SMAP))
+ | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE | X86_CR4_SMAP \
+ | X86_CR4_PKE))
#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 156441b..ece687b 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -81,6 +81,17 @@ int kvm_update_cpuid(struct kvm_vcpu *vcpu)
apic->lapic_timer.timer_mode_mask = 1 << 17;
}
+ best = kvm_find_cpuid_entry(vcpu, 7, 0);
+ if (!best)
+ return 0;
+
+ /*Update OSPKE bit */
+ if (boot_cpu_has(X86_FEATURE_PKU) && best->function == 0x7) {
+ best->ecx &= ~F(OSPKE);
+ if (kvm_read_cr4_bits(vcpu, X86_CR4_PKE))
+ best->ecx |= F(OSPKE);
+ }
+
best = kvm_find_cpuid_entry(vcpu, 0xD, 0);
if (!best) {
vcpu->arch.guest_supported_xcr0 = 0;
@@ -354,6 +365,9 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2
*entry, u32 function,
const u32 kvm_supported_word10_x86_features =
F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves;
+ /* cpuid 7.0.ecx*/
+ const u32 kvm_supported_word11_x86_features = F(PKU) | 0 /*OSPKE*/;
+
/* all calls to cpuid_count() should be made on the same cpu */
get_cpu();
@@ -431,10 +445,13 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2
*entry, u32 function,
cpuid_mask(&entry->ebx, 9);
// TSC_ADJUST is emulated
entry->ebx |= F(TSC_ADJUST);
- } else
+ entry->ecx &= kvm_supported_word11_x86_features;
+ cpuid_mask(&entry->ecx, 13);
+ } else {
entry->ebx = 0;
+ entry->ecx = 0;
+ }
entry->eax = 0;
- entry->ecx = 0;
entry->edx = 0;
break;
}
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index dd05b9c..7775158 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -70,6 +70,14 @@ static inline bool guest_cpuid_has_fsgsbase(struct kvm_vcpu
*vcpu)
return best && (best->ebx & bit(X86_FEATURE_FSGSBASE));
}
+static inline bool guest_cpuid_has_pku(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *best;
+
+ best = kvm_find_cpuid_entry(vcpu, 7, 0);
+ return best && (best->ecx & bit(X86_FEATURE_PKU));
+}
+
static inline bool guest_cpuid_has_longmode(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2d4e54d..5181834 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -709,7 +709,7 @@ int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
unsigned long old_cr4 = kvm_read_cr4(vcpu);
unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE |
- X86_CR4_SMEP | X86_CR4_SMAP;
+ X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE;
if (cr4 & CR4_RESERVED_BITS)
return 1;
@@ -726,6 +726,9 @@ int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
if (!guest_cpuid_has_fsgsbase(vcpu) && (cr4 & X86_CR4_FSGSBASE))
return 1;
+ if (!guest_cpuid_has_pku(vcpu) && (cr4 & X86_CR4_PKE))
+ return 1;
+
if (is_long_mode(vcpu)) {
if (!(cr4 & X86_CR4_PAE))
return 1;
@@ -751,7 +754,7 @@ int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
(!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)))
kvm_mmu_reset_context(vcpu);
- if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
+ if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE))
kvm_update_cpuid(vcpu);
return 0;
@@ -6838,7 +6841,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
- if (sregs->cr4 & X86_CR4_OSXSAVE)
+ if (sregs->cr4 & (X86_CR4_OSXSAVE | X86_CR4_PKE))
kvm_update_cpuid(vcpu);
idx = srcu_read_lock(&vcpu->kvm->srcu);
--
2.4.3
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