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KVM: Add SMEP support when setting CR4

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This patch adds SMEP handling when setting CR4.

Signed-off-by: Yang, Wei <wei.y.yang@intel.com>
Signed-off-by: Shan, Haitao <haitao.shan@intel.com>
Signed-off-by: Li, Xin <xin.li@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Yang, Wei Y 2011-06-03 11:13:42 +08:00 committed by Avi Kivity
parent 8d9c975fc5
commit c68b734fba
1 changed files with 13 additions and 2 deletions
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15
arch/x86/kvm/x86.c
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@ -580,6 +580,14 @@ static bool guest_cpuid_has_xsave(struct kvm_vcpu *vcpu)
return best && (best->ecx & bit(X86_FEATURE_XSAVE));
}
static bool guest_cpuid_has_smep(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;
best = kvm_find_cpuid_entry(vcpu, 7, 0);
return best && (best->ebx & bit(X86_FEATURE_SMEP));
}
static void update_cpuid(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;
@ -599,14 +607,17 @@ static void update_cpuid(struct kvm_vcpu *vcpu)
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;
unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE |
X86_CR4_PAE | X86_CR4_SMEP;
if (cr4 & CR4_RESERVED_BITS)
return 1;
if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE))
return 1;
if (!guest_cpuid_has_smep(vcpu) && (cr4 & X86_CR4_SMEP))
return 1;
if (is_long_mode(vcpu)) {
if (!(cr4 & X86_CR4_PAE))
return 1;