From c68b734fba402b9bfdd49e23b776c42dbeaf1f5b Mon Sep 17 00:00:00 2001 From: "Yang, Wei Y" Date: Fri, 3 Jun 2011 11:13:42 +0800 Subject: [PATCH] KVM: Add SMEP support when setting CR4 This patch adds SMEP handling when setting CR4. Signed-off-by: Yang, Wei Signed-off-by: Shan, Haitao Signed-off-by: Li, Xin Signed-off-by: Avi Kivity --- arch/x86/kvm/x86.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 694538a..ba5cd27 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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; -- 2.7.4