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KVM: x86: Inject #GP if guest attempts to set unsupported EFER bits

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EFER.LME and EFER.NX are considered reserved if their respective feature
bits are not advertised to the guest.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-04-02 08:19:16 -07:00 committed by Paolo Bonzini
parent 11988499e6
commit 0a62956312
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kvm/x86.c
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@ -1266,6 +1266,13 @@ static bool __kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
if (efer & EFER_SVME && !guest_cpuid_has(vcpu, X86_FEATURE_SVM))
return false;
if (efer & (EFER_LME | EFER_LMA) &&
!guest_cpuid_has(vcpu, X86_FEATURE_LM))
return false;
if (efer & EFER_NX && !guest_cpuid_has(vcpu, X86_FEATURE_NX))
return false;
return true;
}