Commit 0a629563 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
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KVM: x86: Inject #GP if guest attempts to set unsupported EFER bits 



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

Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 11988499

arch/x86/kvm/x86.c

+7 −0
Original line number Diff line number Diff line
@@ -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;



}