[PATCH 4/5] KVM: x86: Enforce X86_FEATURE_NO_LMSLE in guest cpuid

[Jim Mattson]

When the guest CPUID reports that EFER.LMSLE is not supported, treat the
bit as reserved.

Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
---
 arch/x86/kvm/x86.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 43a6a7efc6ec..26c4ca73e389 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1686,6 +1686,9 @@ static bool __kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
 	if (efer & EFER_NX && !guest_cpuid_has(vcpu, X86_FEATURE_NX))
 		return false;
 
+	if (efer & EFER_LMSLE && guest_cpuid_has(vcpu, X86_FEATURE_NO_LMSLE))
+		return false;
+
 	return true;
 
 }
-- 
2.37.3.968.ga6b4b080e4-goog