[PATCH 5/5] KVM: svm: Set X86_FEATURE_NO_LMSLE when !nested

[Jim Mattson]

KVM has never allowed a guest to set EFER.LMSLE when the "nested"
module parameter was false. In the past, there was no way for a guest
to know whether or not this was a legal EFER bit. Now, we can let the
guest know this bit is illegal by reporting X86_FEATURE_NO_LMSLE in
KVM_GET_SUPPORTED_CPUID.

Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
---
 arch/x86/kvm/svm/svm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 7c4fd594166c..942602d503ad 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4945,6 +4945,8 @@ static __init void svm_set_cpu_caps(void)
 	if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) ||
 	    boot_cpu_has(X86_FEATURE_AMD_SSBD))
 		kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);
+	if (!nested)
+		kvm_cpu_cap_set(X86_FEATURE_NO_LMSLE);
 
 	/* AMD PMU PERFCTR_CORE CPUID */
 	if (enable_pmu && boot_cpu_has(X86_FEATURE_PERFCTR_CORE))
-- 
2.37.3.968.ga6b4b080e4-goog