KVM: SVM: Handle EferLmsleUnsupported

[PATCH v2 0/2] KVM: SVM: Handle EferLmsleUnsupported

Jim Mattson posted 2 patches 20 hours ago

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arch/x86/include/asm/cpufeatures.h | 1 +
arch/x86/kvm/cpuid.c               | 1 +
arch/x86/kvm/svm/svm.c             | 4 +++-
3 files changed, 5 insertions(+), 1 deletion(-)

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[PATCH v2 0/2] KVM: SVM: Handle EferLmsleUnsupported

Posted by Jim Mattson 20 hours ago

It is no longer the case that EFER.LMSLE is supported by all SVM-capable
processors. AMD enumerates the absence of this feature by CPUID
Fn8000_0008_EBX[EferLmlseUnsupported](bit 20)=1.

Advertise this defeature bit to userspace via KVM_GET_SUPPORTED_CPUID,
and don't allow a guest to set EFER.LMSLE on hardware that doesn't
support the feature.

Jim Mattson (2):
  KVM: x86: Advertise EferLmsleUnsupported to userspace
  KVM: SVM: Disallow EFER.LMSLE when not supported by hardware

 arch/x86/include/asm/cpufeatures.h | 1 +
 arch/x86/kvm/cpuid.c               | 1 +
 arch/x86/kvm/svm/svm.c             | 4 +++-
 3 files changed, 5 insertions(+), 1 deletion(-)

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2.51.0.618.g983fd99d29-goog