linux-kernel - [PATCH 3/5] KVM: x86: Report host's X86_FEATURE_NO_LMSLE in KVM_GET_SUPPORTED

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Date:   Thu, 15 Sep 2022 21:58:30 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Avi Kivity <avi@...hat.com>, Babu Moger <babu.moger@....com>,
        Borislav Petkov <bp@...en8.de>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Joerg Roedel <joerg.roedel@....com>,
        Josh Poimboeuf <jpoimboe@...nel.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wyes Karny <wyes.karny@....com>, x86@...nel.org
Cc:     Jim Mattson <jmattson@...gle.com>
Subject: [PATCH 3/5] KVM: x86: Report host's X86_FEATURE_NO_LMSLE in KVM_GET_SUPPORTED_CPUID

EFER.LMSLE is not supported in a KVM guest if it is not supported on
the underlying hardware. Inform the guest by exposing the host's value
of X86_FEATURE_NO_LMSLE in KVM_GET_SUPPORTED_CPUID.

Signed-off-by: Jim Mattson <jmattson@...gle.com>
---
 arch/x86/kvm/cpuid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 75dcf7a72605..b4975467d686 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -670,7 +670,7 @@ void kvm_set_cpu_caps(void)
 		kvm_cpu_cap_set(X86_FEATURE_GBPAGES);
 
 	kvm_cpu_cap_mask(CPUID_8000_0008_EBX,
-		F(CLZERO) | F(XSAVEERPTR) |
+		F(CLZERO) | F(XSAVEERPTR) | F(NO_LMSLE) |
 		F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) |
 		F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON) |
 		__feature_bit(KVM_X86_FEATURE_PSFD)
-- 
2.37.3.968.ga6b4b080e4-goog