44 lines
1.8 KiB
Diff
44 lines
1.8 KiB
Diff
From 35b7cde8ddf1c374c533ec0de2958d2cd74e587d Mon Sep 17 00:00:00 2001
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From: Jim Mattson <jmattson@google.com>
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Date: Fri, 7 Oct 2022 15:16:44 -0700
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Subject: [PATCH 29/36] KVM: x86: Advertise that the SMM_CTL MSR is not
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supported
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CPUID.80000021H:EAX[bit 9] indicates that the SMM_CTL MSR (0xc0010116) is
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not supported. This defeature can be advertised by KVM_GET_SUPPORTED_CPUID
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regardless of whether or not the host enumerates it; currently it will be
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included only if the host enumerates at least leaf 8000001DH, due to a
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preexisting bug in QEMU that KVM has to work around (commit f751d8eac176,
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"KVM: x86: work around QEMU issue with synthetic CPUID leaves", 2022-04-29).
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Signed-off-by: Jim Mattson <jmattson@google.com>
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Message-Id: <20221007221644.138355-1-jmattson@google.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 74bee0cad8dcd8ddec5e763c369239fc5990676a)
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Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
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Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
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---
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arch/x86/kvm/cpuid.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
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index 6e3f385a3648..3726861ae52a 100644
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--- a/arch/x86/kvm/cpuid.c
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+++ b/arch/x86/kvm/cpuid.c
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@@ -1180,8 +1180,12 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
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* Other defined bits are for MSRs that KVM does not expose:
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* EAX 3 SPCL, SMM page configuration lock
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* EAX 13 PCMSR, Prefetch control MSR
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+ *
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+ * KVM doesn't support SMM_CTL.
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+ * EAX 9 SMM_CTL MSR is not supported
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*/
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entry->eax &= BIT(0) | BIT(2) | BIT(6);
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+ entry->eax |= BIT(9);
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if (static_cpu_has(X86_FEATURE_LFENCE_RDTSC))
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entry->eax |= BIT(2);
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if (!static_cpu_has_bug(X86_BUG_NULL_SEG))
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--
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2.39.3
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