On 10/8/22 00:16, Jim Mattson wrote:
CPUID.80000021H:EAX[bit 9] indicates that the SMM_CTL MSR (0xc0010116) is not supported. This defeature can be advertised by KVM_GET_SUPPORTED_CPUID regardless of whether or not the host enumerates it. Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx> --- arch/x86/kvm/cpuid.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 2796dde06302..b748fac2ae37 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -1199,8 +1199,12 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) * Other defined bits are for MSRs that KVM does not expose: * EAX 3 SPCL, SMM page configuration lock * EAX 13 PCMSR, Prefetch control MSR + * + * KVM doesn't support SMM_CTL. + * EAX 9 SMM_CTL MSR is not supported */ entry->eax &= BIT(0) | BIT(2) | BIT(6); + entry->eax |= BIT(9); if (static_cpu_has(X86_FEATURE_LFENCE_RDTSC)) entry->eax |= BIT(2); if (!static_cpu_has_bug(X86_BUG_NULL_SEG))
Queued, thanks. Negative features suck, though. Paolo
