diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-10-28 13:26:38 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-03-21 09:28:40 -0400 |
| commit | 58b3d12c0a860cda34ed9d2378078ea5134e6812 (patch) | |
| tree | 6fd1c6194a2da0f1b04ffbdf4837d16a9ed8736a /arch/x86/kvm/cpuid.c | |
| parent | bf07be36cd881b50684aca8f76d4b407da6cb058 (diff) | |
| download | linux-58b3d12c0a860cda34ed9d2378078ea5134e6812.tar.bz2 | |
KVM: x86: add support for CPUID leaf 0x80000021
CPUID leaf 0x80000021 defines some features (or lack of bugs) of AMD
processors. Expose the ones that make sense via KVM_GET_SUPPORTED_CPUID.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index afcdd4e693e5..f0d5ac7a12c9 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -1068,7 +1068,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) entry->edx = 0; break; case 0x80000000: - entry->eax = min(entry->eax, 0x8000001f); + entry->eax = min(entry->eax, 0x80000021); break; case 0x80000001: cpuid_entry_override(entry, CPUID_8000_0001_EDX); @@ -1139,6 +1139,23 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) entry->ebx &= ~GENMASK(11, 6); } break; + case 0x80000020: + entry->eax = entry->ebx = entry->ecx = entry->edx = 0; + break; + case 0x80000021: + entry->ebx = entry->ecx = entry->edx = 0; + /* + * Pass down these bits: + * EAX 0 NNDBP, Processor ignores nested data breakpoints + * EAX 2 LAS, LFENCE always serializing + * EAX 6 NSCB, Null selector clear base + * + * Other defined bits are for MSRs that KVM does not expose: + * EAX 3 SPCL, SMM page configuration lock + * EAX 13 PCMSR, Prefetch control MSR + */ + entry->eax &= BIT(0) | BIT(2) | BIT(6); + break; /*Add support for Centaur's CPUID instruction*/ case 0xC0000000: /*Just support up to 0xC0000004 now*/ |