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| author |  Like Xu <likexu@tencent.com>
| 2022-01-17 15:45:31 +0800 |
|---|---|---|
| committer |  Paolo Bonzini <pbonzini@redhat.com>
| 2022-01-19 12:09:25 -0500 |
| commit | e9737468829c2f6abc0c67e5372f8878dff11653 (patch) | |
| tree | 04048690d06ce1c577d22010672507e59b901abe /arch/x86/kvm/cpuid.c | |
| parent | KVM: x86/mmu: Improve TLB flush comment in kvm_mmu_slot_remove_write_access() (diff) | |
| download | linux-e9737468829c2f6abc0c67e5372f8878dff11653.tar.gz linux-e9737468829c2f6abc0c67e5372f8878dff11653.tar.bz2 linux-e9737468829c2f6abc0c67e5372f8878dff11653.zip | |
KVM: x86/cpuid: Clear XFD for component i if the base feature is missing
According to Intel extended feature disable (XFD) spec, the sub-function i
(i > 1) of CPUID function 0DH enumerates "details for state component i.
ECX[2] enumerates support for XFD support for this state component."
If KVM does not report F(XFD) feature (e.g. due to CONFIG_X86_64),
then the corresponding XFD support for any state component i
should also be removed. Translate this dependency into KVM terms.
Fixes: 690a757d610e ("kvm: x86: Add CPUID support for Intel AMX")
Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20220117074531.76925-1-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index a7c280d2113b..3902c28fb6cb 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -936,6 +936,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) --array->nent; continue; } + + if (!kvm_cpu_cap_has(X86_FEATURE_XFD)) + entry->ecx &= ~BIT_ULL(2); entry->edx = 0; } break; |