KVM: x86/cpuid: Clear XFD for component i if the base feature is missing

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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: 690a757d61 ("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>

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Like Xu 2022-01-17 15:45:31 +08:00 • committed by Paolo Bonzini

parent 6ff94f27fd

commit e973746882

1 changed files with 3 additions and 0 deletions

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arch/x86/kvm/cpuid.c

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