tree 04048690d06ce1c577d22010672507e59b901abe
parent 6ff94f27fd47847d6ecb9302f9d3bd1ca991a17f
author Like Xu <likexu@tencent.com> 1642405531 +0800
committer Paolo Bonzini <pbonzini@redhat.com> 1642612165 -0500

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>