Re: [PATCH] x86/cpufeatures: Make AVX512_BMM depend on AVX512F

[Nikunj A. Dadhania]

On 7/16/2026 4:10 AM, Jim Mattson wrote:
> Add an explicit dependency between X86_FEATURE_AVX512_BMM and
> X86_FEATURE_AVX512F in the CPUID dependency table.
> 
> AVX512 Bit Matrix Multiply (BMM) instructions operate on vector registers
> and require AVX512 Foundation support. Declaring this dependency ensures
> that if AVX512F is disabled (e.g. via clearcpuid or host capabilities),
> AVX512_BMM will be automatically cleared as well.
> 
> Fixes: de0bfdc7137d ("KVM: x86: Advertise AVX512 Bit Matrix Multiply (BMM) to userspace")
> Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>

Reviewed-by: Nikunj A Dadhania <nikunj@xxxxxxx>