Re: [PATCH v2] KVM: x86: Advertise AVX512 Bit Matrix Multiply (BMM) to userspace

[Nikunj A. Dadhania]

On 2/10/2026 11:05 AM, Nikunj A Dadhania wrote:
> Advertise AVX512 Bit Matrix Multiply (BMM) and Bit Reversal instructions to
> userspace via CPUID leaf 0x80000021_EAX[23]. This feature enables bit
> matrix multiply operations and bit reversal.
> 
> While at it, reorder PREFETCHI to match the bit position order in CPUID
> leaf 0x80000021_EAX for better organization.
> 
> Signed-off-by: Nikunj A Dadhania <nikunj@xxxxxxx>
> ---

A gentle reminder.

> 
> AMD64 Bit Matrix Multiply and Bit Reversal Instructions
> Publication #69192 Revision: 1.00
> Issue Date: January 2026
> 
> https://docs.amd.com/v/u/en-US/69192-PUB
> ---
>  arch/x86/include/asm/cpufeatures.h | 1 +
>  arch/x86/kvm/cpuid.c               | 3 ++-
>  2 files changed, 3 insertions(+), 1 deletion(-)