From: Sean Christopherson <seanjc@google.com>
To: Jim Mattson <jmattson@google.com>
Cc: x86@kernel.org, Thomas Gleixner <tglx@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Yosry Ahmed <yosry@kernel.org>,
Nikunj A Dadhania <nikunj@amd.com>,
"H . Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH] x86/cpufeatures: Make AVX512_BMM depend on AVX512F
Date: Mon, 20 Jul 2026 12:48:02 -0700 [thread overview]
Message-ID: <al57cigFjjvwi7nH@google.com> (raw)
In-Reply-To: <20260715224030.3772948-1-jmattson@google.com>
On Wed, Jul 15, 2026, 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@google.com>
> ---
Reviewed-by: Sean Christopherson <seanjc@google.com>
I assume this will go through the tip tree.
prev parent reply other threads:[~2026-07-20 19:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-15 22:40 [PATCH] x86/cpufeatures: Make AVX512_BMM depend on AVX512F Jim Mattson
2026-07-15 22:56 ` sashiko-bot
2026-07-16 8:08 ` Nikunj A. Dadhania
2026-07-20 19:48 ` Sean Christopherson [this message]
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