linux-kernel - Re: [PATCH 2/4] KVM: x86: Advertise AMX CPUIDs in subleaf 0x1E.0x1 to userspace

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Message-ID: <aXO4qPQlkqKeW6Sz@google.com>
Date: Fri, 23 Jan 2026 10:06:32 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Zhao Liu <zhao1.liu@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H . Peter Anvin" <hpa@...or.com>, Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Chao Gao <chao.gao@...el.com>, 
	Xudong Hao <xudong.hao@...el.com>
Subject: Re: [PATCH 2/4] KVM: x86: Advertise AMX CPUIDs in subleaf 0x1E.0x1 to userspace

On Thu, Nov 20, 2025, Zhao Liu wrote:
> Define and pass AMX CPUIDs (0x1E.0x1) through to userspace.

Similar to the PASSTHROUGH_F() thing in the first patch, these aren't strictly
being passed through.  In practice, they are passed through as of the current
code base due to the features residing in KVM-only words, but I'd like to avoid
stating that features are being passed through unless KVM very deliberately wants
to ignore the kernel.

As before, I'll tweak when applying.  Same goes for patches 3 and 4.