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

[Zhao Liu]

On Fri, Jan 23, 2026 at 10:06:32AM -0800, Sean Christopherson wrote:
> Date: Fri, 23 Jan 2026 10:06:32 -0800
> From: Sean Christopherson <seanjc@xxxxxxxxxx>
> 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.

Good point, thanks for your reminder!

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

Thanks!

-Zhao