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

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Message-ID: <aXXLZ9nCzTmeaSS0@intel.com>
Date: Sun, 25 Jan 2026 15:51:03 +0800
From: Zhao Liu <zhao1.liu@...el.com>
To: Sean Christopherson <seanjc@...gle.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

> Unless someone feels *very* strongly about the "mirror" terminology, I'm going to
> use ALIAS instead of MIRROR when applying, to match KVM's existing terminology for
> the 8000_0001.EDX => 1.EDX aliases.
> 
> /*
>  * Intel-defined sub-features, CPUID level 0x0000001E:1 (EAX).  Note, several
>  * of the bits are aliases to features of the same name that are enumerated via
>  * various CPUID.0x7 sub-leafs.
>  */
> #define X86_FEATURE_AMX_INT8_ALIAS	KVM_X86_FEATURE(CPUID_1E_1_EAX, 0)
> #define X86_FEATURE_AMX_BF16_ALIAS	KVM_X86_FEATURE(CPUID_1E_1_EAX, 1)
> #define X86_FEATURE_AMX_COMPLEX_ALIAS	KVM_X86_FEATURE(CPUID_1E_1_EAX, 2)
> #define X86_FEATURE_AMX_FP16_ALIAS	KVM_X86_FEATURE(CPUID_1E_1_EAX, 3)

LGTM, yes, ALIAS sounds better than MIRROR.

Thanks,
Zhao