linux-kernel - Re: [PATCH v4 1/6] x86: KVM: Advertise CMPccXADD CPUID to user space

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Message-ID: <Y3ubcwLlEdkj0/zK@zn.tnic>
Date:   Mon, 21 Nov 2022 16:38:27 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Jiaxi Chen <jiaxi.chen@...ux.intel.com>
Cc:     Dave Hansen <dave.hansen@...el.com>, kvm@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, seanjc@...gle.com,
        pbonzini@...hat.com, ndesaulniers@...gle.com,
        alexandre.belloni@...tlin.com, peterz@...radead.org,
        jpoimboe@...nel.org, chang.seok.bae@...el.com,
        pawan.kumar.gupta@...ux.intel.com, babu.moger@....com,
        jmattson@...gle.com, sandipan.das@....com, tony.luck@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, fenghua.yu@...el.com,
        keescook@...omium.org, nathan@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/6] x86: KVM: Advertise CMPccXADD CPUID to user space

On Mon, Nov 21, 2022 at 10:46:21PM +0800, Jiaxi Chen wrote:
> Features which has been enabled in kernel usually should be added to
> /proc/cpuinfo.

No, pls read this first: Documentation/x86/cpuinfo.rst

If something's not clear, we will extend it so that it is.

/proc/cpuinfo - a user ABI - is not a dumping ground for CPUID bits.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette