linux-kernel - Re: [RFC PATCH v2] tools/x86: add kcpuid tool to show raw CPU features

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Message-ID: <20200925201707.GQ16872@zn.tnic>
Date:   Fri, 25 Sep 2020 22:17:07 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     Feng Tang <feng.tang@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Yazen Ghannam <yazen.ghannam@....com>,
        Wei Huang <wei.huang2@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2] tools/x86: add kcpuid tool to show raw CPU
 features

On Fri, Sep 25, 2020 at 03:48:04PM -0400, Arvind Sankar wrote:
> Ok. Another suggestion: while designing the format for the cpuid.txt
> file, would it be possible to include enough information for
> cpufeatures.h to be auto-generated from it?

I think you're missing the previous discussion on this topic. In short:
/proc/cpuinfo is not CPUID but what the kernel supports. The kcpuid tool
is supposed to dump CPUID leafs and it should be updatable the easiest
way possible.

Here's some more documentation which should make this more clear:

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=ea4e3bef4c94d5b5d8e790f37b48b7641172bcf5

-- 
Regards/Gruss,
    Boris.

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