linux-kernel - Re: [PATCH v3 2/2] x86/cpufeature: Add a debug print for unmet dependencies

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Message-ID: <2d9a60fb-1544-427f-9c73-d303bfe85773@intel.com>
Date: Mon, 9 Dec 2024 11:28:59 -0800
From: Sohil Mehta <sohil.mehta@...el.com>
To: "H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>, "Ahmed S . Darwish"
	<darwi@...utronix.de>
CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	"Uros Bizjak" <ubizjak@...il.com>, Sandipan Das <sandipan.das@....com>, "Sean
 Christopherson" <seanjc@...gle.com>, Peter Zijlstra <peterz@...radead.org>,
	Vegard Nossum <vegard.nossum@...cle.com>, Tony Luck <tony.luck@...el.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Nikolay Borisov
	<nik.borisov@...e.com>, Eric Biggers <ebiggers@...gle.com>, Xin Li
	<xin3.li@...el.com>, Alexander Shishkin <alexander.shishkin@...el.com>,
	Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
	<linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v3 2/2] x86/cpufeature: Add a debug print for unmet
 dependencies

On 12/7/2024 1:11 PM, H. Peter Anvin wrote:
> 
> Ok, I realize that the x86 maintainers **very legitimately** don't
> want more crap in /proc/cpuinfo, but perhaps we could include the
> strings for printing debug messages in cleartext? Add a bitmap for
> which entries should go into /proc/cpuinfo.
Could the cpuid-db project be helpful at some point in this regard? It
seems to have a name ("id") for each feature and a tracking of whether
each feature is exposed via cpuinfo and with what name.

> <bit20 len="1"  id="cet_ibt"                 desc="CET indirect branch tracking">
>   <linux        feature="true"               proc="true"            altid="ibt" />
> </bit20>


Though I am not sure if it only tracks the hardware originating features
represented in cpuid or the linux defined features as well?