linux-kernel - Re: [PATCH v2 1/1] x86/elf: Add a new .note section containing Xfeatures information to x86 core files

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Message-ID: <20240526090554.GAZlL7cpva88mMUbCK@fat_crate.local>
Date: Sun, 26 May 2024 11:05:54 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Balasubrmanian, Vignesh" <vigbalas@....com>
Cc: "Balasubrmanian, Vignesh" <Vignesh.Balasubrmanian@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-toolchains@...r.kernel.org" <linux-toolchains@...r.kernel.org>,
	"mpe@...erman.id.au" <mpe@...erman.id.au>,
	"npiggin@...il.com" <npiggin@...il.com>,
	"christophe.leroy@...roup.eu" <christophe.leroy@...roup.eu>,
	"aneesh.kumar@...nel.org" <aneesh.kumar@...nel.org>,
	"naveen.n.rao@...ux.ibm.com" <naveen.n.rao@...ux.ibm.com>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"George, Jini Susan" <JiniSusan.George@....com>,
	"matz@...e.de" <matz@...e.de>,
	"binutils@...rceware.org" <binutils@...rceware.org>,
	"jhb@...eBSD.org" <jhb@...ebsd.org>,
	"felix.willgerodt@...el.com" <felix.willgerodt@...el.com>
Subject: Re: [PATCH v2 1/1] x86/elf: Add a new .note section containing
 Xfeatures information to x86 core files

On Sun, May 26, 2024 at 10:24:41AM +0530, Balasubrmanian, Vignesh wrote:
> If we can add a new enum only when we extend, then as Thomas suggested can
> we use other kernel variables as in the first version of the patch until we
> extend for other/new features?

I assume by "other kernel variables" you mean CPUID?

If so, can you change the layout of your buffer once you export it to
userspace?

-- 
Regards/Gruss,
    Boris.

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