linux-kernel - Re: [PATCH v2 1/2] x86/bugs: Don't fill RSB on VMEXIT with eIBRS+retpoline

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Message-ID: <20241221091311.GCZ2aGp1JeqKBL_PzL@fat_crate.local>
Date: Sat, 21 Dec 2024 10:13:11 +0100
From: Borislav Petkov <bp@...en8.de>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, amit@...nel.org, kvm@...r.kernel.org,
	amit.shah@....com, thomas.lendacky@....com, tglx@...utronix.de,
	peterz@...radead.org, corbet@....net, mingo@...hat.com,
	dave.hansen@...ux.intel.com, hpa@...or.com, seanjc@...gle.com,
	pbonzini@...hat.com, daniel.sneddon@...ux.intel.com,
	kai.huang@...el.com, sandipan.das@....com,
	boris.ostrovsky@...cle.com, Babu.Moger@....com,
	david.kaplan@....com, dwmw@...zon.co.uk, andrew.cooper3@...rix.com
Subject: Re: [PATCH v2 1/2] x86/bugs: Don't fill RSB on VMEXIT with
 eIBRS+retpoline

On Thu, Dec 05, 2024 at 03:12:07PM -0800, Josh Poimboeuf wrote:
> Ok, I'll try to write up a document.  I'm thinking it should go in its
> own return-based-attacks.rst file rather than spectre.rst, which is more
> of an outdated historical document at this point.

Thanks!

> And we want this document to actually be read (and kept up to date) by
> developers instead of mostly ignored like the others.

Good idea.

Now how do we enforce this?

We could add a rule to checkpatch or to some other patch checking script
like mine here for example :-)

https://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git/log/?h=vp

-- 
Regards/Gruss,
    Boris.

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