linux-kernel - Re: [PATCH v3 01/10] x86/bugs: Add a separate config for GDS

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Message-ID: <ZpUSvl5eKgkLeJrg@gmail.com>
Date: Mon, 15 Jul 2024 05:14:54 -0700
From: Breno Leitao <leitao@...ian.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>, mingo@...hat.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 01/10] x86/bugs: Add a separate config for GDS

Hello Borislav,

On Fri, Jul 12, 2024 at 07:21:32PM +0200, Borislav Petkov wrote:
> On Mon, Apr 22, 2024 at 09:58:15AM -0700, Breno Leitao wrote:
> > +config MITIGATION_GDS
> > +	bool "Mitigate Gather Data Sampling"
> > +	depends on CPU_SUP_INTEL
> > +	default y
> > +	help
> > +	  Enable mitigation for Gather Data Sampling (GDS). GDS is a hardware
> > +	  vulnerability which allows unprivileged speculative access to data
> > +	  which was previously stored in vector registers. The attacker uses gather
> > +	  instructions to infer the stale vector register data.
> > +
> >  config MITIGATION_GDS_FORCE
> 
> Btw, can we get rid of that thing, while at it?

Sure, I will send a v4 and get rid of GDS_FORCE_MITIGATION completely.

Thanks for the review.

--breno