linux-kernel - RE: [PATCH v3 05/35] x86/bugs: Restructure taa mitigation

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Message-ID:
 <LV3PR12MB926537C7108632E3C5236D1294F22@LV3PR12MB9265.namprd12.prod.outlook.com>
Date: Mon, 10 Feb 2025 17:19:18 +0000
From: "Kaplan, David" <David.Kaplan@....com>
To: Brendan Jackman <jackmanb@...gle.com>
CC: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Ingo Molnar
	<mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
	"x86@...nel.org" <x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 05/35] x86/bugs: Restructure taa mitigation

[AMD Official Use Only - AMD Internal Distribution Only]

> -----Original Message-----
> From: Brendan Jackman <jackmanb@...gle.com>
> Sent: Monday, February 10, 2025 10:25 AM
> To: Kaplan, David <David.Kaplan@....com>
> Cc: Thomas Gleixner <tglx@...utronix.de>; Borislav Petkov <bp@...en8.de>; Peter
> Zijlstra <peterz@...radead.org>; Josh Poimboeuf <jpoimboe@...nel.org>; Pawan
> Gupta <pawan.kumar.gupta@...ux.intel.com>; Ingo Molnar <mingo@...hat.com>;
> Dave Hansen <dave.hansen@...ux.intel.com>; x86@...nel.org; H . Peter Anvin
> <hpa@...or.com>; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v3 05/35] x86/bugs: Restructure taa mitigation
>
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
>
>
> On Wed, 8 Jan 2025 at 21:27, David Kaplan <david.kaplan@....com> wrote:
> > @@ -400,48 +402,71 @@ static void __init taa_select_mitigation(void)
> >                 return;
> >         }
> >
> > -       if (cpu_mitigations_off()) {
> > +       if (cpu_mitigations_off())
> >                 taa_mitigation = TAA_MITIGATION_OFF;
> > -               return;
> > -       }
> >
> >         /*
> >          * TAA mitigation via VERW is turned off if both
> >          * tsx_async_abort=off and mds=off are specified.
> > +        *
> > +        * MDS mitigation will be checked in taa_update_mitigation().
>
> What we are actually talking about here is the new verw_mitigation_enabled(), right?
> I don't think this block/commentary adds any clarity any more. Maybe just delete it?

Yeah, I think that's fair.

Thanks --David Kaplan