linux-kernel - RE: [PATCH v2 05/35] x86/bugs: Restructure taa mitigation

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Message-ID:
 <LV3PR12MB926557791369E71F0A2BE84F945B2@LV3PR12MB9265.namprd12.prod.outlook.com>
Date: Thu, 14 Nov 2024 15:08:05 +0000
From: "Kaplan, David" <David.Kaplan@....com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
CC: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
	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 v2 05/35] x86/bugs: Restructure taa mitigation

[AMD Official Use Only - AMD Internal Distribution Only]

> -----Original Message-----
> From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
> Sent: Wednesday, November 13, 2024 10:43 PM
> 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>; 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 v2 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 Tue, Nov 05, 2024 at 03:54:25PM -0600, David Kaplan wrote:
> > +static void __init taa_update_mitigation(void) {
> > +     if (!boot_cpu_has_bug(X86_BUG_TAA))
> > +             return;
> > +
> > +     if (mitigate_any_verw())
> > +             taa_mitigation = TAA_MITIGATION_VERW;
>
> This isn't right, TAA_MITIGATION_UCODE_NEEDED can never get set
> irrespective of microcode.
>
> The UCODE_NEEDED checks in taa_select_mitigation() actually belongs here.

Ah, I see your point.  I'll fix this, and for mmio/rfds too.

Thanks --David Kaplan