linux-kernel - RE: [RFC PATCH 02/56] x86/Kconfig: Add CONFIG_DYNAMIC

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Message-ID:
 <LV3PR12MB9265E6B500778AD03739545194F6A@LV3PR12MB9265.namprd12.prod.outlook.com>
Date: Fri, 17 Oct 2025 13:57:06 +0000
From: "Kaplan, David" <David.Kaplan@....com>
To: Josh Poimboeuf <jpoimboe@...nel.org>
CC: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.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>, Alexander Graf <graf@...zon.com>, Boris
 Ostrovsky <boris.ostrovsky@...cle.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH 02/56] x86/Kconfig: Add CONFIG_DYNAMIC_MITIGATIONS

[AMD Official Use Only - AMD Internal Distribution Only]

> -----Original Message-----
> From: Josh Poimboeuf <jpoimboe@...nel.org>
> Sent: Thursday, October 16, 2025 4:20 PM
> To: Kaplan, David <David.Kaplan@....com>
> Cc: Thomas Gleixner <tglx@...utronix.de>; Borislav Petkov <bp@...en8.de>; Peter
> Zijlstra <peterz@...radead.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>; Alexander Graf <graf@...zon.com>; Boris Ostrovsky
> <boris.ostrovsky@...cle.com>; linux-kernel@...r.kernel.org
> Subject: Re: [RFC PATCH 02/56] x86/Kconfig: Add
> CONFIG_DYNAMIC_MITIGATIONS
>
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
>
>
> On Mon, Oct 13, 2025 at 09:33:50AM -0500, David Kaplan wrote:
> > CONFIG_DYNAMIC_MITIGATIONS enables support for runtime re-patching of the
> > kernel when mitigation selections are changed.  It depends on
> > CONFIG_LIVEPATCH because it needs modules to preserve all their ELF
> > information for later re-patching.  It also depends on CONFIG_FREEZER
> > because re-patching must be done while all tasks are in the freezer to
> > avoid race conditions.
>
> The LIVEPATCH dependency seems a bit arbitrary, can we have an
> underlying CONFIG_MODULE_PRESERVE_ELF, which LIVEPATCH and
> DYNAMIC_MITIGATIONS both select?
>

Ah, that's a good idea.  I'll look into that.

Thanks
--David Kaplan