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

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Message-ID: <mor3gytqfo236eiwrdmpghwn5lfobc4ebseea54zsewrtyj45s@7b5xnm3vdult>
Date: Thu, 16 Oct 2025 14:20:15 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: David Kaplan <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

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?

-- 
Josh