linux-kernel - Re: [RFC PATCH 04/56] x86/bugs: Reset spectre

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Message-ID: <20251103182453.GPaQjzdVCYTKRb7H5Y@fat_crate.local>
Date: Mon, 3 Nov 2025 19:24:53 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Kaplan, David" <David.Kaplan@....com>
Cc: Thomas Gleixner <tglx@...utronix.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>, 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 04/56] x86/bugs: Reset spectre_v1 mitigations

On Wed, Oct 29, 2025 at 01:48:03PM +0000, Kaplan, David wrote:
> We have cross-dependencies around the *selection* of mitigations, but not
> around the application of them.  There is no ordering requirement around the
> *_apply_mitigation() functions.  As such I would not expect (and have not
> observed) any ordering requirements around the reset functions.

This sounds like a single undo-function should be fine...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette