linux-kernel - Re: [RFC PATCH 07/56] x86/bugs: Reset spectre_v2

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Message-ID: <20251204150743.GFaTGjv6gadE7xZ6T8@fat_crate.local>
Date: Thu, 4 Dec 2025 16:07:43 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Kaplan, David" <David.Kaplan@....com>
Cc: Brendan Jackman <jackmanb@...gle.com>,
	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 07/56] x86/bugs: Reset spectre_v2_user mitigations

On Wed, Dec 03, 2025 at 08:14:08PM +0000, Kaplan, David wrote:
> Yeah, I think that's worth considering.  I think for the get functions (e.g.
> ib_prctl_get()) they can return whatever the current mitigation status is.
> But for the set functions (e.g. ib_prctl_set()) would stop returning EPERM
> due to system-wide mitigation settings.
> 
> In other words, maybe something like this?  (And similar for the other ones
> like ssb_prctl_seg)

Looks about right to me.

Thx.

-- 
Regards/Gruss,
    Boris.

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