linux-kernel - Re: [PATCH v3 20/35] x86/bugs: Define attack vectors

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Message-ID: <20250226215147.233kxx2z7v7rnu5k@desk>
Date: Wed, 26 Feb 2025 13:51:47 -0800
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Borislav Petkov <bp@...en8.de>
Cc: "Kaplan, David" <David.Kaplan@....com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.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 v3 20/35] x86/bugs: Define attack vectors

On Wed, Feb 26, 2025 at 10:01:29PM +0100, Borislav Petkov wrote:
> On Wed, Feb 26, 2025 at 12:14:53PM -0800, Pawan Gupta wrote:
> > This is a bit ambiguous, mitigations=off,guest_host could be interpreted as
> > disabling guest->host and enabling all others. Using attack vectors with
> > both =on and =off seems unnecessary.
> 
> No, you'll have
> 
> mitigations=[global],[separate_vector(s)]
> 
> so global can be "on", "off", "auto" and the separate vector enables only that
> specific one.

I got that part, what I meant was allowing to use =off,<enabled vectors>
seems unnecessary when the same can be achieved by =on,<disabled vectors>.