linux-kernel - Re: [PATCH v8 04/12] x86/spectre: Add boot time option to select Spectre v2 mitigation

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Message-ID: <nycvar.YFH.7.76.1801240022450.11852@cbobk.fhfr.pm>
Date:   Wed, 24 Jan 2018 00:24:36 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Andi Kleen <ak@...ux.intel.com>
cc:     Borislav Petkov <bp@...en8.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        gnomes@...rguk.ukuu.org.uk, x86@...nel.org,
        thomas.lendacky@....com, Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v8 04/12] x86/spectre: Add boot time option to select
 Spectre v2 mitigation

On Tue, 23 Jan 2018, Andi Kleen wrote:

> > Distros have always been in the situation "we let the external modules to 
> > load, as it'll work when it comes to functionality, but then it's our 
> > duty/responsibility to explain to 3rd parties that they *really* should 
> > recompile". Mostly because of security fixes to static inlines, but not 
> > only that.
> 
> You can use my previous patch which merely warns:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git/log/?h=spec/retpoline-module-2

Thanks for pointing this out, Andi. I've been just now writing more or 
less the same thing; ditching that and will reuse your patch instead.

Why was the more aggresive version (6cfb521ac0d5b) merged into Linus' tree 
instead of that?

Thanks,

-- 
Jiri Kosina
SUSE Labs