linux-kernel - Re: [PATCH] Update documentation to reflect what TAINT_CPU_OUT_OF

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Date:   Wed, 9 Dec 2020 00:11:36 +0100
From:   Mathieu Chouquet-Stringer <me@...hieu.digital>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Jonathan Corbet <corbet@....net>, Borislav Petkov <bp@...en8.de>,
        Stephen Kitt <steve@....org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        "Guilherme G. Piccoli" <gpiccoli@...onical.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Qais Yousef <qais.yousef@....com>,
        Naoki Hayama <naoki.hayama@...eo.co.jp>,
        Yue Hu <huyue2@...ong.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Update documentation to reflect what
 TAINT_CPU_OUT_OF_SPEC means nowadays

	Hello,

On Tue, Dec 08, 2020 at 09:58:32AM -0800, Randy Dunlap wrote:
> On 12/8/20 9:54 AM, Jonathan Corbet wrote:
> > On Wed,  2 Dec 2020 16:32:43 +0100
> > Mathieu Chouquet-Stringer <me@...hieu.digital> wrote:
> >> Signed-off-by: Mathieu Chouquet-Stringer <me@...hieu.digital>
> > 
> > Hearing no objection, I've applied this.

Thanks Jon.

> Hm, I was glad to read this new info since my old testing laptop
> now tells me that it needs a microcode update.  :(

In my case I first saw the error because tuned uses
x86_energy_perf_policy which uses to poke at MSRs [1]. And that was
tainting my kernel and I initially couldn't understand why.

It's been fixed but will be released in an upcoming kernel version (it's
in tip at the moment [2]).

Thanks to Borislav for work and for helping me out!

[1] https://lore.kernel.org/lkml/20201117210018.GA4247@weirdfishes/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=fe0a5788624c8b8f113a35bbe4636e37f9321241
-- 
Mathieu Chouquet-Stringer                             me@...hieu.digital
            The sun itself sees not till heaven clears.
	             -- William Shakespeare --