linux-kernel - Re: [patch 26/60] x86/cpufeature: Make cpu bugs sticky

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Message-ID: <20171204223927.xpfjf3mg22cowham@pd.tnic>
Date:   Mon, 4 Dec 2017 23:39:27 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirsky <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Greg KH <gregkh@...uxfoundation.org>, keescook@...gle.com,
        hughd@...gle.com, Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com,
        Will Deacon <will.deacon@....com>, daniel.gruss@...k.tugraz.at
Subject: Re: [patch 26/60] x86/cpufeature: Make cpu bugs sticky

On Mon, Dec 04, 2017 at 03:07:32PM +0100, Thomas Gleixner wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> There is currently no way to force CPU bug bits like CPU feature bits. That
> makes it impossible to set a bug bit once at boot and have it stick for all
> upcoming CPUs.
> 
> Extend the force set/clear arrays to handle bug bits as well.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> 
> ---
>  arch/x86/include/asm/cpufeature.h |    2 ++
>  arch/x86/include/asm/processor.h  |    4 ++--
>  arch/x86/kernel/cpu/common.c      |    6 +++---
>  3 files changed, 7 insertions(+), 5 deletions(-)

This whole area needs more work... well, later...

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--