linux-kernel - Re: [PATCH 4.14 121/146] x86/fpu: Disable bottom halves while loading FPU registers

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Message-ID: <20181205190020.GO29510@zn.tnic>
Date:   Wed, 5 Dec 2018 20:00:20 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Jari Ruusu <jariruusu@...rs.sourceforge.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        kvm ML <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Kr?má? <rkrcmar@...hat.com>,
        Rik van Riel <riel@...riel.com>, x86-ml <x86@...nel.org>
Subject: Re: [PATCH 4.14 121/146] x86/fpu: Disable bottom halves while
 loading FPU registers

On Wed, Dec 05, 2018 at 06:26:24PM +0200, Jari Ruusu wrote:
> That same race appears to be present in older kernel branches also.
> The context is sligthly different, so the patch for 4.14 does not
> apply cleanly to older kernels. For 4.9 branch, this edit works:

You could take the upstream one, amend it with your change, test it and
send it to Greg - I believe he'll take the backport gladly.

:-)

-- 
Regards/Gruss,
    Boris.

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