linux-kernel - Re: [tip: x86/fpu] x86/fpu: Deactivate FPU state after failure during state load

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Message-ID: <20200108114539.GE27363@zn.tnic>
Date:   Wed, 8 Jan 2020 12:45:39 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Andy Lutomirski <luto@...capital.net>,
        linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jann Horn <jannh@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tony Luck <tony.luck@...el.com>, x86-ml <x86@...nel.org>
Subject: Re: [tip: x86/fpu] x86/fpu: Deactivate FPU state after failure
 during state load

On Tue, Jan 07, 2020 at 10:11:34PM +0100, Sebastian Andrzej Siewior wrote:
> The go people contirbuted a testcase. Maybe I should hack up it up so
> that we trigger each path and post since it obviously did not happen.

Yes, please do.

> Boris, do you remember why we did not include their testcase yet?

It is in my ever-growing TODO list so if you could find some time to add
it to selftests, I'd appreciate it a lot:

https://lkml.kernel.org/r/20191126221328.GH31379@zn.tnic

And Andy wants it in the slow category (see reply) and that's fine with
me - I'm happy with some tests than none at all.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette