linux-kernel - Re: [PATCH v9 12/26] x86/fpu/xstate: Use feature disable (XFD) to protect dynamic user state

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Message-ID: <YR4PqVytqEwFV7X9@zn.tnic>
Date:   Thu, 19 Aug 2021 10:00:41 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Bae, Chang Seok" <chang.seok.bae@...el.com>
Cc:     "Macieira, Thiago" <thiago.macieira@...el.com>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "Brown, Len" <len.brown@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Liu, Jing2" <jing2.liu@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 12/26] x86/fpu/xstate: Use feature disable (XFD) to
 protect dynamic user state

On Wed, Aug 18, 2021 at 09:37:58PM +0000, Bae, Chang Seok wrote:
> What if it never happens? It will be just the same as XGETBV(0). I
> think on the flip side there is also a benefit of maintaining a simple
> API as possible.

Dude, why are you still pointlessly harping on this?

How is adding adding another trivial prctl which will be simply
forwarding XCR0 for now, making the API more complex?

If you don't wanna do it just say so - someone else will.

Geez.

-- 
Regards/Gruss,
    Boris.

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