linux-kernel - Re: [RFC PATCH 04/10] x86/fpu: eager switch PKRU state

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Message-ID: <20180919165824.pedllijaci32gwd4@linutronix.de>
Date:   Wed, 19 Sep 2018 18:58:25 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Rik van Riel <riel@...riel.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, Andy Lutomirski <luto@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        kvm@...r.kernel.org, "Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [RFC PATCH 04/10] x86/fpu: eager switch PKRU state

On 2018-09-12 08:49:01 [-0700], Andy Lutomirski wrote:
> Sure, but the first write is *before* this. So we can be preempted with the two copies of PKRU being out of sync.

so it took a while to understand this but now that I did, I will
consider this in the next version. Thank you.

Sebastian