linux-kernel - Re: [PATCH 19/27] x86/fpu: Update xstate's PKRU value on write

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Message-ID: <20190408200331.wvvt4izcasmotkp6@linutronix.de>
Date:   Mon, 8 Apr 2019 22:03:31 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     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>,
        Rik van Riel <riel@...riel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH 19/27] x86/fpu: Update xstate's PKRU value on write_pkru()

On 2019-04-08 11:14:28 [-0700], Dave Hansen wrote:
> On 4/3/19 9:41 AM, Sebastian Andrzej Siewior wrote:
> > During the context switch the xstate is loaded which also includes the
> > PKRU value.
> > If xstate is restored on return to userland it is required that the
> > PKRU value in xstate is the same as the one in the CPU.
> 
> All of the protection keys bits in here look ok to me.  Thanks for the
> sustained work to get all those into shape.  I know it's a special
> snowflake.

> Although I paid much closer attention to the PK bits, feel free to add:
> 
> Reviewed-by: Dave Hansen <dave.hansen@...el.com>
> 
> for the series.

Thank you.

Sebastian