linux-kernel - Re: [PATCH 04/22] x86/fpu: Always init the `state' in fpu_

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Message-ID: <20190114193214.GR2773@zn.tnic>
Date:   Mon, 14 Jan 2019 20:32:14 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
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 04/22] x86/fpu: Always init the `state' in fpu__clear()

On Wed, Jan 09, 2019 at 12:47:26PM +0100, Sebastian Andrzej Siewior wrote:
> fpu__clear() only initializes the `state' if the FPU is present. This
> initialisation is also required for the FPU-less system and takes place

"in math_emulate()."

> math_emulate(). Since fpu__initialize() only performs the initialization
> if ->initialized is zero it does not matter that it is invoked each time
> an opcode is emulated. It makes the removal of ->initialized easier if
> the struct is also initialized in FPU-less case at the same time.

				in the

> 
> Move fpu__initialize() before the FPU check so it is also performed in
> FPU-less case.

in the...

> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  arch/x86/include/asm/fpu/internal.h | 1 -
>  arch/x86/kernel/fpu/core.c          | 5 ++---
>  arch/x86/math-emu/fpu_entry.c       | 3 ---
>  3 files changed, 2 insertions(+), 7 deletions(-)

With that fixed:

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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