linux-kernel - Re: [patch 0/3] x86/fpu: Prevent FPU state corruption

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Date:   Wed, 18 May 2022 16:08:32 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Filipe Manana <fdmanana@...e.com>,
        Vadim Galitsin <vadim.galitsyn@...cle.com>
Subject: Re: [patch 0/3] x86/fpu: Prevent FPU state corruption

Hi Thomas,

On Wed, May 18, 2022 at 03:09:54PM +0200, Thomas Gleixner wrote:
> In the interest of users we should probably bite the bullet and just
> disable hard interrupt FPU usage upstream and Cc stable. The stable
> kernel updates probably reach users faster.

Considering <https://git.zx2c4.com/linux-rng/commit/?id=e3e33fc2e> is
slated for 5.19, that seems fine, as this will remove what is hopefully
the last hardirq FPU user.

The bigger motivation, though, for removing the hardirq FPU code would
be for just simplifying the FPU handling. The VirtualBox people are
going to have to fix this bug anyway, since it also affects old kernels
they support.

Jason