linux-kernel - Re: [patch 00/41] x86/fpu: Spring cleaning and PKRU sanitizing

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Message-ID: <8735thgecn.ffs@nanos.tec.linutronix.de>
Date:   Thu, 17 Jun 2021 09:06:00 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dave Hansen <dave.hansen@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [patch 00/41] x86/fpu: Spring cleaning and PKRU sanitizing

On Wed, Jun 16 2021 at 13:55, Dave Hansen wrote:
> On 6/11/21 5:24 PM, Thomas Gleixner wrote:
>> Making the kernel to pretend that all of this is consistent under all
>> circumstances is a futile attempt to ignore reality.
>> 
>> This inconsistency can only be fixed in hardware/ucode. End of story.
>
> I agree with this.  If it's going to be fixed, the kernel simply doesn't
> have the tools to do it.  We either need new ISA or new hardware/ucode.
>
> I'm just not convinced it's worth fixing for PKRU.

Me neither.