linux-kernel - Re: [PATCH 2/2] x86/CPU/AMD: Improve the erratum 1386 workaround

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Date: Thu, 21 Mar 2024 16:21:39 +0100
From: "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To: Borislav Petkov <bp@...en8.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Boris Ostrovsky <boris.ostrovsky@...cle.com>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH 2/2] x86/CPU/AMD: Improve the erratum 1386 workaround

On 21.03.2024 13:05, Borislav Petkov wrote:
> From: "Borislav Petkov (AMD)" <bp@...en8.de>
> 
> Disable XSAVES only on machines which haven't loaded the microcode
> revision containing the erratum fix.
> 
> This will come in handy when running archaic OSes as guests. OSes whose
> brilliant programmers thought that CPUID is overrated and one should not
> query it but use features directly, ala shoot first, ask questions
> later... but only if you're alive after the shooting.
> 
> Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: "Maciej S. Szmigiero" <maciej.szmigiero@...cle.com>
> ---

Tested-by: Maciej S. Szmigiero <maciej.szmigiero@...cle.com>

Thanks,
Maciej