linux-kernel - Re: [PATCH] x86/amd: Work around Erratum 1386

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Date:   Tue, 7 Mar 2023 21:09:11 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andrew Cooper <andrew.cooper3@...rix.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Tavis Ormandy <taviso@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Alexander Monakov <amonakov@...ras.ru>
Subject: Re: [PATCH] x86/amd: Work around Erratum 1386 - XSAVES malfunction
 on context switch

On Tue, Mar 07, 2023 at 08:01:36PM +0000, Andrew Cooper wrote:
> Sure, but why is that helpful?
> 
> XSAVES and XSAVEC are functionally identical on Zen1/2 because these
> CPUs don't advertise any supervisor XSAVE states.

I guess... We'll know soon enough.

> It is only Zen3 where XSAVES starts doing more than XSAVEC (and even
> then, only after the CET series actually gets merged...)

Yeah, latter should probably happen this time around. :-)

-- 
Regards/Gruss,
    Boris.

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