linux-kernel - Re: x86: AMD Zen2 ymm registers rolling back

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Date:   Tue, 7 Mar 2023 08:45:19 -0800
From:   Tavis Ormandy <taviso@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Andrew Cooper <andrew.cooper3@...rix.com>,
        Alexander Monakov <amonakov@...ras.ru>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: x86: AMD Zen2 ymm registers rolling back

On Wed, Mar 01, 2023 at 09:54:14AM +0100, Borislav Petkov wrote:
> On Wed, Mar 01, 2023 at 12:23:01AM +0000, Andrew Cooper wrote:
> > So we need a table for all Zen2 parts of ucode revisions below which we
> > force hide XSAVES as the erratum workaround.
> 
> Working on it - stay tuned.
> 

FYI, I heard from someone offlist that they can reproduce with the
latest microcode available on this cpu:

cpu family  : 23
model       : 17
model name  : AMD Ryzen 3 2200G with Radeon Vega Graphics
stepping    : 0
microcode   : 0x8101016

It seems likely many zen1 systems are affected without any microcode
patch, which seems not great to me.

I guess it would be nice if AMD could provide a list of devices they're
not going to provide a patch for...

Tavis.

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