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

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Message-ID: <0371ec3d-0899-f94a-7f21-21d805df2927@citrix.com>
Date:   Wed, 22 Feb 2023 09:38:09 +0000
From:   Andrew Cooper <andrew.cooper3@...rix.com>
To:     Borislav Petkov <bp@...en8.de>, Tavis Ormandy <taviso@...il.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: x86: AMD Zen2 ymm registers rolling back

On 22/02/2023 9:14 am, Borislav Petkov wrote:
> On Wed, Feb 22, 2023 at 09:33:19AM +0100, Borislav Petkov wrote:
>> It probably doesn't matter all too much but which kernel are you running
>> this on?
>>
>> Latest and greatest I hope...
> Also, what does
>
> $ grep microcode /proc/cpuinfo | uniq
>
> say?

This sounds suspiciously like an errata which was fixed with a ucode
update last year.

Check that you are up to date with ucode.  If you are, perhaps the fix
needs another look at...

~Andrew