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

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Message-ID: <4d21fe93-7b77-bf5a-9ba8-645256ab0983@ispras.ru>
Date:   Tue, 28 Feb 2023 22:29:23 +0300 (MSK)
From:   Alexander Monakov <amonakov@...ras.ru>
To:     Borislav Petkov <bp@...en8.de>
cc:     Andrew Cooper <andrew.cooper3@...rix.com>,
        Tavis Ormandy <taviso@...il.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: Re: x86: AMD Zen2 ymm registers rolling back

On Tue, 28 Feb 2023, Borislav Petkov wrote:

> On Tue, Feb 28, 2023 at 10:24:40PM +0300, Alexander Monakov wrote:
> > No, on the contrary, if there were no updates I would not be able to
> > see microcode version increase after updating.
> 
> So what are you saying then?

That I can reproduce the bug even with the latest BIOS, i.e. the microcode
in the latest BIOS update does not have the fix, and the linux-firmware.git
microcode does not have a patch for this CPU family at all.

Hence the question how to get fixed microcode for this CPU family.

Alexander