Re: x86: AMD Zen2 ymm registers rolling back

[Alexander Monakov]

On Tue, 28 Feb 2023, Andrew Cooper wrote:

> On 28/02/2023 7:29 pm, Alexander Monakov wrote:
> > On Tue, 28 Feb 2023, Borislav Petkov wrote:
> >
> > 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.
> 
> I shouldn't be recommending this, but I've begged AMD many times to be
> better at publishing microcode...
> 
> https://github.com/platomav/CPUMicrocodes
> 
> and you'll need
[snip script]

Thank you, this is good to have. Unfortunately, even with microcode 0x08600109
taken from that repo the issue is reproducible (it is dated 2022-03-28, so
perhaps not really surprising).

Alexander