Messages in this thread | | | Date | Wed, 22 Feb 2023 23:25:02 +0100 | From | Borislav Petkov <> | Subject | Re: x86: AMD Zen2 ymm registers rolling back |
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On Wed, Feb 22, 2023 at 01:26:37PM -0800, Tavis Ormandy wrote: > Thanks - confirmed, it *doesn't* repro with 0x8301055, but does repro > with 0x830104d.
Good.
> Annoyingly, I thought I was using the most recent microcode, but it seems > like there is some bug and debian wasn't applying it at boot.
Well, actually, microcode loading is so simple - you don't absolutely need to rely on the distros to do it for ya.
You simply get it from
git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
and copy all the bin files from amd-ucode/ into /lib/firmware/amd-ucode/
Technically, you'd need only the one for your family but the tools can deal with multiple files in there.
And then you're all set - dracut or whatever creates your initrd will add it. You can even add it by hand, see
Documentation/x86/microcode.rst
> That seems like a scary errata :-/
Yeah, modern x86 hardware is crazy complex. And we've had worse. :-\
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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