Re: [PATCH] x86/CPU/AMD: Only apply Zenbleed fix for Zen2 during late microcode load

[Borislav Petkov]

On September 23, 2024 5:41:12 PM GMT+02:00, John Allen <john.allen@xxxxxxx> wrote:
>A problem was introduced with f69759b ("x86/CPU/AMD: Move Zenbleed check to

Use 12 chars for the commit id.

>the Zen2 init function") where a bit in the DE_CFG MSR is getting set after
>a microcode late load.
>
>The problem is that the microcode late load path calls into
>amd_check_microcode and subsequently zen2_zenbleed_check. Since the patch
>removes the cpu_has_amd_erratum check from zen2_zenbleed_check, this will

End all function names with "()".

>cause all non-Zen2 cpus to go through the function and set the bit in the
>DE_CFG MSR.
>
>Call into the zenbleed fix path on Zen2 cpus only.

s/cpus/CPUs/g

And yes, it should be cc:stable.

With all that addressed, you can add:

Acked-by: me

to the patch.

Thx.

-- 
Sent from a small device: formatting sucks and brevity is inevitable.