Re: Request to port to 6.6.y : c809b0d0e52d ("x86/microcode/AMD: Flush patch buffer mapping after application")

[Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>]

On Mon, Dec 23, 2024 at 01:33:17PM +0100, Greg KH wrote:
> Wait, why do you want these for the 6.6.y tree if you haven't even
> tested to see if they are required or work there?  Why not just move to
> 6.12.y instead as you know that works.

The original problem was reported by me on 6.6.y.
I tested the patch provided by Borislav on 6.6.y. As mentioned, a small change
is required to make it compile, but this is a nonfunctional change in the
tested code path and so didn't influence test results.
I can therefore say with certainty that the fix is required on 6.6.y .

In these discussions, I requested Borislav if the patch could also be submitted
for 6.6.y, and made him aware that variable 'bsp_cpuid_1_eax' used in the patch
does not yet exist in that branch. He replied [1]:

    "That's fine - stable folks usually know what to pick up. If not, I'll
    provide backports."


I cannot currently move to 6.12 for these systems, this has other consequences
and testing efforts.

Thanks,
Thomas

[1] https://lore.kernel.org/lkml/20241119111728.GAZzxzyHj8U99cEHQ8@fat_crate.local/