Re: Old microcode CPU matching issue - x86/microcode/intel: Refresh the revisions that determine old_microcode

[Dave Hansen]

On 10/22/25 10:53, Dave Hansen wrote:
> I think this is a platform mismatch problem. The microcode file for
> 06-8f-08 has two different versions for two different platforms:
> 
> 	$ iucode-tool --list-all intel-ucode/06-8f-08 
> 	...
> 	           sig 0x000806f8, pf_mask 0x10, 2025-04-08, rev 0x2c000401
> 	...
> 	           sig 0x000806f8, pf_mask 0x87, 2025-04-04, rev 0x2b000643
> 
> Note the pf_mask and rev deltas here:      ^^^^                  ^^^^^^^^^^
> 
> I guess we'll need to take those into consideration, both adding pf_mask to
> the match list and actually matching on it.

Jon,

Here is a completely untested series that might fix your issue:

https://git.kernel.org/pub/scm/linux/kernel/git/daveh/devel.git/log/?h=old-ucode-platform

It attempts to take IA32_PLATFORM_ID into account when considering
old microcode.