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Re: [PATCH 2/3] x86/ucode: Rework AMD's microcode_fits()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 12 Nov 2024 11:58:01 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 12 Nov 2024 10:58:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08.11.2024 15:42, Andrew Cooper wrote:
> This function is overloaded, creating complexity; 3 of 4 callers already only
> want it for it's "applicable to this CPU or not" answer, and handle revision
> calculations separately.
>
> Change it to be microcode_fits_cpu(), returning a simple boolean. The
> checking of the equiv table can be simplified substantially too; A mapping
> will only be inserted if it's correct for the CPU, so any nonzero equiv.sig
> suffices to know that equiv.id is correct.
>
> Drop compare_header() too, which is simiarly overloaded, and use
> compare_revisions() directly.
>
> Notably, this removes a path where cpu_request_microcode() inspects
> currently-loaded microcode revision, just to discard the answer.
>
> No functional change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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