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Re: [PATCH v2] x86/ucode/AMD: apply the patch early on every logical thread
- To: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 16 Jan 2023 15:46:59 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 16 Jan 2023 14:47:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.01.2023 15:23, Sergey Dyasli wrote:
> --- a/xen/arch/x86/cpu/microcode/amd.c
> +++ b/xen/arch/x86/cpu/microcode/amd.c
> @@ -176,8 +176,13 @@ static enum microcode_match_result compare_revisions(
> if ( new_rev > old_rev )
> return NEW_UCODE;
>
> - if ( opt_ucode_allow_same && new_rev == old_rev )
> - return NEW_UCODE;
> + if ( new_rev == old_rev )
> + {
> + if ( opt_ucode_allow_same )
> + return NEW_UCODE;
> + else
> + return SAME_UCODE;
> + }
I find this misleading: "same" should not depend on the command line
option. In fact the command line option should affect only the cases
where ucode is actually to be loaded; it should not affect cases where
the check is done merely to know whether the cache needs updating.
With that e.g. microcode_update_helper() should then also be adjusted:
It shouldn't say merely "newer" when "allow-same" is in effect.
Jan
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