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Re: [PATCH v2 3/3] x86/apic: Convert the TSC deadline errata table to X86_MATCH_*()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 21 Jul 2025 08:47:21 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 21 Jul 2025 06:47:39 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.07.2025 16:20, Andrew Cooper wrote:
> With the ability to match on steppings, introduce a new X86_MATCH_VFMS()
> helper to match a specific stepping, and use it to rework deadline_match[].
>
> Currently, the table is scanned on all systems, even those without the
> TSC_DEADLINE feature. Introduce another early exit for that case, which
> removes the need to encode every row in the table with TSC_DEADLINE.
>
> Notably this removes the overloading of driver_data possibly being a function
> pointer, and removes the latent bug where the target functions are missing
> ENDBR instructions owing to the lack of the cf_check attribute.
>
> No functional change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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