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Re: [PATCH 6/6] x86/apic: Convert the TSC deadline errata table to X86_MATCH_*()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 17 Jul 2025 11:33:36 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 17 Jul 2025 09:33:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.07.2025 11:02, Andrew Cooper wrote:
> On 17/07/2025 9:26 am, Jan Beulich wrote:
>> On 16.07.2025 19:31, 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[].
>> I'm fine with the patch in principle, but I wonder how you envision to
>> support
>> a match for multiple steppings in one go then. In particular
>> macro-naming-wise.
>
> The Linux version uses
>
> X86_MATCH_VFM_STEPS(vfm, min_step, max_step, data)
Hmm, yes, something like that (naming-wise at least) may be possible to use.
It'll be potentially a little confusing, but I guess we'll manage. Or maybe ...
> and calls GENMASK(min_step, max_step) but for a single stepping that
> causes rows which look like:
>
> X86_MATCH_VFM_STEPS(INTEL_HASWELL_X, 0x2, 0x2, 0x3a), /* EP */
>
>
> Even in Linux, there are very few examples which take a genuine range,
> and nothing so far that we need in Xen, so I implemented a slightly
> different helper.
... we get away without ever needing such.
Jan
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