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Re: [PATCH 3/6] x86/match-cpu: Introduce X86_MATCH_VFM() and convert intel_idle_ids[]
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 17 Jul 2025 09:35:19 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 17 Jul 2025 07:35:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.07.2025 19:31, Andrew Cooper wrote:
> mwait-idle's ICPU() is the most convenient place to get started. Introduce
> X86_MATCH_CPU() and X86_MATCH_VFM() following their Linux counterparts.
>
> This involves match-cpu.h including more headers, which in turn allows us to
> drop a few.
intel-cpu.h doesn't really need to move, does it? Conceivably there can be users
of match-cpu.h which don't need the Intel constants. Hence no point in forcing
them to see those.
> No functional change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>
> We now have X86_FEATURE_ANY and X86_FEATURE_ALWAYS as aliases of LM. Given
> the contexts they're used in, I've left the naming as-is.
What's wrong with sticking to ALWAYS, which we already have?
> It's a bit nasty (preprocessing wise) triple-expanding VFM in X86_MATCH_VFM(),
> but we need an Integer Constant Expression.
Not sure what alternative you're alluding to, or in fact what nastiness you're
seeing. But maybe I'm getting "triple-expanding" wrong: To me that means going
through three layers of expansion, when you may mean the fact that
X86_MATCH_VFM() evaluates its parameter three times. If so - yes, but as you
say: What do you do (in this case).
Jan
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