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Re: [XEN][PATCH] xen/evtchn: enable build optimization for evtchn_move_pirqs()/send_guest_pirq()
- To: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 17 Jul 2025 15:10:43 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Ayan Kumar Halder <ayankuma@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 17 Jul 2025 13:11:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.07.2025 15:01, Grygorii Strashko wrote:
> --- a/xen/common/event_channel.c
> +++ b/xen/common/event_channel.c
> @@ -975,6 +975,9 @@ void send_guest_pirq(struct domain *d, const struct pirq
> *pirq)
> int port;
> struct evtchn *chn;
>
> + if (!IS_ENABLED(CONFIG_HAS_PIRQ))
> + return;
> +
> /*
> * PV guests: It should not be possible to race with __evtchn_close().
> The
> * caller of this function must synchronise with pirq_guest_unbind().
Isn't this function unreachable on Arm, and hence a Misra rule 2.1 violation,
requiring #ifdef around the entire function to address?
> @@ -1710,10 +1713,15 @@ void evtchn_destroy_final(struct domain *d)
> void evtchn_move_pirqs(struct vcpu *v)
> {
> struct domain *d = v->domain;
> - const cpumask_t *mask = cpumask_of(v->processor);
> + const cpumask_t *mask;
This change shouldn't be necessary; compilers ought to be able to DCE the
code.
> unsigned int port;
> struct evtchn *chn;
>
> + if (!IS_ENABLED(CONFIG_HAS_PIRQ))
Nit (style): Missing blanks (see other nearby if()-s).
I wonder though whether we wouldn't better have x86'es arch_move_irqs()
invoke this function, and then #ifdef it out here altogether as well.
Jan
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