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Re: [PATCH v2 2/3] arinc653: don't assume Dom0 is the control domain
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Wed, 25 Mar 2026 14:38:39 +0100
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- Cc: Nathan Studer <nathan.studer@xxxxxxxxxxxxxxx>, Stewart Hildebrand <stewart@xxxxxxx>
- Delivery-date: Wed, 25 Mar 2026 13:38:43 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.03.26 13:54, Jan Beulich wrote:
Leaving aside highly disaggregated environments, the control domain is
what will invoke XEN_SYSCTL_SCHEDOP_putinfo. Its vCPU-s therefore need to
be able to run unconditionally, not those of the domain with ID 0 (which
may not exist at all).
Fixes: 9f0c658baedc ("arinc: add cpu-pool support to scheduler")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
---
There being no "else" to the if(), what about other control domain vCPU-s?
a653sched_alloc_udata() is called for all units of a domain.
And why are they added to all scheduler instances?
What do you mean with "added to all scheduler instances"?
a653sched_alloc_udata() will be called only for the units of a domain being
in the instance (i.e. cpupool) designated by the ops parameter.
---
v2: New.
--- a/xen/common/sched/arinc653.c
+++ b/xen/common/sched/arinc653.c
@@ -411,10 +411,10 @@ a653sched_alloc_udata(const struct sched
spin_lock_irqsave(&sched_priv->lock, flags);
/*
- * Add every one of dom0's units to the schedule, as long as there are
- * slots available.
+ * Add every one of the control domain's units to the schedule, as long as
+ * there are slots available.
*/
- if ( unit->domain->domain_id == 0 )
+ if ( is_control_domain(unit->domain) )
{
entry = sched_priv->num_schedule_entries;
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