[xen master] arinc653: don't assume Dom0 is the control domain

[patchbot@xxxxxxx]

commit 80f0d304a529d9f50923001dbfe5792060177a1b
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Apr 21 09:05:25 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Apr 21 09:05:25 2026 +0200

    arinc653: don't assume Dom0 is the control domain
    
    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>
    Reviewed-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
---
 xen/common/sched/arinc653.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/common/sched/arinc653.c b/xen/common/sched/arinc653.c
index 19249f6464..d8a5380557 100644
--- a/xen/common/sched/arinc653.c
+++ b/xen/common/sched/arinc653.c
@@ -411,10 +411,10 @@ a653sched_alloc_udata(const struct scheduler *ops, struct 
sched_unit *unit,
     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) && !is_idle_domain(unit->domain) )
     {
         entry = sched_priv->num_schedule_entries;
 
--
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