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[Xen-devel] [PATCHv1] xen/events: bind all new interdomain events to VCPU0

From: David Vrabel <david.vrabel@xxxxxxxxxx>

Commit fc087e10734a4d3e40693fc099461ec1270b3fff (xen/events: remove
unnecessary init_evtchn_cpu_bindings()) causes a regression.

The kernel-side VCPU binding was not being correctly set for newly
allocated or bound interdomain events.  In ARM guests where 2-level
events were used, this would result in no interdomain events being
handled because the kernel-side VCPU masks would all be clear.

x86 guests would work because the irq affinity was set during irq
setup and this would set the correct kernel-side VCPU binding.

Fix this by properly initializing the kernel-side VCPU binding in

Reported-and-tested-by: Julien Grall <julien.grall@xxxxxxxxxx>
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
 drivers/xen/events/events_base.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 4672e00..f4a9e33 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -862,6 +862,8 @@ int bind_evtchn_to_irq(unsigned int evtchn)
                        irq = ret;
                        goto out;
+               /* New interdomain events are bound to VCPU 0. */
+               bind_evtchn_to_cpu(evtchn, 0);
        } else {
                struct irq_info *info = info_for_irq(irq);
                WARN_ON(info == NULL || info->type != IRQT_EVTCHN);

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