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-rw-r--r--drivers/xen/events.c12
-rw-r--r--include/xen/events.h3
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index ac0e22826357..0ac7a149e7f2 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -1508,6 +1508,18 @@ void xen_poll_irq(int irq)
xen_poll_irq_timeout(irq, 0 /* no timeout */);
}
+/* Check whether the IRQ line is shared with other guests. */
+int xen_test_irq_shared(int irq)
+{
+ struct irq_info *info = info_for_irq(irq);
+ struct physdev_irq_status_query irq_status = { .irq = info->u.pirq.pirq };
+
+ if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
+ return 0;
+ return !(irq_status.flags & XENIRQSTAT_shared);
+}
+EXPORT_SYMBOL_GPL(xen_test_irq_shared);
+
void xen_irq_resume(void)
{
unsigned int cpu, evtchn;
diff --git a/include/xen/events.h b/include/xen/events.h
index 9aecc0b5a0e6..932e54051d3e 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -95,4 +95,7 @@ int xen_destroy_irq(int irq);
/* Return irq from pirq */
int xen_irq_from_pirq(unsigned pirq);
+/* Determine whether to ignore this IRQ if it is passed to a guest. */
+int xen_test_irq_shared(int irq);
+
#endif /* _XEN_EVENTS_H */