xen: fix save/restore for PV on HVM guests with pirq remapping
Re-map and re-bind all the pirqs at resume time.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index f78945c..f34288a 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -1293,6 +1293,42 @@
return ret;
}
+static void restore_cpu_pirqs(void)
+{
+ int pirq, rc, irq, gsi;
+ struct physdev_map_pirq map_irq;
+
+ for (pirq = 0; pirq < nr_irqs; pirq++) {
+ irq = pirq_to_irq[pirq];
+ if (irq == -1)
+ continue;
+
+ /* save/restore of PT devices doesn't work, so at this point the
+ * only devices present are GSI based emulated devices */
+ gsi = gsi_from_irq(irq);
+ if (!gsi)
+ continue;
+
+ map_irq.domid = DOMID_SELF;
+ map_irq.type = MAP_PIRQ_TYPE_GSI;
+ map_irq.index = gsi;
+ map_irq.pirq = pirq;
+
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
+ if (rc) {
+ printk(KERN_WARNING "xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
+ gsi, irq, pirq, rc);
+ irq_info[irq] = mk_unbound_info();
+ pirq_to_irq[pirq] = -1;
+ continue;
+ }
+
+ printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
+
+ startup_pirq(irq);
+ }
+}
+
static void restore_cpu_virqs(unsigned int cpu)
{
struct evtchn_bind_virq bind_virq;
@@ -1436,6 +1472,8 @@
unmask_evtchn(evtchn);
}
+
+ restore_cpu_pirqs();
}
static struct irq_chip xen_dynamic_chip __read_mostly = {