[Xen-devel] [PATCH 4/5] xen: fix save/restore for PV on HVM guests with pirq remapping

[stefano.stabellini@xxxxxxxxxxxxx]

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Re-map and re-bind all the pirqs at resume time.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 drivers/xen/events.c |   38 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 38 insertions(+), 0 deletions(-)

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 @@ static int retrigger_dynirq(unsigned int irq)
        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 @@ void xen_irq_resume(void)
 
                unmask_evtchn(evtchn);
        }
+
+       restore_cpu_pirqs();
 }
 
 static struct irq_chip xen_dynamic_chip __read_mostly = {
-- 
1.5.6.5


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