From 6ed4b7c0b0ed061925036744f60e376194cd67a3 Mon Sep 17 00:00:00 2001

From: Alon Levy <alevy@redhat.com>

Date: Thu, 28 Jul 2011 15:08:48 +0300

Subject: [PATCH] virtio-serial-bus: replay guest_open on migration

When migrating a host with with a spice agent running the mouse becomes

non operational after the migration. This is rhbz #725965.

The problem is that after migration spice doesn't know the guest agent is open.

Spice is just a char dev here. And a chardev cannot query it's device, the

device has to let the chardev know when it is open. Right now after migration

the chardev which is recreated is in it's default state, which assumes the

guest is disconnected.

Char devices carry no information across migration, but the virtio-serial does

already carry the guest_connected state. This patch passes that bit to the

chardev.

Signed-off-by: Alon Levy <alevy@redhat.com>

---

 hw/virtio-serial-bus.c | 6 ++++++

 1 file changed, 6 insertions(+)

diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c

index 82073f5..18c2ed3 100644

--- a/hw/virtio-serial-bus.c

+++ b/hw/virtio-serial-bus.c

@@ -682,6 +682,7 @@ static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id)

     for (i = 0; i < nr_active_ports; i++) {

         uint32_t id;

         bool host_connected;

+        VirtIOSerialPortClass *vsc;

         id = qemu_get_be32(f);

         port = find_port_by_id(s, id);

@@ -690,6 +691,11 @@ static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id)

         }

         port->guest_connected = qemu_get_byte(f);

+        vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);

+        if (port->guest_connected && vsc->guest_open) {

+            /* replay guest open */

+            vsc->guest_open(port);

+        }

         host_connected = qemu_get_byte(f);

         if (host_connected != port->host_connected) {

             /*

-- 

1.7.11.2