From 81ab56732f4990c288c88a545925dc4431c313d2 Mon Sep 17 00:00:00 2001

From: Alon Levy <alevy@redhat.com>

Date: Fri, 16 Nov 2012 16:24:47 +0200

Subject: [PATCH] hw/virtio-serial-bus: replay guest open on destination

This is rewrite of a patch carried in Fedora previously based

on new code upstream, here is the original message, it still applies:

(the original fedora patch was commit id

a9bc20afc1f0604ee81c23b7c67d627e51d2e8d4, this is useful for grepping in

logs, it isn't in upstream)

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.

---

 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 aa7d0d7..5078129 100644

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

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

@@ -642,6 +642,7 @@ static void virtio_serial_post_load_timer_cb(void *opaque)

     VirtIOSerial *s = opaque;

     VirtIOSerialPort *port;

     uint8_t host_connected;

+    VirtIOSerialPortClass *vsc;

     if (!s->post_load) {

         return;

@@ -657,6 +658,11 @@ static void virtio_serial_post_load_timer_cb(void *opaque)

             send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN,

                                port->host_connected);

         }

+        vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);

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

+            /* replay guest open */

+            vsc->guest_open(port);

+        }

     }

     g_free(s->post_load->connected);

     qemu_free_timer(s->post_load->timer);