[Qemu-devel] [PATCH 7/9] virtio-serial-bus: Let the guest know of host connection changes after migration

[Amit Shah]

If the host connection to a port is closed on the destination machine
after migration, when the connection was open on the source, the host
has to be informed of that.

Similar for a host connection open on the destination.

Signed-off-by: Amit Shah <address@hidden>
---
 hw/virtio-serial-bus.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index dd50f2d..6d12c10 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -408,6 +408,7 @@ static void virtio_serial_save(QEMUFile *f, void *opaque)
     QTAILQ_FOREACH(port, &s->ports, next) {
         qemu_put_be32s(f, &port->id);
         qemu_put_byte(f, port->guest_connected);
+        qemu_put_byte(f, port->host_connected);
     }
 }
 
@@ -461,11 +462,21 @@ static int virtio_serial_load(QEMUFile *f, void *opaque, 
int version_id)
     /* Items in struct VirtIOSerialPort */
     for (i = 0; i < nr_active_ports; i++) {
         uint32_t id;
+        bool host_connected;
 
         id = qemu_get_be32(f);
         port = find_port_by_id(s, id);
 
         port->guest_connected = qemu_get_byte(f);
+        host_connected = qemu_get_byte(f);
+        if (host_connected != port->host_connected) {
+            /*
+             * We have to let the guest know of the host connection
+             * status change
+             */
+            send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN,
+                               port->host_connected);
+        }
     }
     return 0;
 }
-- 
1.6.2.5