seamless migration: pre migration phase on the destination side

- handle SPICE_MSGC_MAIN_MIGRATE_DST_DO_SEAMLESS
- reply with SPICE_MSG_MAIN_MIGRATE_DST_SEAMLESS_ACK/NACK
- prepare the channels for migration according to the migration
   type (semi/seamless)

see spice-protocol for more details:
commit 3838ad140a046c4ddf42fef58c9727ecfdc09f9f

1 files changed, 3 insertions, 0 deletions

diff --git a/server/reds.h b/server/reds.h
index b3a31558..71a0173f 100644
--- a/server/reds.h
+++ b/server/reds.h
@@ -154,6 +154,9 @@ void reds_on_main_migrate_connected(int seamless); //should be called when all t
                                                    // are connected to the target
 void reds_on_main_receive_migrate_data(MainMigrateData *data, uint8_t *end);
 void reds_on_main_mouse_mode_request(void *message, size_t size);
+/* migration dest side: returns whether it can support seamless migration
+ * with the given src migration protocol version */
+int reds_on_migrate_dst_set_seamless(MainChannelClient *mcc, uint32_t src_version);
 void reds_on_client_migrate_complete(RedClient *client);
 void reds_on_char_device_state_destroy(SpiceCharDeviceState *dev);