spice migration: add QEVENT_SPICE_MIGRATE_COMPLETED

When migrating, libvirt queries the migration status, and upon migration
completions, it closes the migration src. On the other hand, when
migration is completed, spice transfers data from the src to destination
via the client. This data is required for keeping the spice session
after migration, without suffering from data loss and inconsistencies.
In order to allow this data transfer, we add QEVENT for signaling
libvirt that spice migration has completed, and libvirt needs to wait
for this event before quitting the src process.

Signed-off-by: Yonit Halperin <yhalperi@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

3 files changed, 10 insertions, 1 deletions

diff --git a/monitor.c b/monitor.c
index b17b1bb..413edf4 100644
--- a/monitor.c
+++ b/monitor.c
@@ -455,6 +455,7 @@ static const char *monitor_event_names[] = {
     [QEVENT_SUSPEND_DISK] = "SUSPEND_DISK",
     [QEVENT_WAKEUP] = "WAKEUP",
     [QEVENT_BALLOON_CHANGE] = "BALLOON_CHANGE",
+    [QEVENT_SPICE_MIGRATE_COMPLETED] = "SPICE_MIGRATE_COMPLETED",
 };
 QEMU_BUILD_BUG_ON(ARRAY_SIZE(monitor_event_names) != QEVENT_MAX)
 
diff --git a/monitor.h b/monitor.h
index 47d556b..5fc2983 100644
--- a/monitor.h
+++ b/monitor.h
@@ -43,6 +43,7 @@ typedef enum MonitorEvent {
     QEVENT_SUSPEND_DISK,
     QEVENT_WAKEUP,
     QEVENT_BALLOON_CHANGE,
+    QEVENT_SPICE_MIGRATE_COMPLETED,
 
     /* Add to 'monitor_event_names' array in monitor.c when
      * defining new events here */
diff --git a/ui/spice-core.c b/ui/spice-core.c
index 1a7a773..851e869 100644
--- a/ui/spice-core.c
+++ b/ui/spice-core.c
@@ -285,6 +285,7 @@ typedef struct SpiceMigration {
 } SpiceMigration;
 
 static void migrate_connect_complete_cb(SpiceMigrateInstance *sin);
+static void migrate_end_complete_cb(SpiceMigrateInstance *sin);
 
 static const SpiceMigrateInterface migrate_interface = {
     .base.type = SPICE_INTERFACE_MIGRATION,
@@ -292,7 +293,7 @@ static const SpiceMigrateInterface migrate_interface = {
     .base.major_version = SPICE_INTERFACE_MIGRATION_MAJOR,
     .base.minor_version = SPICE_INTERFACE_MIGRATION_MINOR,
     .migrate_connect_complete = migrate_connect_complete_cb,
-    .migrate_end_complete = NULL,
+    .migrate_end_complete = migrate_end_complete_cb,
 };
 
 static SpiceMigration spice_migrate;
@@ -305,6 +306,11 @@ static void migrate_connect_complete_cb(SpiceMigrateInstance *sin)
     }
     sm->connect_complete.cb = NULL;
 }
+
+static void migrate_end_complete_cb(SpiceMigrateInstance *sin)
+{
+    monitor_protocol_event(QEVENT_SPICE_MIGRATE_COMPLETED, NULL);
+}
 #endif
 
 /* config string parsing */
@@ -489,6 +495,7 @@ static void migration_state_notifier(Notifier *notifier, void *data)
     } else if (migration_has_finished(s)) {
 #ifndef SPICE_INTERFACE_MIGRATION
         spice_server_migrate_switch(spice_server);
+        monitor_protocol_event(QEVENT_SPICE_MIGRATE_COMPLETED, NULL);
 #else
         spice_server_migrate_end(spice_server, true);
     } else if (migration_has_failed(s)) {