migration: create Migration Incoming State at init time

Signed-off-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <1485207141-1941-3-git-send-email-quintela@redhat.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

include/migration/migration.h

@@ -122,7 +122,6 @@ struct MigrationIncomingState {
 };
 
 MigrationIncomingState *migration_incoming_get_current(void);
-MigrationIncomingState *migration_incoming_state_new(QEMUFile *f);
 void migration_incoming_state_destroy(void);
 
 /*

migration/migration.c

@@ -111,32 +111,28 @@ MigrationState *migrate_get_current(void)
     return &current_migration;
 }
 
-/* For incoming */
-static MigrationIncomingState *mis_current;
-
 MigrationIncomingState *migration_incoming_get_current(void)
 {
-    return mis_current;
-}
-
-MigrationIncomingState *migration_incoming_state_new(QEMUFile* f)
-{
-    mis_current = g_new0(MigrationIncomingState, 1);
-    mis_current->from_src_file = f;
-    mis_current->state = MIGRATION_STATUS_NONE;
-    QLIST_INIT(&mis_current->loadvm_handlers);
-    qemu_mutex_init(&mis_current->rp_mutex);
-    qemu_event_init(&mis_current->main_thread_load_event, false);
+    static bool once;
+    static MigrationIncomingState mis_current;
 
-    return mis_current;
+    if (!once) {
+        mis_current.state = MIGRATION_STATUS_NONE;
+        memset(&mis_current, 0, sizeof(MigrationIncomingState));
+        QLIST_INIT(&mis_current.loadvm_handlers);
+        qemu_mutex_init(&mis_current.rp_mutex);
+        qemu_event_init(&mis_current.main_thread_load_event, false);
+        once = true;
+    }
+    return &mis_current;
 }
 
 void migration_incoming_state_destroy(void)
 {
-    qemu_event_destroy(&mis_current->main_thread_load_event);
-    loadvm_free_handlers(mis_current);
-    g_free(mis_current);
-    mis_current = NULL;
+    struct MigrationIncomingState *mis = migration_incoming_get_current();
+
+    qemu_event_destroy(&mis->main_thread_load_event);
+    loadvm_free_handlers(mis);
 }
 
 
@@ -382,11 +378,11 @@ static void process_incoming_migration_bh(void *opaque)
 static void process_incoming_migration_co(void *opaque)
 {
     QEMUFile *f = opaque;
-    MigrationIncomingState *mis;
+    MigrationIncomingState *mis = migration_incoming_get_current();
     PostcopyState ps;
     int ret;
 
-    mis = migration_incoming_state_new(f);
+    mis->from_src_file = f;
     postcopy_state_set(POSTCOPY_INCOMING_NONE);
     migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
                       MIGRATION_STATUS_ACTIVE);

migration/savevm.c

@@ -2199,7 +2199,6 @@ void qmp_xen_load_devices_state(const char *filename, Error **errp)
     qio_channel_set_name(QIO_CHANNEL(ioc), "migration-xen-load-state");
     f = qemu_fopen_channel_input(QIO_CHANNEL(ioc));
 
-    migration_incoming_state_new(f);
     ret = qemu_loadvm_state(f);
     qemu_fclose(f);
     if (ret < 0) {
@@ -2215,6 +2214,7 @@ int load_vmstate(const char *name)
     QEMUFile *f;
     int ret;
     AioContext *aio_context;
+    MigrationIncomingState *mis = migration_incoming_get_current();
 
     if (!bdrv_all_can_snapshot(&bs)) {
         error_report("Device '%s' is writable but does not support snapshots.",
@@ -2265,7 +2265,7 @@ int load_vmstate(const char *name)
     }
 
     qemu_system_reset(VMRESET_SILENT);
-    migration_incoming_state_new(f);
+    mis->from_src_file = f;
 
     aio_context_acquire(aio_context);
     ret = qemu_loadvm_state(f);