migration: export parameters to props

Export migration parameters to qdev properties. Then we can use, for
example:

  -global migration.x-cpu-throttle-initial=xxx

To specify migration parameters during init.

Prefix "x-" is appended for each parameter exported to show that this is
not a stable interface, and only for debugging/testing purpose.

Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <1500349150-13240-3-git-send-email-peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

migration/migration.c

@@ -2010,6 +2010,31 @@ static Property migration_properties[] = {
                      send_configuration, true),
     DEFINE_PROP_BOOL("send-section-footer", MigrationState,
                      send_section_footer, true),
+
+    /* Migration parameters */
+    DEFINE_PROP_INT64("x-compress-level", MigrationState,
+                      parameters.compress_level,
+                      DEFAULT_MIGRATE_COMPRESS_LEVEL),
+    DEFINE_PROP_INT64("x-compress-threads", MigrationState,
+                      parameters.compress_threads,
+                      DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
+    DEFINE_PROP_INT64("x-decompress-threads", MigrationState,
+                      parameters.decompress_threads,
+                      DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
+    DEFINE_PROP_INT64("x-cpu-throttle-initial", MigrationState,
+                      parameters.cpu_throttle_initial,
+                      DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
+    DEFINE_PROP_INT64("x-cpu-throttle-increment", MigrationState,
+                      parameters.cpu_throttle_increment,
+                      DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
+    DEFINE_PROP_INT64("x-max-bandwidth", MigrationState,
+                      parameters.max_bandwidth, MAX_THROTTLE),
+    DEFINE_PROP_INT64("x-downtime-limit", MigrationState,
+                      parameters.downtime_limit,
+                      DEFAULT_MIGRATE_SET_DOWNTIME),
+    DEFINE_PROP_INT64("x-checkpoint-delay", MigrationState,
+                      parameters.x_checkpoint_delay,
+                      DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -2028,16 +2053,6 @@ static void migration_instance_init(Object *obj)
     ms->state = MIGRATION_STATUS_NONE;
     ms->xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE;
     ms->mbps = -1;
-    ms->parameters = (MigrationParameters) {
-        .compress_level = DEFAULT_MIGRATE_COMPRESS_LEVEL,
-        .compress_threads = DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT,
-        .decompress_threads = DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT,
-        .cpu_throttle_initial = DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL,
-        .cpu_throttle_increment = DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT,
-        .max_bandwidth = MAX_THROTTLE,
-        .downtime_limit = DEFAULT_MIGRATE_SET_DOWNTIME,
-        .x_checkpoint_delay = DEFAULT_MIGRATE_X_CHECKPOINT_DELAY,
-    };
     ms->parameters.tls_creds = g_strdup("");
     ms->parameters.tls_hostname = g_strdup("");
 }