[Qemu-devel] [PATCH 2/3] migration: export parameters to props

[Peter Xu <peterx@redhat.com>]

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

  -global migration.cpu-throttle-initial=xxx

To specify migration parameters during init.

One thing to mention is that, this usage should only be used for
debugging/testing purpose, and should never be used elsewhere.
Meanwhile, we don't guarantee the compatibility of this interface. It
can alter anytime in the future.

(Ok, it won't change a lot. But it'll just work like HMP - Let's just be
 prepare for any possible change to it)

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/migration.c | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index a0db40d..fd00670 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2009,6 +2009,31 @@ static Property migration_properties[] = {
                      send_configuration, true),
     DEFINE_PROP_BOOL("send-section-footer", MigrationState,
                      send_section_footer, true),
+
+    /* Migration parameters */
+    DEFINE_PROP_INT64("compress-level", MigrationState,
+                      parameters.compress_level,
+                      DEFAULT_MIGRATE_COMPRESS_LEVEL),
+    DEFINE_PROP_INT64("compress-threads", MigrationState,
+                      parameters.compress_threads,
+                      DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
+    DEFINE_PROP_INT64("decompress-threads", MigrationState,
+                      parameters.decompress_threads,
+                      DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
+    DEFINE_PROP_INT64("cpu-throttle-initial", MigrationState,
+                      parameters.cpu_throttle_initial,
+                      DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
+    DEFINE_PROP_INT64("cpu-throttle-increment", MigrationState,
+                      parameters.cpu_throttle_increment,
+                      DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
+    DEFINE_PROP_INT64("max-bandwidth", MigrationState,
+                      parameters.max_bandwidth, MAX_THROTTLE),
+    DEFINE_PROP_INT64("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(),
 };
 
@@ -2027,16 +2052,6 @@ 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("");
 }
-- 
2.7.4