migration: split use of MigrationState.total_time

It was used either to:

1. store initial timestamp of migration start, and
2. store total time used by last migration

Let's provide two parameters for each of them.  Mix use of the two is
slightly misleading.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/migration/migration.c b/migration/migration.c
index 0b513c2020..23f6e5092c 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -619,7 +619,7 @@ static void fill_source_migration_info(MigrationInfo *info)
         info->has_status = true;
         info->has_total_time = true;
         info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
-            - s->total_time;
+            - s->start_time;
         info->has_expected_downtime = true;
         info->expected_downtime = s->expected_downtime;
         info->has_setup_time = true;
@@ -1300,7 +1300,8 @@ MigrationState *migrate_init(void)
 
     migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
 
-    s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+    s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+    s->total_time = 0;
     return s;
 }
 
@@ -2332,7 +2333,7 @@ static void *migration_thread(void *opaque)
     qemu_mutex_lock_iothread();
     if (s->state == MIGRATION_STATUS_COMPLETED) {
         uint64_t transferred_bytes = qemu_ftell(s->to_dst_file);
-        s->total_time = end_time - s->total_time;
+        s->total_time = end_time - s->start_time;
         if (!entered_postcopy) {
             s->downtime = end_time - start_time;
         }