[Qemu-devel] [PATCH V7 1/5] runstate: introduce prelaunch-migrate state

[Jason Wang <jasowang@redhat.com>]

Sometimes, we need track the state when guest is just about to start after
migration. There's not a accurate state available which do this accurately
(consider qemu may started with -S in destination).

So this patch introduces a new state prelaunch-migrate which just tracks this
state, it covers the case both w/ and w/o -S in destination. The first user of
this is the support of doing announce by guest.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 migration.c      |    3 +--
 qapi-schema.json |    5 ++++-
 vl.c             |    4 +++-
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/migration.c b/migration.c
index 11725ae..ecdf2c5 100644
--- a/migration.c
+++ b/migration.c
@@ -107,10 +107,9 @@ static void process_incoming_migration_co(void *opaque)
     /* Make sure all file formats flush their mutable metadata */
     bdrv_invalidate_cache_all();
 
+    runstate_set(RUN_STATE_PRELAUNCH_MIGRATE);
     if (autostart) {
         vm_start();
-    } else {
-        runstate_set(RUN_STATE_PAUSED);
     }
 }
 
diff --git a/qapi-schema.json b/qapi-schema.json
index 28b070f..baa6361 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -174,11 +174,14 @@
 # @suspended: guest is suspended (ACPI S3)
 #
 # @watchdog: the watchdog action is configured to pause and has been triggered
+#
+# @migrate-prelaunch: migration is completed and QEMU were started with -S
 ##
 { 'enum': 'RunState',
   'data': [ 'debug', 'inmigrate', 'internal-error', 'io-error', 'paused',
             'postmigrate', 'prelaunch', 'finish-migrate', 'restore-vm',
-            'running', 'save-vm', 'shutdown', 'suspended', 'watchdog' ] }
+            'running', 'save-vm', 'shutdown', 'suspended', 'watchdog',
+            'prelaunch-migrate'] }
 
 ##
 # @SnapshotInfo
diff --git a/vl.c b/vl.c
index c03edf1..5dd2e0e 100644
--- a/vl.c
+++ b/vl.c
@@ -534,7 +534,7 @@ static const RunStateTransition runstate_transitions_def[] = {
     { RUN_STATE_DEBUG, RUN_STATE_RUNNING },
 
     { RUN_STATE_INMIGRATE, RUN_STATE_RUNNING },
-    { RUN_STATE_INMIGRATE, RUN_STATE_PAUSED },
+    { RUN_STATE_INMIGRATE, RUN_STATE_PRELAUNCH_MIGRATE },
 
     { RUN_STATE_INTERNAL_ERROR, RUN_STATE_PAUSED },
     { RUN_STATE_INTERNAL_ERROR, RUN_STATE_FINISH_MIGRATE },
@@ -580,6 +580,8 @@ static const RunStateTransition runstate_transitions_def[] = {
     { RUN_STATE_WATCHDOG, RUN_STATE_RUNNING },
     { RUN_STATE_WATCHDOG, RUN_STATE_FINISH_MIGRATE },
 
+    { RUN_STATE_PRELAUNCH_MIGRATE, RUN_STATE_RUNNING },
+
     { RUN_STATE_MAX, RUN_STATE_MAX },
 };
 
-- 
1.7.1