[Qemu-devel] [PATCH] migration: Introduce migration_in_completion()

[Pavel Fedin <p.fedin@samsung.com>]

This allows to signal migration notifiers that the migration has entered
final phase. The condition is set after vm_stop_force_state().

This will be necessary for ITS live migration on ARM, which will have to
dump its state into guest RAM at this point.

Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
---
 include/migration/migration.h | 2 ++
 migration/migration.c         | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/include/migration/migration.h b/include/migration/migration.h
index 8334621..51b0ea2 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -69,6 +69,7 @@ struct MigrationState
     int parameters[MIGRATION_PARAMETER_MAX];
 
     int state;
+    bool in_completion;
     MigrationParams params;
     double mbps;
     int64_t total_time;
@@ -117,6 +118,7 @@ int migrate_fd_close(MigrationState *s);
 void add_migration_state_change_notifier(Notifier *notify);
 void remove_migration_state_change_notifier(Notifier *notify);
 bool migration_in_setup(MigrationState *);
+bool migration_in_completion(MigrationState *);
 bool migration_has_finished(MigrationState *);
 bool migration_has_failed(MigrationState *);
 MigrationState *migrate_get_current(void);
diff --git a/migration/migration.c b/migration/migration.c
index b092f38..f4a2421 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -674,6 +674,11 @@ bool migration_in_setup(MigrationState *s)
     return s->state == MIGRATION_STATUS_SETUP;
 }
 
+bool migration_in_completion(MigrationState *s)
+{
+    return s->in_completion;
+}
+
 bool migration_has_finished(MigrationState *s)
 {
     return s->state == MIGRATION_STATUS_COMPLETED;
@@ -996,6 +1001,8 @@ static void migration_completion(MigrationState *s, bool *old_vm_running,
     if (!ret) {
         ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
         if (ret >= 0) {
+            s->in_completion = true;
+            notifier_list_notify(&migration_state_notifiers, s);
             qemu_file_set_rate_limit(s->file, INT64_MAX);
             qemu_savevm_state_complete(s->file);
         }
-- 
1.9.5.msysgit.0