[Qemu-devel] [PATCH COLO-Frame v8 05/34] migration: Add state records for migration incoming

[zhanghailiang]

For migration destination, we also need to know its state,
we will use it in COLO.

Here we add a new member 'state' for MigrationIncomingState,
and also use migrate_set_state() to modify its value.
We fix the first parameter of migrate_set_state(), and make it
public.

Signed-off-by: zhanghailiang <address@hidden>
---
 include/migration/migration.h |  3 +++
 migration/migration.c         | 38 +++++++++++++++++++++++---------------
 2 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/include/migration/migration.h b/include/migration/migration.h
index 5fd61a3..6fde8df 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -50,6 +50,7 @@ typedef QLIST_HEAD(, LoadStateEntry) LoadStateEntry_Head;
 struct MigrationIncomingState {
     QEMUFile *file;
 
+    int state;
     /* See savevm.c */
     LoadStateEntry_Head loadvm_handlers;
 };
@@ -82,6 +83,8 @@ struct MigrationState
     int64_t dirty_sync_count;
 };
 
+void migrate_set_state(int *state, int old_state, int new_state);
+
 void process_incoming_migration(QEMUFile *f);
 
 void qemu_start_incoming_migration(const char *uri, Error **errp);
diff --git a/migration/migration.c b/migration/migration.c
index 70ca246..08628c2 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -89,6 +89,7 @@ MigrationIncomingState 
*migration_incoming_state_new(QEMUFile* f)
 {
     mis_current = g_malloc0(sizeof(MigrationIncomingState));
     mis_current->file = f;
+    mis_current->state = MIGRATION_STATUS_NONE;
     QLIST_INIT(&mis_current->loadvm_handlers);
 
     return mis_current;
@@ -263,11 +264,13 @@ void qemu_start_incoming_migration(const char *uri, Error 
**errp)
 static void process_incoming_migration_co(void *opaque)
 {
     QEMUFile *f = opaque;
+    MigrationIncomingState *mis;
     Error *local_err = NULL;
     int ret;
 
-    migration_incoming_state_new(f);
-    migrate_generate_event(MIGRATION_STATUS_ACTIVE);
+    mis = migration_incoming_state_new(f);
+    migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
+                      MIGRATION_STATUS_ACTIVE);
     ret = qemu_loadvm_state(f);
 
     qemu_fclose(f);
@@ -275,12 +278,14 @@ static void process_incoming_migration_co(void *opaque)
     migration_incoming_state_destroy();
 
     if (ret < 0) {
-        migrate_generate_event(MIGRATION_STATUS_FAILED);
+        migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
+                          MIGRATION_STATUS_FAILED);
         error_report("load of migration failed: %s", strerror(-ret));
         migrate_decompress_threads_join();
         exit(EXIT_FAILURE);
     }
-    migrate_generate_event(MIGRATION_STATUS_COMPLETED);
+    migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
+                      MIGRATION_STATUS_COMPLETED);
     qemu_announce_self();
 
     /* Make sure all file formats flush their mutable metadata */
@@ -536,9 +541,9 @@ void qmp_migrate_set_parameters(bool has_compress_level,
 
 /* shared migration helpers */
 
-static void migrate_set_state(MigrationState *s, int old_state, int new_state)
+void migrate_set_state(int *state, int old_state, int new_state)
 {
-    if (atomic_cmpxchg(&s->state, old_state, new_state) == old_state) {
+    if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
         trace_migrate_set_state(new_state);
         migrate_generate_event(new_state);
     }
@@ -567,7 +572,7 @@ static void migrate_fd_cleanup(void *opaque)
     if (s->state != MIGRATION_STATUS_COMPLETED) {
         qemu_savevm_state_cancel();
         if (s->state == MIGRATION_STATUS_CANCELLING) {
-            migrate_set_state(s, MIGRATION_STATUS_CANCELLING,
+            migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING,
                               MIGRATION_STATUS_CANCELLED);
         }
     }
@@ -579,7 +584,8 @@ void migrate_fd_error(MigrationState *s)
 {
     trace_migrate_fd_error();
     assert(s->file == NULL);
-    migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_FAILED);
+    migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
+                      MIGRATION_STATUS_FAILED);
     notifier_list_notify(&migration_state_notifiers, s);
 }
 
@@ -595,7 +601,7 @@ static void migrate_fd_cancel(MigrationState *s)
             old_state != MIGRATION_STATUS_ACTIVE) {
             break;
         }
-        migrate_set_state(s, old_state, MIGRATION_STATUS_CANCELLING);
+        migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
     } while (s->state != MIGRATION_STATUS_CANCELLING);
 
     /*
@@ -663,7 +669,7 @@ static MigrationState *migrate_init(const MigrationParams 
*params)
     s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
                decompress_thread_count;
     s->bandwidth_limit = bandwidth_limit;
-    migrate_set_state(s, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
+    migrate_set_state(&s->state, MIGRATION_STATUS_NONE, 
MIGRATION_STATUS_SETUP);
 
     s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
     return s;
@@ -761,7 +767,8 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
     } else {
         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
                    "a valid migration protocol");
-        migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_FAILED);
+        migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
+                          MIGRATION_STATUS_FAILED);
         return;
     }
 
@@ -941,7 +948,8 @@ static void *migration_thread(void *opaque)
     qemu_savevm_state_begin(s->file, &s->params);
 
     s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
-    migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_ACTIVE);
+    migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
+                      MIGRATION_STATUS_ACTIVE);
 
     while (s->state == MIGRATION_STATUS_ACTIVE) {
         int64_t current_time;
@@ -971,13 +979,13 @@ static void *migration_thread(void *opaque)
                 qemu_mutex_unlock_iothread();
 
                 if (ret < 0) {
-                    migrate_set_state(s, MIGRATION_STATUS_ACTIVE,
+                    migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE,
                                       MIGRATION_STATUS_FAILED);
                     break;
                 }
 
                 if (!qemu_file_get_error(s->file)) {
-                    migrate_set_state(s, MIGRATION_STATUS_ACTIVE,
+                    migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE,
                                       MIGRATION_STATUS_COMPLETED);
                     break;
                 }
@@ -985,7 +993,7 @@ static void *migration_thread(void *opaque)
         }
 
         if (qemu_file_get_error(s->file)) {
-            migrate_set_state(s, MIGRATION_STATUS_ACTIVE,
+            migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE,
                               MIGRATION_STATUS_FAILED);
             break;
         }
-- 
1.8.3.1