[Qemu-devel] [PATCH 04/15] COLO: integrate colo compare with colo frame

[zhanghailiang]

For COLO FT, both the PVM and SVM run at the same time,
only sync the state while it needs.

So here, let SVM runs while not doing checkpoint,
Besides, change DEFAULT_MIGRATE_X_CHECKPOINT_DELAY to 200*100.

Cc: Jason Wang <address@hidden>
Signed-off-by: zhanghailiang <address@hidden>
---
 migration/colo.c      | 25 +++++++++++++++++++++++++
 migration/migration.c |  2 +-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/migration/colo.c b/migration/colo.c
index 712308e..fb8d8fd 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -19,8 +19,11 @@
 #include "qemu/error-report.h"
 #include "qapi/error.h"
 #include "migration/failover.h"
+#include "net/colo-compare.h"
+#include "net/colo.h"
 
 static bool vmstate_loading;
+static Notifier packets_compare_notifier;
 
 #define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
 
@@ -263,6 +266,7 @@ static int colo_do_checkpoint_transaction(MigrationState *s,
     if (local_err) {
         goto out;
     }
+
     /* Reset channel-buffer directly */
     qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
     bioc->usage = 0;
@@ -283,6 +287,11 @@ static int colo_do_checkpoint_transaction(MigrationState 
*s,
         goto out;
     }
 
+    colo_notify_compares_event(NULL, COLO_CHECKPOINT, &local_err);
+    if (local_err) {
+        goto out;
+    }
+
     /* Disable block migration */
     s->params.blk = 0;
     s->params.shared = 0;
@@ -341,6 +350,11 @@ out:
     return ret;
 }
 
+static void colo_compare_notify_checkpoint(Notifier *notifier, void *data)
+{
+    colo_checkpoint_notify(data);
+}
+
 static void colo_process_checkpoint(MigrationState *s)
 {
     QIOChannelBuffer *bioc;
@@ -357,6 +371,9 @@ static void colo_process_checkpoint(MigrationState *s)
         goto out;
     }
 
+    packets_compare_notifier.notify = colo_compare_notify_checkpoint;
+    colo_compare_register_notifier(&packets_compare_notifier);
+
     /*
      * Wait for Secondary finish loading VM states and enter COLO
      * restore.
@@ -402,6 +419,7 @@ out:
         qemu_fclose(fb);
     }
 
+    colo_compare_unregister_notifier(&packets_compare_notifier);
     timer_del(s->colo_delay_timer);
 
     /* Hope this not to be too long to wait here */
@@ -518,6 +536,11 @@ void *colo_process_incoming_thread(void *opaque)
             goto out;
         }
 
+        qemu_mutex_lock_iothread();
+        vm_stop_force_state(RUN_STATE_COLO);
+        trace_colo_vm_state_change("run", "stop");
+        qemu_mutex_unlock_iothread();
+
         /* FIXME: This is unnecessary for periodic checkpoint mode */
         colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
                      &local_err);
@@ -571,6 +594,8 @@ void *colo_process_incoming_thread(void *opaque)
         }
 
         vmstate_loading = false;
+        vm_start();
+        trace_colo_vm_state_change("stop", "run");
         qemu_mutex_unlock_iothread();
 
         if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
diff --git a/migration/migration.c b/migration/migration.c
index c6ae69d..2339be7 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -66,7 +66,7 @@
 /* The delay time (in ms) between two COLO checkpoints
  * Note: Please change this default value to 10000 when we support hybrid mode.
  */
-#define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200
+#define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100)
 
 static NotifierList migration_state_notifiers =
     NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
-- 
1.8.3.1