[Qemu-devel] [PATCH COLO-Frame v16 34/35] COLO: manage the status of buffer filters for PVM

[zhanghailiang]

Enable all buffer filters that added by COLO while
go into COLO process, and disable them while exit COLO.

Signed-off-by: zhanghailiang <address@hidden>
Cc: Jason Wang <address@hidden>
Cc: Yang Hongyang <address@hidden>
---
v16:
- Stop buffer filter while doing checkpoint and resume it after
  checkpoint.
v15:
- Re-implement colo_set_filter_status() based on COLOBufferFilters list.
- Fix the title of this patch
---
 migration/colo.c | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/migration/colo.c b/migration/colo.c
index 7a60bc1..6a9caa2 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -114,10 +114,22 @@ static void secondary_vm_do_failover(void)
     }
 }
 
+static void colo_set_filter_status(const char *status, Error **errp)
+{
+    struct COLOListNode *e, *next;
+    NetFilterState *nf;
+
+    QLIST_FOREACH_SAFE(e, &COLOBufferFilters, node, next) {
+        nf = e->opaque;
+        object_property_set_str(OBJECT(nf), status, "status", errp);
+    }
+}
+
 static void primary_vm_do_failover(void)
 {
     MigrationState *s = migrate_get_current();
     int old_state;
+    Error *local_err = NULL;
 
     migrate_set_state(&s->state, MIGRATION_STATUS_COLO,
                       MIGRATION_STATUS_COMPLETED);
@@ -141,6 +153,12 @@ static void primary_vm_do_failover(void)
                      old_state);
         return;
     }
+
+    colo_set_filter_status("off", &local_err);
+    if (local_err) {
+        error_report_err(local_err);
+    }
+
     /* Notify COLO thread that failover work is finished */
     qemu_sem_post(&s->colo_sem);
 }
@@ -299,7 +317,11 @@ static int colo_do_checkpoint_transaction(MigrationState 
*s,
     if (failover_request_is_active()) {
         goto out;
     }
-
+    /* Stop buffer filter and flush the buffered packets */
+    colo_set_filter_status("off", &local_err);
+    if (local_err) {
+        goto out;
+    }
     colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err);
     if (local_err) {
         goto out;
@@ -363,6 +385,10 @@ static int colo_do_checkpoint_transaction(MigrationState 
*s,
         qemu_thread_exit(0);
     }
 
+    colo_set_filter_status("on", &local_err);
+    if (local_err) {
+        goto out;
+    }
     ret = 0;
     /* Resume primary guest */
     qemu_mutex_lock_iothread();
@@ -432,6 +458,11 @@ static void colo_process_checkpoint(MigrationState *s)
 
     failover_init_state();
 
+    colo_set_filter_status("on", &local_err);
+    if (local_err) {
+        goto out;
+    }
+
     s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);
     if (!s->rp_state.from_dst_file) {
         error_report("Open QEMUFile from_dst_file failed");
-- 
1.8.3.1