[Qemu-devel] [PATCH v3] migration/postcopy: use mis->bh instead of allocating a QEMUBH

[Wei Yang]

For migration incoming side, it either quit in precopy or postcopy. It
is safe to use the mis->bh for both instead of allocating a dedicated
QEMUBH for postcopy.

Signed-off-by: Wei Yang <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>

---
v3: rebase on latest upstream
v2: fix a typo in change log
---
 migration/savevm.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index 621b6c0465..9bf9d2e5fe 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1867,16 +1867,10 @@ static int 
loadvm_postcopy_handle_listen(MigrationIncomingState *mis)
     return 0;
 }
 
-
-typedef struct {
-    QEMUBH *bh;
-} HandleRunBhData;
-
 static void loadvm_postcopy_handle_run_bh(void *opaque)
 {
     Error *local_err = NULL;
-    HandleRunBhData *data = opaque;
-    MigrationIncomingState *mis = migration_incoming_get_current();
+    MigrationIncomingState *mis = opaque;
 
     /* TODO we should move all of this lot into postcopy_ram.c or a shared code
      * in migration.c
@@ -1908,15 +1902,13 @@ static void loadvm_postcopy_handle_run_bh(void *opaque)
         runstate_set(RUN_STATE_PAUSED);
     }
 
-    qemu_bh_delete(data->bh);
-    g_free(data);
+    qemu_bh_delete(mis->bh);
 }
 
 /* After all discards we can start running and asking for pages */
 static int loadvm_postcopy_handle_run(MigrationIncomingState *mis)
 {
     PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_RUNNING);
-    HandleRunBhData *data;
 
     trace_loadvm_postcopy_handle_run();
     if (ps != POSTCOPY_INCOMING_LISTENING) {
@@ -1924,9 +1916,8 @@ static int 
loadvm_postcopy_handle_run(MigrationIncomingState *mis)
         return -1;
     }
 
-    data = g_new(HandleRunBhData, 1);
-    data->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, data);
-    qemu_bh_schedule(data->bh);
+    mis->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, mis);
+    qemu_bh_schedule(mis->bh);
 
     /* We need to finish reading the stream from the package
      * and also stop reading anything more from the stream that loaded the
-- 
2.17.1