[Qemu-devel] [RFCPATCH08/20] replay: make safe vmstop at record/replay

[Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>]

From: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>

This patch disables bdrv flush/drain in record/replay mode.
When block request is in the replay queue it cannot be processed
with drain/flush until it is found in the log.
Therefore vm should just stop leaving unfinished operations
in the queue.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
---
 cpus.c             |    7 ++++---
 migration/savevm.c |    4 ++--
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/cpus.c b/cpus.c
index 114c29b..c728f3a 100644
--- a/cpus.c
+++ b/cpus.c
@@ -942,9 +942,10 @@ static int do_vm_stop(RunState state)
         qapi_event_send_stop(&error_abort);
     }
 
-    bdrv_drain_all();
-    replay_disable_events();
-    ret = bdrv_flush_all();
+    if (!replay_events_enabled()) {
+        bdrv_drain_all();
+        ret = bdrv_flush_all();
+    }
 
     return ret;
 }
diff --git a/migration/savevm.c b/migration/savevm.c
index 20cebe1..41a13c0 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2143,8 +2143,8 @@ int save_snapshot(const char *name, Error **errp)
     AioContext *aio_context;
 
     if (!replay_can_snapshot()) {
-        monitor_printf(mon, "Record/replay does not allow making snapshot "
-                        "right now. Try once more later.\n");
+        error_report("Record/replay does not allow making snapshot "
+                     "right now. Try once more later.\n");
         return ret;
     }