[libvirt] [PATCH v2 4/7] qemu: Fix a race when computing migration downtime

Computing a total downtime during a migration requires us to store a time stamp when guest CPUs get stopped. The value (and all other statistics) is then transferred to the destination to compute the downtime. Because the stopped time stamp is stored by a STOP event handler while the statistics which will be sent over to the destination are copied synchronously within qemuMigrationWaitForCompletion. Depending on the timing of STOP and MIGRATION events, we may end up copying (and transferring) statistics without the stopped time stamp set. Let's make sure we always use the correct time stamp. https://bugzilla.redhat.com/show_bug.cgi?id=1282744 Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- Notes: Version 2: - no change src/qemu/qemu_migration.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index dec4fc9..da0fc18 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -4508,6 +4508,8 @@ qemuMigrationRun(virQEMUDriverPtr driver, priv->job.current->type = VIR_DOMAIN_JOB_FAILED; goto cleanup; } + if (priv->job.completed) + priv->job.completed->stopped = priv->job.current->stopped; ret = 0; -- 2.7.2