[libvirt] [PATCH] qemu: properly quit migration with abort_on_error

[Martin Kletzander]

When EIO comes to qemu while it's replying to
qemuMigrationUpdateJobStatus(), qemu blocks, the migration of RAM can
complete in the meantime, and when qemu unblocks, it sends us
BLOCK_IO_ERROR plus migrations "status": "complete".  Even though we
act upon the BLOCK_IO_ERROR by setting the proper state of the domain,
the call still waits for the proper reply on monitor for query_migrate
and after it gets it, it checks that migration is completed and the
migration is finished.  This is what abort_on_error flag was meant for
(we can migrate with these errors, but this flag must inhibit such
behaviour).  Changing the order of the steps guarantees the flag works
properly.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1045833

Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
---
 src/qemu/qemu_migration.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 593d2d3..3d005a0 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -1812,15 +1812,15 @@ qemuMigrationWaitForCompletion(virQEMUDriverPtr driver, virDomainObjPtr vm,
         /* Poll every 50ms for progress & to allow cancellation */
         struct timespec ts = { .tv_sec = 0, .tv_nsec = 50 * 1000 * 1000ull };

+        if (qemuMigrationUpdateJobStatus(driver, vm, job, asyncJob) < 0)
+            goto cleanup;
+
         /* cancel migration if disk I/O error is emitted while migrating */
         if (abort_on_error &&
             virDomainObjGetState(vm, &pauseReason) == VIR_DOMAIN_PAUSED &&
             pauseReason == VIR_DOMAIN_PAUSED_IOERROR)
             goto cancel;

-        if (qemuMigrationUpdateJobStatus(driver, vm, job, asyncJob) < 0)
-            goto cleanup;
-
         if (dconn && virConnectIsAlive(dconn) <= 0) {
             virReportError(VIR_ERR_OPERATION_FAILED, "%s",
                            _("Lost connection to destination host"));
-- 
1.9.2