failover: Silence warning messages during qtest

virtio-net-failover test tries several device combinations that produces
some expected warnings.
These warning can be confusing, so we disable them during the qtest
sequence.

Reported-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20211220145314.390697-1-lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
[thuth: Fix memory leak by using error_free()]
Signed-off-by: Thomas Huth <thuth@redhat.com>

hw/net/virtio-net.c

@@ -44,6 +44,7 @@
 #include "hw/pci/pci.h"
 #include "net_rx_pkt.h"
 #include "hw/virtio/vhost.h"
+#include "sysemu/qtest.h"
 
 #define VIRTIO_NET_VM_VERSION    11
 
@@ -926,7 +927,11 @@ static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
         qatomic_set(&n->failover_primary_hidden, false);
         failover_add_primary(n, &err);
         if (err) {
-            warn_report_err(err);
+            if (!qtest_enabled()) {
+                warn_report_err(err);
+            } else {
+                error_free(err);
+            }
         }
     }
 }

migration/migration.c

@@ -60,6 +60,7 @@
 #include "qemu/yank.h"
 #include "sysemu/cpus.h"
 #include "yank_functions.h"
+#include "sysemu/qtest.h"
 
 #define MAX_THROTTLE  (128 << 20)      /* Migration transfer speed throttling */
 
@@ -3766,7 +3767,8 @@ static void qemu_savevm_wait_unplug(MigrationState *s, int old_state,
             while (timeout-- && qemu_savevm_state_guest_unplug_pending()) {
                 qemu_sem_timedwait(&s->wait_unplug_sem, 250);
             }
-            if (qemu_savevm_state_guest_unplug_pending()) {
+            if (qemu_savevm_state_guest_unplug_pending() &&
+                !qtest_enabled()) {
                 warn_report("migration: partially unplugged device on "
                             "failure");
             }