vfio/container: fails mdev hotplug if add migration blocker failed

It's aggressive to abort a running QEMU process when hotplug a mdev
and it fails migration blocker adding.

Fix by just failing mdev hotplug itself.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250623102235.94877-3-zhenzhong.duan@intel.com
[ clg: Changed test on value returned by migrate_add_blocker_modes() ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 2853f6f08b5d3f199b7f2c22de884ec6b57279ce..3e13feaa74c30e8d7f5a0978e15824cecbf6d674 100644 (file)
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -992,12 +992,16 @@ static bool vfio_legacy_attach_device(const char *name, VFIODevice *vbasedev,
     if (vbasedev->mdev) {
         error_setg(&vbasedev->cpr.mdev_blocker,
                    "CPR does not support vfio mdev %s", vbasedev->name);
-        migrate_add_blocker_modes(&vbasedev->cpr.mdev_blocker, &error_fatal,
-                                  MIG_MODE_CPR_TRANSFER, -1);
+        if (migrate_add_blocker_modes(&vbasedev->cpr.mdev_blocker, errp,
+                                      MIG_MODE_CPR_TRANSFER, -1) < 0) {
+            goto hiod_unref_exit;
+        }
     }
 
     return true;
 
+hiod_unref_exit:
+    object_unref(vbasedev->hiod);
 device_put_exit:
     vfio_device_put(vbasedev);
 group_put_exit: