[PATCH v5 4/6] vhost-user-blk: make inflight-migration prop mutable

When migrating from a QEMU version that supports inflight-migration to
an older one that does not, there is no way to disable the feature at
runtime — the VM must be stopped and reconfigured. This is impractical
in production environments.

Make the inflight-migration property mutable after device realization
so it can be toggled via qom-set without restarting the VM.

Acked-by: Raphael Norwitz <[email protected]>
Signed-off-by: Alexandr Moshkov <[email protected]>
---
 hw/block/vhost-user-blk.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index e3b873af7c..650c004bde 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -619,6 +619,8 @@ static const VMStateDescription vmstate_vhost_user_blk = {
     }
 };
 
+static PropertyInfo vhost_user_blk_inflight_migration_prop;
+
 static const Property vhost_user_blk_properties[] = {
     DEFINE_PROP_CHR("chardev", VHostUserBlk, chardev),
     DEFINE_PROP_UINT16("num-queues", VHostUserBlk, num_queues,
@@ -632,8 +634,9 @@ static const Property vhost_user_blk_properties[] = {
                       VIRTIO_BLK_F_WRITE_ZEROES, true),
     DEFINE_PROP_BOOL("skip-get-vring-base-on-force-shutdown", VHostUserBlk,
                      skip_get_vring_base_on_force_shutdown, false),
-    DEFINE_PROP_BOOL("inflight-migration", VHostUserBlk,
-                     inflight_migration, false),
+    DEFINE_PROP("inflight-migration", VHostUserBlk, inflight_migration,
+                vhost_user_blk_inflight_migration_prop, bool,
+                .set_default = true, .defval.u = false),
 };
 
 static void vhost_user_blk_class_init(ObjectClass *klass, const void *data)
@@ -665,6 +668,9 @@ static const TypeInfo vhost_user_blk_info = {
 
 static void virtio_register_types(void)
 {
+    vhost_user_blk_inflight_migration_prop = qdev_prop_bool;
+    vhost_user_blk_inflight_migration_prop.realized_set_allowed = true;
+
     type_register_static(&vhost_user_blk_info);
 }
 
-- 
2.34.1