vhost-user: return failure if backend crash when live migration

Live migration should be terminated if the vhost-user backend crashes
before the migration completes.

Specifically, since the vhost device will be stopped when VM is stopped
before the end of the live migration, in current implementation if the
backend crashes, vhost-user device set_status() won't return failure,
live migration won't perceive the disconnection between QEMU and the
backend.

When the VM is migrated to the destination, the inflight IO will be
resubmitted, and if the IO was completed out of order before, it will
cause IO error.

To fix this issue:
1. Add the return value to set_status() for VirtioDeviceClass.
  a. For the vhost-user device, return failure when the backend crashes.
  b. For other virtio devices, always return 0.
2. Return failure if vhost_dev_stop() failed for vhost-user device.

If QEMU loses connection with the vhost-user backend, virtio set_status()
can return failure to the upper layer, migration_completion() can handle
the error, terminate the live migration, and restore the VM, so that
inflight IO can be completed normally.

Signed-off-by: Haoqian He <haoqian.he@smartx.com>
Message-Id: <20250416024729.3289157-4-haoqian.he@smartx.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

26 files changed, 160 insertions, 109 deletions

diff --git a/backends/vhost-user.c b/backends/vhost-user.c
index 94274a6..4284532 100644
--- a/backends/vhost-user.c
+++ b/backends/vhost-user.c
@@ -97,30 +97,28 @@ err_host_notifiers:
     vhost_dev_disable_notifiers(&b->dev, b->vdev);
 }
 
-void
+int
 vhost_user_backend_stop(VhostUserBackend *b)
 {
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(b->vdev)));
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
-    int ret = 0;
+    int ret;
 
     if (!b->started) {
-        return;
+        return 0;
     }
 
-    vhost_dev_stop(&b->dev, b->vdev, true);
+    ret = vhost_dev_stop(&b->dev, b->vdev, true);
 
-    if (k->set_guest_notifiers) {
-        ret = k->set_guest_notifiers(qbus->parent,
-                                     b->dev.nvqs, false);
-        if (ret < 0) {
-            error_report("vhost guest notifier cleanup failed: %d", ret);
-        }
+    if (k->set_guest_notifiers &&
+        k->set_guest_notifiers(qbus->parent, b->dev.nvqs, false) < 0) {
+        error_report("vhost guest notifier cleanup failed: %d", ret);
+        return -1;
     }
-    assert(ret >= 0);
 
     vhost_dev_disable_notifiers(&b->dev, b->vdev);
     b->started = false;
+    return ret;
 }
 
 static void set_chardev(Object *obj, const char *value, Error **errp)
diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index 4bb5ed2..0eebbcd 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -204,7 +204,7 @@ err_host_notifiers:
     return ret;
 }
 
-static void vhost_user_blk_stop(VirtIODevice *vdev)
+static int vhost_user_blk_stop(VirtIODevice *vdev)
 {
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
@@ -212,26 +212,26 @@ static void vhost_user_blk_stop(VirtIODevice *vdev)
     int ret;
 
     if (!s->started_vu) {
-        return;
+        return 0;
     }
     s->started_vu = false;
 
     if (!k->set_guest_notifiers) {
-        return;
+        return 0;
     }
 
-    vhost_dev_stop(&s->dev, vdev, true);
+    ret = vhost_dev_stop(&s->dev, vdev, true);
 
-    ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
-    if (ret < 0) {
+    if (k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false) < 0) {
         error_report("vhost guest notifier cleanup failed: %d", ret);
-        return;
+        return -1;
     }
 
     vhost_dev_disable_notifiers(&s->dev, vdev);
+    return ret;
 }
 
-static void vhost_user_blk_set_status(VirtIODevice *vdev, uint8_t status)
+static int vhost_user_blk_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VHostUserBlk *s = VHOST_USER_BLK(vdev);
     bool should_start = virtio_device_should_start(vdev, status);
@@ -239,11 +239,11 @@ static void vhost_user_blk_set_status(VirtIODevice *vdev, uint8_t status)
     int ret;
 
     if (!s->connected) {
-        return;
+        return -1;
     }
 
     if (vhost_dev_is_started(&s->dev) == should_start) {
-        return;
+        return 0;
     }
 
     if (should_start) {
@@ -253,9 +253,12 @@ static void vhost_user_blk_set_status(VirtIODevice *vdev, uint8_t status)
             qemu_chr_fe_disconnect(&s->chardev);
         }
     } else {
-        vhost_user_blk_stop(vdev);
+        ret = vhost_user_blk_stop(vdev);
+        if (ret < 0) {
+            return ret;
+        }
     }
-
+    return 0;
 }
 
 static uint64_t vhost_user_blk_get_features(VirtIODevice *vdev,
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index ea948d1..9bab271 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -1270,7 +1270,7 @@ static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
     return features;
 }
 
-static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
+static int virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VirtIOBlock *s = VIRTIO_BLK(vdev);
 
@@ -1279,7 +1279,7 @@ static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
     }
 
     if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
-        return;
+        return 0;
     }
 
     /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send
@@ -1302,6 +1302,7 @@ static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
                                    virtio_vdev_has_feature(vdev,
                                                            VIRTIO_BLK_F_WCE));
     }
+    return 0;
 }
 
 static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f)
diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
index eb79f52..673c50f 100644
--- a/hw/char/virtio-serial-bus.c
+++ b/hw/char/virtio-serial-bus.c
@@ -622,7 +622,7 @@ static void guest_reset(VirtIOSerial *vser)
     }
 }
 
-static void set_status(VirtIODevice *vdev, uint8_t status)
+static int set_status(VirtIODevice *vdev, uint8_t status)
 {
     VirtIOSerial *vser;
     VirtIOSerialPort *port;
@@ -650,6 +650,7 @@ static void set_status(VirtIODevice *vdev, uint8_t status)
             vsc->enable_backend(port, vdev->vm_running);
         }
     }
+    return 0;
 }
 
 static void vser_reset(VirtIODevice *vdev)
diff --git a/hw/display/vhost-user-gpu.c b/hw/display/vhost-user-gpu.c
index 43d4c08..9fc6bbc 100644
--- a/hw/display/vhost-user-gpu.c
+++ b/hw/display/vhost-user-gpu.c
@@ -516,7 +516,7 @@ vhost_user_gpu_set_config(VirtIODevice *vdev,
     }
 }
 
-static void
+static int
 vhost_user_gpu_set_status(VirtIODevice *vdev, uint8_t val)
 {
     VhostUserGPU *g = VHOST_USER_GPU(vdev);
@@ -525,18 +525,24 @@ vhost_user_gpu_set_status(VirtIODevice *vdev, uint8_t val)
     if (val & VIRTIO_CONFIG_S_DRIVER_OK && vdev->vm_running) {
         if (!vhost_user_gpu_do_set_socket(g, &err)) {
             error_report_err(err);
-            return;
+            return 0;
         }
         vhost_user_backend_start(g->vhost);
     } else {
+        int ret;
+
         /* unblock any wait and stop processing */
         if (g->vhost_gpu_fd != -1) {
             vhost_user_gpu_update_blocked(g, true);
             qemu_chr_fe_deinit(&g->vhost_chr, true);
             g->vhost_gpu_fd = -1;
         }
-        vhost_user_backend_stop(g->vhost);
+        ret = vhost_user_backend_stop(g->vhost);
+        if (ret < 0) {
+            return ret;
+        }
     }
+    return 0;
 }
 
 static bool
diff --git a/hw/input/virtio-input.c b/hw/input/virtio-input.c
index 1818cbd..a3f554f 100644
--- a/hw/input/virtio-input.c
+++ b/hw/input/virtio-input.c
@@ -189,7 +189,7 @@ static uint64_t virtio_input_get_features(VirtIODevice *vdev, uint64_t f,
     return f;
 }
 
-static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val)
+static int virtio_input_set_status(VirtIODevice *vdev, uint8_t val)
 {
     VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
     VirtIOInput *vinput = VIRTIO_INPUT(vdev);
@@ -202,6 +202,7 @@ static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val)
             }
         }
     }
+    return 0;
 }
 
 static void virtio_input_reset(VirtIODevice *vdev)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 2de037c..221252e 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -382,7 +382,7 @@ static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq)
     }
 }
 
-static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
+static int virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
 {
     VirtIONet *n = VIRTIO_NET(vdev);
     VirtIONetQueue *q;
@@ -437,6 +437,7 @@ static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
             }
         }
     }
+    return 0;
 }
 
 static void virtio_net_set_link_status(NetClientState *nc)
diff --git a/hw/scsi/vhost-scsi-common.c b/hw/scsi/vhost-scsi-common.c
index 4c86370..43525ba 100644
--- a/hw/scsi/vhost-scsi-common.c
+++ b/hw/scsi/vhost-scsi-common.c
@@ -101,24 +101,25 @@ err_host_notifiers:
     return ret;
 }
 
-void vhost_scsi_common_stop(VHostSCSICommon *vsc)
+int vhost_scsi_common_stop(VHostSCSICommon *vsc)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
     int ret = 0;
 
-    vhost_dev_stop(&vsc->dev, vdev, true);
+    ret = vhost_dev_stop(&vsc->dev, vdev, true);
 
     if (k->set_guest_notifiers) {
-        ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
-        if (ret < 0) {
-                error_report("vhost guest notifier cleanup failed: %d", ret);
+        int r = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
+        if (r < 0) {
+            error_report("vhost guest notifier cleanup failed: %d", ret);
+            return r;
         }
     }
-    assert(ret >= 0);
 
     vhost_dev_disable_notifiers(&vsc->dev, vdev);
+    return ret;
 }
 
 uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index 10fde8e..dd4250e 100644
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -114,7 +114,7 @@ static void vhost_scsi_stop(VHostSCSI *s)
     vhost_scsi_common_stop(vsc);
 }
 
-static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val)
+static int vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val)
 {
     VHostSCSI *s = VHOST_SCSI(vdev);
     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
@@ -125,7 +125,7 @@ static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val)
     }
 
     if (vhost_dev_is_started(&vsc->dev) == start) {
-        return;
+        return 0;
     }
 
     if (start) {
@@ -139,6 +139,7 @@ static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val)
     } else {
         vhost_scsi_stop(s);
     }
+    return 0;
 }
 
 static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c
index 8298e8c..25f2d89 100644
--- a/hw/scsi/vhost-user-scsi.c
+++ b/hw/scsi/vhost-user-scsi.c
@@ -52,19 +52,19 @@ static int vhost_user_scsi_start(VHostUserSCSI *s, Error **errp)
     return ret;
 }
 
-static void vhost_user_scsi_stop(VHostUserSCSI *s)
+static int vhost_user_scsi_stop(VHostUserSCSI *s)
 {
     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
 
     if (!s->started_vu) {
-        return;
+        return 0;
     }
     s->started_vu = false;
 
-    vhost_scsi_common_stop(vsc);
+    return vhost_scsi_common_stop(vsc);
 }
 
-static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status)
+static int vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VHostUserSCSI *s = (VHostUserSCSI *)vdev;
     DeviceState *dev = DEVICE(vdev);
@@ -75,11 +75,11 @@ static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status)
     int ret;
 
     if (!s->connected) {
-        return;
+        return -1;
     }
 
     if (vhost_dev_is_started(&vsc->dev) == should_start) {
-        return;
+        return 0;
     }
 
     if (should_start) {
@@ -91,8 +91,12 @@ static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status)
             qemu_chr_fe_disconnect(&vs->conf.chardev);
         }
     } else {
-        vhost_user_scsi_stop(s);
+        ret = vhost_user_scsi_stop(s);
+        if (ret) {
+            return ret;
+        }
     }
+    return 0;
 }
 
 static void vhost_user_scsi_handle_output(VirtIODevice *vdev, VirtQueue *vq)
diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
index dd8837c..d1da40a 100644
--- a/hw/virtio/vdpa-dev.c
+++ b/hw/virtio/vdpa-dev.c
@@ -312,7 +312,7 @@ static void vhost_vdpa_device_stop(VirtIODevice *vdev)
     vhost_dev_disable_notifiers(&s->dev, vdev);
 }
 
-static void vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
+static int vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
     bool should_start = virtio_device_started(vdev, status);
@@ -324,7 +324,7 @@ static void vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
     }
 
     if (s->started == should_start) {
-        return;
+        return 0;
     }
 
     if (should_start) {
@@ -335,6 +335,7 @@ static void vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
     } else {
         vhost_vdpa_device_stop(vdev);
     }
+    return 0;
 }
 
 static const Property vhost_vdpa_device_properties[] = {
diff --git a/hw/virtio/vhost-user-base.c b/hw/virtio/vhost-user-base.c
index 7714332..ff67a02 100644
--- a/hw/virtio/vhost-user-base.c
+++ b/hw/virtio/vhost-user-base.c
@@ -66,7 +66,7 @@ err_host_notifiers:
     vhost_dev_disable_notifiers(&vub->vhost_dev, vdev);
 }
 
-static void vub_stop(VirtIODevice *vdev)
+static int vub_stop(VirtIODevice *vdev)
 {
     VHostUserBase *vub = VHOST_USER_BASE(vdev);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
@@ -74,34 +74,39 @@ static void vub_stop(VirtIODevice *vdev)
     int ret;
 
     if (!k->set_guest_notifiers) {
-        return;
+        return 0;
     }
 
-    vhost_dev_stop(&vub->vhost_dev, vdev, true);
+    ret = vhost_dev_stop(&vub->vhost_dev, vdev, true);
 
-    ret = k->set_guest_notifiers(qbus->parent, vub->vhost_dev.nvqs, false);
-    if (ret < 0) {
+    if (k->set_guest_notifiers(qbus->parent, vub->vhost_dev.nvqs, false) < 0) {
         error_report("vhost guest notifier cleanup failed: %d", ret);
-        return;
+        return -1;
     }
 
     vhost_dev_disable_notifiers(&vub->vhost_dev, vdev);
+    return ret;
 }
 
-static void vub_set_status(VirtIODevice *vdev, uint8_t status)
+static int vub_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VHostUserBase *vub = VHOST_USER_BASE(vdev);
     bool should_start = virtio_device_should_start(vdev, status);
 
     if (vhost_dev_is_started(&vub->vhost_dev) == should_start) {
-        return;
+        return 0;
     }
 
     if (should_start) {
         vub_start(vdev);
     } else {
-        vub_stop(vdev);
+        int ret;
+        ret = vub_stop(vdev);
+        if (ret < 0) {
+            return ret;
+        }
     }
+    return 0;
 }
 
 /*
diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c
index f6d1fc8..e77c69e 100644
--- a/hw/virtio/vhost-user-fs.c
+++ b/hw/virtio/vhost-user-fs.c
@@ -100,7 +100,7 @@ err_host_notifiers:
     vhost_dev_disable_notifiers(&fs->vhost_dev, vdev);
 }
 
-static void vuf_stop(VirtIODevice *vdev)
+static int vuf_stop(VirtIODevice *vdev)
 {
     VHostUserFS *fs = VHOST_USER_FS(vdev);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
@@ -108,34 +108,39 @@ static void vuf_stop(VirtIODevice *vdev)
     int ret;
 
     if (!k->set_guest_notifiers) {
-        return;
+        return 0;
     }
 
-    vhost_dev_stop(&fs->vhost_dev, vdev, true);
+    ret = vhost_dev_stop(&fs->vhost_dev, vdev, true);
 
-    ret = k->set_guest_notifiers(qbus->parent, fs->vhost_dev.nvqs, false);
-    if (ret < 0) {
+    if (k->set_guest_notifiers(qbus->parent, fs->vhost_dev.nvqs, false) < 0) {
         error_report("vhost guest notifier cleanup failed: %d", ret);
-        return;
+        return -1;
     }
 
     vhost_dev_disable_notifiers(&fs->vhost_dev, vdev);
+    return ret;
 }
 
-static void vuf_set_status(VirtIODevice *vdev, uint8_t status)
+static int vuf_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VHostUserFS *fs = VHOST_USER_FS(vdev);
     bool should_start = virtio_device_should_start(vdev, status);
 
     if (vhost_dev_is_started(&fs->vhost_dev) == should_start) {
-        return;
+        return 0;
     }
 
     if (should_start) {
         vuf_start(vdev);
     } else {
-        vuf_stop(vdev);
+        int ret;
+        ret = vuf_stop(vdev);
+        if (ret < 0) {
+            return ret;
+        }
     }
+    return 0;
 }
 
 static uint64_t vuf_get_features(VirtIODevice *vdev,
diff --git a/hw/virtio/vhost-user-scmi.c b/hw/virtio/vhost-user-scmi.c
index 7a0f622..f9264c4 100644
--- a/hw/virtio/vhost-user-scmi.c
+++ b/hw/virtio/vhost-user-scmi.c
@@ -83,7 +83,7 @@ err_host_notifiers:
     return ret;
 }
 
-static void vu_scmi_stop(VirtIODevice *vdev)
+static int vu_scmi_stop(VirtIODevice *vdev)
 {
     VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
@@ -93,41 +93,46 @@ static void vu_scmi_stop(VirtIODevice *vdev)
 
     /* vhost_dev_is_started() check in the callers is not fully reliable. */
     if (!scmi->started_vu) {
-        return;
+        return 0;
     }
     scmi->started_vu = false;
 
     if (!k->set_guest_notifiers) {
-        return;
+        return 0;
     }
 
-    vhost_dev_stop(vhost_dev, vdev, true);
+    ret = vhost_dev_stop(vhost_dev, vdev, true);
 
-    ret = k->set_guest_notifiers(qbus->parent, vhost_dev->nvqs, false);
-    if (ret < 0) {
+    if (k->set_guest_notifiers(qbus->parent, vhost_dev->nvqs, false) < 0) {
         error_report("vhost guest notifier cleanup failed: %d", ret);
-        return;
+        return -1;
     }
     vhost_dev_disable_notifiers(vhost_dev, vdev);
+    return ret;
 }
 
-static void vu_scmi_set_status(VirtIODevice *vdev, uint8_t status)
+static int vu_scmi_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
     bool should_start = virtio_device_should_start(vdev, status);
 
     if (!scmi->connected) {
-        return;
+        return -1;
     }
     if (vhost_dev_is_started(&scmi->vhost_dev) == should_start) {
-        return;
+        return 0;
     }
 
     if (should_start) {
         vu_scmi_start(vdev);
     } else {
-        vu_scmi_stop(vdev);
+        int ret;
+        ret = vu_scmi_stop(vdev);
+        if (ret < 0) {
+            return ret;
+        }
     }
+    return 0;
 }
 
 static uint64_t vu_scmi_get_features(VirtIODevice *vdev, uint64_t features,
diff --git a/hw/virtio/vhost-user-vsock.c b/hw/virtio/vhost-user-vsock.c
index 2776792..993c287 100644
--- a/hw/virtio/vhost-user-vsock.c
+++ b/hw/virtio/vhost-user-vsock.c
@@ -54,23 +54,28 @@ const VhostDevConfigOps vsock_ops = {
     .vhost_dev_config_notifier = vuv_handle_config_change,
 };
 
-static void vuv_set_status(VirtIODevice *vdev, uint8_t status)
+static int vuv_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
     bool should_start = virtio_device_should_start(vdev, status);
+    int ret;
 
     if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) {
-        return;
+        return 0;
     }
 
     if (should_start) {
-        int ret = vhost_vsock_common_start(vdev);
+        ret = vhost_vsock_common_start(vdev);
         if (ret < 0) {
-            return;
+            return ret;
         }
     } else {
-        vhost_vsock_common_stop(vdev);
+        ret = vhost_vsock_common_stop(vdev);
+        if (ret < 0) {
+            return ret;
+        }
     }
+    return 0;
 }
 
 static uint64_t vuv_get_features(VirtIODevice *vdev,
diff --git a/hw/virtio/vhost-vsock-common.c b/hw/virtio/vhost-vsock-common.c
index 4b4fbb4..c6c44d8 100644
--- a/hw/virtio/vhost-vsock-common.c
+++ b/hw/virtio/vhost-vsock-common.c
@@ -95,7 +95,7 @@ err_host_notifiers:
     return ret;
 }
 
-void vhost_vsock_common_stop(VirtIODevice *vdev)
+int vhost_vsock_common_stop(VirtIODevice *vdev)
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
@@ -103,18 +103,18 @@ void vhost_vsock_common_stop(VirtIODevice *vdev)
     int ret;
 
     if (!k->set_guest_notifiers) {
-        return;
+        return 0;
     }
 
-    vhost_dev_stop(&vvc->vhost_dev, vdev, true);
+    ret = vhost_dev_stop(&vvc->vhost_dev, vdev, true);
 
-    ret = k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, false);
-    if (ret < 0) {
+    if (k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, false) < 0) {
         error_report("vhost guest notifier cleanup failed: %d", ret);
-        return;
+        return -1;
     }
 
     vhost_dev_disable_notifiers(&vvc->vhost_dev, vdev);
+    return ret;
 }
 
 
diff --git a/hw/virtio/vhost-vsock.c b/hw/virtio/vhost-vsock.c
index b73dc72..6e40888 100644
--- a/hw/virtio/vhost-vsock.c
+++ b/hw/virtio/vhost-vsock.c
@@ -67,37 +67,38 @@ static int vhost_vsock_set_running(VirtIODevice *vdev, int start)
 }
 
 
-static void vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status)
+static int vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
     bool should_start = virtio_device_should_start(vdev, status);
     int ret;
 
     if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) {
-        return;
+        return 0;
     }
 
     if (should_start) {
         ret = vhost_vsock_common_start(vdev);
         if (ret < 0) {
-            return;
+            return 0;
         }
 
         ret = vhost_vsock_set_running(vdev, 1);
         if (ret < 0) {
             vhost_vsock_common_stop(vdev);
             error_report("Error starting vhost vsock: %d", -ret);
-            return;
+            return 0;
         }
     } else {
         ret = vhost_vsock_set_running(vdev, 0);
         if (ret < 0) {
             error_report("vhost vsock set running failed: %d", ret);
-            return;
+            return 0;
         }
 
         vhost_vsock_common_stop(vdev);
     }
+    return 0;
 }
 
 static uint64_t vhost_vsock_get_features(VirtIODevice *vdev,
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 91510ec..db787d0 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -958,7 +958,7 @@ static void virtio_balloon_device_reset(VirtIODevice *vdev)
     s->poison_val = 0;
 }
 
-static void virtio_balloon_set_status(VirtIODevice *vdev, uint8_t status)
+static int virtio_balloon_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VirtIOBalloon *s = VIRTIO_BALLOON(vdev);
 
@@ -988,6 +988,7 @@ static void virtio_balloon_set_status(VirtIODevice *vdev, uint8_t status)
             qemu_mutex_unlock(&s->free_page_lock);
         }
     }
+    return 0;
 }
 
 static ResettableState *virtio_balloon_get_reset_state(Object *obj)
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
index e24d691..517f208 100644
--- a/hw/virtio/virtio-crypto.c
+++ b/hw/virtio/virtio-crypto.c
@@ -1197,11 +1197,12 @@ static void virtio_crypto_vhost_status(VirtIOCrypto *c, uint8_t status)
     }
 }
 
-static void virtio_crypto_set_status(VirtIODevice *vdev, uint8_t status)
+static int virtio_crypto_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
 
     virtio_crypto_vhost_status(vcrypto, status);
+    return 0;
 }
 
 static void virtio_crypto_guest_notifier_mask(VirtIODevice *vdev, int idx,
diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 5406098..3500f1b 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -1522,9 +1522,10 @@ static void virtio_iommu_device_reset_exit(Object *obj, ResetType type)
                                    NULL, NULL, virtio_iommu_put_endpoint);
 }
 
-static void virtio_iommu_set_status(VirtIODevice *vdev, uint8_t status)
+static int virtio_iommu_set_status(VirtIODevice *vdev, uint8_t status)
 {
     trace_virtio_iommu_device_status(status);
+    return 0;
 }
 
 static void virtio_iommu_instance_init(Object *obj)
diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index dcb3c71..3df5d25 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -159,17 +159,18 @@ static void check_rate_limit(void *opaque)
     vrng->activate_timer = true;
 }
 
-static void virtio_rng_set_status(VirtIODevice *vdev, uint8_t status)
+static int virtio_rng_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VirtIORNG *vrng = VIRTIO_RNG(vdev);
 
     if (!vdev->vm_running) {
-        return;
+        return 0;
     }
     vdev->status = status;
 
     /* Something changed, try to process buffers */
     virtio_rng_process(vrng);
+    return 0;
 }
 
 static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index e3b6252..1b55d8d 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2221,12 +2221,12 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t val)
 {
     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     trace_virtio_set_status(vdev, val);
+    int ret = 0;
 
     if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
         if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) &&
             val & VIRTIO_CONFIG_S_FEATURES_OK) {
-            int ret = virtio_validate_features(vdev);
-
+            ret = virtio_validate_features(vdev);
             if (ret) {
                 return ret;
             }
@@ -2239,11 +2239,15 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t val)
     }
 
     if (k->set_status) {
-        k->set_status(vdev, val);
+        ret = k->set_status(vdev, val);
+        if (ret) {
+            qemu_log("set %s status to %d failed, old status: %d\n",
+                     vdev->name, val, vdev->status);
+        }
     }
     vdev->status = val;
 
-    return 0;
+    return ret;
 }
 
 static enum virtio_device_endian virtio_default_endian(void)
@@ -3419,7 +3423,7 @@ void virtio_cleanup(VirtIODevice *vdev)
     qemu_del_vm_change_state_handler(vdev->vmstate);
 }
 
-static void virtio_vmstate_change(void *opaque, bool running, RunState state)
+static int virtio_vmstate_change(void *opaque, bool running, RunState state)
 {
     VirtIODevice *vdev = opaque;
     BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
@@ -3436,8 +3440,12 @@ static void virtio_vmstate_change(void *opaque, bool running, RunState state)
     }
 
     if (!backend_run) {
-        virtio_set_status(vdev, vdev->status);
+        int ret = virtio_set_status(vdev, vdev->status);
+        if (ret) {
+            return ret;
+        }
     }
+    return 0;
 }
 
 void virtio_instance_init_common(Object *proxy_obj, void *data,
@@ -3489,7 +3497,7 @@ void virtio_init(VirtIODevice *vdev, uint16_t device_id, size_t config_size)
         vdev->config = NULL;
     }
     vdev->vmstate = qdev_add_vm_change_state_handler(DEVICE(vdev),
-            virtio_vmstate_change, NULL, vdev);
+            NULL, virtio_vmstate_change, vdev);
     vdev->device_endian = virtio_default_endian();
     vdev->use_guest_notifier_mask = true;
 }
diff --git a/include/hw/virtio/vhost-scsi-common.h b/include/hw/virtio/vhost-scsi-common.h
index c5d2c09..d54d9c9 100644
--- a/include/hw/virtio/vhost-scsi-common.h
+++ b/include/hw/virtio/vhost-scsi-common.h
@@ -40,7 +40,7 @@ struct VHostSCSICommon {
 };
 
 int vhost_scsi_common_start(VHostSCSICommon *vsc, Error **errp);
-void vhost_scsi_common_stop(VHostSCSICommon *vsc);
+int vhost_scsi_common_stop(VHostSCSICommon *vsc);
 char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
                                         DeviceState *dev);
 void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config);
diff --git a/include/hw/virtio/vhost-vsock-common.h b/include/hw/virtio/vhost-vsock-common.h
index 75a74e8..01bf606 100644
--- a/include/hw/virtio/vhost-vsock-common.h
+++ b/include/hw/virtio/vhost-vsock-common.h
@@ -42,7 +42,7 @@ struct VHostVSockCommon {
 };
 
 int vhost_vsock_common_start(VirtIODevice *vdev);
-void vhost_vsock_common_stop(VirtIODevice *vdev);
+int vhost_vsock_common_stop(VirtIODevice *vdev);
 int vhost_vsock_common_pre_save(void *opaque);
 int vhost_vsock_common_post_load(void *opaque, int version_id);
 void vhost_vsock_common_realize(VirtIODevice *vdev);
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 7e0c471..214d4a7 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -186,7 +186,7 @@ struct VirtioDeviceClass {
     void (*get_config)(VirtIODevice *vdev, uint8_t *config);
     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
     void (*reset)(VirtIODevice *vdev);
-    void (*set_status)(VirtIODevice *vdev, uint8_t val);
+    int (*set_status)(VirtIODevice *vdev, uint8_t val);
     /* Device must validate queue_index.  */
     void (*queue_reset)(VirtIODevice *vdev, uint32_t queue_index);
     /* Device must validate queue_index.  */
diff --git a/include/system/vhost-user-backend.h b/include/system/vhost-user-backend.h
index 5ed953c..5634ebd 100644
--- a/include/system/vhost-user-backend.h
+++ b/include/system/vhost-user-backend.h
@@ -43,6 +43,6 @@ struct VhostUserBackend {
 int vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev,
                                 unsigned nvqs, Error **errp);
 void vhost_user_backend_start(VhostUserBackend *b);
-void vhost_user_backend_stop(VhostUserBackend *b);
+int vhost_user_backend_stop(VhostUserBackend *b);
 
 #endif