virtio: remove the function pointer.

This remove the function pointer in VirtIODevice, and use only
VirtioDeviceClass function pointer.

Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Message-id: 1366791683-5350-5-git-send-email-fred.konrad@greensocs.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

12 files changed, 62 insertions, 83 deletions

diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index 62a291bbce..dc6f4e404f 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -92,9 +92,7 @@ static int virtio_9p_device_init(VirtIODevice *vdev)
     s->ctx.uid = -1;
 
     s->ops = fse->ops;
-    vdev->get_features = virtio_9p_get_features;
     s->config_size = sizeof(struct virtio_9p_config) + len;
-    vdev->get_config = virtio_9p_get_config;
     s->fid_list = NULL;
     qemu_co_rwlock_init(&s->rename_lock);
 
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index 9fdf009da5..efad690239 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -652,11 +652,6 @@ static int virtio_blk_device_init(VirtIODevice *vdev)
     virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK,
                 sizeof(struct virtio_blk_config));
 
-    vdev->get_config = virtio_blk_update_config;
-    vdev->set_config = virtio_blk_set_config;
-    vdev->get_features = virtio_blk_get_features;
-    vdev->set_status = virtio_blk_set_status;
-    vdev->reset = virtio_blk_reset;
     s->bs = blk->conf.bs;
     s->conf = &blk->conf;
     memcpy(&(s->blk), blk, sizeof(struct VirtIOBlkConf));
diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
index 35c996d4a1..6a5b8b670c 100644
--- a/hw/char/virtio-serial-bus.c
+++ b/hw/char/virtio-serial-bus.c
@@ -954,12 +954,6 @@ static int virtio_serial_device_init(VirtIODevice *vdev)
      */
     mark_port_added(vser, 0);
 
-    vdev->get_features = get_features;
-    vdev->get_config = get_config;
-    vdev->set_config = set_config;
-    vdev->set_status = set_status;
-    vdev->reset = vser_reset;
-
     vser->post_load = NULL;
 
     /*
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 4d2cdd23d5..0a0d51609c 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1283,15 +1283,6 @@ static int virtio_net_device_init(VirtIODevice *vdev)
     virtio_init(VIRTIO_DEVICE(n), "virtio-net", VIRTIO_ID_NET,
                                   n->config_size);
 
-    vdev->get_config = virtio_net_get_config;
-    vdev->set_config = virtio_net_set_config;
-    vdev->get_features = virtio_net_get_features;
-    vdev->set_features = virtio_net_set_features;
-    vdev->bad_features = virtio_net_bad_features;
-    vdev->reset = virtio_net_reset;
-    vdev->set_status = virtio_net_set_status;
-    vdev->guest_notifier_mask = virtio_net_guest_notifier_mask;
-    vdev->guest_notifier_pending = virtio_net_guest_notifier_pending;
     n->max_queues = MAX(n->nic_conf.queues, 1);
     n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
     n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
index 0cfbff6262..f7a2f4bafe 100644
--- a/hw/s390x/s390-virtio-bus.c
+++ b/hw/s390x/s390-virtio-bus.c
@@ -136,12 +136,13 @@ static int s390_virtio_device_init(VirtIOS390Device *dev, VirtIODevice *vdev)
     dev_len = VIRTIO_DEV_OFFS_CONFIG;
     dev_len += s390_virtio_device_num_vq(dev) * VIRTIO_VQCONFIG_LEN;
     dev_len += dev->feat_len * 2;
-    dev_len += vdev->config_len;
+    dev_len += virtio_bus_get_vdev_config_len(&dev->bus);
 
     bus->dev_offs += dev_len;
 
     virtio_bind_device(vdev, &virtio_s390_bindings, DEVICE(dev));
-    dev->host_features = vdev->get_features(vdev, dev->host_features);
+    dev->host_features = virtio_bus_get_vdev_features(&dev->bus,
+                                                      dev->host_features);
     s390_virtio_device_sync(dev);
     s390_virtio_reset_idx(dev);
     if (dev->qdev.hotplugged) {
@@ -368,9 +369,7 @@ void s390_virtio_device_sync(VirtIOS390Device *dev)
     cur_offs += dev->feat_len * 2;
 
     /* Sync config space */
-    if (dev->vdev->get_config) {
-        dev->vdev->get_config(dev->vdev, dev->vdev->config);
-    }
+    virtio_bus_get_vdev_config(&dev->bus, dev->vdev->config);
 
     cpu_physical_memory_write(cur_offs,
                               dev->vdev->config, dev->vdev->config_len);
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 0591dc2fb0..e14351cc4e 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -235,9 +235,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
             features.index = ldub_phys(ccw.cda + sizeof(features.features));
             features.features = ldl_le_phys(ccw.cda);
             if (features.index < ARRAY_SIZE(dev->host_features)) {
-                if (dev->vdev->set_features) {
-                    dev->vdev->set_features(dev->vdev, features.features);
-                }
+                virtio_bus_set_vdev_features(&dev->bus, features.features);
                 dev->vdev->guest_features = features.features;
             } else {
                 /*
@@ -265,7 +263,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
         if (!ccw.cda) {
             ret = -EFAULT;
         } else {
-            dev->vdev->get_config(dev->vdev, dev->vdev->config);
+            virtio_bus_get_vdev_config(&dev->bus, dev->vdev->config);
             /* XXX config space endianness */
             cpu_physical_memory_write(ccw.cda, dev->vdev->config, len);
             sch->curr_status.scsw.count = ccw.count - len;
@@ -292,9 +290,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
                 /* XXX config space endianness */
                 memcpy(dev->vdev->config, config, len);
                 cpu_physical_memory_unmap(config, hw_len, 0, hw_len);
-                if (dev->vdev->set_config) {
-                    dev->vdev->set_config(dev->vdev, dev->vdev->config);
-                }
+                virtio_bus_set_vdev_config(&dev->bus, dev->vdev->config);
                 sch->curr_status.scsw.count = ccw.count - len;
                 ret = 0;
             }
@@ -527,7 +523,9 @@ static int virtio_ccw_device_init(VirtioCcwDevice *dev, VirtIODevice *vdev)
 
     virtio_bind_device(vdev, &virtio_ccw_bindings, DEVICE(dev));
     /* Only the first 32 feature bits are used. */
-    dev->host_features[0] = vdev->get_features(vdev, dev->host_features[0]);
+    dev->host_features[0] = virtio_bus_get_vdev_features(&dev->bus,
+                                                         dev->host_features[0]);
+
     dev->host_features[0] |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
     dev->host_features[0] |= 0x1 << VIRTIO_F_BAD_FEATURE;
 
diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index 3dd1a0f2ed..3c93172e83 100644
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -217,10 +217,6 @@ static int vhost_scsi_init(VirtIODevice *vdev)
         return ret;
     }
 
-    vdev->get_features = vhost_scsi_get_features;
-    vdev->set_config = vhost_scsi_set_config;
-    vdev->set_status = vhost_scsi_set_status;
-
     s->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues;
     s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs);
     s->dev.vq_index = 0;
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 051daeac55..630e459b02 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -599,8 +599,6 @@ int virtio_scsi_common_init(VirtIOSCSICommon *s)
     s->sense_size = VIRTIO_SCSI_SENSE_SIZE;
     s->cdb_size = VIRTIO_SCSI_CDB_SIZE;
 
-    vdev->get_config = virtio_scsi_get_config;
-
     s->ctrl_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
                                   virtio_scsi_handle_ctrl);
     s->event_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
@@ -626,10 +624,6 @@ static int virtio_scsi_device_init(VirtIODevice *vdev)
         return ret;
     }
 
-    vdev->get_features = virtio_scsi_get_features;
-    vdev->set_config = virtio_scsi_set_config;
-    vdev->reset = virtio_scsi_reset;
-
     scsi_bus_new(&s->bus, qdev, &virtio_scsi_scsi_info);
     if (!qdev->hotplugged) {
         scsi_bus_legacy_handle_cmdline(&s->bus);
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 76e32ceef8..95fb3b06be 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -344,10 +344,6 @@ static int virtio_balloon_device_init(VirtIODevice *vdev)
 
     virtio_init(vdev, "virtio-balloon", VIRTIO_ID_BALLOON, 8);
 
-    vdev->get_config = virtio_balloon_get_config;
-    vdev->set_config = virtio_balloon_set_config;
-    vdev->get_features = virtio_balloon_get_features;
-
     ret = qemu_add_balloon_handler(virtio_balloon_to_target,
                                    virtio_balloon_stat, s);
 
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index c87ec104be..a624b03e69 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -267,10 +267,10 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 
     switch (addr) {
     case VIRTIO_PCI_GUEST_FEATURES:
-	/* Guest does not negotiate properly?  We have to assume nothing. */
-	if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
-            val = vdev->bad_features ? vdev->bad_features(vdev) : 0;
-	}
+        /* Guest does not negotiate properly?  We have to assume nothing. */
+        if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
+            val = virtio_bus_get_vdev_bad_features(&proxy->bus);
+        }
         virtio_set_features(vdev, val);
         break;
     case VIRTIO_PCI_QUEUE_PFN:
@@ -535,6 +535,7 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
 {
     PCIDevice *dev = &proxy->pci_dev;
     VirtIODevice *vdev = proxy->vdev;
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     unsigned int vector;
     int ret, queue_no;
     MSIMessage msg;
@@ -555,7 +556,7 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
         /* If guest supports masking, set up irqfd now.
          * Otherwise, delay until unmasked in the frontend.
          */
-        if (proxy->vdev->guest_notifier_mask) {
+        if (k->guest_notifier_mask) {
             ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
             if (ret < 0) {
                 kvm_virtio_pci_vq_vector_release(proxy, vector);
@@ -571,7 +572,7 @@ undo:
         if (vector >= msix_nr_vectors_allocated(dev)) {
             continue;
         }
-        if (proxy->vdev->guest_notifier_mask) {
+        if (k->guest_notifier_mask) {
             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
         }
         kvm_virtio_pci_vq_vector_release(proxy, vector);
@@ -585,6 +586,7 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
     VirtIODevice *vdev = proxy->vdev;
     unsigned int vector;
     int queue_no;
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 
     for (queue_no = 0; queue_no < nvqs; queue_no++) {
         if (!virtio_queue_get_num(vdev, queue_no)) {
@@ -597,7 +599,7 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
         /* If guest supports masking, clean up irqfd now.
          * Otherwise, it was cleaned when masked in the frontend.
          */
-        if (proxy->vdev->guest_notifier_mask) {
+        if (k->guest_notifier_mask) {
             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
         }
         kvm_virtio_pci_vq_vector_release(proxy, vector);
@@ -609,6 +611,7 @@ static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
                                        unsigned int vector,
                                        MSIMessage msg)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(proxy->vdev);
     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
     VirtIOIRQFD *irqfd;
@@ -627,11 +630,11 @@ static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
     /* If guest supports masking, irqfd is already setup, unmask it.
      * Otherwise, set it up now.
      */
-    if (proxy->vdev->guest_notifier_mask) {
-        proxy->vdev->guest_notifier_mask(proxy->vdev, queue_no, false);
+    if (k->guest_notifier_mask) {
+        k->guest_notifier_mask(proxy->vdev, queue_no, false);
         /* Test after unmasking to avoid losing events. */
-        if (proxy->vdev->guest_notifier_pending &&
-            proxy->vdev->guest_notifier_pending(proxy->vdev, queue_no)) {
+        if (k->guest_notifier_pending &&
+            k->guest_notifier_pending(proxy->vdev, queue_no)) {
             event_notifier_set(n);
         }
     } else {
@@ -644,11 +647,13 @@ static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
                                              unsigned int queue_no,
                                              unsigned int vector)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(proxy->vdev);
+
     /* If guest supports masking, keep irqfd but mask it.
      * Otherwise, clean it up now.
      */ 
-    if (proxy->vdev->guest_notifier_mask) {
-        proxy->vdev->guest_notifier_mask(proxy->vdev, queue_no, true);
+    if (k->guest_notifier_mask) {
+        k->guest_notifier_mask(proxy->vdev, queue_no, true);
     } else {
         kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
     }
@@ -708,6 +713,7 @@ static void virtio_pci_vector_poll(PCIDevice *dev,
 {
     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
     VirtIODevice *vdev = proxy->vdev;
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     int queue_no;
     unsigned int vector;
     EventNotifier *notifier;
@@ -724,8 +730,8 @@ static void virtio_pci_vector_poll(PCIDevice *dev,
         }
         vq = virtio_get_queue(vdev, queue_no);
         notifier = virtio_queue_get_guest_notifier(vq);
-        if (vdev->guest_notifier_pending) {
-            if (vdev->guest_notifier_pending(vdev, queue_no)) {
+        if (k->guest_notifier_pending) {
+            if (k->guest_notifier_pending(vdev, queue_no)) {
                 msix_set_pending(dev, vector);
             }
         } else if (event_notifier_test_and_clear(notifier)) {
@@ -765,6 +771,7 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
 {
     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
     VirtIODevice *vdev = proxy->vdev;
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     int r, n;
     bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
         kvm_msi_via_irqfd_enabled();
@@ -779,7 +786,7 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
     proxy->nvqs_with_notifiers = nvqs;
 
     /* Must unset vector notifier while guest notifier is still assigned */
-    if ((proxy->vector_irqfd || vdev->guest_notifier_mask) && !assign) {
+    if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) {
         msix_unset_vector_notifiers(&proxy->pci_dev);
         if (proxy->vector_irqfd) {
             kvm_virtio_pci_vector_release(proxy, nvqs);
@@ -801,7 +808,7 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
     }
 
     /* Must set vector notifier after guest notifier has been assigned */
-    if ((with_irqfd || vdev->guest_notifier_mask) && assign) {
+    if ((with_irqfd || k->guest_notifier_mask) && assign) {
         if (with_irqfd) {
             proxy->vector_irqfd =
                 g_malloc0(sizeof(*proxy->vector_irqfd) *
diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index 96e807539b..82d7a7436a 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -169,8 +169,6 @@ static int virtio_rng_device_init(VirtIODevice *vdev)
 
     vrng->vq = virtio_add_queue(vdev, 8, handle_input);
 
-    vdev->get_features = get_features;
-
     assert(vrng->conf.max_bytes <= INT64_MAX);
     vrng->quota_remaining = vrng->conf.max_bytes;
 
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 1c2282c54f..de54b41917 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -519,10 +519,11 @@ void virtio_update_irq(VirtIODevice *vdev)
 
 void virtio_set_status(VirtIODevice *vdev, uint8_t val)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     trace_virtio_set_status(vdev, val);
 
-    if (vdev->set_status) {
-        vdev->set_status(vdev, val);
+    if (k->set_status) {
+        k->set_status(vdev, val);
     }
     vdev->status = val;
 }
@@ -530,12 +531,14 @@ void virtio_set_status(VirtIODevice *vdev, uint8_t val)
 void virtio_reset(void *opaque)
 {
     VirtIODevice *vdev = opaque;
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     int i;
 
     virtio_set_status(vdev, 0);
 
-    if (vdev->reset)
-        vdev->reset(vdev);
+    if (k->reset) {
+        k->reset(vdev);
+    }
 
     vdev->guest_features = 0;
     vdev->queue_sel = 0;
@@ -559,9 +562,10 @@ void virtio_reset(void *opaque)
 
 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     uint8_t val;
 
-    vdev->get_config(vdev, vdev->config);
+    k->get_config(vdev, vdev->config);
 
     if (addr > (vdev->config_len - sizeof(val)))
         return (uint32_t)-1;
@@ -572,9 +576,10 @@ uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr)
 
 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     uint16_t val;
 
-    vdev->get_config(vdev, vdev->config);
+    k->get_config(vdev, vdev->config);
 
     if (addr > (vdev->config_len - sizeof(val)))
         return (uint32_t)-1;
@@ -585,9 +590,10 @@ uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr)
 
 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     uint32_t val;
 
-    vdev->get_config(vdev, vdev->config);
+    k->get_config(vdev, vdev->config);
 
     if (addr > (vdev->config_len - sizeof(val)))
         return (uint32_t)-1;
@@ -598,6 +604,7 @@ uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr)
 
 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     uint8_t val = data;
 
     if (addr > (vdev->config_len - sizeof(val)))
@@ -605,12 +612,14 @@ void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
 
     stb_p(vdev->config + addr, val);
 
-    if (vdev->set_config)
-        vdev->set_config(vdev, vdev->config);
+    if (k->set_config) {
+        k->set_config(vdev, vdev->config);
+    }
 }
 
 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     uint16_t val = data;
 
     if (addr > (vdev->config_len - sizeof(val)))
@@ -618,12 +627,14 @@ void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
 
     stw_p(vdev->config + addr, val);
 
-    if (vdev->set_config)
-        vdev->set_config(vdev, vdev->config);
+    if (k->set_config) {
+        k->set_config(vdev, vdev->config);
+    }
 }
 
 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     uint32_t val = data;
 
     if (addr > (vdev->config_len - sizeof(val)))
@@ -631,8 +642,9 @@ void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
 
     stl_p(vdev->config + addr, val);
 
-    if (vdev->set_config)
-        vdev->set_config(vdev, vdev->config);
+    if (k->set_config) {
+        k->set_config(vdev, vdev->config);
+    }
 }
 
 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr)
@@ -810,13 +822,14 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
 
 int virtio_set_features(VirtIODevice *vdev, uint32_t val)
 {
+    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
     uint32_t supported_features =
         vdev->binding->get_features(vdev->binding_opaque);
     bool bad = (val & ~supported_features) != 0;
 
     val &= supported_features;
-    if (vdev->set_features) {
-        vdev->set_features(vdev, val);
+    if (k->set_features) {
+        k->set_features(vdev, val);
     }
     vdev->guest_features = val;
     return bad ? -1 : 0;