diff --git a/hw/virtio-console.c b/hw/virtio-console.c
index 6c32e7f..2debedb 100644
--- a/hw/virtio-console.c
+++ b/hw/virtio-console.c
@@ -98,10 +98,9 @@ static void chr_event(void *opaque, int event)
 static int virtconsole_initfn(VirtIOSerialPort *port)
 {
     VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
-    VirtIOSerialPortInfo *info = DO_UPCAST(VirtIOSerialPortInfo, qdev,
-                                           qdev_get_info(&vcon->port.dev));
+    VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
 
-    if (port->id == 0 && !info->is_console) {
+    if (port->id == 0 && !k->is_console) {
         error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
         return -1;
     }
@@ -112,9 +111,9 @@ static int virtconsole_initfn(VirtIOSerialPort *port)
         /* FIXME: This is not right */
         abort();
         if (0) {
-            info->have_data = flush_buf;
-            info->guest_open = guest_open;
-            info->guest_close = guest_close;
+            k->have_data = flush_buf;
+            k->guest_open = guest_open;
+            k->guest_close = guest_close;
         }
     }
 
@@ -136,16 +135,25 @@ static int virtconsole_exitfn(VirtIOSerialPort *port)
     return 0;
 }
 
-static VirtIOSerialPortInfo virtconsole_info = {
-    .qdev.name     = "virtconsole",
-    .qdev.size     = sizeof(VirtConsole),
-    .is_console    = true,
-    .init          = virtconsole_initfn,
-    .exit          = virtconsole_exitfn,
-    .qdev.props = (Property[]) {
-        DEFINE_PROP_CHR("chardev", VirtConsole, chr),
-        DEFINE_PROP_END_OF_LIST(),
-    },
+static Property virtconsole_properties[] = {
+    DEFINE_PROP_CHR("chardev", VirtConsole, chr),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void virtconsole_class_init(ObjectClass *klass, void *data)
+{
+    VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
+
+    k->is_console = true;
+    k->init = virtconsole_initfn;
+    k->exit = virtconsole_exitfn;
+}
+
+static DeviceInfo virtconsole_info = {
+    .name = "virtconsole",
+    .size = sizeof(VirtConsole),
+    .props = virtconsole_properties,
+    .class_init = virtconsole_class_init,
 };
 
 static void virtconsole_register(void)
@@ -154,15 +162,24 @@ static void virtconsole_register(void)
 }
 device_init(virtconsole_register)
 
-static VirtIOSerialPortInfo virtserialport_info = {
-    .qdev.name     = "virtserialport",
-    .qdev.size     = sizeof(VirtConsole),
-    .init          = virtconsole_initfn,
-    .exit          = virtconsole_exitfn,
-    .qdev.props = (Property[]) {
-        DEFINE_PROP_CHR("chardev", VirtConsole, chr),
-        DEFINE_PROP_END_OF_LIST(),
-    },
+static Property virtserialport_properties[] = {
+    DEFINE_PROP_CHR("chardev", VirtConsole, chr),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void virtserialport_class_init(ObjectClass *klass, void *data)
+{
+    VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_CLASS(klass);
+
+    k->init = virtconsole_initfn;
+    k->exit = virtconsole_exitfn;
+}
+
+static DeviceInfo virtserialport_info = {
+    .name = "virtserialport",
+    .size = sizeof(VirtConsole),
+    .props = virtserialport_properties,
+    .class_init = virtserialport_class_init,
 };
 
 static void virtserialport_register(void)
diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index b9c8ca7..dfda987 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -130,12 +130,12 @@ static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev)
 static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq,
                                  VirtIODevice *vdev)
 {
-    VirtIOSerialPortInfo *info;
+    VirtIOSerialPortClass *vsc;
 
     assert(port);
     assert(virtio_queue_ready(vq));
 
-    info = DO_UPCAST(VirtIOSerialPortInfo, qdev, qdev_get_info(&port->dev));
+    vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
 
     while (!port->throttled) {
         unsigned int i;
@@ -154,7 +154,7 @@ static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq,
             ssize_t ret;
 
             buf_size = port->elem.out_sg[i].iov_len - port->iov_offset;
-            ret = info->have_data(port,
+            ret = vsc->have_data(port,
                                   port->elem.out_sg[i].iov_base
                                   + port->iov_offset,
                                   buf_size);
@@ -316,7 +316,7 @@ void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle)
 static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
 {
     struct VirtIOSerialPort *port;
-    struct VirtIOSerialPortInfo *info;
+    VirtIOSerialPortClass *vsc;
     struct virtio_console_control cpkt, *gcpkt;
     uint8_t *buffer;
     size_t buffer_len;
@@ -358,7 +358,7 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
 
     trace_virtio_serial_handle_control_message_port(port->id);
 
-    info = DO_UPCAST(VirtIOSerialPortInfo, qdev, qdev_get_info(&port->dev));
+    vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
 
     switch(cpkt.event) {
     case VIRTIO_CONSOLE_PORT_READY:
@@ -374,7 +374,7 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
          * this port is a console port so that the guest can hook it
          * up to hvc.
          */
-        if (info->is_console) {
+        if (vsc->is_console) {
             send_control_event(port, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
         }
 
@@ -403,21 +403,21 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
          * initialised. If some app is interested in knowing about
          * this event, let it know.
          */
-        if (info->guest_ready) {
-            info->guest_ready(port);
+        if (vsc->guest_ready) {
+            vsc->guest_ready(port);
         }
         break;
 
     case VIRTIO_CONSOLE_PORT_OPEN:
         port->guest_connected = cpkt.value;
-        if (cpkt.value && info->guest_open) {
+        if (cpkt.value && vsc->guest_open) {
             /* Send the guest opened notification if an app is interested */
-            info->guest_open(port);
+            vsc->guest_open(port);
         }
 
-        if (!cpkt.value && info->guest_close) {
+        if (!cpkt.value && vsc->guest_close) {
             /* Send the guest closed notification if an app is interested */
-            info->guest_close(port);
+            vsc->guest_close(port);
         }
         break;
     }
@@ -466,13 +466,13 @@ static void handle_output(VirtIODevice *vdev, VirtQueue *vq)
 {
     VirtIOSerial *vser;
     VirtIOSerialPort *port;
-    VirtIOSerialPortInfo *info;
+    VirtIOSerialPortClass *vsc;
 
     vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
     port = find_port_by_vq(vser, vq);
-    info = port ? DO_UPCAST(VirtIOSerialPortInfo, qdev, qdev_get_info(&port->dev)) : NULL;
+    vsc = port ? VIRTIO_SERIAL_PORT_GET_CLASS(port) : NULL;
 
-    if (!port || !port->host_connected || !info->have_data) {
+    if (!port || !port->host_connected || !vsc->have_data) {
         discard_vq_data(vq, vdev);
         return;
     }
@@ -738,7 +738,7 @@ static void remove_port(VirtIOSerial *vser, uint32_t port_id)
 static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
 {
     VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
-    VirtIOSerialPortInfo *info = DO_UPCAST(VirtIOSerialPortInfo, qdev, base);
+    VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
     VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus);
     int ret, max_nr_ports;
     bool plugging_port0;
@@ -751,7 +751,7 @@ static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
      * location 0. This is done for backward compatibility (old
      * kernel, new qemu).
      */
-    plugging_port0 = info->is_console && !find_port_by_id(port->vser, 0);
+    plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0);
 
     if (find_port_by_id(port->vser, port->id)) {
         error_report("virtio-serial-bus: A port already exists at id %u",
@@ -778,7 +778,7 @@ static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
         return -1;
     }
 
-    ret = info->init(port);
+    ret = vsc->init(port);
     if (ret) {
         return ret;
     }
@@ -808,8 +808,7 @@ static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
 static int virtser_port_qdev_exit(DeviceState *qdev)
 {
     VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
-    VirtIOSerialPortInfo *info = DO_UPCAST(VirtIOSerialPortInfo, qdev,
-                                           qdev_get_info(&port->dev));
+    VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
     VirtIOSerial *vser = port->vser;
 
     qemu_bh_delete(port->bh);
@@ -817,19 +816,19 @@ static int virtser_port_qdev_exit(DeviceState *qdev)
 
     QTAILQ_REMOVE(&vser->ports, port, next);
 
-    if (info->exit) {
-        info->exit(port);
+    if (vsc->exit) {
+        vsc->exit(port);
     }
     return 0;
 }
 
-void virtio_serial_port_qdev_register(VirtIOSerialPortInfo *info)
+void virtio_serial_port_qdev_register(DeviceInfo *info)
 {
-    info->qdev.init = virtser_port_qdev_init;
-    info->qdev.bus_info = &virtser_bus_info;
-    info->qdev.exit = virtser_port_qdev_exit;
-    info->qdev.unplug = qdev_simple_unplug_cb;
-    qdev_register(&info->qdev);
+    info->init = virtser_port_qdev_init;
+    info->bus_info = &virtser_bus_info;
+    info->exit = virtser_port_qdev_exit;
+    info->unplug = qdev_simple_unplug_cb;
+    qdev_register_subclass(info, TYPE_VIRTIO_SERIAL_PORT);
 }
 
 VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf)
@@ -925,3 +924,18 @@ void virtio_serial_exit(VirtIODevice *vdev)
 
     virtio_cleanup(vdev);
 }
+
+static TypeInfo virtio_serial_port_type_info = {
+    .name = TYPE_VIRTIO_SERIAL_PORT,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(VirtIOSerialPort),
+    .abstract = true,
+    .class_size = sizeof(VirtIOSerialPortClass),
+};
+
+static void virtio_serial_register_devices(void)
+{
+    type_register_static(&virtio_serial_port_type_info);
+}
+
+device_init(virtio_serial_register_devices);
diff --git a/hw/virtio-serial.h b/hw/virtio-serial.h
index ab13803..6207c89 100644
--- a/hw/virtio-serial.h
+++ b/hw/virtio-serial.h
@@ -62,10 +62,52 @@ struct virtio_serial_conf {
 
 /* == In-qemu interface == */
 
+#define TYPE_VIRTIO_SERIAL_PORT "virtio-serial-port"
+#define VIRTIO_SERIAL_PORT(obj) \
+     OBJECT_CHECK(VirtIOSerialPort, (obj), TYPE_VIRTIO_SERIAL_PORT)
+#define VIRTIO_SERIAL_PORT_CLASS(klass) \
+     OBJECT_CLASS_CHECK(VirtIOSerialPortClass, (klass), TYPE_VIRTIO_SERIAL_PORT)
+#define VIRTIO_SERIAL_PORT_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(VirtIOSerialPortClass, (obj), TYPE_VIRTIO_SERIAL_PORT)
+
 typedef struct VirtIOSerial VirtIOSerial;
 typedef struct VirtIOSerialBus VirtIOSerialBus;
 typedef struct VirtIOSerialPort VirtIOSerialPort;
-typedef struct VirtIOSerialPortInfo VirtIOSerialPortInfo;
+
+typedef struct VirtIOSerialPortClass {
+    DeviceClass parent_class;
+
+    /* Is this a device that binds with hvc in the guest? */
+    bool is_console;
+
+    /*
+     * The per-port (or per-app) init function that's called when a
+     * new device is found on the bus.
+     */
+    int (*init)(VirtIOSerialPort *port);
+    /*
+     * Per-port exit function that's called when a port gets
+     * hot-unplugged or removed.
+     */
+    int (*exit)(VirtIOSerialPort *port);
+
+    /* Callbacks for guest events */
+        /* Guest opened device. */
+    void (*guest_open)(VirtIOSerialPort *port);
+        /* Guest closed device. */
+    void (*guest_close)(VirtIOSerialPort *port);
+
+        /* Guest is now ready to accept data (virtqueues set up). */
+    void (*guest_ready)(VirtIOSerialPort *port);
+
+    /*
+     * Guest wrote some data to the port. This data is handed over to
+     * the app via this callback.  The app can return a size less than
+     * 'len'.  In this case, throttling will be enabled for this port.
+     */
+    ssize_t (*have_data)(VirtIOSerialPort *port, const uint8_t *buf,
+                         size_t len);
+} VirtIOSerialPortClass;
 
 /*
  * This is the state that's shared between all the ports.  Some of the
@@ -131,48 +173,13 @@ struct VirtIOSerialPort {
     bool throttled;
 };
 
-struct VirtIOSerialPortInfo {
-    DeviceInfo qdev;
-
-    /* Is this a device that binds with hvc in the guest? */
-    bool is_console;
-
-    /*
-     * The per-port (or per-app) init function that's called when a
-     * new device is found on the bus.
-     */
-    int (*init)(VirtIOSerialPort *port);
-    /*
-     * Per-port exit function that's called when a port gets
-     * hot-unplugged or removed.
-     */
-    int (*exit)(VirtIOSerialPort *port);
-
-    /* Callbacks for guest events */
-        /* Guest opened device. */
-    void (*guest_open)(VirtIOSerialPort *port);
-        /* Guest closed device. */
-    void (*guest_close)(VirtIOSerialPort *port);
-
-        /* Guest is now ready to accept data (virtqueues set up). */
-    void (*guest_ready)(VirtIOSerialPort *port);
-
-    /*
-     * Guest wrote some data to the port. This data is handed over to
-     * the app via this callback.  The app can return a size less than
-     * 'len'.  In this case, throttling will be enabled for this port.
-     */
-    ssize_t (*have_data)(VirtIOSerialPort *port, const uint8_t *buf,
-                         size_t len);
-};
-
 /* Interface to the virtio-serial bus */
 
 /*
  * Individual ports/apps should call this function to register the port
  * with the virtio-serial bus
  */
-void virtio_serial_port_qdev_register(VirtIOSerialPortInfo *info);
+void virtio_serial_port_qdev_register(DeviceInfo *info);
 
 /*
  * Open a connection to the port
