diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index c19629d..270e2c7 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -669,9 +669,7 @@
     .vmstate_change = virtio_pci_vmstate_change,
 };
 
-static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,
-                            uint16_t vendor, uint16_t device,
-                            uint16_t class_code, uint8_t pif)
+static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev)
 {
     uint8_t *config;
     uint32_t size;
@@ -679,19 +677,12 @@
     proxy->vdev = vdev;
 
     config = proxy->pci_dev.config;
-    pci_config_set_vendor_id(config, vendor);
-    pci_config_set_device_id(config, device);
 
-    config[0x08] = VIRTIO_PCI_ABI_VERSION;
-
-    config[0x09] = pif;
-    pci_config_set_class(config, class_code);
-
-    config[0x2c] = vendor & 0xFF;
-    config[0x2d] = (vendor >> 8) & 0xFF;
-    config[0x2e] = vdev->device_id & 0xFF;
-    config[0x2f] = (vdev->device_id >> 8) & 0xFF;
-
+    if (proxy->class_code) {
+        pci_config_set_class(config, proxy->class_code);
+    }
+    pci_set_word(config + 0x2c, pci_get_word(config + PCI_VENDOR_ID));
+    pci_set_word(config + 0x2e, vdev->device_id);
     config[0x3d] = 1;
 
     if (vdev->nvectors && !msix_init(&proxy->pci_dev, vdev->nvectors, 1, 0)) {
@@ -735,10 +726,7 @@
         return -1;
     }
     vdev->nvectors = proxy->nvectors;
-    virtio_init_pci(proxy, vdev,
-                    PCI_VENDOR_ID_REDHAT_QUMRANET,
-                    PCI_DEVICE_ID_VIRTIO_BLOCK,
-                    proxy->class_code, 0x00);
+    virtio_init_pci(proxy, vdev);
     /* make the actual value visible */
     proxy->nvectors = vdev->nvectors;
     return 0;
@@ -776,10 +764,7 @@
     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
                                         ? proxy->serial.max_virtserial_ports + 1
                                         : proxy->nvectors;
-    virtio_init_pci(proxy, vdev,
-                    PCI_VENDOR_ID_REDHAT_QUMRANET,
-                    PCI_DEVICE_ID_VIRTIO_CONSOLE,
-                    proxy->class_code, 0x00);
+    virtio_init_pci(proxy, vdev);
     proxy->nvectors = vdev->nvectors;
     return 0;
 }
@@ -801,11 +786,7 @@
     vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net);
 
     vdev->nvectors = proxy->nvectors;
-    virtio_init_pci(proxy, vdev,
-                    PCI_VENDOR_ID_REDHAT_QUMRANET,
-                    PCI_DEVICE_ID_VIRTIO_NET,
-                    PCI_CLASS_NETWORK_ETHERNET,
-                    0x00);
+    virtio_init_pci(proxy, vdev);
 
     /* make the actual value visible */
     proxy->nvectors = vdev->nvectors;
@@ -827,11 +808,7 @@
     VirtIODevice *vdev;
 
     vdev = virtio_balloon_init(&pci_dev->qdev);
-    virtio_init_pci(proxy, vdev,
-                    PCI_VENDOR_ID_REDHAT_QUMRANET,
-                    PCI_DEVICE_ID_VIRTIO_BALLOON,
-                    PCI_CLASS_MEMORY_RAM,
-                    0x00);
+    virtio_init_pci(proxy, vdev);
     return 0;
 }
 
@@ -843,11 +820,7 @@
 
     vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf);
     vdev->nvectors = proxy->nvectors;
-    virtio_init_pci(proxy, vdev,
-                    PCI_VENDOR_ID_REDHAT_QUMRANET,
-                    0x1009,
-                    0x2,
-                    0x00);
+    virtio_init_pci(proxy, vdev);
     /* make the actual value visible */
     proxy->nvectors = vdev->nvectors;
     return 0;
@@ -861,6 +834,10 @@
         .qdev.size = sizeof(VirtIOPCIProxy),
         .init      = virtio_blk_init_pci,
         .exit      = virtio_blk_exit_pci,
+        .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
+        .device_id = PCI_DEVICE_ID_VIRTIO_BLOCK,
+        .revision  = VIRTIO_PCI_ABI_VERSION,
+        .class_id  = PCI_CLASS_STORAGE_SCSI,
         .qdev.props = (Property[]) {
             DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
             DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, block),
@@ -878,6 +855,10 @@
         .init       = virtio_net_init_pci,
         .exit       = virtio_net_exit_pci,
         .romfile    = "pxe-virtio.rom",
+        .vendor_id  = PCI_VENDOR_ID_REDHAT_QUMRANET,
+        .device_id  = PCI_DEVICE_ID_VIRTIO_NET,
+        .revision   = VIRTIO_PCI_ABI_VERSION,
+        .class_id   = PCI_CLASS_NETWORK_ETHERNET,
         .qdev.props = (Property[]) {
             DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
                             VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
@@ -898,6 +879,10 @@
         .qdev.size = sizeof(VirtIOPCIProxy),
         .init      = virtio_serial_init_pci,
         .exit      = virtio_serial_exit_pci,
+        .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
+        .device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE,
+        .revision  = VIRTIO_PCI_ABI_VERSION,
+        .class_id  = PCI_CLASS_COMMUNICATION_OTHER,
         .qdev.props = (Property[]) {
             DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
                             VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
@@ -916,6 +901,10 @@
         .qdev.size = sizeof(VirtIOPCIProxy),
         .init      = virtio_balloon_init_pci,
         .exit      = virtio_exit_pci,
+        .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
+        .device_id = PCI_DEVICE_ID_VIRTIO_BALLOON,
+        .revision  = VIRTIO_PCI_ABI_VERSION,
+        .class_id  = PCI_CLASS_MEMORY_RAM,
         .qdev.props = (Property[]) {
             DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
             DEFINE_PROP_END_OF_LIST(),
@@ -927,6 +916,10 @@
         .qdev.alias = "virtio-9p",
         .qdev.size = sizeof(VirtIOPCIProxy),
         .init      = virtio_9p_init_pci,
+        .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
+        .device_id = 0x1009,
+        .revision  = VIRTIO_PCI_ABI_VERSION,
+        .class_id  = 0x2,
         .qdev.props = (Property[]) {
             DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
             DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),