diff --git a/include/kvm/ioport.h b/include/kvm/ioport.h
index 4243850..75678c0 100644
--- a/include/kvm/ioport.h
+++ b/include/kvm/ioport.h
@@ -6,7 +6,7 @@
 
 /* some ports we reserve for own use */
 #define IOPORT_DBG	0xe0
-#define IOPORT_VIRTIO	0xea
+#define IOPORT_VIRTIO	0xc200
 
 struct kvm;
 
diff --git a/pci.c b/pci.c
index 1341494..39db138 100644
--- a/pci.c
+++ b/pci.c
@@ -34,15 +34,20 @@ static bool pci_config_data_out(struct kvm *self, uint16_t port, void *data, int
 	return true;
 }
 
-#define PCI_VENDOR_ID_REDHAT_QUMRANET	0x1af4
-#define PCI_DEVICE_ID_VIRTIO_BLK	0x1001
+#define PCI_VENDOR_ID_REDHAT_QUMRANET		0x1af4
+#define PCI_DEVICE_ID_VIRTIO_BLK		0x1001
+#define PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET	0x1af4
+#define PCI_SUBSYSTEM_ID_VIRTIO_BLK		0x0002
 
 static struct pci_device_header virtio_device = {
 	.vendor_id		= PCI_VENDOR_ID_REDHAT_QUMRANET,
 	.device_id		= PCI_DEVICE_ID_VIRTIO_BLK,
 	.header_type		= PCI_HEADER_TYPE_NORMAL,
-	/* .class			= (0x01 << 16) | (0x01 << 8) | ((1<<7) | 	 * (1<<1)), */
-	.bar[0]			= (IOPORT_VIRTIO << 4) | PCI_BASE_ADDRESS_SPACE_IO,
+	.revision_id		= 0,
+	.class			= 0x010000,
+	.subsys_vendor_id	= PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET,
+	.subsys_id		= PCI_SUBSYSTEM_ID_VIRTIO_BLK,
+	.bar[0]			= IOPORT_VIRTIO | PCI_BASE_ADDRESS_SPACE_IO,
 };
 
 static bool pci_device_matches(uint8_t bus_number, uint8_t device_number, uint8_t function_number)