pci: Create and register a new PCI Express TypeInfo

This will allow us to differentiate Express and Legacy buses.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/pci/pci.c

@@ -75,6 +75,11 @@ static const TypeInfo pci_bus_info = {
     .class_init = pci_bus_class_init,
 };
 
+static const TypeInfo pcie_bus_info = {
+    .name = TYPE_PCIE_BUS,
+    .parent = TYPE_PCI_BUS,
+};
+
 static PCIBus *pci_find_bus_nr(PCIBus *bus, int bus_num);
 static void pci_update_mappings(PCIDevice *d);
 static void pci_set_irq(void *opaque, int irq_num, int level);
@@ -2236,6 +2241,7 @@ static const TypeInfo pci_device_type_info = {
 static void pci_register_types(void)
 {
     type_register_static(&pci_bus_info);
+    type_register_static(&pcie_bus_info);
     type_register_static(&pci_device_type_info);
 }
 

hw/pci/pci_bus.h

@@ -10,6 +10,7 @@
 
 #define TYPE_PCI_BUS "PCI"
 #define PCI_BUS(obj) OBJECT_CHECK(PCIBus, (obj), TYPE_PCI_BUS)
+#define TYPE_PCIE_BUS "PCIE"
 
 struct PCIBus {
     BusState qbus;