[RFC,08/17] hw/pci: made pci_bus_num a PCIBusClass method

diff --git a/hw/i386/kvm/pci-assign.c b/hw/i386/kvm/pci-assign.c
index bb206da..fa67b1d 100644
--- a/hw/i386/kvm/pci-assign.c
+++ b/hw/i386/kvm/pci-assign.c
@@ -35,6 +35,7 @@ 
 #include "qemu/range.h"
 #include "sysemu/sysemu.h"
 #include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
 #include "hw/pci/msi.h"
 #include "kvm_i386.h"
 
diff --git a/hw/pci/pci-hotplug-old.c b/hw/pci/pci-hotplug-old.c
index 0c09c72..6f208d8 100644
--- a/hw/pci/pci-hotplug-old.c
+++ b/hw/pci/pci-hotplug-old.c
@@ -27,6 +27,7 @@ 
 #include "hw/hw.h"
 #include "hw/boards.h"
 #include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
 #include "net/net.h"
 #include "hw/i386/pc.h"
 #include "monitor/monitor.h"
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 0b4e138..dccb3d1 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -300,13 +300,6 @@  PCIBus *pci_register_bus(DeviceState *parent, const char *name,
     return bus;
 }
 
-int pci_bus_num(PCIBus *s)
-{
-    if (pci_bus_is_root(s))
-        return 0;       /* pci host bridge */
-    return s->parent_dev->config[PCI_SECONDARY_BUS];
-}
-
 static int get_pci_config_device(QEMUFile *f, void *pv, size_t size)
 {
     PCIDevice *s = container_of(pv, PCIDevice, config);
diff --git a/hw/pci/pci_bus.c b/hw/pci/pci_bus.c
index 0922a75..ed99208 100644
--- a/hw/pci/pci_bus.c
+++ b/hw/pci/pci_bus.c
@@ -469,6 +469,15 @@  static bool pcibus_is_root(PCIBus *bus)
     return !bus->parent_dev;
 }
 
+static int pcibus_num(PCIBus *bus)
+{
+    if (pcibus_is_root(bus)) {
+        return 0;       /* pci host bridge */
+    }
+
+    return bus->parent_dev->config[PCI_SECONDARY_BUS];
+}
+
 static void pci_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *k = BUS_CLASS(klass);
@@ -482,6 +491,7 @@  static void pci_bus_class_init(ObjectClass *klass, void *data)
     k->reset = pcibus_reset;
 
     pbc->is_root = pcibus_is_root;
+    pbc->bus_num = pcibus_num;
 }
 
 static const TypeInfo pci_bus_info = {
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 4852237..fa4e3d0 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -20,6 +20,7 @@ 
 
 #include "hw/hw.h"
 #include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
 #include "sysemu/dma.h"
 #include "sysemu/block-backend.h"
 #include "hw/pci/msi.h"
diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index f2893b2..cf56a48 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -55,6 +55,7 @@ 
 #include <sys/ioctl.h>
 
 #include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
 #include "hw/xen/xen.h"
 #include "hw/xen/xen_backend.h"
 #include "xen_pt.h"
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 7b2567a..b7e24d4 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -376,7 +376,6 @@  PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus,
 
 PCIDevice *pci_vga_init(PCIBus *bus);
 
-int pci_bus_num(PCIBus *s);
 void pci_for_each_device(PCIBus *bus, int bus_num,
                          void (*fn)(PCIBus *bus, PCIDevice *d, void *opaque),
                          void *opaque);
diff --git a/include/hw/pci/pci_bus.h b/include/hw/pci/pci_bus.h
index 306ef10..553814e 100644
--- a/include/hw/pci/pci_bus.h
+++ b/include/hw/pci/pci_bus.h
@@ -24,6 +24,7 @@  typedef struct PCIBusClass {
     /*< public >*/
 
     bool (*is_root)(PCIBus *bus);
+    int (*bus_num)(PCIBus *bus);
 } PCIBusClass;
 
 struct PCIBus {
@@ -54,6 +55,11 @@  static inline bool pci_bus_is_root(PCIBus *bus)
     return PCI_BUS_GET_CLASS(bus)->is_root(bus);
 }
 
+static inline int pci_bus_num(PCIBus *bus)
+{
+    return PCI_BUS_GET_CLASS(bus)->bus_num(bus);
+}
+
 typedef struct PCIBridgeWindows PCIBridgeWindows;
 
 /*