Clear assigned PCI devices at shutdown

The PCI device addresses are only valid while the VM is running,
since they are auto-assigned by QEMU. After shutdown they must
all be cleared. Future QEMU driver enhancement will allow for
persistent PCI address assignment

* src/conf/domain_conf.h, src/conf/domain_conf.c, src/libvirt_private.syms
  Add virDomainDefClearPCIAddresses() method for wiping out auto assigned
  PCI addresses
* src/qemu/qemu_driver.c: Clear PCI addresses at VM shutdown

src/conf/domain_conf.c

@@ -817,6 +817,42 @@ void virDomainDeviceInfoClear(virDomainDeviceInfoPtr info)
 }
 
 
+static void virDomainDeviceInfoClearField(virDomainDeviceInfoPtr info)
+{
+    if (info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI) {
+        memset(&info->addr, 0, sizeof(info->addr));
+        info->type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE;
+    }
+}
+
+
+static void virDomainDefClearDeviceInfo(virDomainDefPtr def)
+{
+    int i;
+
+    for (i = 0; i < def->ndisks ; i++)
+        virDomainDeviceInfoClearField(&def->disks[i]->info);
+    for (i = 0; i < def->nnets ; i++)
+        virDomainDeviceInfoClearField(&def->nets[i]->info);
+    for (i = 0; i < def->nsounds ; i++)
+        virDomainDeviceInfoClearField(&def->sounds[i]->info);
+    for (i = 0; i < def->nhostdevs ; i++)
+        virDomainDeviceInfoClearField(&def->hostdevs[i]->info);
+    for (i = 0; i < def->nvideos ; i++)
+            virDomainDeviceInfoClearField(&def->videos[i]->info);
+    for (i = 0; i < def->ncontrollers ; i++)
+            virDomainDeviceInfoClearField(&def->controllers[i]->info);
+    if (def->watchdog)
+        virDomainDeviceInfoClearField(&def->watchdog->info);
+}
+
+
+void virDomainDefClearPCIAddresses(virDomainDefPtr def)
+{
+    virDomainDefClearDeviceInfo(def);
+}
+
+
 /* Generate a string representation of a device address
  * @param address Device address to stringify
  */

src/conf/domain_conf.h

@@ -736,6 +736,8 @@ int virDomainDevicePCIAddressIsValid(virDomainDevicePCIAddressPtr addr);
 int virDomainDeviceDriveAddressIsValid(virDomainDeviceDriveAddressPtr addr);
 int virDomainDeviceInfoIsSet(virDomainDeviceInfoPtr info);
 void virDomainDeviceInfoClear(virDomainDeviceInfoPtr info);
+void virDomainDefClearPCIAddresses(virDomainDefPtr def);
+
 void virDomainDefFree(virDomainDefPtr vm);
 void virDomainObjRef(virDomainObjPtr vm);
 /* Returns 1 if the object was freed, 0 if more refs exist */

src/libvirt_private.syms

@@ -187,6 +187,7 @@ virDomainControllerTypeToString;
 virDomainControllerDefFree;
 virDomainDeviceAddressTypeToString;
 virDomainDefAddDiskControllers;
+virDomainDefClearPCIAddresses;
 
 
 # domain_event.h

src/qemu/qemu_driver.c

@@ -3048,6 +3048,8 @@ static void qemudShutdownVMDaemon(virConnectPtr conn,
         VIR_FREE(vm->def->seclabel.imagelabel);
     }
 
+    virDomainDefClearPCIAddresses(vm->def);
+
     if (qemuDomainSetAllDeviceOwnership(conn, driver, vm->def, 1) < 0)
         VIR_WARN("Failed to restore all device ownership for %s",
                  vm->def->name);