diff --git a/nova/tests/unit/virt/libvirt/test_config.py b/nova/tests/unit/virt/libvirt/test_config.py
index fdbac5d98d4d..7aad1c9ea154 100644
--- a/nova/tests/unit/virt/libvirt/test_config.py
+++ b/nova/tests/unit/virt/libvirt/test_config.py
@@ -1027,6 +1027,18 @@ class LibvirtConfigGuestDiskTest(LibvirtConfigBaseTest):
                                                 obj.device_addr.unit))
         self.assertIsNone(obj.device_addr.format_address())
 
+    def test_config_disk_device_address_drive(self):
+        obj = config.LibvirtConfigGuestDeviceAddressDrive()
+        obj.controller = 1
+        obj.bus = 2
+        obj.target = 3
+        obj.unit = 4
+
+        xml = """
+        <address type="drive" controller="1" bus="2" target="3" unit="4"/>
+        """
+        self.assertXmlEqual(xml, obj.to_xml())
+
     def test_config_disk_device_address_type_virtio_mmio(self):
         xml = """
             <disk type='file' device='disk'>
diff --git a/nova/virt/libvirt/config.py b/nova/virt/libvirt/config.py
index 5f215c89eb3c..2547607bdfca 100644
--- a/nova/virt/libvirt/config.py
+++ b/nova/virt/libvirt/config.py
@@ -1138,6 +1138,11 @@ class LibvirtConfigGuestDeviceAddress(LibvirtConfigObject):
             root_name='address', **kwargs)
         self.type = type
 
+    def format_dom(self):
+        xml = super(LibvirtConfigGuestDeviceAddress, self).format_dom()
+        xml.set("type", self.type)
+        return xml
+
     @staticmethod
     def parse_dom(xmldoc):
         addr_type = xmldoc.get('type')
@@ -1160,6 +1165,20 @@ class LibvirtConfigGuestDeviceAddressDrive(LibvirtConfigGuestDeviceAddress):
         self.target = None
         self.unit = None
 
+    def format_dom(self):
+        xml = super(LibvirtConfigGuestDeviceAddressDrive, self).format_dom()
+
+        if self.controller is not None:
+            xml.set("controller", str(self.controller))
+        if self.bus is not None:
+            xml.set("bus", str(self.bus))
+        if self.target is not None:
+            xml.set("target", str(self.target))
+        if self.unit is not None:
+            xml.set("unit", str(self.unit))
+
+        return xml
+
     def parse_dom(self, xmldoc):
         self.controller = xmldoc.get('controller')
         self.bus = xmldoc.get('bus')