Implementation of getting the iommu pci devices address

Add the function of getting the pci devices addresses
sharing the same iommuGroup.

Signed-off-by: Lily Zhu <[email protected]>

virttest/libvirt_xml/nodedev_xml.py

@@ -140,8 +140,27 @@ class for capability whose type is pci.
     #  <numa node='0'/>
     #</capability>
 
+    # or the Example of iommu:
+    #<capability type="pci">
+    #<domain>0</domain>
+    #<bus>4</bus>
+    #<slot>0</slot>
+    #<function>1</function>
+    #<product id="0x1639">NetXtreme II BCM5709 Gigabit Ethernet</product>
+    #<vendor id="0x14e4">Broadcom Limited</vendor>
+    #<iommuGroup number="15">
+    #  <address bus="0x04" domain="0x0000" function="0x0" slot="0x00" />
+    #  <address bus="0x04" domain="0x0000" function="0x1" slot="0x00" />
+    #</iommuGroup>
+    #<numa node="0" />
+    #<pci-express>
+    #  <link port="0" speed="5" validity="cap" width="4" />
+    #  <link speed="5" validity="sta" width="4" />
+    #</pci-express>
+    #</capability>
+
     __slots__ = ('domain', 'bus', 'slot', 'function', 'product_id',
-                 'vendor_id', 'virt_functions', 'numa_node')
+                 'vendor_id', 'virt_functions', 'iommuGroup_number', 'numa_node')
 
     def __init__(self, virsh_instance=base.virsh):
         accessors.XMLElementInt('domain', self, parent_xpath='/',
@@ -162,6 +181,10 @@ def __init__(self, virsh_instance=base.virsh):
                                  parent_xpath='/capability',
                                  marshal_from=self.marshal_from_address,
                                  marshal_to=self.marshal_to_address)
+        accessors.XMLElementList('iommuGroup_number', self,
+                                 parent_xpath='/iommuGroup',
+                                 marshal_from=self.marshal_from_address,
+                                 marshal_to=self.marshal_to_address)
         super(PCIXML, self).__init__(virsh_instance=virsh_instance)
         self.xml = (' <capability type=\'pci\'></capability>')