set 0 to def max

vm.py

@@ -103,8 +103,8 @@ class VMInstance:
                 xml_top.append(child)
         # Basic virtual machine paramaters
         ET.SubElement(xml_top, 'name').text = self.name
+        if self.vcpu < self.vcpu_max and self.vcpu_max != 0:
             ET.SubElement(xml_top, 'vcpu', attrib={'current': str(self.vcpu)}).text = str(self.vcpu_max)
-        if self.vcpu < self.vcpu_max:
             vcpus = ET.SubElement(xml_top, 'vcpus')
             for i in range(0, self.vcpu):
                 ET.SubElement(vcpus, 'vcpu',
@@ -119,6 +119,7 @@ class VMInstance:
                           'enabled': 'no',
                           'hotpluggable': 'yes'})
         else:
+            ET.SubElement(xml_top, 'vcpu').text = str(self.vcpu)
             cpu = ET.SubElement(xml_top, 'cpu')
             ET.SubElement(cpu, 'topology',
                       attrib={