Load machine type from command-line

Change-Id: Ib2bdac78e0eb4043e2a2f86244ea168641571817

devstack/tools/ironic/scripts/configure-vm.py

@@ -65,6 +65,8 @@ def main():
                         help='The virtualization engine to use')
     parser.add_argument('--arch', default='i686',
                         help='The architecture to use')
+    parser.add_argument('--machine_type', default='q35',
+                        help='Machine type based on architecture')
     parser.add_argument('--memory', default='2097152',
                         help="Maximum memory for the VM in KB.")
     parser.add_argument('--cpus', default='1',
@@ -104,6 +106,7 @@ def main():
         'images': images,
         'engine': args.engine,
         'arch': args.arch,
+        'machine_type': args.machine_type,
         'memory': args.memory,
         'cpus': args.cpus,
         'bootdev': args.bootdev,

devstack/tools/ironic/templates/vm.xml

@@ -3,7 +3,7 @@
   <memory unit='KiB'>{{ memory }}</memory>
   <vcpu>{{ cpus }}</vcpu>
   <os>
-    <type arch='{{ arch }}' machine='q35'>hvm</type>
+    <type arch='{{ arch }}' machine='{{ machine_type }}'>hvm</type>
     {% if bootdev == 'network' and not uefi_loader %}
     <boot dev='{{ bootdev }}'/>
     {% endif %}