code: def _get_vm(name=None, session=None):
      '''
      Get XEN vm instance object reference
      '''
      if session is None:
          session = _get_session()
      vms = session.xenapi.VM.get_by_name_label(name)
      if len(vms) == 1:
          return vms[0]
      return Nonf _get_vm(name=None, session=None):
      '''
      Get XEN vm instance object reference
      '''
      if session is None:
          session = _get_session()
      vms = session.xenapi.VM.get_by_name_label(name)
      if len(vms) == 1:
          return vms[0]
      return None
docs: Get XEN vm instance object reference