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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 Red Hat, Inc.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Possible vm modes for instances.
Compute instance vm modes represent the host/guest ABI used for the
virtual machine / container. Individual hypervisors may support
multiple different vm modes per host. Available vm modes for a hypervisor
driver may also vary according to the architecture it is running on.
The 'vm_mode' parameter can be set against an instance to
choose what sort of VM to boot.
"""
from nova import exception
HVM = "hvm" # Fully virtualized
XEN = "xen" # Xen 3.0 paravirtualized
UML = "uml" # User Mode Linux paravirtualized
EXE = "exe" # Executables in containers
ALL = [HVM, XEN, UML, EXE]
def get_from_instance(instance):
mode = instance['vm_mode']
if mode is None:
return None
mode = mode.lower()
# For compatibility with pre-Folsom deployments
if mode == "pv":
mode = XEN
if mode == "hv":
mode = HVM
if mode not in ALL:
raise exception.Invalid("Unknown vm mode '%s'" % mode)
return mode
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