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