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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.

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s‰Get the vm mode for an instance

    :param instance: instance object to query

    :returns: canonicalized vm mode for the instance
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szCheck if a string is a valid vm mode

    :param name: vm mode name to validate

    :returns: True if @name is valid
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n|S(stCanonicalize the vm mode

    :param name: vm mode name to canonicalize

    :returns: a canonical vm mode name
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