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This setting is defined at the hypervisor level, typically in the configuration file for nova.

For example, using KVM the default hypervisor the Compute service enables you to control the guest CPU model that is exposed to KVM virtual machines.

In libvirt, the CPU is specified by providing a base CPU model name (which is a shorthand for a set of feature flags), a set of additional feature flags, and the topology (sockets/cores/threads). The libvirt KVM driver provides a number of standard CPU model names. These models are defined in the /usr/share/libvirt/cpu_map.xml file. Check this file to determine which models are supported by your local installation.

For more details, see