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No, there's only the config option you've mentioned. The config option has to be set in the compute nodes' nova.conf files in order for it to take effect. Changing its value won't affect any existing instances (you cannot change this while the VM is running), so if you want to change the CPU compatibility for existing VMs, you'll have to do it manually.

The config option is taken into account when the instance is created (spawn, rebuild, shelve/unshelve).

Best regards,

Claudiu Belu