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No, you can use hw:numa_nodes=1 without hw:numa_cpus But I suggest you to drop both --property hw:numa_nodes=1 --property hw:numa_cpus.0=4. This undermines the cloud concept - you are introducing too much control on allocation.

hw:cpu_policy=dedicated should be enough. -Actually by default as I remember it will never allow you to have the VM split over 2 (or more) NUMA

hw:numa_cpus.0=4 sounds wrong: there you specify CPU IDs, not quantity of CPUs.

Specifying CPU IDs explicitly, as I mentioned below makes it less of a cloud.