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I'm not sure how Qemu would emulate a NUMA arch on a non-NUMA machine.

It doesn't even attempt to emulate different memory models WRT where you need barriers AFAIK.

You can Use -smp 8 -numa node,nodeid=0 -numa node,nodeid=1

All that does is lie to the guest over firmware (device tree, ACPI, etc.). All of the memory accesses are still uniform as far as CPU emulation is concerned.

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