NUMA node - Memory Only

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Hi, libvirt-users
How could I set up a memory-only and no-cpu NUMA node for the qemu-VM with the XML file?

Seems each NUMA cell has to be bundled with some specific cpuids.
If I write the element like this, it is wrong.

<cpu mode='host-passthrough'>
    <cell id='0' cpus='0-3' memory='16' unit='GiB'/>
    <cell id='1' cpus='null' memory='16' unit='GiB'/>
Also if I ignore the cpus item, it is not acceptable for the virsh command.

The reason I want the memory-only node is that I want to set up multiple memory tiers for the VM, just like

Thank You
Jin Huang

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