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KVM - Change Memory of a Guest

Bring up the config for the guest:

virsh edit VM_ID

Change the memory and currentMemory fields to be the size you want in KiB:

  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>4194304</currentMemory>

Restart for the changes to take effect:

virsh shutdown VM_ID
virsh start VM_ID