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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

Use a Script to Resize the Memory

#!/bin/bash
 
VM_ID="my_vm_id"
NEW_AMOUNT="4000"
 
EDITOR='sed -i "s;[0-9]*</currentMemory>;$NEW_AMOUNT</currentMemory>;"' virsh edit $VM_ID
EDITOR='sed -i "s;[0-9]*</memory>;$NEW_AMOUNT</memory>;"' virsh edit $VM_ID
 
virsh shutdown $VM_ID
virsh start $VM_ID