more like this:

   <cputune>
       <cache id="1" host_id="2" type="l3" size="5632" unit="KiB"/>
       <cache id="2" host_id="4" type="l3" size="5632" unit="KiB"/>

       <cpu_cache vcpus="0-3" id="1"/>
       <cpu_cache vcpus="4-7" id="2"/>
       <iothread_cache iothreads="0-1" id="1"/>
       <emulator_cache id="2"/>
   </cputune>

Regards,
Daniel
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