<cpu mode='custom' match='exact'>
  <arch>x86_64</arch>
  <model fallback='forbid'>Penryn</model>
  <feature policy='require' name='vme'/>
  <feature policy='require' name='ss'/>
  <feature policy='require' name='x2apic'/>
  <feature policy='require' name='tsc-deadline'/>
  <feature policy='require' name='hypervisor'/>
  <feature policy='require' name='tsc_adjust'/>
  <feature policy='disable' name='sse4.1'/>
</cpu>