<cpu mode='custom' match='exact'> <arch>x86_64</arch> <model fallback='allow'>Penryn</model> <feature policy='require' name='svm'/> <feature policy='require' name='3dnowext'/> <feature policy='require' name='monitor'/> <feature policy='require' name='pbe'/> <feature policy='disable' name='sse'/> </cpu>