<cpu mode='custom' match='exact'> <arch>x86_64</arch> <model fallback='forbid'>SandyBridge</model> <feature policy='require' name='vme'/> <feature policy='require' name='ss'/> <feature policy='require' name='pcid'/> <feature policy='require' name='hypervisor'/> <feature policy='require' name='arat'/> <feature policy='require' name='tsc_adjust'/> <feature policy='require' name='xsaveopt'/> </cpu>