<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>