SCHEDOP_shutdown
rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
return HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);