__pvclock_read_cycles
ret = __pvclock_read_cycles(pvti, rdtsc_ordered());
ret = __pvclock_read_cycles(src, rdtsc_ordered());
data->clock = __pvclock_read_cycles(&hv_clock, data->host_tsc);
__pvclock_read_cycles(&hv_clock, host_tsc);
guest_now = __pvclock_read_cycles(&hv_clock, guest_tsc);
*cycle = __pvclock_read_cycles(src, clock_pair->tsc);
system_counter->cycles = __pvclock_read_cycles(pvti,
GUEST_SYNC_CLOCK(i, __pvclock_read_cycles(pvti, rdtsc()));