HYPERV_TIMER_NS_FACTOR
#define HYPERV_TIMER_FREQ (NANOSEC / HYPERV_TIMER_NS_FACTOR)
hv_ns = (hvtime - VMBUS_ICMSG_TS_BASE + rtt) * HYPERV_TIMER_NS_FACTOR;
(val.tv_nsec / HYPERV_TIMER_NS_FACTOR);