def METHOD_NAME(session, host_stress):
    """
    Start running the hv_tlvflush tool on guest.
    param session: a loggined session to send commands
    return: the time result of the running, a float value
    """
    run_tlbflush_cmd = params["run_tlbflush_cmd"]
    run_tlbflush_timeout = params.get_numeric("run_tlbflush_timeout", 3600)
    test.log.info("Start stress on host")
    _start_host_stress(host_stress)
    test.log.info("Start run hv_tlbflush.exe on guest")
    s, o = session.cmd_status_output(run_tlbflush_cmd,
                                     run_tlbflush_timeout)
    test.log.info("Stop stress on host")
    _stop_host_stress(host_stress)
    if s:
        test.error("Run tlbflush error: status = %s, output = %s",
                   (s, o))
    time_str = o.strip().split('\n')[-1]
    time_str = time_str.split(".")[0]
    s_t = time.strptime(time_str, "%H:%M:%S")
    total_time = datetime.timedelta(hours=s_t.tm_hour,
                                    minutes=s_t.tm_min,
                                    seconds=s_t.tm_sec).total_seconds()
    test.log.info("Running result: %f", total_time)
    return total_time