Read from guest long time

Read data from /dev/random 10 hours
Signed-off-by: NSuqin Huang <shuang@redhat.com>

qemu/tests/cfg/rng_read_longtime.cfg

+- rng_read_longtime:
+    type = rng_bat
+    kill_vm = yes
+    virt_test_type = qemu
+    read_rng_timeout = 3600
+    no no_virtio_rng
+    test_duration = 36000
+    Windows:
+        # Please update path of rng_dll_register_cmd to right path which included you driver
+        #rng_dll_register_cmd = if not exist "C:\Windows\system32\viorngum.dll" copy PATH:\INCLUDEDRIVER\viorngum.dll C:\Windows\system32\ /y &&"
+        session_cmd_timeout = 240
+        read_rng_cmd = for /l %i in (1, 1, 30) do "WIN_UTILS:\random_%PROCESSOR_ARCHITECTURE%.exe"
+        driver_name = "viorng"
+        rng_data_rex = "0x\w"
+        driver_id_pattern = "(.*?):.*?VirtIO RNG Device"
+        i386:
+            driver_id_cmd = 'WIN_UTILS:\devcon\wxp_x86\devcon.exe find * | find "VirtIO"'
+            driver_check_cmd = "WIN_UTILS:\devcon\wxp_x86\devcon.exe status @DRIVER_ID"
+        x86_64:
+            driver_id_cmd = 'WIN_UTILS:\devcon\wnet_amd64\devcon.exe find * | find "VirtIO"'
+            driver_check_cmd = "WIN_UTILS:\devcon\wnet_amd64\devcon.exe status @DRIVER_ID"
+    Linux:
+        session_cmd_timeout = 360
+        read_rng_cmd = "dd if=/dev/random bs=4 count=100 2>/dev/null|hexdump"
+        driver_verifier_cmd = "cat /sys/devices/virtual/misc/hw_random/rng_current"
+        driver_name = virtio
+        rng_data_rex = "\w+"

qemu/tests/rng_bat.py

 import re
 import logging
 import aexpect
+import time
 
 from virttest import utils_misc
 from virttest import error_context
@@ -119,6 +120,15 @@ def run(test, params, env):
         logging.info("register 'viorngum.dll' into system")
         session.cmd(rng_dll_register_cmd, timeout=120)
 
+    if params.get("test_duration"):
+        start_time = time.time()
+        while (time.time() - start_time) < float(params.get("test_duration")):
+            output = session.cmd_output(read_rng_cmd,
+                                        timeout=read_rng_timeout)
+            if len(re.findall(rng_data_rex, output, re.M)) < 2:
+                raise exceptions.TestFail("Unable to read random numbers from"
+                                          "guest: %s" % output)
+    else:
         output = session.cmd_output(read_rng_cmd, timeout=read_rng_timeout)
         if len(re.findall(rng_data_rex, output, re.M)) < 2:
             raise exceptions.TestFail("Unable to read random numbers from"