Add more scenerios to win virtio driver test

qemu/tests/cfg/win_virtio_driver_update_test.cfg

 - win_virtio_driver_update_test:
-    type = win_virtio_driver_update_test
+    type = driver_in_use
     only Windows
     monitor_type = qmp
     monitors = qmp1
@@ -12,10 +12,28 @@
     need_enable_verifier = yes
     need_clear_verifier = yes
     driver_install_timeout = 600
+    suppress_exception = no
     tmp_folder = C:\tmp
     guest_alias = "Win7-32:w7\x86,Win7-64:w7\amd64,Win8-32:w8\x86,Win8-64:w8\amd64,Win8.1-32:w8.1\x86,Win8-64.1:w8.1\amd64,Win10-32:w10\x86,Win10-64:w10\amd64,Win2008-32:2k8\x86,Win2008-64:2k8\amd64,Win2012-64:2k12\amd64,Win2012-64r2:2k12R2\amd64"
     driver_install_cmd = "python WIN_UTILS:\win_driver_install.py %s %s %s %s %s"
     show_file_ext_cmd = "reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /v HideFileExt /t REG_DWORD /d 0 /f"
+    read_rng_cmd  = "X:\random_%PROCESSOR_ARCHITECTURE%.exe"
+    sub_test = win_virtio_driver_update_test
+    variants:
+        - uninstall_install:
+            need_uninstall = yes
+        - downgrade_upgrade:
+            need_uninstall = no
+            cdrom_virtio_downgrade = isos/windows/virtio-win-downgrade.iso
+    variants:
+        - before_bg_test:
+            run_bg_flag = "before_bg_test"
+        - during_bg_test:
+            run_bg_flag = "during_bg_test"
+            read_rng_cmd = for /l %i in (1, 1, 1000) do "X:\random_%PROCESSOR_ARCHITECTURE%.exe"
+            suppress_exception = yes
+        - after_bg_test:
+            run_bg_flag = "after_bg_test"
     variants:
         - with_balloon:
             driver_name = balloon
@@ -25,7 +43,7 @@
             driver_name = balloon
             device_name = "VirtIO Balloon Driver"
             driver_id_pattern = "(.*?):.*?VirtIO Balloon Driver"
-            sub_test = balloon_check
+            run_bgstress = balloon_check
             virtio_balloon_pause = 10.0
             free_mem_cmd = cat /proc/meminfo |grep MemFree
             ratio = 0.5
@@ -40,7 +58,7 @@
             nic_model_nic2 = rtl8139
             device_name = "Red Hat VirtIO Ethernet Adapter"
             hostpassword = redhat
-            sub_test = netperf_stress
+            run_bgstress = netperf_stress
             netperf_link = netperf-2.6.0.tar.bz2
             server_path = /var/tmp/
             client_path = /var/tmp/
@@ -55,7 +73,7 @@
         - with_viostor:
             driver_name = viostor
             device_name = "Red Hat VirtIO SCSI controller"
-            sub_test = iozone_windows
+            run_bgstress = iozone_windows
             drive_format_image1 = ide
             images += " stg"
             image_name_stg = "images/storage"
@@ -73,6 +91,7 @@
         - with_vioscsi:
             driver_name = vioscsi
             device_name = "Red Hat VirtIO SCSI pass-through controller"
+            run_bgstress = iozone_windows
             drive_format_image1 = ide
             images += " stg"
             image_name_stg = "images/storage"
@@ -87,9 +106,12 @@
             iozone_cmd = "WIN_UTILS:\Iozone\iozone.exe -azR -r 64k -n 1G -g 2G -M -i 0 -i 1 -b iozone.xls -f ${disk_letter}:\testfile"
             iozone_timeout = 7200
             wait_bg_time = 180
-    variants:
-        - uninstall_install:
-            need_uninstall = yes
-        - downgrade_upgrade:
-            need_uninstall = no
-            cdrom_virtio_downgrade = isos/windows/virtio-win-downgrade.iso
+        - with_viorng:
+            no no_virtio_rng
+            driver_name = viorng
+            device_name = "VirtIO RNG Device"
+            run_bgstress = rng_bat 
+            target_process = random\w*.exe
+            session_cmd_timeout = 240
+            rng_data_rex = "0x\w"
+            driver_id_pattern = "(.*?):.*?VirtIO RNG Device"

qemu/tests/win_virtio_driver_update_test.py

 import logging
 
-from virttest import utils_test
 from virttest import error_context
 from qemu.tests import single_driver_install
 
@@ -24,47 +23,27 @@ def run(test, params, env):
     :param params: Dictionary with the test parameters
     :param env: Dictionary with test environment
     """
-    driver = params["driver_name"]
-    timeout = int(params.get("login_timeout", 360))
-    sub_test = params.get("sub_test")
     cdrom_virtio_downgrade = params.get("cdrom_virtio_downgrade")
 
     vm = env.get_vm(params["main_vm"])
     vm.verify_alive()
-    error_context.context("Boot guest with %s device" % driver, logging.info)
-    session = vm.wait_for_login(timeout=timeout)
-    if params.get("need_enable_verifier", "yes") == "yes":
-        error_context.context("Enable %s driver verifier in guest" % driver,
-                              logging.info)
-        session = utils_test.qemu.setup_win_driver_verifier(session,
-                                                            driver, vm, timeout)
 
-    try:
-        if params.get("need_uninstall") == "yes":
-            error_context.context("Uninstall virtio driver", logging.info)
-            single_driver_install.run(test, params, env)
-            # Need install driver after uninstallation.
-            params["need_uninstall"] = False
-            error_context.context("Install virtio driver", logging.info)
-        else:
-            error_context.context("Downgrade virtio driver", logging.info)
-            new_params = params.copy()
-            new_params["cdrom_virtio"] = cdrom_virtio_downgrade
-            vm.create(params=new_params)
-            vm.verify_alive()
-            single_driver_install.run(test, new_params, env)
-            if sub_test:
-                error_context.context("Run sub test %s" % sub_test, logging.info)
-                utils_test.run_virt_sub_test(test, new_params, env, sub_test)
-            error_context.context("Upgrade virtio driver to original",
-                                  logging.info)
-        vm.create(params=params)
-        vm.verify_alive()
+    if params.get("need_uninstall") == "yes":
+        error_context.context("Uninstall virtio driver", logging.info)
         single_driver_install.run(test, params, env)
-    finally:
-        if params.get("need_clear_verifier", "yes") == "yes":
-            error_context.context("Clear %s driver verifier in guest" % driver,
-                                  logging.info)
-            session = utils_test.qemu.clear_win_driver_verifier(session,
-                                                                vm, timeout)
-        vm.destroy()
+        # Need install driver after uninstallation.
+        params["need_uninstall"] = False
+        error_context.context("Install virtio driver", logging.info)
+    else:
+        error_context.context("Downgrade virtio driver", logging.info)
+        new_params = params.copy()
+        new_params["cdrom_virtio"] = cdrom_virtio_downgrade
+        vm.create(params=new_params)
+        vm.verify_alive()
+        single_driver_install.run(test, new_params, env)
+        error_context.context("Upgrade virtio driver to original",
+                              logging.info)
+    vm.create(params=params)
+    vm.verify_alive()
+    single_driver_install.run(test, params, env)
+    vm.destroy()