Add rng device hotplug/unplug test

Signed-off-by: NSuqin Huang <shuang@redhat.com>

qemu/tests/cfg/rng_hotplug.cfg

+- rng_hotplug:
+    virt_test_type = qemu
+    type = rng_hotplug
+    monitor_type = qmp
+    monitors = qmp1
+    repeat_times = 1
+    rng_num = 4
+    sub_test_after_hotplug = rng_bat
+    read_rng_timeout = 360
+    Windows:
+        session_cmd_timeout = 240
+        read_rng_cmd  = "X:\random_%PROCESSOR_ARCHITECTURE%.exe"
+        driver_name = "viorng"
+        rng_data_rex = "0x\w"
+    Linux:
+        session_cmd_timeout = 360
+        driver_verifier_cmd = "cat /sys/devices/virtual/misc/hw_random/rng_current"
+        read_rng_cmd  = "dd if=/dev/hwrng  bs=1 count=10 2>/dev/null|hexdump"
+        driver_name = "virtio"
+        rng_data_rex = "\w+"
+    

qemu/tests/rng_hotplug.py

+import logging
+import time
+
+from virttest import error_context
+from virttest.qemu_devices import qdevices
+from virttest import utils_test
+from avocado.core import exceptions
+
+
+@error_context.context_aware
+def run(test, params, env):
+    """
+    Test hotplug/unplug of rng device
+    1) Boot up w/o rng device
+    2) Hotplug one or more rng devices
+    3) Run random read test after hotplug
+    4) Unplug rng devices
+    5) Repeat step 2 ~ step4 (option)
+
+
+    :param test: QEMU test object
+    :param params: Dictionary with the test parameters
+    :param env: Dictionary with test environment
+    """
+
+    login_timeout = int(params.get("login_timeout", 360))
+    repeat_times = int(params.get("repeat_times", 1))
+    rng_num = int(params.get("rng_num", 1))
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    vm.wait_for_login(timeout=login_timeout)
+
+    for i in xrange(repeat_times):
+        dev_list = []
+        logging.info("Hotplug/unplug rng devices the %sth times", (i+1))
+
+        for num in xrange(rng_num):
+            vm.devices.set_dirty()
+            new_dev = qdevices.QDevice("virtio-rng-pci",
+                                       {'id': 'virtio-rng-pci-%d' % num})
+            dev_list.append(new_dev)
+            error_context.context("Hotplug %s" % new_dev, logging.info)
+            output = new_dev.hotplug(vm.monitor)
+            time.sleep(2)
+
+            error_context.context("Check %sfrom qtree after hotplug" % new_dev,
+                                  logging.info)
+            qtree_output = new_dev.verify_hotplug(output, vm.monitor)
+            if not qtree_output:
+                msg = "no % device in qtree after hotplug"
+                msg += "the %sth time" % (new_dev, i)
+                raise exceptions.TestFail(msg)
+            logging.info("virtio-rng-pci-%d is hotpluged successfully" % num)
+        sub_test = params.get("sub_test_after_hotplug")
+        if sub_test:
+            utils_test.run_virt_sub_test(test, params, env, sub_test)
+
+        for dev in dev_list:
+            error_context.context("Unplug %s" % dev, logging.info)
+            output = dev.unplug(vm.monitor)
+            time.sleep(2)
+
+            error_context.context("Check rng device from qtree after unplug",
+                                  logging.info)
+            qtree_output = dev.verify_unplug(output, vm.monitor)
+            if not qtree_output:
+                msg = "Still get %s in qtree after unplug %s times" % (dev, i)
+                raise exceptions.TestFail(msg)
+            logging.info("%s is unpluged successfully" % dev)