Netkvm: Fix session handling issue during netkvm driver installation

Installing the netkvm driver on an existing network interface caused
session handling issues, leading to test failures. This patch changes
the session handling from SSH to the serial session by replacing
vm.wait_for_login() with vm.wait_for_serial_login(). It also adds a ping
test to verify network connectivity after the driver installation.

Signed-off-by: wji <[email protected]>

qemu/tests/single_driver_install.py

@@ -5,6 +5,7 @@
 
 from virttest import error_context
 from virttest import utils_misc
+from virttest import utils_net
 from virttest.utils_windows import virtio_win, wmic
 from virttest.utils_test.qemu import windrv_verify_running
 
@@ -144,7 +145,8 @@ def run(test, params, env):
             vm.destroy()
             vm.create()
             vm = env.get_vm(params["main_vm"])
-            session = vm.wait_for_login()
+            # This is a workaround for session logout issue
+            session = vm.wait_for_serial_login()
         else:
             session = vm.reboot(session)
 
@@ -172,6 +174,15 @@ def run(test, params, env):
         if not utils_misc.wait_for(lambda: not session.cmd_status(chk_cmd),
                                    600, 60, 10):
             test.fail("Failed to install driver '%s'" % driver_name)
+        if device_name[0:30] == "Red Hat VirtIO Ethernet Adapte":
+            ext_host = utils_net.get_ip_address_by_interface(ifname="%s" % params.get("netdst"))
+            test.log.info("ext_host of netkvm adapter is %s" % ext_host)
+            guest_ip = vm.get_address("nic2")
+            test.log.info("guest_ip of netkvm adapter is %s" % guest_ip)
+            status, output = utils_net.ping(
+                ext_host, interface=guest_ip, count=10, timeout=60, session=session)
+            if status:
+                test.fail("Ping %s failed, output=%s" % (ext_host, output))
 
         installed_any |= True
     if not installed_any: