Netkvm: Fix session handling issue during netkvm driver installation

During acceptance testing, 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 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 +145,7 @@ def run(test, params, env):
             vm.destroy()
             vm.create()
             vm = env.get_vm(params["main_vm"])
-            session = vm.wait_for_login()
+            session = vm.wait_for_serial_login()  # This is a workaround.
         else:
             session = vm.reboot(session)
 
@@ -172,6 +173,15 @@ 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 adapte is %s" % ext_host)
+            guest_ip = vm.get_address("nic2")
+            test.log.info("guest_ip of netkvm adapte 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: