virtio_fs_support_win_fs: wait some time for 7z.exe up

1. wait virtiofs service start after reboot system
2. wait for 7zip process up

Signed-off-by: Xiaoling Gao <[email protected]>

Author: xiagao

qemu/tests/virtio_fs_support_win_fs.py

@@ -1,3 +1,6 @@
+import re
+import time
+
 from virttest import error_context, utils_misc, utils_test
 
 from provider import virtio_fs_utils
@@ -69,13 +72,36 @@ def run(test, params, env):
     session.cmd(reg_add_pwd)
     error_context.context("Reboot the guest.", test.log.info)
     session = vm.reboot(session)
+
     error_context.context(
         "Run autoit script to install executable in explorer.", test.log.info
     )
+    # wait several seconds to virtiofs startup
+    if not utils_misc.wait_for(
+            lambda: re.search(
+                r"RUNNING", virtio_fs_utils.query_viofs_service(test, params, session)
+            ),
+            60, 0, 5
+    ):
+        test.error("Virtiofs service wasn't start after vm reboot.")
+
     session.cmd("start /w " + autoIt_path + " " + script_path)
     exe_name = winutils_pack_path.encode("unicode_escape").decode()[4:]
-    output = session.cmd_output("tasklist -v | findstr %s" % exe_name)
-    test.log.info("The process found: %s", output)
+
+    check_timeout = 60
+    end_time = time.time() + check_timeout
+    while time.time() < end_time:
+        output = session.cmd_output(
+            "tasklist -v | findstr %s" % exe_name
+        ).strip()
+        test.log.info(f"output is {output}")
+        if output != "":
+            break
+    else:
+        test.error(
+            f"Volume is not ready for io within {check_timeout}."
+        )
+
     output_lower = output.lower()
     if "7-zip" in output_lower and "setup" in output_lower:
         test.log.info(