qdevices: Adapt virtiofsd options

Some options are deprecated since the dedicated virtiofsd package
since rhel9, while before virtiofsd belongs to qemu package.

Signed-off-by: Tingting Mao <[email protected]>

virttest/qemu_devices/qdevices.py

@@ -12,6 +12,7 @@
 import re
 import shutil
 import signal
+import subprocess
 import time
 import traceback
 from collections import OrderedDict
@@ -2259,11 +2260,26 @@ def _handle_log(self, line):
 
     def start_daemon(self):
         """Start the virtiofs daemon in background."""
-        fsd_cmd = "%s --socket-path=%s" % (
-            self.get_param("binary"),
-            self.get_param("sock_path"),
+        virtiofs_binary = self.get_param("binary")
+        socket_path = self.get_param("sock_path")
+        source_dir = self.get_param("source")
+
+        fsd_cmd = f"{virtiofs_binary} --socket-path={socket_path}"
+
+        # capture the capabilities of virtiofsd
+        result = subprocess.check_output(
+            [virtiofs_binary, "--print-capabilities"], universal_newlines=True
         )
-        fsd_cmd += " -o source=%s" % self.get_param("source")
+        virtiofs_cpblt = json.loads(result)
+
+        if (
+            "features" in virtiofs_cpblt
+            and "separate-options" in virtiofs_cpblt["features"]
+        ):
+            fsd_cmd += f" --shared-dir {source_dir}"
+        else:
+            fsd_cmd += f" -o source={source_dir}"
+
         if self.get_param("enable_debug_mode") == "on":
             fsd_cmd += " -d"
             self.set_param("status_active", "Waiting for vhost-user socket connection")