add main

vm.py

@@ -125,4 +125,7 @@ def main():
         else:
         else:
             assert False, "unhandled option"
             assert False, "unhandled option"
 
 
-    start_vm(params)
+    start_vm(params)
\ No newline at end of file
+
+if __name__ == "__main__":
+    main()