diff --git a/qemu/scripts/qapi-event.py b/qemu/scripts/qapi-event.py
index 601e3076..47dc0418 100644
--- a/qemu/scripts/qapi-event.py
+++ b/qemu/scripts/qapi-event.py
@@ -21,7 +21,7 @@ def _generate_event_api_name(event_name, params):
     l = len(api_name)
 
     if params:
-        for argname, argentry, optional, structured in parse_args(params):
+        for argname, argentry, optional in parse_args(params):
             if optional:
                 api_name += "bool has_%s,\n" % c_var(argname)
                 api_name += "".ljust(l)
@@ -93,7 +93,7 @@ def generate_event_implement(api_name, event_name, params):
 """,
                 event_name = event_name)
 
-        for argname, argentry, optional, structured in parse_args(params):
+        for argname, argentry, optional in parse_args(params):
             if optional:
                 ret += mcgen("""
     if (has_%(var)s) {
diff --git a/qemu/scripts/qapi-types.py b/qemu/scripts/qapi-types.py
index 950a2a9f..0ed06610 100644
--- a/qemu/scripts/qapi-types.py
+++ b/qemu/scripts/qapi-types.py
@@ -63,18 +63,13 @@ typedef struct %(name)sList
 def generate_struct_fields(members):
     ret = ''
 
-    for argname, argentry, optional, structured in parse_args(members):
+    for argname, argentry, optional in parse_args(members):
         if optional:
             ret += mcgen('''
     bool has_%(c_name)s;
 ''',
                          c_name=c_var(argname))
-        if structured:
-            push_indent()
-            ret += generate_struct({ "field": argname, "data": argentry})
-            pop_indent()
-        else:
-            ret += mcgen('''
+        ret += mcgen('''
     %(c_type)s %(c_name)s;
 ''',
                      c_type=c_type(argentry), c_name=c_var(argname))
diff --git a/qemu/scripts/qapi-visit.py b/qemu/scripts/qapi-visit.py
index ea375421..f4132ad4 100644
--- a/qemu/scripts/qapi-visit.py
+++ b/qemu/scripts/qapi-visit.py
@@ -51,27 +51,6 @@ def generate_visit_struct_fields(name, field_prefix, fn_prefix, members, base =
     else:
         full_name = "%s_%s" % (name, fn_prefix)
 
-    for argname, argentry, optional, structured in parse_args(members):
-        if structured:
-            if not fn_prefix:
-                nested_fn_prefix = argname
-            else:
-                nested_fn_prefix = "%s_%s" % (fn_prefix, argname)
-
-            nested_field_prefix = "%s%s." % (field_prefix, argname)
-            ret += generate_visit_struct_fields(name, nested_field_prefix,
-                                                nested_fn_prefix, argentry)
-            ret += mcgen('''
-
-static void visit_type_%(full_name)s_field_%(c_name)s(Visitor *m, %(name)s **obj, Error **errp)
-{
-''',
-                         name=name, full_name=full_name, c_name=c_var(argname))
-            ret += generate_visit_struct_body(full_name, argname, argentry)
-            ret += mcgen('''
-}
-''')
-
     if base:
         ret += generate_visit_implicit_struct(base)
 
@@ -94,7 +73,7 @@ if (err) {
                      c_prefix=c_var(field_prefix),
                      type=type_name(base), c_name=c_var('base'))
 
-    for argname, argentry, optional, structured in parse_args(members):
+    for argname, argentry, optional in parse_args(members):
         if optional:
             ret += mcgen('''
 visit_optional(m, &(*obj)->%(c_prefix)shas_%(c_name)s, "%(name)s", &err);
@@ -104,18 +83,12 @@ if (!err && (*obj)->%(prefix)shas_%(c_name)s) {
                          c_name=c_var(argname), name=argname)
             push_indent()
 
-        if structured:
-            ret += mcgen('''
-visit_type_%(full_name)s_field_%(c_name)s(m, obj, &err);
-''',
-                         full_name=full_name, c_name=c_var(argname))
-        else:
-            ret += mcgen('''
+        ret += mcgen('''
 visit_type_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, "%(name)s", &err);
 ''',
-                         c_prefix=c_var(field_prefix), prefix=field_prefix,
-                         type=type_name(argentry), c_name=c_var(argname),
-                         name=argname)
+                     c_prefix=c_var(field_prefix), prefix=field_prefix,
+                     type=type_name(argentry), c_name=c_var(argname),
+                     name=argname)
 
         if optional:
             pop_indent()
diff --git a/qemu/scripts/qapi.py b/qemu/scripts/qapi.py
index 7aeed91d..bc4f166b 100644
--- a/qemu/scripts/qapi.py
+++ b/qemu/scripts/qapi.py
@@ -373,10 +373,12 @@ def check_type(expr_info, source, value, allow_array = False,
     for (key, arg) in value.items():
         check_name(expr_info, "Member of %s" % source, key,
                    allow_optional=allow_optional)
+        # Todo: allow dictionaries to represent default values of
+        # an optional argument.
         check_type(expr_info, "Member '%s' of %s" % (key, source), arg,
-                   allow_array=True, allow_dict=True, allow_optional=True,
+                   allow_array=True, allow_star=allow_star,
                    allow_metas=['built-in', 'union', 'alternate', 'struct',
-                                'enum'], allow_star=allow_star)
+                                'enum'])
 
 def check_command(expr, expr_info):
     name = expr['command']
@@ -405,14 +407,6 @@ def check_event(expr, expr_info):
                expr.get('data'), allow_dict=True, allow_optional=True,
                allow_metas=['union', 'struct'])
 
-    if params:
-        for argname, argentry, optional, structured in parse_args(params):
-            if structured:
-                raise QAPIExprError(expr_info,
-                                    "Nested structure define in event is not "
-                                    "supported, event '%s', argname '%s'"
-                                    % (expr['event'], argname))
-
 def check_union(expr, expr_info):
     name = expr['union']
     base = expr.get('base')
@@ -671,13 +665,12 @@ def parse_args(typeinfo):
         argname = member
         argentry = typeinfo[member]
         optional = False
-        structured = False
         if member.startswith('*'):
             argname = member[1:]
             optional = True
-        if isinstance(argentry, OrderedDict):
-            structured = True
-        yield (argname, argentry, optional, structured)
+        # Todo: allow argentry to be OrderedDict, for providing the
+        # value of an optional argument.
+        yield (argname, argentry, optional)
 
 def de_camel_case(name):
     new_name = ''