QOM infrastructure fixes and device conversions

* Changes to name string ownership for alias properties
 * Improvements around enum properties
 * Cleanups around -object handling
 * New helper functions
 * Cleanups of qdev init helper functions
 * Add path argument to qom-tree script
 * QTest cleanup to use new qtest_add_data_func() consistently
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Merge remote-tracking branch 'remotes/afaerber/tags/qom-devices-for-peter' into staging

QOM infrastructure fixes and device conversions

* Changes to name string ownership for alias properties
* Improvements around enum properties
* Cleanups around -object handling
* New helper functions
* Cleanups of qdev init helper functions
* Add path argument to qom-tree script
* QTest cleanup to use new qtest_add_data_func() consistently

# gpg: Signature made Fri Jun 19 18:14:38 2015 BST using RSA key ID 3E7E013F
# gpg: Good signature from "Andreas Färber <afaerber@suse.de>"
# gpg:                 aka "Andreas Färber <afaerber@suse.com>"

* remotes/afaerber/tags/qom-devices-for-peter:
  qdev: Un-deprecate qdev_init_nofail()
  qdev: Deprecated qdev_init() is finally unused, drop
  qom: Don't pass string table to object_get_enum() function
  qom: Add an object_property_add_enum() helper function
  qom: Make enum string tables const-correct
  qom: Add object_new_with_props() / object_new_withpropv() helpers
  qom: Add helper function for getting user objects root
  vl: Create (most) objects before creating chardev backends
  doc: Document user creatable object types in help text
  backends: Fix typename of 'policy' enum property in hostmem obj
  scripts: Add support for path as argument of qom-tree
  tests: Use qtest_add_data_func() consistently
  qdev: Free property names after registering gpio aliases
  qom: strdup() target property name on object_property_add_alias()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

backends/hostmem.c

@@ -113,24 +113,17 @@ host_memory_backend_set_host_nodes(Object *obj, Visitor *v, void *opaque,
 #endif
 }
 
-static void
+static int
-host_memory_backend_get_policy(Object *obj, Visitor *v, void *opaque,
+host_memory_backend_get_policy(Object *obj, Error **errp G_GNUC_UNUSED)
-                               const char *name, Error **errp)
 {
     HostMemoryBackend *backend = MEMORY_BACKEND(obj);
-    int policy = backend->policy;
+    return backend->policy;
-
-    visit_type_enum(v, &policy, HostMemPolicy_lookup, NULL, name, errp);
 }
 
 static void
-host_memory_backend_set_policy(Object *obj, Visitor *v, void *opaque,
+host_memory_backend_set_policy(Object *obj, int policy, Error **errp)
-                               const char *name, Error **errp)
 {
     HostMemoryBackend *backend = MEMORY_BACKEND(obj);
-    int policy;
-
-    visit_type_enum(v, &policy, HostMemPolicy_lookup, NULL, name, errp);
     backend->policy = policy;
 
 #ifndef CONFIG_NUMA
@@ -252,9 +245,10 @@ static void host_memory_backend_init(Object *obj)
     object_property_add(obj, "host-nodes", "int",
                         host_memory_backend_get_host_nodes,
                         host_memory_backend_set_host_nodes, NULL, NULL, NULL);
-    object_property_add(obj, "policy", "str",
+    object_property_add_enum(obj, "policy", "HostMemPolicy",
+                             HostMemPolicy_lookup,
                              host_memory_backend_get_policy,
-                        host_memory_backend_set_policy, NULL, NULL, NULL);
+                             host_memory_backend_set_policy, NULL);
 }
 
 MemoryRegion *

hw/core/qdev.c

@@ -126,9 +126,9 @@ void qbus_set_bus_hotplug_handler(BusState *bus, Error **errp)
     qbus_set_hotplug_handler_internal(bus, OBJECT(bus), errp);
 }
 
-/* Create a new device.  This only initializes the device state structure
+/* Create a new device.  This only initializes the device state
-   and allows properties to be set.  qdev_init should be called to
+   structure and allows properties to be set.  The device still needs
-   initialize the actual device emulation.  */
+   to be realized.  See qdev-core.h.  */
 DeviceState *qdev_create(BusState *bus, const char *name)
 {
     DeviceState *dev;
@@ -168,27 +168,6 @@ DeviceState *qdev_try_create(BusState *bus, const char *type)
     return dev;
 }
 
-/* Initialize a device.  Device properties should be set before calling
-   this function.  IRQs and MMIO regions should be connected/mapped after
-   calling this function.
-   On failure, destroy the device and return negative value.
-   Return 0 on success.  */
-int qdev_init(DeviceState *dev)
-{
-    Error *local_err = NULL;
-
-    assert(!dev->realized);
-
-    object_property_set_bool(OBJECT(dev), true, "realized", &local_err);
-    if (local_err != NULL) {
-        qerror_report_err(local_err);
-        error_free(local_err);
-        object_unparent(OBJECT(dev));
-        return -1;
-    }
-    return 0;
-}
-
 static QTAILQ_HEAD(device_listeners, DeviceListener) device_listeners
     = QTAILQ_HEAD_INITIALIZER(device_listeners);
 
@@ -364,13 +343,19 @@ void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev,
     object_unparent(OBJECT(dev));
 }
 
-/* Like qdev_init(), but terminate program via error_report() instead of
+/*
-   returning an error value.  This is okay during machine creation.
+ * Realize @dev.
-   Don't use for hotplug, because there callers need to recover from
+ * Device properties should be set before calling this function.  IRQs
-   failure.  Exception: if you know the device's init() callback can't
+ * and MMIO regions should be connected/mapped after calling this
-   fail, then qdev_init_nofail() can't fail either, and is therefore
+ * function.
-   usable even then.  But relying on the device implementation that
+ * On failure, report an error with error_report() and terminate the
-   way is somewhat unclean, and best avoided.  */
+ * program.  This is okay during machine creation.  Don't use for
+ * hotplug, because there callers need to recover from failure.
+ * Exception: if you know the device's init() callback can't fail,
+ * then qdev_init_nofail() can't fail either, and is therefore usable
+ * even then.  But relying on the device implementation that way is
+ * somewhat unclean, and best avoided.
+ */
 void qdev_init_nofail(DeviceState *dev)
 {
     Error *err = NULL;
@@ -563,6 +548,7 @@ void qdev_pass_gpios(DeviceState *dev, DeviceState *container,
         object_property_add_alias(OBJECT(container), propname,
                                   OBJECT(dev), propname,
                                   &error_abort);
+        g_free(propname);
     }
     for (i = 0; i < ngl->num_out; i++) {
         const char *nm = ngl->name ? ngl->name : "unnamed-gpio-out";
@@ -571,6 +557,7 @@ void qdev_pass_gpios(DeviceState *dev, DeviceState *container,
         object_property_add_alias(OBJECT(container), propname,
                                   OBJECT(dev), propname,
                                   &error_abort);
+        g_free(propname);
     }
     QLIST_REMOVE(ngl, node);
     QLIST_INSERT_HEAD(&container->gpios, ngl, node);

include/hw/qdev-core.h

@@ -65,8 +65,8 @@ struct VMStateDescription;
  * Operations depending on @props static properties should go into @realize.
  * After successful realization, setting static properties will fail.
  *
- * As an interim step, the #DeviceState:realized property is set by deprecated
+ * As an interim step, the #DeviceState:realized property can also be
- * functions qdev_init() and qdev_init_nofail().
+ * set with qdev_init_nofail().
  * In the future, devices will propagate this state change to their children
  * and along busses they expose.
  * The point in time will be deferred to machine creation, so that values
@@ -236,7 +236,7 @@ struct Property {
 struct PropertyInfo {
     const char *name;
     const char *description;
-    const char **enum_table;
+    const char * const *enum_table;
     int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
     ObjectPropertyAccessor *get;
     ObjectPropertyAccessor *set;
@@ -262,7 +262,6 @@ typedef struct GlobalProperty {
 
 DeviceState *qdev_create(BusState *bus, const char *name);
 DeviceState *qdev_try_create(BusState *bus, const char *name);
-int qdev_init(DeviceState *dev) QEMU_WARN_UNUSED_RESULT;
 void qdev_init_nofail(DeviceState *dev);
 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
                                  int required_for_version);

include/qapi/util.h

@@ -11,7 +11,7 @@
 #ifndef QAPI_UTIL_H
 #define QAPI_UTIL_H
 
-int qapi_enum_parse(const char *lookup[], const char *buf,
+int qapi_enum_parse(const char * const lookup[], const char *buf,
                     int max, int def, Error **errp);
 
 #endif

include/qapi/visitor-impl.h

@@ -30,7 +30,7 @@ struct Visitor
     GenericList *(*next_list)(Visitor *v, GenericList **list, Error **errp);
     void (*end_list)(Visitor *v, Error **errp);
 
-    void (*type_enum)(Visitor *v, int *obj, const char *strings[],
+    void (*type_enum)(Visitor *v, int *obj, const char * const strings[],
                       const char *kind, const char *name, Error **errp);
     void (*get_next_type)(Visitor *v, int *kind, const int *qobjects,
                           const char *name, Error **errp);
@@ -59,9 +59,9 @@ struct Visitor
     void (*end_union)(Visitor *v, bool data_present, Error **errp);
 };
 
-void input_type_enum(Visitor *v, int *obj, const char *strings[],
+void input_type_enum(Visitor *v, int *obj, const char * const strings[],
                      const char *kind, const char *name, Error **errp);
-void output_type_enum(Visitor *v, int *obj, const char *strings[],
+void output_type_enum(Visitor *v, int *obj, const char * const strings[],
                       const char *kind, const char *name, Error **errp);
 
 #endif

include/qapi/visitor.h

@@ -43,7 +43,7 @@ void visit_optional(Visitor *v, bool *present, const char *name,
                     Error **errp);
 void visit_get_next_type(Visitor *v, int *obj, const int *qtypes,
                          const char *name, Error **errp);
-void visit_type_enum(Visitor *v, int *obj, const char *strings[],
+void visit_type_enum(Visitor *v, int *obj, const char * const strings[],
                      const char *kind, const char *name, Error **errp);
 void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp);
 void visit_type_uint8(Visitor *v, uint8_t *obj, const char *name, Error **errp);

include/qemu/compiler.h

@@ -24,6 +24,12 @@
 #define QEMU_WARN_UNUSED_RESULT
 #endif
 
+#if QEMU_GNUC_PREREQ(4, 0)
+#define QEMU_SENTINEL __attribute__((sentinel))
+#else
+#define QEMU_SENTINEL
+#endif
+
 #if QEMU_GNUC_PREREQ(4, 3)
 #define QEMU_ARTIFICIAL __attribute__((always_inline, artificial))
 #else

include/qom/object.h

@@ -606,6 +606,134 @@ Object *object_new(const char *typename);
  */
 Object *object_new_with_type(Type type);
 
+/**
+ * object_new_with_props:
+ * @typename:  The name of the type of the object to instantiate.
+ * @parent: the parent object
+ * @id: The unique ID of the object
+ * @errp: pointer to error object
+ * @...: list of property names and values
+ *
+ * This function will initialize a new object using heap allocated memory.
+ * The returned object has a reference count of 1, and will be freed when
+ * the last reference is dropped.
+ *
+ * The @id parameter will be used when registering the object as a
+ * child of @parent in the composition tree.
+ *
+ * The variadic parameters are a list of pairs of (propname, propvalue)
+ * strings. The propname of %NULL indicates the end of the property
+ * list. If the object implements the user creatable interface, the
+ * object will be marked complete once all the properties have been
+ * processed.
+ *
+ * <example>
+ *   <title>Creating an object with properties</title>
+ *   <programlisting>
+ *   Error *err = NULL;
+ *   Object *obj;
+ *
+ *   obj = object_new_with_props(TYPE_MEMORY_BACKEND_FILE,
+ *                               object_get_objects_root(),
+ *                               "hostmem0",
+ *                               &err,
+ *                               "share", "yes",
+ *                               "mem-path", "/dev/shm/somefile",
+ *                               "prealloc", "yes",
+ *                               "size", "1048576",
+ *                               NULL);
+ *
+ *   if (!obj) {
+ *     g_printerr("Cannot create memory backend: %s\n",
+ *                error_get_pretty(err));
+ *   }
+ *   </programlisting>
+ * </example>
+ *
+ * The returned object will have one stable reference maintained
+ * for as long as it is present in the object hierarchy.
+ *
+ * Returns: The newly allocated, instantiated & initialized object.
+ */
+Object *object_new_with_props(const char *typename,
+                              Object *parent,
+                              const char *id,
+                              Error **errp,
+                              ...) QEMU_SENTINEL;
+
+/**
+ * object_new_with_propv:
+ * @typename:  The name of the type of the object to instantiate.
+ * @parent: the parent object
+ * @id: The unique ID of the object
+ * @errp: pointer to error object
+ * @vargs: list of property names and values
+ *
+ * See object_new_with_props() for documentation.
+ */
+Object *object_new_with_propv(const char *typename,
+                              Object *parent,
+                              const char *id,
+                              Error **errp,
+                              va_list vargs);
+
+/**
+ * object_set_props:
+ * @obj: the object instance to set properties on
+ * @errp: pointer to error object
+ * @...: list of property names and values
+ *
+ * This function will set a list of properties on an existing object
+ * instance.
+ *
+ * The variadic parameters are a list of pairs of (propname, propvalue)
+ * strings. The propname of %NULL indicates the end of the property
+ * list.
+ *
+ * <example>
+ *   <title>Update an object's properties</title>
+ *   <programlisting>
+ *   Error *err = NULL;
+ *   Object *obj = ...get / create object...;
+ *
+ *   obj = object_set_props(obj,
+ *                          &err,
+ *                          "share", "yes",
+ *                          "mem-path", "/dev/shm/somefile",
+ *                          "prealloc", "yes",
+ *                          "size", "1048576",
+ *                          NULL);
+ *
+ *   if (!obj) {
+ *     g_printerr("Cannot set properties: %s\n",
+ *                error_get_pretty(err));
+ *   }
+ *   </programlisting>
+ * </example>
+ *
+ * The returned object will have one stable reference maintained
+ * for as long as it is present in the object hierarchy.
+ *
+ * Returns: -1 on error, 0 on success
+ */
+int object_set_props(Object *obj,
+                     Error **errp,
+                     ...) QEMU_SENTINEL;
+
+/**
+ * object_set_propv:
+ * @obj: the object instance to set properties on
+ * @errp: pointer to error object
+ * @vargs: list of property names and values
+ *
+ * See object_set_props() for documentation.
+ *
+ * Returns: -1 on error, 0 on success
+ */
+int object_set_propv(Object *obj,
+                     Error **errp,
+                     va_list vargs);
+
 /**
  * object_initialize_with_type:
  * @data: A pointer to the memory to be used for the object.
@@ -945,7 +1073,7 @@ int64_t object_property_get_int(Object *obj, const char *name,
  * object_property_get_enum:
  * @obj: the object
  * @name: the name of the property
- * @strings: strings corresponding to enums
+ * @typename: the name of the enum data type
  * @errp: returns an error if this function fails
  *
  * Returns: the value of the property, converted to an integer, or
@@ -953,7 +1081,7 @@ int64_t object_property_get_int(Object *obj, const char *name,
  * an enum).
  */
 int object_property_get_enum(Object *obj, const char *name,
-                             const char *strings[], Error **errp);
+                             const char *typename, Error **errp);
 
 /**
  * object_property_get_uint16List:
@@ -1026,6 +1154,18 @@ const char *object_property_get_type(Object *obj, const char *name,
  */
 Object *object_get_root(void);
 
+
+/**
+ * object_get_objects_root:
+ *
+ * Get the container object that holds user created
+ * object instances. This is the object at path
+ * "/objects"
+ *
+ * Returns: the user object container
+ */
+Object *object_get_objects_root(void);
+
 /**
  * object_get_canonical_path_component:
  *
@@ -1203,6 +1343,25 @@ void object_property_add_bool(Object *obj, const char *name,
                               void (*set)(Object *, bool, Error **),
                               Error **errp);
 
+/**
+ * object_property_add_enum:
+ * @obj: the object to add a property to
+ * @name: the name of the property
+ * @typename: the name of the enum data type
+ * @get: the getter or %NULL if the property is write-only.
+ * @set: the setter or %NULL if the property is read-only
+ * @errp: if an error occurs, a pointer to an area to store the error
+ *
+ * Add an enum property using getters/setters.  This function will add a
+ * property of type '@typename'.
+ */
+void object_property_add_enum(Object *obj, const char *name,
+                              const char *typename,
+                              const char * const *strings,
+                              int (*get)(Object *, Error **),
+                              void (*set)(Object *, int, Error **),
+                              Error **errp);
+
 /**
  * object_property_add_tm:
  * @obj: the object to add a property to

iothread.c

@@ -19,8 +19,6 @@
 #include "qmp-commands.h"
 #include "qemu/error-report.h"
 
-#define IOTHREADS_PATH "/objects"
-
 typedef ObjectClass IOThreadClass;
 
 #define IOTHREAD_GET_CLASS(obj) \
@@ -160,7 +158,7 @@ IOThreadInfoList *qmp_query_iothreads(Error **errp)
 {
     IOThreadInfoList *head = NULL;
     IOThreadInfoList **prev = &head;
-    Object *container = container_get(object_get_root(), IOTHREADS_PATH);
+    Object *container = object_get_objects_root();
 
     object_child_foreach(container, query_one_iothread, &prev);
     return head;

numa.c

@@ -456,7 +456,7 @@ static int query_memdev(Object *obj, void *opaque)
 
         m->value->policy = object_property_get_enum(obj,
                                                     "policy",
-                                                    HostMemPolicy_lookup,
+                                                    "HostMemPolicy",
                                                     &err);
         if (err) {
             goto error;
@@ -485,7 +485,7 @@ MemdevList *qmp_query_memdev(Error **errp)
     Object *obj;
     MemdevList *list = NULL;
 
-    obj = object_resolve_path("/objects", NULL);
+    obj = object_get_objects_root();
     if (obj == NULL) {
         return NULL;
     }

qapi/qapi-dealloc-visitor.c

@@ -156,7 +156,8 @@ static void qapi_dealloc_type_size(Visitor *v, uint64_t *obj, const char *name,
 {
 }
 
-static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *strings[],
+static void qapi_dealloc_type_enum(Visitor *v, int *obj,
+                                   const char * const strings[],
                                    const char *kind, const char *name,
                                    Error **errp)
 {

qapi/qapi-util.c

@@ -14,7 +14,7 @@
 #include "qapi/error.h"
 #include "qapi/util.h"
 
-int qapi_enum_parse(const char *lookup[], const char *buf,
+int qapi_enum_parse(const char * const lookup[], const char *buf,
                     int max, int def, Error **errp)
 {
     int i;

qapi/qapi-visit-core.c

@@ -89,7 +89,7 @@ void visit_get_next_type(Visitor *v, int *obj, const int *qtypes,
     }
 }
 
-void visit_type_enum(Visitor *v, int *obj, const char *strings[],
+void visit_type_enum(Visitor *v, int *obj, const char * const strings[],
                      const char *kind, const char *name, Error **errp)
 {
     v->type_enum(v, obj, strings, kind, name, errp);
@@ -260,7 +260,7 @@ void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp)
     v->type_number(v, obj, name, errp);
 }
 
-void output_type_enum(Visitor *v, int *obj, const char *strings[],
+void output_type_enum(Visitor *v, int *obj, const char * const strings[],
                       const char *kind, const char *name,
                       Error **errp)
 {
@@ -279,7 +279,7 @@ void output_type_enum(Visitor *v, int *obj, const char *strings[],
     visit_type_str(v, &enum_str, name, errp);
 }
 
-void input_type_enum(Visitor *v, int *obj, const char *strings[],
+void input_type_enum(Visitor *v, int *obj, const char * const strings[],
                      const char *kind, const char *name,
                      Error **errp)
 {

qemu-options.hx

@@ -3487,22 +3487,6 @@ DEF("no-kvm-irqchip", 0, QEMU_OPTION_no_kvm_irqchip, "", QEMU_ARCH_I386)
 HXCOMM Deprecated (ignored)
 DEF("tdf", 0, QEMU_OPTION_tdf,"", QEMU_ARCH_ALL)
 
-DEF("object", HAS_ARG, QEMU_OPTION_object,
-    "-object TYPENAME[,PROP1=VALUE1,...]\n"
-    "                create an new object of type TYPENAME setting properties\n"
-    "                in the order they are specified.  Note that the 'id'\n"
-    "                property must be set.  These objects are placed in the\n"
-    "                '/objects' path.\n",
-    QEMU_ARCH_ALL)
-STEXI
-@item -object @var{typename}[,@var{prop1}=@var{value1},...]
-@findex -object
-Create an new object of type @var{typename} setting properties
-in the order they are specified.  Note that the 'id'
-property must be set.  These objects are placed in the
-'/objects' path.
-ETEXI
-
 DEF("msg", HAS_ARG, QEMU_OPTION_msg,
     "-msg timestamp[=on|off]\n"
     "                change the format of messages\n"
@@ -3528,6 +3512,60 @@ Dump json-encoded vmstate information for current machine type to file
 in @var{file}
 ETEXI
 
+DEFHEADING(Generic object creation)
+
+DEF("object", HAS_ARG, QEMU_OPTION_object,
+    "-object TYPENAME[,PROP1=VALUE1,...]\n"
+    "                create a new object of type TYPENAME setting properties\n"
+    "                in the order they are specified.  Note that the 'id'\n"
+    "                property must be set.  These objects are placed in the\n"
+    "                '/objects' path.\n",
+    QEMU_ARCH_ALL)
+STEXI
+@item -object @var{typename}[,@var{prop1}=@var{value1},...]
+@findex -object
+Create a new object of type @var{typename} setting properties
+in the order they are specified.  Note that the 'id'
+property must be set.  These objects are placed in the
+'/objects' path.
+
+@table @option
+
+@item -object memory-backend-file,id=@var{id},size=@var{size},mem-path=@var{dir},share=@var{on|off}
+
+Creates a memory file backend object, which can be used to back
+the guest RAM with huge pages. The @option{id} parameter is a
+unique ID that will be used to reference this memory region
+when configuring the @option{-numa} argument. The @option{size}
+option provides the size of the memory region, and accepts
+common suffixes, eg @option{500M}. The @option{mem-path} provides
+the path to either a shared memory or huge page filesystem mount.
+The @option{share} boolean option determines whether the memory
+region is marked as private to QEMU, or shared. The latter allows
+a co-operating external process to access the QEMU memory region.
+
+@item -object rng-random,id=@var{id},filename=@var{/dev/random}
+
+Creates a random number generator backend which obtains entropy from
+a device on the host. The @option{id} parameter is a unique ID that
+will be used to reference this entropy backend from the @option{virtio-rng}
+device. The @option{filename} parameter specifies which file to obtain
+entropy from and if omitted defaults to @option{/dev/random}.
+
+@item -object rng-egd,id=@var{id},chardev=@var{chardevid}
+
+Creates a random number generator backend which obtains entropy from
+an external daemon running on the host. The @option{id} parameter is
+a unique ID that will be used to reference this entropy backend from
+the @option{virtio-rng} device. The @option{chardev} parameter is
+the unique ID of a character device backend that provides the connection
+to the RNG daemon.
+
+@end table
+
+ETEXI
+
+
 HXCOMM This is the last statement. Insert new options before this line!
 STEXI
 @end table

qmp.c

@@ -651,7 +651,7 @@ void object_add(const char *type, const char *id, const QDict *qdict,
         }
     }
 
-    object_property_add_child(container_get(object_get_root(), "/objects"),
+    object_property_add_child(object_get_objects_root(),
                               id, obj, &local_err);
     if (local_err) {
         goto out;
@@ -659,7 +659,7 @@ void object_add(const char *type, const char *id, const QDict *qdict,
 
     user_creatable_complete(obj, &local_err);
     if (local_err) {
-        object_property_del(container_get(object_get_root(), "/objects"),
+        object_property_del(object_get_objects_root(),
                             id, &error_abort);
         goto out;
     }
@@ -706,7 +706,7 @@ void qmp_object_del(const char *id, Error **errp)
     Object *container;
     Object *obj;
 
-    container = container_get(object_get_root(), "/objects");
+    container = object_get_objects_root();
     obj = object_resolve_path_component(container, id);
     if (!obj) {
         error_setg(errp, "object id not found");

qom/object.c

@@ -11,6 +11,7 @@
  */
 
 #include "qom/object.h"
+#include "qom/object_interfaces.h"
 #include "qemu-common.h"
 #include "qapi/visitor.h"
 #include "qapi-visit.h"
@@ -439,6 +440,114 @@ Object *object_new(const char *typename)
     return object_new_with_type(ti);
 }
 
+
+Object *object_new_with_props(const char *typename,
+                              Object *parent,
+                              const char *id,
+                              Error **errp,
+                              ...)
+{
+    va_list vargs;
+    Object *obj;
+
+    va_start(vargs, errp);
+    obj = object_new_with_propv(typename, parent, id, errp, vargs);
+    va_end(vargs);
+
+    return obj;
+}
+
+
+Object *object_new_with_propv(const char *typename,
+                              Object *parent,
+                              const char *id,
+                              Error **errp,
+                              va_list vargs)
+{
+    Object *obj;
+    ObjectClass *klass;
+    Error *local_err = NULL;
+
+    klass = object_class_by_name(typename);
+    if (!klass) {
+        error_setg(errp, "invalid object type: %s", typename);
+        return NULL;
+    }
+
+    if (object_class_is_abstract(klass)) {
+        error_setg(errp, "object type '%s' is abstract", typename);
+        return NULL;
+    }
+    obj = object_new(typename);
+
+    if (object_set_propv(obj, &local_err, vargs) < 0) {
+        goto error;
+    }
+
+    object_property_add_child(parent, id, obj, &local_err);
+    if (local_err) {
+        goto error;
+    }
+
+    if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
+        user_creatable_complete(obj, &local_err);
+        if (local_err) {
+            object_unparent(obj);
+            goto error;
+        }
+    }
+
+    object_unref(OBJECT(obj));
+    return obj;
+
+ error:
+    if (local_err) {
+        error_propagate(errp, local_err);
+    }
+    object_unref(obj);
+    return NULL;
+}
+
+
+int object_set_props(Object *obj,
+                     Error **errp,
+                     ...)
+{
+    va_list vargs;
+    int ret;
+
+    va_start(vargs, errp);
+    ret = object_set_propv(obj, errp, vargs);
+    va_end(vargs);
+
+    return ret;
+}
+
+
+int object_set_propv(Object *obj,
+                     Error **errp,
+                     va_list vargs)
+{
+    const char *propname;
+    Error *local_err = NULL;
+
+    propname = va_arg(vargs, char *);
+    while (propname != NULL) {
+        const char *value = va_arg(vargs, char *);
+
+        g_assert(value != NULL);
+        object_property_parse(obj, value, propname, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+            return -1;
+        }
+        propname = va_arg(vargs, char *);
+    }
+
+    return 0;
+}
+
+
 Object *object_dynamic_cast(Object *obj, const char *typename)
 {
     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
@@ -960,13 +1069,34 @@ int64_t object_property_get_int(Object *obj, const char *name,
     return retval;
 }
 
+typedef struct EnumProperty {
+    const char * const *strings;
+    int (*get)(Object *, Error **);
+    void (*set)(Object *, int, Error **);
+} EnumProperty;
+
 int object_property_get_enum(Object *obj, const char *name,
-                             const char *strings[], Error **errp)
+                             const char *typename, Error **errp)
 {
     StringOutputVisitor *sov;
     StringInputVisitor *siv;
     char *str;
     int ret;
+    ObjectProperty *prop = object_property_find(obj, name, errp);
+    EnumProperty *enumprop;
+
+    if (prop == NULL) {
+        return 0;
+    }
+
+    if (!g_str_equal(prop->type, typename)) {
+        error_setg(errp, "Property %s on %s is not '%s' enum type",
+                   name, object_class_get_name(
+                       object_get_class(obj)), typename);
+        return 0;
+    }
+
+    enumprop = prop->opaque;
 
     sov = string_output_visitor_new(false);
     object_property_get(obj, string_output_get_visitor(sov), name, errp);
@@ -974,7 +1104,7 @@ int object_property_get_enum(Object *obj, const char *name,
     siv = string_input_visitor_new(str);
     string_output_visitor_cleanup(sov);
     visit_type_enum(string_input_get_visitor(siv),
-                    &ret, strings, NULL, name, errp);
+                    &ret, enumprop->strings, NULL, name, errp);
 
     g_free(str);
     string_input_visitor_cleanup(siv);
@@ -1054,6 +1184,11 @@ Object *object_get_root(void)
     return root;
 }
 
+Object *object_get_objects_root(void)
+{
+    return container_get(object_get_root(), "/objects");
+}
+
 static void object_get_child_property(Object *obj, Visitor *v, void *opaque,
                                       const char *name, Error **errp)
 {
@@ -1559,6 +1694,58 @@ void object_property_add_bool(Object *obj, const char *name,
     }
 }
 
+static void property_get_enum(Object *obj, Visitor *v, void *opaque,
+                              const char *name, Error **errp)
+{
+    EnumProperty *prop = opaque;
+    int value;
+
+    value = prop->get(obj, errp);
+    visit_type_enum(v, &value, prop->strings, NULL, name, errp);
+}
+
+static void property_set_enum(Object *obj, Visitor *v, void *opaque,
+                              const char *name, Error **errp)
+{
+    EnumProperty *prop = opaque;
+    int value;
+
+    visit_type_enum(v, &value, prop->strings, NULL, name, errp);
+    prop->set(obj, value, errp);
+}
+
+static void property_release_enum(Object *obj, const char *name,
+                                  void *opaque)
+{
+    EnumProperty *prop = opaque;
+    g_free(prop);
+}
+
+void object_property_add_enum(Object *obj, const char *name,
+                              const char *typename,
+                              const char * const *strings,
+                              int (*get)(Object *, Error **),
+                              void (*set)(Object *, int, Error **),
+                              Error **errp)
+{
+    Error *local_err = NULL;
+    EnumProperty *prop = g_malloc(sizeof(*prop));
+
+    prop->strings = strings;
+    prop->get = get;
+    prop->set = set;
+
+    object_property_add(obj, name, typename,
+                        get ? property_get_enum : NULL,
+                        set ? property_set_enum : NULL,
+                        property_release_enum,
+                        prop, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        g_free(prop);
+    }
+}
+
 typedef struct TMProperty {
     void (*get)(Object *, struct tm *, Error **);
 } TMProperty;
@@ -1705,7 +1892,7 @@ void object_property_add_uint64_ptr(Object *obj, const char *name,
 
 typedef struct {
     Object *target_obj;
-    const char *target_name;
+    char *target_name;
 } AliasProperty;
 
 static void property_get_alias(Object *obj, struct Visitor *v, void *opaque,
@@ -1736,6 +1923,7 @@ static void property_release_alias(Object *obj, const char *name, void *opaque)
 {
     AliasProperty *prop = opaque;
 
+    g_free(prop->target_name);
     g_free(prop);
 }
 
@@ -1763,7 +1951,7 @@ void object_property_add_alias(Object *obj, const char *name,
 
     prop = g_malloc(sizeof(*prop));
     prop->target_obj = target_obj;
-    prop->target_name = target_name;
+    prop->target_name = g_strdup(target_name);
 
     op = object_property_add(obj, name, prop_type,
                              property_get_alias,

scripts/qapi-types.py

@@ -105,7 +105,7 @@ struct %(name)s
 
 def generate_enum_lookup(name, values):
     ret = mcgen('''
-const char *%(name)s_lookup[] = {
+const char * const %(name)s_lookup[] = {
 ''',
                 name=c_name(name))
     i = 0
@@ -128,7 +128,7 @@ const char *%(name)s_lookup[] = {
 def generate_enum(name, values):
     name = c_name(name)
     lookup_decl = mcgen('''
-extern const char *%(name)s_lookup[];
+extern const char * const %(name)s_lookup[];
 ''',
                 name=name)
 

scripts/qmp/qom-tree

@@ -65,6 +65,11 @@ def list_node(path):
     print ''
     for item in items:
         if item['type'].startswith('child<'):
-            list_node(path + '/' + item['name'])
+            list_node((path if (path != '/') else '')  + '/' + item['name'])
 
-list_node('/machine')
+if len(args) == 0:
+    path = '/'
+else:
+    path = args[0]
+
+list_node(path)

tests/.gitignore

@@ -5,6 +5,7 @@ check-qjson
 check-qlist
 check-qstring
 check-qom-interface
+check-qom-proplist
 rcutorture
 test-aio
 test-bitops

tests/Makefile

@@ -68,6 +68,8 @@ check-unit-y += tests/test-bitops$(EXESUF)
 check-unit-$(CONFIG_HAS_GLIB_SUBPROCESS_TESTS) += tests/test-qdev-global-props$(EXESUF)
 check-unit-y += tests/check-qom-interface$(EXESUF)
 gcov-files-check-qom-interface-y = qom/object.c
+check-unit-y += tests/check-qom-proplist$(EXESUF)
+gcov-files-check-qom-proplist-y = qom/object.c
 check-unit-y += tests/test-qemu-opts$(EXESUF)
 gcov-files-test-qemu-opts-y = qom/test-qemu-opts.c
 check-unit-y += tests/test-write-threshold$(EXESUF)
@@ -267,7 +269,7 @@ test-qapi-obj-y = tests/test-qapi-visit.o tests/test-qapi-types.o \
 
 $(test-obj-y): QEMU_INCLUDES += -Itests
 QEMU_CFLAGS += -I$(SRC_PATH)/tests
-qom-core-obj = qom/object.o qom/qom-qobject.o qom/container.o
+qom-core-obj = qom/object.o qom/qom-qobject.o qom/container.o qom/object_interfaces.o
 
 tests/check-qint$(EXESUF): tests/check-qint.o libqemuutil.a
 tests/check-qstring$(EXESUF): tests/check-qstring.o libqemuutil.a
@@ -276,6 +278,7 @@ tests/check-qlist$(EXESUF): tests/check-qlist.o libqemuutil.a
 tests/check-qfloat$(EXESUF): tests/check-qfloat.o libqemuutil.a
 tests/check-qjson$(EXESUF): tests/check-qjson.o libqemuutil.a libqemustub.a
 tests/check-qom-interface$(EXESUF): tests/check-qom-interface.o $(qom-core-obj) libqemuutil.a libqemustub.a
+tests/check-qom-proplist$(EXESUF): tests/check-qom-proplist.o $(qom-core-obj) libqemuutil.a libqemustub.a
 tests/test-coroutine$(EXESUF): tests/test-coroutine.o $(block-obj-y) libqemuutil.a libqemustub.a
 tests/test-aio$(EXESUF): tests/test-aio.o $(block-obj-y) libqemuutil.a libqemustub.a
 tests/test-rfifolock$(EXESUF): tests/test-rfifolock.o libqemuutil.a libqemustub.a

tests/ahci-test.c

@@ -1486,7 +1486,6 @@ static void test_io_interface(gconstpointer opaque)
 static void create_ahci_io_test(enum IOMode type, enum AddrMode addr,
                                 enum BuffLen len, enum OffsetType offset)
 {
-    static const char *arch;
     char *name;
     AHCIIOTestOptions *opts = g_malloc(sizeof(AHCIIOTestOptions));
 
@@ -1495,17 +1494,13 @@ static void create_ahci_io_test(enum IOMode type, enum AddrMode addr,
     opts->io_type = type;
     opts->offset = offset;
 
-    if (!arch) {
+    name = g_strdup_printf("ahci/io/%s/%s/%s/%s",
-        arch = qtest_get_arch();
-    }
-
-    name = g_strdup_printf("/%s/ahci/io/%s/%s/%s/%s", arch,
                            io_mode_str[type],
                            addr_mode_str[addr],
                            buff_len_str[len],
                            offset_str[offset]);
 
-    g_test_add_data_func(name, opts, test_io_interface);
+    qtest_add_data_func(name, opts, test_io_interface);
     g_free(name);
 }
 

tests/check-qom-proplist.c

@@ -0,0 +1,302 @@
+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Author: Daniel P. Berrange <berrange@redhat.com>
+ */
+
+#include <glib.h>
+
+#include "qom/object.h"
+#include "qemu/module.h"
+
+
+#define TYPE_DUMMY "qemu-dummy"
+
+typedef struct DummyObject DummyObject;
+typedef struct DummyObjectClass DummyObjectClass;
+
+#define DUMMY_OBJECT(obj)                               \
+    OBJECT_CHECK(DummyObject, (obj), TYPE_DUMMY)
+
+typedef enum DummyAnimal DummyAnimal;
+
+enum DummyAnimal {
+    DUMMY_FROG,
+    DUMMY_ALLIGATOR,
+    DUMMY_PLATYPUS,
+
+    DUMMY_LAST,
+};
+
+static const char *const dummy_animal_map[DUMMY_LAST + 1] = {
+    [DUMMY_FROG] = "frog",
+    [DUMMY_ALLIGATOR] = "alligator",
+    [DUMMY_PLATYPUS] = "platypus",
+    [DUMMY_LAST] = NULL,
+};
+
+struct DummyObject {
+    Object parent_obj;
+
+    bool bv;
+    DummyAnimal av;
+    char *sv;
+};
+
+struct DummyObjectClass {
+    ObjectClass parent_class;
+};
+
+
+static void dummy_set_bv(Object *obj,
+                         bool value,
+                         Error **errp)
+{
+    DummyObject *dobj = DUMMY_OBJECT(obj);
+
+    dobj->bv = value;
+}
+
+static bool dummy_get_bv(Object *obj,
+                         Error **errp)
+{
+    DummyObject *dobj = DUMMY_OBJECT(obj);
+
+    return dobj->bv;
+}
+
+
+static void dummy_set_av(Object *obj,
+                         int value,
+                         Error **errp)
+{
+    DummyObject *dobj = DUMMY_OBJECT(obj);
+
+    dobj->av = value;
+}
+
+static int dummy_get_av(Object *obj,
+                        Error **errp)
+{
+    DummyObject *dobj = DUMMY_OBJECT(obj);
+
+    return dobj->av;
+}
+
+
+static void dummy_set_sv(Object *obj,
+                         const char *value,
+                         Error **errp)
+{
+    DummyObject *dobj = DUMMY_OBJECT(obj);
+
+    g_free(dobj->sv);
+    dobj->sv = g_strdup(value);
+}
+
+static char *dummy_get_sv(Object *obj,
+                          Error **errp)
+{
+    DummyObject *dobj = DUMMY_OBJECT(obj);
+
+    return g_strdup(dobj->sv);
+}
+
+
+static void dummy_init(Object *obj)
+{
+    object_property_add_bool(obj, "bv",
+                             dummy_get_bv,
+                             dummy_set_bv,
+                             NULL);
+    object_property_add_str(obj, "sv",
+                            dummy_get_sv,
+                            dummy_set_sv,
+                            NULL);
+    object_property_add_enum(obj, "av",
+                             "DummyAnimal",
+                             dummy_animal_map,
+                             dummy_get_av,
+                             dummy_set_av,
+                             NULL);
+}
+
+static void dummy_finalize(Object *obj)
+{
+    DummyObject *dobj = DUMMY_OBJECT(obj);
+
+    g_free(dobj->sv);
+}
+
+
+static const TypeInfo dummy_info = {
+    .name          = TYPE_DUMMY,
+    .parent        = TYPE_OBJECT,
+    .instance_size = sizeof(DummyObject),
+    .instance_init = dummy_init,
+    .instance_finalize = dummy_finalize,
+    .class_size = sizeof(DummyObjectClass),
+};
+
+static void test_dummy_createv(void)
+{
+    Error *err = NULL;
+    Object *parent = object_get_objects_root();
+    DummyObject *dobj = DUMMY_OBJECT(
+        object_new_with_props(TYPE_DUMMY,
+                              parent,
+                              "dummy0",
+                              &err,
+                              "bv", "yes",
+                              "sv", "Hiss hiss hiss",
+                              "av", "platypus",
+                              NULL));
+
+    g_assert(err == NULL);
+    g_assert_cmpstr(dobj->sv, ==, "Hiss hiss hiss");
+    g_assert(dobj->bv == true);
+    g_assert(dobj->av == DUMMY_PLATYPUS);
+
+    g_assert(object_resolve_path_component(parent, "dummy0")
+             == OBJECT(dobj));
+
+    object_unparent(OBJECT(dobj));
+}
+
+
+static Object *new_helper(Error **errp,
+                          Object *parent,
+                          ...)
+{
+    va_list vargs;
+    Object *obj;
+
+    va_start(vargs, parent);
+    obj = object_new_with_propv(TYPE_DUMMY,
+                                parent,
+                                "dummy0",
+                                errp,
+                                vargs);
+    va_end(vargs);
+    return obj;
+}
+
+static void test_dummy_createlist(void)
+{
+    Error *err = NULL;
+    Object *parent = object_get_objects_root();
+    DummyObject *dobj = DUMMY_OBJECT(
+        new_helper(&err,
+                   parent,
+                   "bv", "yes",
+                   "sv", "Hiss hiss hiss",
+                   "av", "platypus",
+                   NULL));
+
+    g_assert(err == NULL);
+    g_assert_cmpstr(dobj->sv, ==, "Hiss hiss hiss");
+    g_assert(dobj->bv == true);
+    g_assert(dobj->av == DUMMY_PLATYPUS);
+
+    g_assert(object_resolve_path_component(parent, "dummy0")
+             == OBJECT(dobj));
+
+    object_unparent(OBJECT(dobj));
+}
+
+static void test_dummy_badenum(void)
+{
+    Error *err = NULL;
+    Object *parent = object_get_objects_root();
+    Object *dobj =
+        object_new_with_props(TYPE_DUMMY,
+                              parent,
+                              "dummy0",
+                              &err,
+                              "bv", "yes",
+                              "sv", "Hiss hiss hiss",
+                              "av", "yeti",
+                              NULL);
+
+    g_assert(dobj == NULL);
+    g_assert(err != NULL);
+    g_assert_cmpstr(error_get_pretty(err), ==,
+                    "Invalid parameter 'yeti'");
+
+    g_assert(object_resolve_path_component(parent, "dummy0")
+             == NULL);
+
+    error_free(err);
+}
+
+
+static void test_dummy_getenum(void)
+{
+    Error *err = NULL;
+    int val;
+    Object *parent = object_get_objects_root();
+    DummyObject *dobj = DUMMY_OBJECT(
+        object_new_with_props(TYPE_DUMMY,
+                         parent,
+                         "dummy0",
+                         &err,
+                         "av", "platypus",
+                         NULL));
+
+    g_assert(err == NULL);
+    g_assert(dobj->av == DUMMY_PLATYPUS);
+
+    val = object_property_get_enum(OBJECT(dobj),
+                                   "av",
+                                   "DummyAnimal",
+                                   &err);
+    g_assert(err == NULL);
+    g_assert(val == DUMMY_PLATYPUS);
+
+    /* A bad enum type name */
+    val = object_property_get_enum(OBJECT(dobj),
+                                   "av",
+                                   "BadAnimal",
+                                   &err);
+    g_assert(err != NULL);
+    error_free(err);
+    err = NULL;
+
+    /* A non-enum property name */
+    val = object_property_get_enum(OBJECT(dobj),
+                                   "iv",
+                                   "DummyAnimal",
+                                   &err);
+    g_assert(err != NULL);
+    error_free(err);
+}
+
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+
+    module_call_init(MODULE_INIT_QOM);
+    type_register_static(&dummy_info);
+
+    g_test_add_func("/qom/proplist/createlist", test_dummy_createlist);
+    g_test_add_func("/qom/proplist/createv", test_dummy_createv);
+    g_test_add_func("/qom/proplist/badenum", test_dummy_badenum);
+    g_test_add_func("/qom/proplist/getenum", test_dummy_getenum);
+
+    return g_test_run();
+}

tests/e1000-test.c

@@ -44,8 +44,8 @@ int main(int argc, char **argv)
     for (i = 0; i < ARRAY_SIZE(models); i++) {
         char *path;
 
-        path = g_strdup_printf("/%s/e1000/%s", qtest_get_arch(), models[i]);
+        path = g_strdup_printf("e1000/%s", models[i]);
-        g_test_add_data_func(path, models[i], test_device);
+        qtest_add_data_func(path, models[i], test_device);
     }
 
     return g_test_run();

tests/eepro100-test.c

@@ -54,9 +54,8 @@ int main(int argc, char **argv)
     for (i = 0; i < ARRAY_SIZE(models); i++) {
         char *path;
 
-        path = g_strdup_printf("/%s/eepro100/%s",
+        path = g_strdup_printf("eepro100/%s", models[i]);
-                               qtest_get_arch(), models[i]);
+        qtest_add_data_func(path, models[i], test_device);
-        g_test_add_data_func(path, models[i], test_device);
     }
 
     return g_test_run();

tests/endianness-test.c

@@ -296,17 +296,17 @@ int main(int argc, char **argv)
         if (strcmp(test_cases[i].arch, arch) != 0) {
             continue;
         }
-        path = g_strdup_printf("/%s/endianness/%s",
+        path = g_strdup_printf("endianness/%s",
-                               arch, test_cases[i].machine);
+                               test_cases[i].machine);
-        g_test_add_data_func(path, &test_cases[i], test_endianness);
+        qtest_add_data_func(path, &test_cases[i], test_endianness);
 
-        path = g_strdup_printf("/%s/endianness/split/%s",
+        path = g_strdup_printf("endianness/split/%s",
-                               arch, test_cases[i].machine);
+                               test_cases[i].machine);
-        g_test_add_data_func(path, &test_cases[i], test_endianness_split);
+        qtest_add_data_func(path, &test_cases[i], test_endianness_split);
 
-        path = g_strdup_printf("/%s/endianness/combine/%s",
+        path = g_strdup_printf("endianness/combine/%s",
-                               arch, test_cases[i].machine);
+                               test_cases[i].machine);
-        g_test_add_data_func(path, &test_cases[i], test_endianness_combine);
+        qtest_add_data_func(path, &test_cases[i], test_endianness_combine);
     }
 
     ret = g_test_run();

tests/pc-cpu-test.c

@@ -75,7 +75,6 @@ static void test_pc_without_cpu_add(gconstpointer data)
 
 static void add_pc_test_cases(void)
 {
-    const char *arch = qtest_get_arch();
     QDict *response, *minfo;
     QList *list;
     const QListEntry *p;
@@ -119,15 +118,15 @@ static void add_pc_test_cases(void)
             (strcmp(mname, "pc-0.12") == 0) ||
             (strcmp(mname, "pc-0.11") == 0) ||
             (strcmp(mname, "pc-0.10") == 0)) {
-            path = g_strdup_printf("/%s/cpu/%s/init/%ux%ux%u&maxcpus=%u",
+            path = g_strdup_printf("cpu/%s/init/%ux%ux%u&maxcpus=%u",
-                                   arch, mname, data->sockets, data->cores,
+                                   mname, data->sockets, data->cores,
                                    data->threads, data->maxcpus);
-            g_test_add_data_func(path, data, test_pc_without_cpu_add);
+            qtest_add_data_func(path, data, test_pc_without_cpu_add);
         } else {
-            path = g_strdup_printf("/%s/cpu/%s/add/%ux%ux%u&maxcpus=%u",
+            path = g_strdup_printf("cpu/%s/add/%ux%ux%u&maxcpus=%u",
-                                   arch, mname, data->sockets, data->cores,
+                                   mname, data->sockets, data->cores,
                                    data->threads, data->maxcpus);
-            g_test_add_data_func(path, data, test_pc_with_cpu_add);
+            qtest_add_data_func(path, data, test_pc_with_cpu_add);
         }
     }
     qtest_end();

tests/qom-test.c

@@ -128,8 +128,8 @@ static void add_machine_test_cases(void)
         g_assert(qstr);
         mname = qstring_get_str(qstr);
         if (!is_blacklisted(arch, mname)) {
-            path = g_strdup_printf("/%s/qom/%s", arch, mname);
+            path = g_strdup_printf("qom/%s", mname);
-            g_test_add_data_func(path, mname, test_machine);
+            qtest_add_data_func(path, mname, test_machine);
         }
     }
     qtest_end();

vl.c

@@ -2749,6 +2749,33 @@ static int machine_set_property(void *opaque,
     return 0;
 }
 
+
+/*
+ * Initial object creation happens before all other
+ * QEMU data types are created. The majority of objects
+ * can be created at this point. The rng-egd object
+ * cannot be created here, as it depends on the chardev
+ * already existing.
+ */
+static bool object_create_initial(const char *type)
+{
+    if (g_str_equal(type, "rng-egd")) {
+        return false;
+    }
+    return true;
+}
+
+
+/*
+ * The remainder of object creation happens after the
+ * creation of chardev, fsdev and device data types.
+ */
+static bool object_create_delayed(const char *type)
+{
+    return !object_create_initial(type);
+}
+
+
 static int object_create(void *opaque, QemuOpts *opts, Error **errp)
 {
     Error *err = NULL;
@@ -2757,6 +2784,7 @@ static int object_create(void *opaque, QemuOpts *opts, Error **errp)
     void *dummy = NULL;
     OptsVisitor *ov;
     QDict *pdict;
+    bool (*type_predicate)(const char *) = opaque;
 
     ov = opts_visitor_new(opts);
     pdict = qemu_opts_to_qdict(opts, NULL);
@@ -2771,6 +2799,9 @@ static int object_create(void *opaque, QemuOpts *opts, Error **errp)
     if (err) {
         goto out;
     }
+    if (!type_predicate(type)) {
+        goto out;
+    }
 
     qdict_del(pdict, "id");
     visit_type_str(opts_get_visitor(ov), &id, "id", &err);
@@ -4192,6 +4223,12 @@ int main(int argc, char **argv, char **envp)
 
     socket_init();
 
+    if (qemu_opts_foreach(qemu_find_opts("object"),
+                          object_create,
+                          object_create_initial, NULL)) {
+        exit(1);
+    }
+
     if (qemu_opts_foreach(qemu_find_opts("chardev"),
                           chardev_init_func, NULL, NULL)) {
         exit(1);
@@ -4215,7 +4252,8 @@ int main(int argc, char **argv, char **envp)
     }
 
     if (qemu_opts_foreach(qemu_find_opts("object"),
-                          object_create, NULL, NULL)) {
+                          object_create,
+                          object_create_delayed, NULL)) {
         exit(1);
     }