[Qemu-devel] [PATCH v3 03/20] qom: register legacy properties as new style properties (v2)

[Anthony Liguori <aliguori@us.ibm.com>]

Expose all legacy properties through the new QOM property mechanism.  The qdev
property types are exposed through the 'legacy<>' namespace.  They are always
visited as strings since they do their own string parsing.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
v1 -> v2
 - add bus properties (Gerd)
---
 hw/qdev.c |   86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/qdev.h |    7 +++++
 2 files changed, 93 insertions(+), 0 deletions(-)

diff --git a/hw/qdev.c b/hw/qdev.c
index 94f14c1..6f77af9 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -83,6 +83,7 @@ static DeviceInfo *qdev_find_info(BusInfo *bus_info, const char *name)
 static DeviceState *qdev_create_from_info(BusState *bus, DeviceInfo *info)
 {
     DeviceState *dev;
+    Property *prop;
 
     assert(bus->info == info->bus_info);
     dev = g_malloc0(info->size);
@@ -100,6 +101,15 @@ static DeviceState *qdev_create_from_info(BusState *bus, DeviceInfo *info)
     dev->instance_id_alias = -1;
     QTAILQ_INIT(&dev->properties);
     dev->state = DEV_STATE_CREATED;
+
+    for (prop = dev->info->props; prop && prop->name; prop++) {
+        qdev_property_add_legacy(dev, prop, NULL);
+    }
+
+    for (prop = dev->info->bus_info->props; prop && prop->name; prop++) {
+        qdev_property_add_legacy(dev, prop, NULL);
+    }
+
     return dev;
 }
 
@@ -1075,3 +1085,79 @@ const char *qdev_property_get_type(DeviceState *dev, const char *name, Error **e
 
     return prop->type;
 }
+
+/**
+ * Legacy property handling
+ */
+
+static void qdev_get_legacy_property(DeviceState *dev, Visitor *v, void *opaque,
+                                     const char *name, Error **errp)
+{
+    Property *prop = opaque;
+
+    if (prop->info->print) {
+        char buffer[1024];
+        char *ptr = buffer;
+
+        prop->info->print(dev, prop, buffer, sizeof(buffer));
+        visit_type_str(v, &ptr, name, errp);
+    } else {
+        error_set(errp, QERR_PERMISSION_DENIED);
+    }
+}
+
+static void qdev_set_legacy_property(DeviceState *dev, Visitor *v, void *opaque,
+                                     const char *name, Error **errp)
+{
+    Property *prop = opaque;
+
+    if (dev->state != DEV_STATE_CREATED) {
+        error_set(errp, QERR_PERMISSION_DENIED);
+        return;
+    }
+
+    if (prop->info->parse) {
+        Error *local_err = NULL;
+        char *ptr = NULL;
+
+        visit_type_str(v, &ptr, name, &local_err);
+        if (!local_err) {
+            int ret;
+            ret = prop->info->parse(dev, prop, ptr);
+            if (ret != 0) {
+                error_set(errp, QERR_INVALID_PARAMETER_VALUE,
+                          name, prop->info->name);
+            }
+            g_free(ptr);
+        } else {
+            error_propagate(errp, local_err);
+        }
+    } else {
+        error_set(errp, QERR_PERMISSION_DENIED);
+    }
+}
+
+/**
+ * @qdev_add_legacy_property - adds a legacy property
+ *
+ * Do not use this is new code!  Properties added through this interface will
+ * be given types in the "legacy<>" type namespace.
+ *
+ * Legacy properties are always processed as strings.  The format of the string
+ * depends on the property type.
+ */
+void qdev_property_add_legacy(DeviceState *dev, Property *prop,
+                              Error **errp)
+{
+    gchar *type;
+
+    type = g_strdup_printf("legacy<%s>", prop->info->name);
+
+    qdev_property_add(dev, prop->name, type,
+                      qdev_get_legacy_property,
+                      qdev_set_legacy_property,
+                      NULL,
+                      prop, errp);
+
+    g_free(type);
+}
diff --git a/hw/qdev.h b/hw/qdev.h
index 2df3bb7..3b629d4 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -475,4 +475,11 @@ void qdev_property_set(DeviceState *dev, Visitor *v, const char *name,
 const char *qdev_property_get_type(DeviceState *dev, const char *name,
                                    Error **errp);
 
+/**
+ * @qdev_property_add_legacy - add a legacy @Property to a device
+ *
+ * DO NOT USE THIS IN NEW CODE!
+ */
+void qdev_property_add_legacy(DeviceState *dev, Property *prop, Error **errp);
+
 #endif
-- 
1.7.4.1