qdev-properties: PropertyInfo: add realized_set_allowed field

Add field, so property can declare support for setting the property
when device is realized. To be used in the following commit.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20210824083856.17408-4-vsementsov@virtuozzo.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>

hw/core/qdev-properties.c

@@ -26,11 +26,11 @@ void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
 
 /* returns: true if property is allowed to be set, false otherwise */
 static bool qdev_prop_allow_set(Object *obj, const char *name,
-                                Error **errp)
+                                const PropertyInfo *info, Error **errp)
 {
     DeviceState *dev = DEVICE(obj);
 
-    if (dev->realized) {
+    if (dev->realized && !info->realized_set_allowed) {
         qdev_prop_set_after_realize(dev, name, errp);
         return false;
     }
@@ -79,7 +79,7 @@ static void field_prop_set(Object *obj, Visitor *v, const char *name,
 {
     Property *prop = opaque;
 
-    if (!qdev_prop_allow_set(obj, name, errp)) {
+    if (!qdev_prop_allow_set(obj, name, prop->info, errp)) {
         return;
     }
 

include/hw/qdev-properties.h

@@ -32,6 +32,7 @@ struct PropertyInfo {
     const char *name;
     const char *description;
     const QEnumLookup *enum_table;
+    bool realized_set_allowed; /* allow setting property on realized device */
     int (*print)(Object *obj, Property *prop, char *dest, size_t len);
     void (*set_default_value)(ObjectProperty *op, const Property *prop);
     ObjectProperty *(*create)(ObjectClass *oc, const char *name,