[PATCH v2 2/7] hw/nvram/fw_cfg: Pass QOM parent to fw_cfg_add_file_from_generator()

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Currently fw_cfg_add_file_from_generator() is restricted
to command line created objects which reside in the
'/objects' QOM container. In order to extend to other
types of containers, pass the QOM parent by argument.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
---
 include/hw/nvram/fw_cfg.h | 10 ++++++----
 hw/nvram/fw_cfg.c         | 11 ++++++-----
 system/vl.c               |  3 ++-
 3 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h
index 14e68966c59..fcb06f18cc3 100644
--- a/include/hw/nvram/fw_cfg.h
+++ b/include/hw/nvram/fw_cfg.h
@@ -294,11 +294,12 @@ void *fw_cfg_modify_file(FWCfgState *s, const char *filename, void *data,
  * fw_cfg_add_file_from_generator:
  * @s: fw_cfg device being modified
  * @filename: name of new fw_cfg file item
- * @gen_id: name of object implementing FW_CFG_DATA_GENERATOR interface
+ * @part: name of object implementing FW_CFG_DATA_GENERATOR interface
+ * @parent: the object in which to resolve the @part
  * @errp: pointer to a NULL initialized error object
  *
  * Add a new NAMED fw_cfg item with the content generated from the
- * @gen_id object. The data generated by the @gen_id object is copied
+ * @part object. The data generated by the @part object is copied
  * into the data structure of the fw_cfg device.
  * The next available (unused) selector key starting at FW_CFG_FILE_FIRST
  * will be used; also, a new entry will be added to the file directory
@@ -307,8 +308,9 @@ void *fw_cfg_modify_file(FWCfgState *s, const char *filename, void *data,
  *
  * Returns: %true on success, %false on error.
  */
-bool fw_cfg_add_file_from_generator(FWCfgState *s, const char *filename,
-                                    const char *gen_id, Error **errp);
+bool fw_cfg_add_file_from_generator(FWCfgState *s,
+                                    Object *parent, const char *part,
+                                    const char *filename, Error **errp);
 
 /**
  * fw_cfg_add_extra_pci_roots:
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index fe3b86135a7..b94cd27bd85 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -1027,22 +1027,23 @@ void *fw_cfg_modify_file(FWCfgState *s, const char *filename,
     return NULL;
 }
 
-bool fw_cfg_add_file_from_generator(FWCfgState *s, const char *filename,
-                                    const char *gen_id, Error **errp)
+bool fw_cfg_add_file_from_generator(FWCfgState *s,
+                                    Object *parent, const char *part,
+                                    const char *filename, Error **errp)
 {
     FWCfgDataGeneratorClass *klass;
     GByteArray *array;
     Object *obj;
     gsize size;
 
-    obj = object_resolve_path_component(object_get_objects_root(), gen_id);
+    obj = object_resolve_path_component(parent, part);
     if (!obj) {
-        error_setg(errp, "Cannot find object ID '%s'", gen_id);
+        error_setg(errp, "Cannot find object ID '%s'", part);
         return false;
     }
     if (!object_dynamic_cast(obj, TYPE_FW_CFG_DATA_GENERATOR_INTERFACE)) {
         error_setg(errp, "Object ID '%s' is not a '%s' subclass",
-                   gen_id, TYPE_FW_CFG_DATA_GENERATOR_INTERFACE);
+                   part, TYPE_FW_CFG_DATA_GENERATOR_INTERFACE);
         return false;
     }
     klass = FW_CFG_DATA_GENERATOR_GET_CLASS(obj);
diff --git a/system/vl.c b/system/vl.c
index f103532a9a1..4a370da624a 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -1184,7 +1184,8 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
         size = strlen(str); /* NUL terminator NOT included in fw_cfg blob */
         buf = g_memdup(str, size);
     } else if (nonempty_str(gen_id)) {
-        if (!fw_cfg_add_file_from_generator(fw_cfg, name, gen_id, errp)) {
+        if (!fw_cfg_add_file_from_generator(fw_cfg, object_get_objects_root(),
+                                            gen_id, name, errp)) {
             return -1;
         }
         return 0;
-- 
2.45.2