qom: Implement qom-set HMP command

Re-implemented based on qmp_qom_set() to facilitate argument parsing.

Warn about ambiguous path arguments.
Reviewed-by: NGonglei <arei.gonglei@huawei.com>
Tested-by: NAlistair Francis <alistair.francis@xilinx.com>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

hmp-commands.hx

@@ -1684,6 +1684,19 @@ ETEXI
 STEXI
 @item qom-list [@var{path}]
 Print QOM properties of object at location @var{path}
+ETEXI
+
+    {
+        .name       = "qom-set",
+        .args_type  = "path:s,property:s,value:s",
+        .params     = "path property value",
+        .help       = "set QOM property",
+        .mhandler.cmd  = hmp_qom_set,
+    },
+
+STEXI
+@item qom-set @var{path} @var{property} @var{value}
+Set QOM property @var{property} of object at location @var{path} to value @var{value}
 ETEXI
 
     {

hmp.c

@@ -1892,3 +1892,24 @@ void hmp_qom_list(Monitor *mon, const QDict *qdict)
     }
     hmp_handle_error(mon, &err);
 }
+
+void hmp_qom_set(Monitor *mon, const QDict *qdict)
+{
+    const char *path = qdict_get_str(qdict, "path");
+    const char *property = qdict_get_str(qdict, "property");
+    const char *value = qdict_get_str(qdict, "value");
+    Error *err = NULL;
+    bool ambiguous = false;
+    Object *obj;
+
+    obj = object_resolve_path(path, &ambiguous);
+    if (obj == NULL) {
+        error_set(&err, QERR_DEVICE_NOT_FOUND, path);
+    } else {
+        if (ambiguous) {
+            monitor_printf(mon, "Warning: Path '%s' is ambiguous\n", path);
+        }
+        object_property_parse(obj, value, property, &err);
+    }
+    hmp_handle_error(mon, &err);
+}

hmp.h

@@ -97,6 +97,7 @@ void hmp_object_del(Monitor *mon, const QDict *qdict);
 void hmp_info_memdev(Monitor *mon, const QDict *qdict);
 void hmp_info_memory_devices(Monitor *mon, const QDict *qdict);
 void hmp_qom_list(Monitor *mon, const QDict *qdict);
+void hmp_qom_set(Monitor *mon, const QDict *qdict);
 void object_add_completion(ReadLineState *rs, int nb_args, const char *str);
 void object_del_completion(ReadLineState *rs, int nb_args, const char *str);
 void device_add_completion(ReadLineState *rs, int nb_args, const char *str);