hw/core: Introduce device_class_set_props_n

Record the size of the array in DeviceClass.props_count_.
Iterate with known count in qdev_prop_walk.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Lei Yang <leiyang@redhat.com>
Link: https://lore.kernel.org/r/20241218134251.4724-14-richard.henderson@linaro.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index cbce3cf0b4..e9b4891f55 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -139,6 +139,12 @@ struct DeviceClass {
     const Property *props_;
 
     /**
+     * @props_count_: number of elements in @props_; should only be
+     * assigned by using device_class_set_props().
+     */
+    uint16_t props_count_;
+
+    /**
      * @user_creatable: Can user instantiate with -device / device_add?
      *
      * All devices should support instantiation with device_add, and
@@ -961,6 +967,18 @@ void device_class_set_props(DeviceClass *dc, const Property *props);
     } while (0)
 
 /**
+ * device_class_set_props_n(): add a set of properties to an device
+ * @dc: the parent DeviceClass all devices inherit
+ * @props: an array of properties, not terminated by DEFINE_PROP_END_OF_LIST.
+ * @n: ARRAY_SIZE(@props)
+ *
+ * This will add a set of properties to the object. It will fault if
+ * you attempt to add an existing property defined by a parent class.
+ * To modify an inherited property you need to use????
+ */
+void device_class_set_props_n(DeviceClass *dc, const Property *props, size_t n);
+
+/**
  * device_class_set_parent_realize() - set up for chaining realize fns
  * @dc: The device class
  * @dev_realize: the device realize function