commit a8dc82ce828579b92cf602cdc307a6c5b144069c
author Greg Kurz <groug@kaod.org> Fri Aug 14 09:24:50 2020 +0200
committer David Gibson <david@gibson.dropbear.id.au> Mon Feb 08 16:57:37 2021 +1100
tree cddc03e80de4a48c17c9b87419e55628265fcd6f
parent 5b19cb63d9dfda41b412373b8c9fe14641bcab60

qom: Allow optional sugar props

Global properties have an @optional field, which allows to apply a given
property to a given type even if one of its subclasses doesn't support
it. This is especially used in the compat code when dealing with the
"disable-modern" and "disable-legacy" properties and the "virtio-pci"
type.

Allow object_register_sugar_prop() to set this field as well.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <159738953558.377274.16617742952571083440.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

qom/object.c

diff --git a/qom/object.c b/qom/object.c
index 2fa0119..491823d 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -442,7 +442,8 @@
  * other than "-global".  These are generally used for syntactic
  * sugar and legacy command line options.
  */
-void object_register_sugar_prop(const char *driver, const char *prop, const char *value)
+void object_register_sugar_prop(const char *driver, const char *prop,
+                                const char *value, bool optional)
 {
     GlobalProperty *g;
     if (!object_compat_props[2]) {
@@ -452,6 +453,7 @@
     g->driver = g_strdup(driver);
     g->property = g_strdup(prop);
     g->value = g_strdup(value);
+    g->optional = optional;
     g_ptr_array_add(object_compat_props[2], g);
 }