[PATCH 4/4] qom: drop the 'is_available' callback from TypeInfo

["Daniel P. Berrangé" <berrange@redhat.com>]

For the purposes of introspection, a binary must always register
all compiled in types (classes). Any filtering of what is
permitted with a given selected target should happen at time of
use/query. As such the 'is_available' callback on TypeInfo is
an undesirable design pattern and with Machine classes converted
it can be removed.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 include/qom/object.h | 3 ---
 qom/object.c         | 4 ----
 rust/qom/src/qom.rs  | 1 -
 3 files changed, 8 deletions(-)

diff --git a/include/qom/object.h b/include/qom/object.h
index 70d8ea3e299..06a55b410ba 100644
--- a/include/qom/object.h
+++ b/include/qom/object.h
@@ -475,8 +475,6 @@ struct Object
  * @class_data: Data to pass to the @class_init,
  *   @class_base_init. This can be useful when building dynamic
  *   classes.
- * @is_available: callback invoked at registration time, to dynamically check if
- *   this type should be available or not.
  * @interfaces: The list of interfaces associated with this type.  This
  *   should point to a static array that's terminated with a zero filled
  *   element.
@@ -500,7 +498,6 @@ struct TypeInfo
     void (*class_base_init)(ObjectClass *klass, const void *data);
     const void *class_data;
 
-    bool (*is_available)(void);
     const InterfaceInfo *interfaces;
 };
 
diff --git a/qom/object.c b/qom/object.c
index cd0590c3fd0..1d9ff06cacf 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -167,10 +167,6 @@ static TypeImpl *type_register_internal(const TypeInfo *info)
         abort();
     }
 
-    if (info->is_available && !info->is_available()) {
-        return NULL;
-    }
-
     ti = type_new(info);
 
     type_table_add(ti);
diff --git a/rust/qom/src/qom.rs b/rust/qom/src/qom.rs
index 81449eeefad..372be188622 100644
--- a/rust/qom/src/qom.rs
+++ b/rust/qom/src/qom.rs
@@ -695,7 +695,6 @@ pub trait ObjectImpl: ObjectType + IsA<Object> {
         class_init: Some(rust_class_init::<Self>),
         class_base_init: Self::CLASS_BASE_INIT,
         class_data: core::ptr::null(),
-        is_available: None,
         interfaces: core::ptr::null(),
     };
 
-- 
2.56.0