rust: qdev: const_refs_to_static

Now that const_refs_static can be assumed, convert the members of
the DeviceImpl trait from functions to constants.  This lets the
compiler know that they have a 'static lifetime, and removes the
need for the weird "Box::leak()".

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250908105005.2119297-10-pbonzini@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/rust/qemu-api-macros/src/lib.rs b/rust/qemu-api-macros/src/lib.rs
index 97b2c214b6..a65a7ce2fe 100644
--- a/rust/qemu-api-macros/src/lib.rs
+++ b/rust/qemu-api-macros/src/lib.rs
@@ -289,11 +289,9 @@ fn derive_device_or_error(input: DeriveInput) -> Result<proc_macro2::TokenStream
 
     Ok(quote_spanned! {input.span() =>
         unsafe impl ::qemu_api::qdev::DevicePropertiesImpl for #name {
-            fn properties() -> &'static [::qemu_api::bindings::Property] {
-                static PROPERTIES: &[::qemu_api::bindings::Property] = &[#(#properties_expanded),*];
-
-                PROPERTIES
-            }
+            const PROPERTIES: &'static [::qemu_api::bindings::Property] = &[
+                #(#properties_expanded),*
+            ];
         }
     })
 }