rust: add qdev Device derive macro

Add derive macro for declaring qdev properties directly above the field
definitions. To do this, we split DeviceImpl::properties method on a
separate trait so we can implement only that part in the derive macro
expansion (we cannot partially implement the DeviceImpl trait).

Adding a `property` attribute above the field declaration will generate
a `qemu_api::bindings::Property` array member in the device's property
list.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/r/20250711-rust-qdev-properties-v3-1-e198624416fb@linaro.org
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 5 insertions, 19 deletions

diff --git a/rust/qemu-api/tests/tests.rs b/rust/qemu-api/tests/tests.rs
index a658a49fcf..aff3eecd65 100644
--- a/rust/qemu-api/tests/tests.rs
+++ b/rust/qemu-api/tests/tests.rs
@@ -5,11 +5,10 @@
 use std::{ffi::CStr, ptr::addr_of};
 
 use qemu_api::{
-    bindings::{module_call_init, module_init_type, qdev_prop_bool},
+    bindings::{module_call_init, module_init_type},
     cell::{self, BqlCell},
-    declare_properties, define_property,
     prelude::*,
-    qdev::{DeviceImpl, DeviceState, Property, ResettablePhasesImpl},
+    qdev::{DeviceImpl, DeviceState, ResettablePhasesImpl},
     qom::{ObjectImpl, ParentField},
     sysbus::SysBusDevice,
     vmstate::VMStateDescription,
@@ -26,9 +25,10 @@ pub static VMSTATE: VMStateDescription = VMStateDescription {
 };
 
 #[repr(C)]
-#[derive(qemu_api_macros::Object)]
+#[derive(qemu_api_macros::Object, qemu_api_macros::Device)]
 pub struct DummyState {
     parent: ParentField<DeviceState>,
+    #[property(rename = "migrate-clk", default = true)]
     migrate_clock: bool,
 }
 
@@ -44,17 +44,6 @@ impl DummyClass {
     }
 }
 
-declare_properties! {
-    DUMMY_PROPERTIES,
-        define_property!(
-            c"migrate-clk",
-            DummyState,
-            migrate_clock,
-            unsafe { &qdev_prop_bool },
-            bool
-        ),
-}
-
 unsafe impl ObjectType for DummyState {
     type Class = DummyClass;
     const TYPE_NAME: &'static CStr = c"dummy";
@@ -69,16 +58,13 @@ impl ObjectImpl for DummyState {
 impl ResettablePhasesImpl for DummyState {}
 
 impl DeviceImpl for DummyState {
-    fn properties() -> &'static [Property] {
-        &DUMMY_PROPERTIES
-    }
     fn vmsd() -> Option<&'static VMStateDescription> {
         Some(&VMSTATE)
     }
 }
 
 #[repr(C)]
-#[derive(qemu_api_macros::Object)]
+#[derive(qemu_api_macros::Object, qemu_api_macros::Device)]
 pub struct DummyChildState {
     parent: ParentField<DummyState>,
 }