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, 26 deletions

diff --git a/rust/hw/char/pl011/src/device.rs b/rust/hw/char/pl011/src/device.rs
index ceb71dd99b..3794463520 100644
--- a/rust/hw/char/pl011/src/device.rs
+++ b/rust/hw/char/pl011/src/device.rs
@@ -9,7 +9,6 @@ use std::{
 };
 
 use qemu_api::{
-    bindings::{qdev_prop_bool, qdev_prop_chr},
     chardev::{CharBackend, Chardev, Event},
     impl_vmstate_forward,
     irq::{IRQState, InterruptSource},
@@ -17,7 +16,7 @@ use qemu_api::{
     log_mask_ln,
     memory::{hwaddr, MemoryRegion, MemoryRegionOps, MemoryRegionOpsBuilder},
     prelude::*,
-    qdev::{Clock, ClockEvent, DeviceImpl, DeviceState, Property, ResetType, ResettablePhasesImpl},
+    qdev::{Clock, ClockEvent, DeviceImpl, DeviceState, ResetType, ResettablePhasesImpl},
     qom::{ObjectImpl, Owned, ParentField, ParentInit},
     static_assert,
     sysbus::{SysBusDevice, SysBusDeviceImpl},
@@ -105,12 +104,13 @@ pub struct PL011Registers {
 }
 
 #[repr(C)]
-#[derive(qemu_api_macros::Object)]
+#[derive(qemu_api_macros::Object, qemu_api_macros::Device)]
 /// PL011 Device Model in QEMU
 pub struct PL011State {
     pub parent_obj: ParentField<SysBusDevice>,
     pub iomem: MemoryRegion,
     #[doc(alias = "chr")]
+    #[property(rename = "chardev")]
     pub char_backend: CharBackend,
     pub regs: BqlRefCell<PL011Registers>,
     /// QEMU interrupts
@@ -129,6 +129,7 @@ pub struct PL011State {
     #[doc(alias = "clk")]
     pub clock: Owned<Clock>,
     #[doc(alias = "migrate_clk")]
+    #[property(rename = "migrate-clk", default = true)]
     pub migrate_clock: bool,
 }
 
@@ -176,9 +177,6 @@ impl ObjectImpl for PL011State {
 }
 
 impl DeviceImpl for PL011State {
-    fn properties() -> &'static [Property] {
-        &PL011_PROPERTIES
-    }
     fn vmsd() -> Option<&'static VMStateDescription> {
         Some(&VMSTATE_PL011)
     }
@@ -690,7 +688,7 @@ pub unsafe extern "C" fn pl011_create(
 }
 
 #[repr(C)]
-#[derive(qemu_api_macros::Object)]
+#[derive(qemu_api_macros::Object, qemu_api_macros::Device)]
 /// PL011 Luminary device model.
 pub struct PL011Luminary {
     parent_obj: ParentField<PL011State>,
@@ -782,22 +780,3 @@ pub static VMSTATE_PL011: VMStateDescription = VMStateDescription {
     },
     ..Zeroable::ZERO
 };
-
-qemu_api::declare_properties! {
-    PL011_PROPERTIES,
-    qemu_api::define_property!(
-        c"chardev",
-        PL011State,
-        char_backend,
-        unsafe { &qdev_prop_chr },
-        CharBackend
-    ),
-    qemu_api::define_property!(
-        c"migrate-clk",
-        PL011State,
-        migrate_clock,
-        unsafe { &qdev_prop_bool },
-        bool,
-        default = true
-    ),
-}