rust: chardev, qdev: add bindings to qdev_prop_set_chr

Because the argument to the function is an Owned<Chardev>, this also
adds an ObjectType implementation to Chardev.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

rust/hw/char/pl011/src/device.rs

@@ -12,9 +12,10 @@ use qemu_api::{
     bindings::{
         error_fatal, qdev_prop_set_chr, qemu_chr_fe_accept_input, qemu_chr_fe_ioctl,
         qemu_chr_fe_set_handlers, qemu_chr_fe_write_all, qemu_irq, sysbus_connect_irq,
-        sysbus_mmio_map, sysbus_realize, CharBackend, Chardev, QEMUChrEvent,
+        sysbus_mmio_map, sysbus_realize, CharBackend, QEMUChrEvent,
         CHR_IOCTL_SERIAL_SET_BREAK,
     },
+    chardev::Chardev,
     c_str, impl_vmstate_forward,
     irq::InterruptSource,
     memory::{hwaddr, MemoryRegion, MemoryRegionOps, MemoryRegionOpsBuilder},

rust/qemu-api/meson.build

@@ -20,6 +20,7 @@ _qemu_api_rs = static_library(
       'src/bitops.rs',
       'src/callbacks.rs',
       'src/cell.rs',
+      'src/chardev.rs',
       'src/c_str.rs',
       'src/irq.rs',
       'src/memory.rs',

rust/qemu-api/src/chardev.rs

@@ -0,0 +1,19 @@
+// Copyright 2024 Red Hat, Inc.
+// Author(s): Paolo Bonzini <pbonzini@redhat.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+//! Bindings for character devices
+
+use std::ffi::CStr;
+
+use crate::{bindings, prelude::*};
+
+pub type Chardev = bindings::Chardev;
+pub type ChardevClass = bindings::ChardevClass;
+
+unsafe impl ObjectType for Chardev {
+    type Class = ChardevClass;
+    const TYPE_NAME: &'static CStr =
+        unsafe { CStr::from_bytes_with_nul_unchecked(bindings::TYPE_CHARDEV) };
+}
+qom_isa!(Chardev: Object);

rust/qemu-api/src/lib.rs

@@ -18,6 +18,7 @@ pub mod bitops;
 pub mod c_str;
 pub mod callbacks;
 pub mod cell;
+pub mod chardev;
 pub mod irq;
 pub mod memory;
 pub mod module;

rust/qemu-api/src/qdev.rs

@@ -16,6 +16,7 @@ use crate::{
     bindings::{self, Error, ResettableClass},
     callbacks::FnCall,
     cell::bql_locked,
+    chardev::Chardev,
     prelude::*,
     qom::{ClassInitImpl, ObjectClass, ObjectImpl, Owned},
     vmstate::VMStateDescription,
@@ -297,6 +298,14 @@ where
             Owned::from(&*clk)
         }
     }
+
+    fn prop_set_chr(&self, propname: &str, chr: &Owned<Chardev>) {
+        assert!(bql_locked());
+        let c_propname = CString::new(propname).unwrap();
+        unsafe {
+            bindings::qdev_prop_set_chr(self.as_mut_ptr(), c_propname.as_ptr(), chr.as_mut_ptr());
+        }
+    }
 }
 
 impl<R: ObjectDeref> DeviceMethods for R where R::Target: IsA<DeviceState> {}