rust: use std::ffi instead of std::os::raw

This is allowed since Rust 1.64.0.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

docs/devel/rust.rst

@@ -74,8 +74,6 @@ Supported tools
 QEMU supports rustc version 1.63.0 and newer.  Notably, the following features
 are missing:
 
-* ``core::ffi`` (1.64.0).  Use ``std::os::raw`` and ``std::ffi`` instead.
-
 * ``cast_mut()``/``cast_const()`` (1.65.0).  Use ``as`` instead.
 
 * "let ... else" (1.65.0).  Use ``if let`` instead.  This is currently patched

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

@@ -3,7 +3,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 use std::{
-    os::raw::{c_int, c_void},
+    ffi::{c_int, c_void},
     ptr::NonNull,
 };
 

rust/hw/timer/hpet/src/hpet.rs

@@ -3,8 +3,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 use std::{
-    ffi::CStr,
-    os::raw::{c_int, c_void},
+    ffi::{c_int, c_void, CStr},
     pin::Pin,
     ptr::{addr_of_mut, null_mut, NonNull},
     slice::from_ref,

rust/qemu-api/src/chardev.rs

@@ -10,11 +10,10 @@
 //! called.
 
 use std::{
-    ffi::CStr,
+    ffi::{c_int, c_void, CStr},
     fmt::{self, Debug},
     io::{self, ErrorKind, Write},
     marker::PhantomPinned,
-    os::raw::{c_int, c_void},
     ptr::addr_of_mut,
     slice,
 };

rust/qemu-api/src/irq.rs

@@ -4,7 +4,11 @@
 
 //! Bindings for interrupt sources
 
-use std::{ffi::CStr, marker::PhantomData, os::raw::c_int, ptr};
+use std::{
+    ffi::{c_int, CStr},
+    marker::PhantomData,
+    ptr,
+};
 
 use crate::{
     bindings::{self, qemu_set_irq},

rust/qemu-api/src/lib.rs

@@ -33,7 +33,7 @@ pub mod zeroable;
 
 use std::{
     alloc::{GlobalAlloc, Layout},
-    os::raw::c_void,
+    ffi::c_void,
 };
 
 #[cfg(HAVE_GLIB_WITH_ALIGNED_ALLOC)]

rust/qemu-api/src/memory.rs

@@ -5,9 +5,8 @@
 //! Bindings for `MemoryRegion`, `MemoryRegionOps` and `MemTxAttrs`
 
 use std::{
-    ffi::{CStr, CString},
+    ffi::{c_uint, c_void, CStr, CString},
     marker::PhantomData,
-    os::raw::{c_uint, c_void},
 };
 
 pub use bindings::{hwaddr, MemTxAttrs};

rust/qemu-api/src/qdev.rs

@@ -5,8 +5,7 @@
 //! Bindings to create devices and access device functionality from Rust.
 
 use std::{
-    ffi::{CStr, CString},
-    os::raw::{c_int, c_void},
+    ffi::{c_int, c_void, CStr, CString},
     ptr::NonNull,
 };
 

rust/qemu-api/src/qom.rs

@@ -93,11 +93,10 @@
 //! without incurring into violations of orphan rules for traits.
 
 use std::{
-    ffi::CStr,
+    ffi::{c_void, CStr},
     fmt,
     mem::ManuallyDrop,
     ops::{Deref, DerefMut},
-    os::raw::c_void,
     ptr::NonNull,
 };
 

rust/qemu-api/src/timer.rs

@@ -3,7 +3,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 use std::{
-    os::raw::{c_int, c_void},
+    ffi::{c_int, c_void},
     pin::Pin,
 };
 

rust/qemu-api/src/vmstate.rs

@@ -25,7 +25,7 @@
 //!   functionality that is missing from `vmstate_of!`.
 
 use core::{marker::PhantomData, mem, ptr::NonNull};
-use std::os::raw::{c_int, c_void};
+use std::ffi::{c_int, c_void};
 
 pub use crate::bindings::{VMStateDescription, VMStateField};
 use crate::{

rust/qemu-api/tests/vmstate_tests.rs

@@ -2,7 +2,12 @@
 // Author(s): Zhao Liu <zhai1.liu@intel.com>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-use std::{ffi::CStr, mem::size_of, os::raw::c_void, ptr::NonNull, slice};
+use std::{
+    ffi::{c_void, CStr},
+    mem::size_of,
+    ptr::NonNull,
+    slice,
+};
 
 use qemu_api::{
     bindings::{