[PATCH 15/33] rust: move Cell vmstate impl

[Paolo Bonzini <pbonzini@redhat.com>]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

This will allow to split vmstate to a standalone crate next.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Link: https://lore.kernel.org/r/20250827104147.717203-10-marcandre.lureau@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 rust/qemu-api/src/cell.rs    |  6 +++++-
 rust/qemu-api/src/vmstate.rs | 14 +++++++-------
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/rust/qemu-api/src/cell.rs b/rust/qemu-api/src/cell.rs
index 148a13e3f56..9943d7286b6 100644
--- a/rust/qemu-api/src/cell.rs
+++ b/rust/qemu-api/src/cell.rs
@@ -221,7 +221,7 @@
     ptr::NonNull,
 };
 
-use crate::bindings;
+use crate::{bindings, impl_vmstate_transparent};
 
 /// An internal function that is used by doctests.
 pub fn bql_start_test() {
@@ -456,6 +456,8 @@ pub fn take(&self) -> T {
     }
 }
 
+impl_vmstate_transparent!(crate::cell::BqlCell<T> where T: VMState);
+
 /// A mutable memory location with dynamically checked borrow rules,
 /// protected by the Big QEMU Lock.
 ///
@@ -764,6 +766,8 @@ fn from(t: T) -> BqlRefCell<T> {
     }
 }
 
+impl_vmstate_transparent!(crate::cell::BqlRefCell<T> where T: VMState);
+
 struct BorrowRef<'b> {
     borrow: &'b Cell<BorrowFlag>,
 }
diff --git a/rust/qemu-api/src/vmstate.rs b/rust/qemu-api/src/vmstate.rs
index 4e1086779ac..ce42b031bc1 100644
--- a/rust/qemu-api/src/vmstate.rs
+++ b/rust/qemu-api/src/vmstate.rs
@@ -124,7 +124,8 @@ pub const fn vmstate_varray_flag<T: VMState>(_: PhantomData<T>) -> VMStateFlags
 /// * scalar types (integer and `bool`)
 /// * the C struct `QEMUTimer`
 /// * a transparent wrapper for any of the above (`Cell`, `UnsafeCell`,
-///   [`BqlCell`], [`BqlRefCell`]
+///   [`BqlCell`](crate::cell::BqlCell),
+///   [`BqlRefCell`](crate::cell::BqlRefCell)),
 /// * a raw pointer to any of the above
 /// * a `NonNull` pointer, a `Box` or an [`Owned`](crate::qom::Owned) for any of
 ///   the above
@@ -254,14 +255,15 @@ unsafe impl $crate::vmstate::VMState for $tuple {
 
 // Transparent wrappers: just use the internal type
 
+#[macro_export]
 macro_rules! impl_vmstate_transparent {
     ($type:ty where $base:tt: VMState $($where:tt)*) => {
-        unsafe impl<$base> VMState for $type where $base: VMState $($where)* {
-            const BASE: VMStateField = VMStateField {
+        unsafe impl<$base> $crate::vmstate::VMState for $type where $base: $crate::vmstate::VMState $($where)* {
+            const BASE: $crate::vmstate::VMStateField = $crate::vmstate::VMStateField {
                 size: mem::size_of::<$type>(),
-                ..<$base as VMState>::BASE
+                ..<$base as $crate::vmstate::VMState>::BASE
             };
-            const VARRAY_FLAG: VMStateFlags = <$base as VMState>::VARRAY_FLAG;
+            const VARRAY_FLAG: $crate::bindings::VMStateFlags = <$base as $crate::vmstate::VMState>::VARRAY_FLAG;
         }
     };
 }
@@ -269,8 +271,6 @@ unsafe impl<$base> VMState for $type where $base: VMState $($where)* {
 impl_vmstate_transparent!(std::cell::Cell<T> where T: VMState);
 impl_vmstate_transparent!(std::cell::UnsafeCell<T> where T: VMState);
 impl_vmstate_transparent!(std::pin::Pin<T> where T: VMState);
-impl_vmstate_transparent!(crate::cell::BqlCell<T> where T: VMState);
-impl_vmstate_transparent!(crate::cell::BqlRefCell<T> where T: VMState);
 impl_vmstate_transparent!(crate::cell::Opaque<T> where T: VMState);
 
 #[macro_export]
-- 
2.51.0