rust: add definitions for vmstate

Add a new qemu_api module, `vmstate`. Declare a bunch of Rust
macros declared that are equivalent in spirit to the C macros in
include/migration/vmstate.h.

For example the Rust of equivalent of the C macro:

  VMSTATE_UINT32(field_name, struct_name)

is:

  vmstate_uint32!(field_name, StructName)

This breathtaking development will allow us to reach feature parity between
the Rust and C pl011 implementations.

Extracted from a patch by Manos Pitsidianakis
(https://lore.kernel.org/qemu-devel/20241024-rust-round-2-v1-4-051e7a25b978@linaro.org/).

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/rust/qemu-api/tests/tests.rs b/rust/qemu-api/tests/tests.rs
index aa1e056..37c4dd4 100644
--- a/rust/qemu-api/tests/tests.rs
+++ b/rust/qemu-api/tests/tests.rs
@@ -8,17 +8,18 @@ use qemu_api::{
     bindings::*,
     declare_properties, define_property,
     definitions::{Class, ObjectImpl},
-    device_class_init, vm_state_description,
+    device_class_init,
+    zeroable::Zeroable,
 };
 
 #[test]
 fn test_device_decl_macros() {
     // Test that macros can compile.
-    vm_state_description! {
-        VMSTATE,
-        name: c"name",
+    pub static VMSTATE: VMStateDescription = VMStateDescription {
+        name: c"name".as_ptr(),
         unmigratable: true,
-    }
+        ..Zeroable::ZERO
+    };
 
     #[repr(C)]
     #[derive(qemu_api_macros::Object)]