[PATCH v3 04/15] rust/vmstate: Fix size field of VMStateField with VMS_ARRAY_OF_POINTER flag

[Zhao Liu <zhao1.liu@intel.com>]

The `size` field of the VMStateField with VMS_ARRAY_OF_POINTER flag
should stores the size of pointer, which depends on platform.

Currently, `*const`, `*mut`, `NonNull`, `Box<>` and their wrapper are
supported, and they have the same size as `usize`.

Store the size (of `usize`) when VMS_ARRAY_OF_POINTER flag is set.

The size may be changed when more smart pointers are supported, but now
the size of "usize" is enough.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 rust/qemu-api/src/vmstate.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rust/qemu-api/src/vmstate.rs b/rust/qemu-api/src/vmstate.rs
index e3233303f204..e2a1f7a97aae 100644
--- a/rust/qemu-api/src/vmstate.rs
+++ b/rust/qemu-api/src/vmstate.rs
@@ -256,6 +256,10 @@ pub const fn with_array_flag(mut self, num: usize) -> Self {
         if (self.flags.0 & VMStateFlags::VMS_POINTER.0) != 0 {
             self.flags = VMStateFlags(self.flags.0 & !VMStateFlags::VMS_POINTER.0);
             self.flags = VMStateFlags(self.flags.0 | VMStateFlags::VMS_ARRAY_OF_POINTER.0);
+            // VMS_ARRAY_OF_POINTER flag stores the size of pointer.
+            // FIXME: *const, *mut, NonNull and Box<> have the same size as usize.
+            //        Resize if more smart pointers are supported.
+            self.size = std::mem::size_of::<usize>();
         }
         self.flags = VMStateFlags(self.flags.0 & !VMStateFlags::VMS_SINGLE.0);
         self.flags = VMStateFlags(self.flags.0 | VMStateFlags::VMS_ARRAY.0);
-- 
2.34.1