LockedBox use examples

Could you please give some examples how to use LockedBox?
I have a code like this:

#[repr(C, packed)]
#[derive(Debug, Clone, Copy, DeviceCopy)]
pub struct SomeResult {
    pub field: u32
}
...
let mut some_result = SomeResult::default();
let mut lb_some_result = LockedBox::new(&some_result).unwrap();

What should I do to copy it to DeviceBox and back from DeviceBox after the kernel finishes? Things like
let dev_results = DeviceBox::new(&lb_some_result).unwrap();
are not working.

The issue names LockedBox, DeviceBox, and SomeResult but does not mention a source file or test. Start by tracing the available operations for those types from the example, especially copying to device and back after the kernel finishes. Done means providing a working end-to-end usage example.