Macro make_args 

macro_rules! make_args {
    ($code_expr:expr, $input_expr:expr, $output_expr:expr) => { ... };
    ($code_expr:expr, $input_ident:ident) => { ... };
}

Create a mshv_root_hvcall populated with hypercall parameters Arguments: 1. hypercall code 2. hv_input_* structure 3. hv_output_* structure (optional)