Re: [Xen-devel] [PATCH 02/10] xen: make GUEST_HANDLE_64() and uint64_aligned_t available everywhere

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.06.13 at 16:48, David Vrabel <david.vrabel@xxxxxxxxxx> wrote:
> I want the structure to be identical for 32-bit and 64-bit guests so
> compat code is not required in the hypervisor.
> 
> Without a macro like XEN_GUEST_HANDLE_64() how do you suggest the
> structure is defined so the field is sized correctly (i.e., 8 bytes)?
> 
> Are you suggesting something like?
> 
> typedef struct xen_kexec_load {
>     uint8_t  type;        /* One of KEXEC_TYPE_* */
>     uint8_t  _pad;
>     uint16_t arch;        /* ELF machine type (EM_*). */
>     uint32_t nr_segments;
>     union {
>         XEN_GUEST_HANDLE(xen_kexec_segment_t) segments;
>         uint64_t _qword;
>     } u;
>     uint64_t entry_maddr; /* image entry point machine address. */
> } xen_kexec_load_t;

Yes - there are already other cases similar to this in the public
headers, for example struct vcpu_register_runstate_memory_area
and struct vcpu_register_time_memory_area.

Jan


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