Re: [Xen-devel] [PATCH v3 06/15] xen/arm: introduce guest_handle_for_field()

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Sun, 6 Jan 2019, Christopher Clark wrote:
> ARM port of c/s bb544585: "introduce guest_handle_for_field()"
> 
> This helper turns a field of a GUEST_HANDLE into a GUEST_HANDLE.
> 
> Signed-off-by: Christopher Clark <christopher.clark6@xxxxxxxxxxxxxx>
> Reviewed-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

> ---
>  xen/include/asm-arm/guest_access.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/xen/include/asm-arm/guest_access.h 
> b/xen/include/asm-arm/guest_access.h
> index 224d2a0..8997a1c 100644
> --- a/xen/include/asm-arm/guest_access.h
> +++ b/xen/include/asm-arm/guest_access.h
> @@ -63,6 +63,9 @@ int access_guest_memory_by_ipa(struct domain *d, paddr_t 
> ipa, void *buf,
>      _y;                                                     \
>  })
>  
> +#define guest_handle_for_field(hnd, type, fld)          \
> +    ((XEN_GUEST_HANDLE(type)) { &(hnd).p->fld })
> +
>  #define guest_handle_from_ptr(ptr, type)        \
>      ((XEN_GUEST_HANDLE_PARAM(type)) { (type *)ptr })
>  #define const_guest_handle_from_ptr(ptr, type)  \
> -- 
> 2.7.4
> 

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