Re: [Xen-devel] [PATCH 4/4] xen/public: arm: rework the macro set_xen_guest_handle_raw

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Jan Beulich writes ("Re: [PATCH 4/4] xen/public: arm: rework the macro 
set_xen_guest_handle_raw"):
> On 04.11.15 at 17:50, <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> > If we don't provide a get_xen_guest_handle, a kernel developer will be
> > sorely tempted to make one.
> 
> What use would it be to them? Kernels only write handles, they
> shouldn't have a need for reading them.

I foresee situations where a kernel might like to update a proposed
hypercall argument structure in place, which might involve reading the
handles.

Ian.

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