Re: [Xen-devel] Designing the N-level event channel registration interface

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-01-11 at 12:48 +0000, Jan Beulich wrote:
> >>> On 11.01.13 at 13:34, Wei Liu <Wei.Liu2@xxxxxxxxxx> wrote:
> > Ian suggested I use XEN_GUEST_HANDLE_64 to get 64-bit clean version and
> > avoid compat layer.
> 
> So far these exist only in tools interfaces, and the way x86's
> set_xen_guest_handle() works currently you wouldn't even be
> permitted to use those (as the upper halves would remain
> uninitialized, hence expected to fail the validity checks within
> the hypervisor).

Yes, if we extend the usage we'd need to add the initialisation of the
other half.

> Also, they're inefficient in terms of kernel side use (albeit in the
> case here we're talking about only one time setup code).

Right.



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