On 2014-06-17 07:24, Paolo Bonzini wrote:
> Il 15/06/2014 08:20, Jan Kiszka ha scritto:
>>> > I think implementing Xen hypercalls in jailhouse for grant table and
>>> > event channels would actually make a lot of sense.  The Xen
>>> > implementation is 2.5kLOC and I think it should be possible to compact
>>> > it noticeably, especially if you limit yourself to 64-bit guests.
>> At least the grant table model seems unsuited for Jailhouse. It allows a
>> guest to influence the mapping of another guest during runtime. This we
>> want (or even have) to avoid in Jailhouse.
> 
> IIRC implementing the grant table hypercalls with copies is inefficient
> but valid.

Back to #1: This is what Rusty is suggesting for virtio. Nothing to win
with grant tables then. And if we really have to copy, I would prefer to
use a standard.

I guess we need to play with prototypes to assess feasibility and impact
on existing code.

Jan