Hope I'm not mistaken, but I believe this discussion only revolves
around the fact that you don't need hypercalls to *share* pages. The
gnttab hypercall interface is only needed to *map* shared pages, not to
let other domains access a hvm's memory.
Sharing a page only requires the owner to set appropriate permissions in
her own grant table. That's just a bit of store and cmpxchg. No
hypercalling involved.
Cheers,
Daniel
On Wed, 2008年08月20日 at 14:03 +0800, Kumar, Venkat wrote:
> I was following an email chain in the xen mailing list on HVM
> hypercalls on grant tables and the email chain link is below
>
> http://lists.xensource.com/archives/html/xen-devel/2007-03/msg00688.html 
>
>
>
> This link says that we need not required hypercalls to share memory
> b/w HVM’s.
>
>
>
> But as far as my understanding of sharing memory is concerned, I think
> the memory is shared using grant table mechanism and we would need
> Hypercall support related to grant tables to make this possible.
>
>
>
> Correct me if I am wrong.
>
>
>
> Or is there any other way of sharing memory or Inter domain
> communication?
>
>
>
> Thx,
>
> Venkat
>
> ================================
>
> Venkata Kumar Duvvuru,
>
> LSI Engenio,
>
> Adv. Development,
>
> Bangalore.
>
> Mob: +91-9880318542
>
> Off : +91-80-41978700 ( Extn : 3544 )
>
> ================================
>
>
>
>
>
> _______________________________________________
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-- 
Daniel Stodden
LRR - Lehrstuhl für Rechnertechnik und Rechnerorganisation
Institut für Informatik der TU München D-85748 Garching
http://www.lrr.in.tum.de/~stodden mailto:stodden@xxxxxxxxxx
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