Venkat, the Xenbus drivers haven’t
been ported for HVM’s yet and I feel any out of band mechanism can be
used to communicate the grant reference. Xenstore can be accessed through the
store_mfn page passed to a PV but is unavailable to an HVM so you can’t
write to the Xenstore from an HVM because neither the store_mfn nor the event
channel is available there.
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Kumar, Venkat
Sent: Thursday, August 28, 2008
Subject: [Xen-devel] HVM Domain
Grant Reference For Sharing Memory
HVM need not execute a Hypercall to offer a page instead it
will fill the appropriate grant reference structure inside the grant table from
the obtained index in the grant table.
But how will the HVM guest pass the grant reference to a PV
guest so that he can map it.
Is it through Xenstore?
If it is through Xenstore, is there a hypercall involved?
If it is not through Xenstore, is there any other way which
is currently supported?