[Xen-devel] questions regarding interdomain communication and xen-guest communication

[Aastha Mehta <aasthakm@xxxxxxxxx>]

Hello,

I would like to clarify certain things about the communication
mechanisms between guests and between xen and guest domains.

If there is an interdomain event channel set up between two guests, do
they communicate directly with each other, bypassing the hypervisor
completely? In case of an asynchronous I/O does one guest have to
register its callbacks with the other guest directly?
Or does one guest hypercall into xen, which then upcalls into the
other guest and then transfer reply in the reverse using another pair
of hypercall and upcall? Can event channels be set up ad hoc between
two, for example, dom0 and a guest domain? Or can they only be used by
drivers, e.g. between network frontend and backend drivers?

Regarding xen -- domain communication: how can xen send some request
to dom0 for some operation that needs to be performed in the dom0 and
get back results from the dom0? Does such a communication have to be
synchronous?

Thanks,
Aastha.

-- 
Aastha Mehta
MPI-SWS, Germany
E-mail: aasthakm@xxxxxxxxxxx

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