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Excerpts from Dmitry Mescheryakov's message of 2013-12-10 08:25:26 -0800:
> And one more thing,
> 
> Sandy Walsh pointed to the client Rackspace developed and use - [1], [2].
> Its design is somewhat different and can be expressed by the following
> formulae:
> 
> App -> Host (XenStore) <-> Guest Agent
> 
> (taken from the wiki [3])
> 
> It has an obvious disadvantage - it is hypervisor dependent and currently
> implemented for Xen only. On the other hand such design should not have
> shared facility vulnerability as Agent accesses the server not directly but
> via XenStore (which AFAIU is compute node based).
> 

I don't actually see any advantage to this approach. It seems to me that
it would be simpler to expose and manage a single network protocol than
it would be to expose hypervisor level communications for all hypervisors.