Hi keir,
As you mention before, we may call hypercall straightly from user space 
rather than bouncing through guest kernel.
I'm planning to do this.
I want to modifty three hypercalls first.( I think they are frequently
used).
1. send_event_pending,
2. hvm_set_isa_irq_level,
3. hvm_set_pci_intx_level.
In the first hypercall, it sends port through pointer rather than value.
Thus it's difficult to call send_event_pending from user space due to 
there is no similar mechanism as xencomm in user space.
Is it possible we pass port through value in send_event_pending
hypercall?
If you agree.
I would like to do this.
--Anthony
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