[Xen-devel] Call hypercall straightly from user space

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

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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