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[Xen-devel] Call hypercall straightly from user space

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
Subject: [Xen-devel] Call hypercall straightly from user space
From: "Xu, Anthony" <anthony.xu@xxxxxxxxx>
Date: Sat, 30 Dec 2006 16:03:19 +0800
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-topic: [Xen-devel] Call hypercall straightly from user space
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
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

If you agree.
I would like to do this.


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