How to implement a simple driver in Windows with xen?

["xyu.dai" <xyu.dai@gmail.com>]

Hi. I'm trying to implement dual-way communication between processes in
domain0 and GuestOS.
I'm trying to setup a model like diagram below.

     Domain0                                     GuestOS(windows)
  backend-driver <--> evtchn/share page <-->  frontend-driver
         ^                                                       ^
         |  r/w                                                  | r/w
         v                                                        v
   process A                                              process B

Now, I'm wondering how to write a simple driver in windows with xen. What
the frontend-driver do is just accept several userspace IRPs (read/write...)
and send message to backend-driver, I don't know how to code detaily. 
I've read part of the win-pv drivers, but most of them are constructed in
model like miniport or sth else, which is bind to some device like
network,disk.

Could anyone give me some advice or sample code? 

Thanks a lot!
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