Xen devel - Mar 2009 - Where is the code for passthrough a PCI device to a PV?

Hi:

I am trying to understand the code for passthrough a PCI device to a
PV on i386 CPU. What code should I read? I know that
linux-xen\drivers\xen\pciback and pcifront is the backend and the
frontend for the PCI bus. But I think there should be some other code
to allow a domU to access the real device, right?
I found some code in xen/common/domctrl.c which do the access control
for the io memory. Is that all?
What happened when I use a PCI option for "xm create" command to
pass-through the device? Where is the code for starting a domU?
Thanks.

Regards,

Jiang

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