> I actually wouldn't have thought it'd be too bad: to do PIO, 
> all you'd need is to give the domU access to the relevant IO 
> port range (and maybe plumb an interrupt through).
>
> It's probably not much code but reasonable familiarity with 
> codebase of Xen and the tools would be pretty necessary.
Accessing serial ports directly from other domains work fine with the
unstable tree. If you search you should be able to find an email thread
about this some months back. Just compile a driver into the kernel and
give it access to the ioport range it needs.
Ian
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