[Xen-users] Pass through serial keyboard/mouse devices to domU

[jrs@xxxxxx]

I'm setting up Xen 4.1.1 on a laptop running CentOS 6, and attempting  
to pass through the trackpad/keyboard to a domU.  The devices seem to  
be wired via PS/2, showing up in /sys/bus/serio and using i8042.  My  
familiarity with busses other than PCI and USB is rather lacking, but  
insofar as I can tell, it seems that these are effectively serial  
devices, and so should be capable of being passed through via the  
irq/ioport settings in domU config.  I tried using irqs [1,12] and  
ioports ['60','64'], but no luck.  Checking /proc/irq/1/spurious shows  
that the system dom0 appears to be receiving IRQs, but they aren't  
being sent to the domU.
It's possible I'm barking up the wrong tree entirely with that, but  
I've been messing around with this for days and haven't made any  
headway.  As the host machine is a laptop, switching to a USB keyboard  
for standard use is not an option (although using a USB keyboard does  
of course work), and so getting these specific devices is the only  
working solution.  That said, if something more involved than  
passthrough is required to make this work, that's fine - I briefly  
entertained using a headless RBF session to just pipe input to the  
guest, but that required doing a lot of processing for mouse  
positioning.
Any help would be vastly appreciated - this is the last step in a  
couple weeks worth of effort.
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