Re: [Xen-users] How to Export COM port to guest domain

["Jefferson E. Noxon" <jeff@xxxxxxxxxxxxxx>]

Nick Couchman wrote:
> I don't think it's quite this hard.  For a Linux domU, here are the 
> lines I add to export the com port to my domU:
> irq=[ 4 ]
>
> ioports=[ "3f8-3ff" ]
The original post was asking about fully virtualized guests.  I believe 
this suggestion only works for PV guests.
> For the Windows HVM domU end of things, it's been a while since I did 
> it, but I'm pretty sure just adding the following got me the necessary 
> access to the com port:
> serial="/dev/ttyS0"
I think that may actually work.  I remember having a conversation with 
someone else about this now.  My device manager does indeed show COM1, 
which according to QEMU is redirected to /dev/ttyS0.
Now I just need several more COM ports, and I'm in business.

> My servers don't support VT-d and I'm not running Xen 3.2.  As far as 
> USB devices go, I'm not sure, but my example domU files have things like 
> "usbdevice='xxx'" - I'm not sure what types of USB devices you can push 
> through, maybe just the default mouse and tablet support.
There is currently no support in Xen for passing USB devices to 
fully-virtualized guests.  With VT-d you can pass an entire controller. 
 And of course, even without VT-d you can pass a USB controller to a PV 
guest.
Regards,

Jeff

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