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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" ]
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"
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.
-Nick
>>> On Thu, May 15, 2008 at 12:59 PM, "Jefferson E. Noxon" <jeff@xxxxxxxxxxxxxx> wrote:
I've run into the same problem, except that I need to provide serial
ports to a fully virtualized Windows guest.
This is my understanding:
You need Xen 3.2+, VT-d capable hardware, and PCI passthrough, and
probably a PCI-e serial adapter or a PCI-e USB adapter with a USB to
Serial dongle. VT-d won't let you pass through a legacy (non-Express)
PCI device without passing all of your other legacy PCI devices behind
the same bridge.
It's a shame that it isn't possible to pass USB or Serial devices
without VT-d.
I plan to get a PCI-e USB controller and a VT-d capable motherboard soon.
I hope someone proves me wrong!
Johnson, Tony M wrote:
> Greetings,
>
> Using Xen 3.1 and Fedora 7, is it possible to export the serial
> interface such that I can access
> external devices on COM1 or COM2?
>
> I am uncertain if PCI pass-thru is needed or if there's nothing to
> configure for this to work in
> a fully virtualized Linux guest.
>
> Any help would be greatly appreciated.
>
> Regards,
> Tony Johnson
>
>
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