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

To: "Jefferson E. Noxon" <jeff@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] How to Export COM port to guest domain
From: "Christopher Isip" <cmisip@xxxxxxxxx>
Date: Thu, 15 May 2008 16:47:34 -0400
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On Thu, May 15, 2008 at 2:59 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:

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.

Tony Johnson


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I installed mythtv but needed a way to control the motorola dvr via serial cable (usb to serial).  The way I managed to get this to work is to use ssh remote command execution.  Basically, the domU executes a script that runs in the dom0 to change channels.  I dont know if something similar would apply to your case.


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