This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


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

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] How to Export COM port to guest domain
From: "Jefferson E. Noxon" <jeff@xxxxxxxxxxxxxx>
Date: Thu, 15 May 2008 13:59:13 -0500
Delivery-date: Thu, 15 May 2008 11:59:58 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <3DFFB0670A395946974CE996C72073241304F71F@xxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Openpgp: id=5E4D6A46
References: <3DFFB0670A395946974CE996C72073241304F71F@xxxxxxxxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20080421 Thunderbird/ ThunderBrowse/ Mnenhy/
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


Xen-users mailing list

Xen-users mailing list

<Prev in Thread] Current Thread [Next in Thread>