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

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • 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
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Openpgp: id=5E4D6A46

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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