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RE: [Xen-users] Is there a motherboard with paralell port and VT-d virtu

To: "'Sabuj Pattanayek'" <sabujp@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>, <Dustin.Henning@xxxxxxxxxxx>
Subject: RE: [Xen-users] Is there a motherboard with paralell port and VT-d virtualization?
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Date: Fri, 03 Sep 2010 13:22:43 -0600
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>>> On 2010/09/03 at 12:42, "Dustin Henning" <Dustin.Henning@xxxxxxxxxxx> 
>>> wrote: 
> I'm not even sure vt-d is necessary if the VM will be HVM.  I tried
> to look into this earlier today, because I actually need to pass through a
> parallel port, but I didn't have much luck figuring out how (for starters,
> no parallel port in lspci).
>       Dustin

If you're trying to use PCI devices in an HVM domU, then, yes, VTd is 
necessary.  PCI device forwarding without VTd can only be done in PV domUs.

There may be a way to pass through a parallel port without PCI.  One idea is to 
use a USB to LPT device and pass through the USB device, since USB passthrough 
has better support than does LPT passthrough right now.  On many motherboards, 
the LPT and COM devices are attached to a generic PCI device that may have 
several other peripherals attached.  So, unless you use a PCI or PCIe add-in 
card that has an LPT port on it, you may be out of luck.


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