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Re: [Xen-devel] usb device in domU status

To: Hans-Christian Armingeon <johnny@xxxxxxxxxx>
Subject: Re: [Xen-devel] usb device in domU status
From: Harry Butterworth <harry@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 24 Mar 2006 14:50:16 +0000
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On Thu, 2006-03-23 at 01:13 +0100, Hans-Christian Armingeon wrote:
> Hi,
> I searched the archives for information about USB devices in domU, but I 
> didn't understand everything.
> Are the changes in the current linux-2.6 hg tree, or do I need some patches? 
> I tried the current xen-unstable hg tree.

This is the most recent version of the patch.


> I have a
> usb = [ 'path=4-4' ]
> line in my config.
> xm create says:
> Error: Device 0 (usb) yould not be connected. Hotplug scripts not working.

The patch contains updates to the hotplug scripts which are required.
It was tested with udev.

> What am I doing wrong?

Maybe you don't have the hotplug scripts from the above patch installed.
Maybe you are using hotplug and not udev (this used to work but recently
I was testing with udev).

> It it possible, to pass an usb port to a domU, and to this port I connect an 
> USB hub, and all the devices on the hub will be available in a domU?

I don't think that will work.  You can export all the ports on the hub
individually to domU instead though which I think gives you pretty much
the same function.

> What happens, if someone plugs a device off, that is exportet to a domU?

You can hot plug and unplug devices to domU and the domU will see them
come and go and the hotplug scripts in domU should get invoked.

> Thanks in advance,
> Johnny
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