From mboxrd@z Thu Jan  1 00:00:00 1970
From: George Dunlap <dunlapg@umich.edu>
Subject: Re: [Bug] PVUSB, Ubuntu 12.04, Xen 4.1.2
Date: Wed, 29 May 2013 17:14:08 +0100
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To: Erwan PILLET <erwan.pillet@telecom-bretagne.eu>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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On Wed, May 29, 2013 at 4:08 PM, Erwan PILLET
<erwan.pillet@telecom-bretagne.eu> wrote:
> On 29 May 2013 15:25, George Dunlap <George.Dunlap@eu.citrix.com> wrote:
>>
>> On Wed, May 29, 2013 at 2:11 PM, Erwan PILLET
>> <erwan.pillet@telecom-bretagne.eu> wrote:
>> > Hi everyone,
>> >
>> > I installed xen from packages on Ubuntu 12.04, getting the version 4.1.2
>> > .
>> > I wanted to use pvusb which I understand was functional on this version
>> > to
>> > pass an USB hard drive to my DomU, but I only manage to get this error
>> > trying to attach the device to a domain.
>> >
>> > It may also be worth mentionning that "xm usb-hc-destroy mydomu 0"
>> > doesn't
>> > have any effect, so it doesn't give back any error (I get one if I try
>> > on an
>> > unregistered devId) but don't remove the host controller.
>> >
>> > So should pvusb be fonctionnal on this version of xen/xm ? If yes, any
>> > help
>> > would be highly appreciated.
>>
>> PVUSB requires support both from the toolstack and from the dom0
>> kernel.  I believe PVUSB is only available in "classic Xen" kernels
>> such as those supported by SuSE; I'm pretty sure that Ubuntu does not
>> have one.
>>
>> To see if usbback is present, you can do the following:
>>
>> ls /sys/bus/usb/drivers/usbback
>>
>> If it gives you an error, then the problem is that your Ubuntu dom0
>> kernel doesn't have PVUSB support.
>>
>>  -George
>
>
>
> First, thanks for your help !
> Indeed, there is no such file on my hypervisor, so I guess this kernel
> doesn't support PVUSB.
> Do you know if there is a way to patch the kernel to include this feature ?

I think there are some trees with PVUSB, but I don't think it's very
reliable.  Konrad will know more.

 -George