Re: [Xen-users] usb passthrough

["Sergio Charpinel Jr." <sergiocharpinel@xxxxxxxxx>]

The problem is that When I use the usb and usbdevice options, I see
this in my domU:
domU:~# lsusb
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

It's a webcam, so I can't use it.. it do not create the /dev/video0
since i cant assing the driver to it.

Do you know what I can do?

Thanks

2010/2/26 chris <tknchris@xxxxxxxxx>:
> How is usb passthrough performance wise with a HVM domain? Is this
> something thats emulated? I'm curious how it would compare performance
> wise to passthrough of a usb controller card.
>
> - chris
>
> On Fri, Feb 26, 2010 at 1:33 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
>> On Fri, Feb 26, 2010 at 01:22:52PM -0500, chris wrote:
>>> Pasi,
>>>
>>> I know, my understanding was that pvusb was simply for exposing usb
>>> mass storage as a block device to the domain. I've never actually used
>>> it but I believe you can do this with a hvm domain without anything
>>> special. If anyone can actually confirm this it would be good to know
>>> :)
>>>
>>
>> There are two separate things:
>>
>> 1. the normal usb passthrough; this works for hvm guests without anything 
>> special by specifying usb=1 and usbdevice = []
>> 2. pvusb, which requires separate usbback driver in dom0, and xen+tools that 
>> has pvusb support, and usbfront driver in the guest.
>>
>> -- Pasi
>>
>>> As far as his original question, he needs vt-d to passthrough any
>>> physical device to a hvm domain.
>>>
>>> - chris
>>>
>>> On Fri, Feb 26, 2010 at 10:03 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
>>> > On Fri, Feb 26, 2010 at 10:00:34AM -0500, chris wrote:
>>> >> He said it was a HVM guest. I don't think you can passthrough to a hvm
>>> >> domain anything except usb storage with pvusb, correct?
>>> >>
>>> >
>>> > pvusb is different from the 'normal' usb=1 / usbdevice = [] stuff..
>>> >
>>> > I'm not totally sure what devices are supported with pvusb and with the 
>>> > normal usb passthrough.
>>> >
>>> > -- Pasi
>>> >
>>> >> On Fri, Feb 26, 2010 at 9:49 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
>>> >> > On Fri, Feb 26, 2010 at 09:49:38AM -0300, Sergio Charpinel Jr. wrote:
>>> >> >> Hi,
>>> >> >>
>>> >> >> I want to use a webcam in a HVM guest, but my dom0 doesnt support VT-d
>>> >> >> (just VT).
>>> >> >>
>>> >> >
>>> >> > USB passthrough doesn't require VT-d, it's only required for PCI device
>>> >> > passthrough to HVM guests.
>>> >> >
>>> >> >> I tried passing the parameters usb=1 and usbdevice = [ '..' ] and I
>>> >> >> could see an usb device in domU. But it does not know which device is.
>>> >> >>
>>> >> >> Which are the possibilites to do that? I prefer to use hvm machines,
>>> >> >> but if it is not possible, with PV machines it can work?
>>> >> >>
>>> >> >
>>> >> > With PV guest you could passthrough the whole USB controller (the PCI 
>>> >> > device)..
>>> >> >
>>> >> > -- Pasi
>>> >> >
>>> >> >
>>> >> > _______________________________________________
>>> >> > Xen-users mailing list
>>> >> > Xen-users@xxxxxxxxxxxxxxxxxxx
>>> >> > http://lists.xensource.com/xen-users
>>> >> >
>>> >
>>
>



-- 
Sergio Roberto Charpinel Jr.

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