Re: [Xen-users] usb passthrough

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Feb 26, 2010 at 02:00:19PM -0500, chris wrote:
> 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.
> 

I believe pvusb is much faster than the normal usb passthrough..

02/2009:
http://www.xen.org/files/xensummit_oracle09/PVUSB.pdf

11/2009:
http://www.xen.org/files/xensummit_intel09/PVUSBStatusUpdate.pdf

Those might have more information about pvusb.

-- Pasi

> - 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
> >> >> >
> >> >
> >

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