Re: [Xen-devel] [...], USB-passthru only works with qemu-traditional

[Jason Andryuk <jandryuk@xxxxxxxxx>]

On Tue, Jan 7, 2020 at 2:36 PM Steffen Einsle <einsle@xxxxxxxxxx> wrote:
>
> Hello,
>
> you're probably right about the malformed commandline for USB-passthru:
> With upstream qemu I get
>
> qemu-system-x86_64: -usbdevice tablet: '-usbdevice' is deprecated,
> please use '-device usb-...' instead
> qemu-system-x86_64: -usbdevice host:0d46:3003: '-usbdevice' is
> deprecated, please use '-device usb-...' instead
> qemu-system-x86_64: -usbdevice host:0d46:3003: could not add USB device
> 'host:0d46:3003'

QEMU (as of 2.12?) no longer parses 'host:0d46:3003'.  You need to
supply arguments like this:
-device usb-host,vendorid=0x0d46,productid=0x3003

qemu-system-x86_64 -device qemu-xhci -device
usb-host,vendorid=0x0d46,productid=0x3003

libxl needs to be modified to change the arguments.  You *might* be
able to sneak around it by settings
device_model_args=["-device
usb-host,vendorid=0x0d46,productid=0x3003"] and dropping the host
device from usbdevice.
It may need to be
device_model_args=["-device","usb-host,vendorid=0x0d46,productid=0x3003"]
if spaces in arguments aren't handled properly.

Regards,
Jason

> I'm not quite sure if this ever worked (without trad), but if it did, it
> was some years ago... perhaps at the times of xen 4.1 ?
>
>
> Am 06.01.2020 um 11:23 schrieb Durrant, Paul:
> >> -----Original Message-----
> >> From: win-pv-devel <win-pv-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf
> >> Of Steffen Einsle
> >> Sent: 05 January 2020 00:44
> >> To: win-pv-devel@xxxxxxxxxxxxxxxxxxxx
> >> Subject: [win-pv-devel] Driver 9.0.0 no keyboard in vncviewer, USB-
> >> passthru only with qemu-traditional
> >>
> >> Hello,
> >>
> >> I just installed a Windows 2019 Server with the new 9.0.0 PV drivers
> >> under xen 4.12.1. I use gentoo and since I need usb-passthru I have to
> >> use the qemu-traditional useflag (or device_model_version =
> >> 'qemu-xen-traditional').
> >>
> >> - USB-passthru works only with qemu-traditional
> >    That seems odd, but I guess nor many people use USB passthru so it could 
> > have got broken with upstream somewhere along the way.
> >> Is there a general trick to get USB-passthru working with qemu-xen?
> >> (without qemu-traditional my usbdevice = ['tablet', 'host:0d46:3003']
> >> prevents domu creation - device-model-exited-error)
> >    I think that is probably something to post on xen-users or xen-devel. 
> > Have you ever had USB passthrough working with upstream QEMU? There's 
> > nothing at https://wiki.xenproject.org/wiki/Xen_USB_Passthrough to suggest 
> > it is only supported using trad so if it is broken it needs fixing. What 
> > does your qemu log (under /var/log/xen) say was the reason for failure? 
> > (I'm guessing it was probably malformed command line, which would mean 
> > there's a bug in libxl).
> > Paul
>
>
>
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