Re: USB passthrough in QEMU

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Mar 25, 2025 at 12:54:50AM +0500, Vitaly Shevtsov wrote:
> I'm sorry, but it still doesn't work :)
> 
> Do you run QEMU as root to be able to pass USB devices or as a non-root user?
> 
> I use the following to run VM in QEMU:
> qemu-system-x86_64 -m 4G -cpu host -smp 4 -M q35 -accel nvmm -usb
> -device usb-host -drive file=vm.qcow2 -nic user,model=e1000 -rtc
> base=localtime
> And I get the this error:
> qemu-system-x86_64: libusb_kernel_driver_active: -12 [NOT_SUPPORTED]
> 
> Whichever bus/port I try, it always ends up with this error? What did I miss?

What device do you try to pass though ? It needs to show up as ugen,
and the user running qemu needs read/write access to /dev/ugen*

I used something like:
  -usb -device usb-host,bus=usb-bus.0,port=1,vendorid=0x1d50,productid=0x606f

I think I also got the error -12, but that's not the problem.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--