Re: USB Passthrough

[BALATON Zoltan]

On Fri, 20 Mar 2020, Jd Lyons wrote:
> I’m trying to passthrough multiple USB devices to qemu-system-powerpc, a 
> USB keyboard and a USB mouse, from a linux host, however I can only get 
> one to work at a time, but not both.
>
> Not real sure what the issue is, has anyone tried to passthrough more 
> than one USB device to qemu-systems-ppc?

I haven't but I remember Howard reported some problems with multiple USB 
devices under MacOS on qemu-system-ppc but I can't find the message now. I 
wonder if that's related but not sure if passed through devices show up 
under the same OHCI controller than emulated ones. If so the problem may 
be in ohci-hcd not in passthrough but not sure how to debug that.

> Here is lsusb from the host
>
> lsusb
> Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 003 Device 003: ID 413c:2113 Dell Computer Corp.
> Bus 003 Device 002: ID 413c:3016 Dell Computer Corp. Optical 5-Button Wheel 
> Mouse
> Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 001 Device 012: ID 05ac:828d Apple, Inc.
> Bus 001 Device 004: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of 
> BCM2046 Bluetooth)
> Bus 001 Device 005: ID 413c:2105 Dell Computer Corp. Model L100 Keyboard
> Bus 001 Device 007: ID 413c:3016 Dell Computer Corp. Optical 5-Button Wheel 
> Mouse
> Bus 001 Device 003: ID 04b4:6560 Cypress Semiconductor Corp. CY7C65640 USB-2.0 
> "TetraHub"
> Bus 001 Device 002: ID 046d:c534 Logitech, Inc. Unifying Receiver
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>
> And this is how I’m trying to pass it to qemu:
>
> -usb -device usb-host,hostbus=1,hostaddr=5  -device 
> usb-host,hostbus=1,hostaddr=7

Maybe info usbhost and info usb from QEMU monitor would also be useful to 
get what's passed through, also lsusb from the guest?

Regards,
BALATON Zoltan