[SLOF] Keyboard not working when using XHCI as a USB host controller?

[Thomas Huth]

On 04/08/15 18:56, Segher Boessenkool wrote:
> On Tue, Aug 04, 2015 at 01:32:25PM +0200, Thomas Huth wrote:
>> When I use the following command line to start a guest:
>>
>>  qemu-system-ppc64 -machine pseries,accel=kvm,usb=off \
>> 	-device pci-ohci,id=usb,bus=pci.0,addr=0x2 \
>> 	-device usb-kbd,id=input0 -nographic -vga none
>>
>> ... SLOF correctly discoveres a keyboard during USB scan:
> 
>> However, when I start with an XHCI (or EHCI) controller
>> instead:
>>
>>  qemu-system-ppc64 -machine pseries,accel=kvm,usb=off \
>> 	-device nec-usb-xhci,id=usb,bus=pci.0,addr=0x2 \
>> 	-device usb-kbd,id=input0 -nographic -vga none
>>
>> ... SLOF does not discover any keyboard:
> 
> I don't know what those qemu options mean *exactly*, but I've
> never heard of a keyboard that talks SS (HS are rare too, most
> are FS these days) -- so the device should show up on a companion
> controller, which should be OHCI as well.  What host controllers
> were detected?

AFAIK for XHCI, you don't need these companion controllers anymore,
e.g. see:
https://en.wikipedia.org/wiki/Extensible_Host_Controller_Interface#Simplified_driver_architecture

So I think the keyboard should show up at the XHCI controller when I
only specify the XHCI - but I am also not very experienced with XHCI
yet, so I might also be wrong here.

 Thomas