Re: [Qemu-devel] USB passthrough in qemu

[Michal Suchanek]

On 13 June 2014 16:51, Gerd Hoffmann <address@hidden> wrote:
>   Hi,
>
>> Ok, so without a machine description that has ehci or xhci as default
>> device you cannot use -usbdevice and with -device you get a magic
>> incantation like -device usb-ehci,id=usb,bus=pci.0,addr=0x4 -device
>> usb-host,vendorid=0x0b95,productid=0x772b,id=hostdev0,bus=usb.0 which
>> is overly long for TheRightThing(tm) and as I understand it you have
>> to
>
> qemu -device nec-usb-xhci \
>      -device usb-host,vendorid=0x0b95,productid=0x772b
>
> Works just fine too.  As long as there is a single bus only there is no
> need to explicitly specify which you want.  As long as you don't care
> which port your devices are attached to you don't need to specify that.
> And as long as you don't want/need refer to your devices you also don't
> have to give them an id.

ok, that's something that could work in the future.

Attaching the passthru device and usb-tablet to xhci hub in in qemu
2.0 results in qemu aborting when Windows probes the xhci bus. Also
the driver Windows attaches after another boot is Renesas.

>
>> 1) know if the device is usb1/2/3 because here you specify by hand to
>> what bus it is attached to and it is not going to be automatically
>> attached to the correct bus
>
> Wrong.  Create a bus which can handle multiple usb speeds (xhci will do
> for 1+2+3, ehci+companions will do for 1+2).  Use that.  Done.
>
> And we had that topic in this thread already, so you know this.  Please
> stop your false claims.

ok, so this should work with -usbdevice *and* -device

>
>> 2) in case you have more than 1 device count usb ports and manually
>> assign each to unique port number and count pci ports to know where to
>> attach the ehci controller
>
> You don't have to specify the port, qemu will happily pick a free one
> automatically for you then.

Indeed, weeding out addr and multifunction in ich9-ehci-uhci.cfg still
results in working setup.

With -net none -readconfig /scratch/qemu/ehci.cfg -device
usb-host,vendorid=0x0b95,productid=0x772b -device
usb-host,vendorid=0x0a12,productid=0x0001 -device usb-tablet

I get networking over the USB Ethernet adaptor (which works only on
ehci), the qemu tablet gets attached to ehci and the BT dongle to
uhci.

Thanks

Michal