> As you might guess all other USB devices that are connected to the same Bus / 
> same USB-Controller will also be "lost" to the sys-net VM.
> On the Lenovo W540 notebook this means that 3 out of 4 USB ports are passed 
> through to sys-net.
> If you enable USB3 in the BIOS you will even loose all 4 USB ports to 
> sys-net. I have disabled USB3 in the BIOS and will use a USB3-PCMCIA Express 
> Card to have USB3 available if I need it (as suggested in another thread)

On a T540p, I loose all USB ports to sys-net, making the whole notebook quite 
unusable, since you cannot connect mice or disks any more.

Everything seems to be on one bus (003):

[user@dom0 ~]$ lsusb
Bus 002 Device 002: ID 8087:8000 Intel Corp. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 002: ID 17ef:1010 Lenovo 
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 008: ID 046d:c526 Logitech, Inc. Nano Receiver
Bus 003 Device 006: ID 17ef:100f Lenovo 
Bus 003 Device 004: ID 17ef:1010 Lenovo 
Bus 003 Device 003: ID 138a:0017 Validity Sensors, Inc. Fingerprint Reader
Bus 003 Device 002: ID 058f:9540 Alcor Micro Corp. AU9540 Smartcard Reader
Bus 003 Device 009: ID 5986:026a Acer, Inc 
Bus 003 Device 007: ID 8087:07da Intel Corp. 
Bus 003 Device 005: ID 1199:a001 Sierra Wireless, Inc. 
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

[user@dom0 ~]$ readlink /sys/bus/usb/devices/usb?
../../../devices/pci0000:00/0000:00:1a.0/usb1
../../../devices/pci0000:00/0000:00:1d.0/usb2
../../../devices/pci0000:00/0000:00:14.0/usb3
../../../devices/pci0000:00/0000:00:14.0/usb4

[user@dom0 ~]$ lspci | grep USB
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family 
USB xHCI (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family 
USB EHCI #2 (rev 04)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family 
USB EHCI #1 (rev 04)

Why do you have to disable USB3 in BIOS?
And what about bus 001 and 002, where may they be connected to?

If I delegate device 00:14.0 to sys-net, I cannot use any physical USB port in 
dom0 any more.

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