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[Qemu-devel] [Bug 1392504] Re: USB Passthrough is not working anymore

From: Kelvin Middleton
Subject: [Qemu-devel] [Bug 1392504] Re: USB Passthrough is not working anymore
Date: Sat, 21 Mar 2015 10:18:48 -0000

I don't run apparmor.

Ubuntu 14.10 host

Have this same issue with USB Host Attachment on Windows and Linux guests.
USB Redirection using SPICE is unaffected and works as expected.

Libvirt logs show...
libusbx: error [_get_usbfs_fd] libusbx couldn't open USB device 
/dev/bus/usb/003/006: Permission denied
libusbx: error [_get_usbfs_fd] libusbx requires write access to USB device 

'chown libvirt-qemu:kvm /dev/bus/usb/003/006' solves the problem and USB
Host Attachment now works again.

Host dmesg shows...
usb 3-13: reset high-speed USB device number 9 using xhci_hcd
[ 3346.483029] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with 
disabled ep ffff8807ba9beb40
...USB device needs to be physically detached and re-attached for host to see 

Tested this with a Sandisk Cruzer Blade 16GB and a Logitech HD C525.

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  USB Passthrough is not working anymore

Status in QEMU:
Status in qemu package in Ubuntu:

Bug description:
  After upgrading from Ubuntu 14.04 to Ubuntu 14.10 USB passthrough in
  QEMU (version is now 2.1.0 - Debian2.1+dfsg-4ubuntu6.1) is not working
  any more. Already tried to remove and attach the USB devices. I use 1
  USB2 HDD  +  1 USB3 HDD to a virtual linux machine; 1 USB2 HDD to a
  virual FNAS machine and a USB 2camera to virtual Win7 machine. All
  these devices are not working any more.

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