[Qemu-devel] [Bug 156085] Re: Could not open /proc/bus/usb/devices

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/fxload

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Could not open /proc/bus/usb/devices
https://bugs.launchpad.net/bugs/156085
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Status in QEMU: Fix Released
Status in Virtualbox: Fix Released
Status in “apcupsd” package in Ubuntu: Invalid
Status in “fxload” package in Ubuntu: Fix Released
Status in “kvm” package in Ubuntu: Fix Released
Status in “madfuload” package in Ubuntu: Fix Released
Status in “midisport-firmware” package in Ubuntu: Fix Released
Status in “qemu” package in Ubuntu: Fix Released
Status in “sysvinit” package in Ubuntu: Won't Fix
Status in “usbview” package in Ubuntu: Triaged
Status in “vmware-server” package in Ubuntu: Invalid
Status in “apcupsd” source package in Gutsy: Invalid
Status in “fxload” source package in Gutsy: Won't Fix
Status in “kvm” source package in Gutsy: Won't Fix
Status in “madfuload” source package in Gutsy: Won't Fix
Status in “midisport-firmware” source package in Gutsy: Won't Fix
Status in “qemu” source package in Gutsy: Won't Fix
Status in “sysvinit” source package in Gutsy: Invalid
Status in “usbview” source package in Gutsy: Won't Fix
Status in “vmware-server” source package in Gutsy: Won't Fix
Status in “apcupsd” source package in Hardy: Invalid
Status in “fxload” source package in Hardy: New
Status in “kvm” source package in Hardy: Confirmed
Status in “madfuload” source package in Hardy: New
Status in “midisport-firmware” source package in Hardy: New
Status in “qemu” source package in Hardy: Confirmed
Status in “sysvinit” source package in Hardy: Won't Fix
Status in “usbview” source package in Hardy: Confirmed
Status in “vmware-server” source package in Hardy: New
Status in “apcupsd” source package in Jaunty: Invalid
Status in “fxload” source package in Jaunty: Fix Released
Status in “kvm” source package in Jaunty: Fix Released
Status in “madfuload” source package in Jaunty: Fix Released
Status in “midisport-firmware” source package in Jaunty: Fix Released
Status in “qemu” source package in Jaunty: Fix Released
Status in “sysvinit” source package in Jaunty: Won't Fix
Status in “usbview” source package in Jaunty: Won't Fix
Status in “vmware-server” source package in Jaunty: Invalid
Status in “usbview” package in Debian: New
Status in “qemu” package in openSUSE: Fix Released

Bug description:
On Gutsy 64-bit using qemu/kvm  (also VirtualBox and, I believe, VMWare) and 
the "-usb" switch no USB devices are available since qemu/kvm looks for the 
description of them in the 'devices' file of a usbfs mount at

/proc/bus/usb/

but the code previously providing the usbfs mount that is created at start-up 
via /etc/rcS/S11mountdevsubfs.sh --> /etc/init.d/mountdevsubfs.sh was commented 
out. The USB devices are now reported at

/dev/bus/usb/

but currently there is no usbfs file-system mounted/linked there to provide the 
'devices' text-file.

qemu/kvm reports:

qemuctl -qemu vdeq kvm  -boot c -m 512 -hda 
/home/all/VirtualMachines/WindowsXP-SP2.ovl -net nic,vlan=0 -soundhw es1370 
-usb -net vde

info usbhost
Could not open /proc/bus/usb/devices

$ ls -l /proc/bus/usb
total 0


WORKAROUND:
To re-enable it edit the file '/etc/init.d/mountdevsubfs.sh' and uncomment the 
code after line 40 so it reads:
 # Magic to make /proc/bus/usb work
  #
  mkdir -p /dev/bus/usb/.usbfs
  domount usbfs "" /dev/bus/usb/.usbfs -obusmode=0700,devmode=0600,listmode=0644
  ln -s .usbfs/devices /dev/bus/usb/devices
  mount --rbind /dev/bus/usb /proc/bus/usb
Execute the script manually to enable the change before a system reboot:
$ sudo /etc/init.d/mountdevsubfs.sh start