Bug 329427 – <app-emulation/libvirt-0.8.5-r1: husb: open device Operation not permitted

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description fkhp 2010-07-22 15:00:34 UTC]

host usb device set up for guest, but guest can not find it. the same proble is reported before here: http://bugs.gentoo.org/show_bug.cgi?id=322169

# cat  /var/log/libvirt/qemu/XPE.log
LC_ALL=C PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/
bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.5.0 HOME=/root USER=root QEMU_AUDIO_DRV=n
one /usr/bin/kvm -S -M pc-0.12 -cpu core2duo -enable-kvm -m 512 -smp 1,sockets=1
,cores=2,threads=1 -name XPE -uuid e87de8fc-9c22-42df-a33a-85864cf3f490 -nodefau
lts -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/XPE.monitor,server,now
ait -mon chardev=monitor,mode=readline -rtc base=localtime -boot c -drive file=/
mnt/sdb2/vm/XPE/C.vmdk,if=none,id=drive-ide0-0-0,boot=on -device ide-drive,bus=i
de.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive file=/mnt/sdb2/vm/XPE/XPE.vm
dk,if=none,id=drive-ide0-0-1 -device ide-drive,bus=ide.0,unit=1,drive=drive-ide0
-0-1,id=ide0-0-1 -device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:9d:99:9c,bus
=pci.0,addr=0x5 -net tap,fd=39,vlan=0,name=hostnet0 -usb -vnc 127.0.0.1:0 -vga v
mware -device usb-host,hostbus=003,hostaddr=004,id=hostdev0 -device virtio-ballo
on-pci,id=balloon0,bus=pci.0,addr=0x3 
22:19:18.928: debug : virCgroupNew:542 : New group /libvirt/qemu/XPE
22:19:18.928: debug : virCgroupDetect:232 : Detected mount/mapping 0:cpu at /dev
/cgroup in 
22:19:18.928: debug : virCgroupDetect:232 : Detected mount/mapping 4:devices at 
/dev/cgroup in 
22:19:18.928: debug : virCgroupMakeGroup:484 : Make group /libvirt/qemu/XPE
22:19:18.929: debug : virCgroupMakeGroup:496 : Make controller /dev/cgroup/libvi
rt/qemu/XPE/
22:19:18.929: debug : virCgroupMakeGroup:496 : Make controller /dev/cgroup/libvi
rt/qemu/XPE/
22:19:18.929: debug : virCgroupSetValueStr:277 : Set value '/dev/cgroup/libvirt/
qemu/XPE/tasks' to '30321'
22:19:18.962: debug : virCgroupSetValueStr:277 : Set value '/dev/cgroup/libvirt/
qemu/XPE/tasks' to '30321'
22:19:18.962: debug : qemudInitCpuAffinity:2220 : Setting CPU affinity
22:19:18.963: debug : qemuSecurityDACSetProcessLabel:546 : Dropping privileges o
f VM to 0:0
husb: open device 3.4
/dev/bus/usb/003/004: Operation not permitted
husb: open device 3.4
/dev/bus/usb/003/004: Operation not permitted
husb: open device 3.4
/dev/bus/usb/003/004: Operation not permitted
husb: open device 3.4
/dev/bus/usb/003/004: Operation not permitted
husb: open device 3.4
/dev/bus/usb/003/004: Operation not permitted
husb: open device 3.4
/dev/bus/usb/003/004: Operation not permitted
husb: open device 3.4
/dev/bus/usb/003/004: Operation not permitted
husb: open device 3.4
/dev/bus/usb/003/004: Operation not permitted


Reproducible: Always

[Comment 1 fkhp 2010-07-29 11:38:20 UTC]

this is because cgroup enabled and usb is blacklisted, so libviirtd can not open it. the usb need to be added to cgroup devices.

===============/etc/libvirt/qemu.conf:
# What cgroup controllers to make use of with QEMU guests
#
#  - 'cpu' - use for schedular tunables
#  - 'devices' - use for device whitelisting
#
# NB, even if configured here, they won't be used unless
# the adminsitrator has mounted cgroups. eg
#
#  mkdir /dev/cgroup
#  mount -t cgroup -o devices,cpu none /dev/cgroup
#
# They can be mounted anywhere, and different controlers
# can be mounted in different locations. libvirt will detect
# where they are located.
#
# cgroup_controllers = [ "cpu", "devices" ]

# This is the basic set of devices allowed / required by
# all virtual machines.
#
# As well as this, any configured block backed disks,
# all sound device, and all PTY devices are allowed.
#
# This will only need setting if newer QEMU suddenly
# wants some device we don't already know a bout.
#
#cgroup_device_acl = [
#    "/dev/null", "/dev/full", "/dev/zero",
#    "/dev/random", "/dev/urandom",
#    "/dev/ptmx", "/dev/kvm", "/dev/kqemu",
#    "/dev/rtc", "/dev/hpet", "/dev/net/tun",
#]

[Comment 2 fkhp 2010-08-31 03:15:37 UTC]

*** Bug 322169 has been marked as a duplicate of this bug. ***

[Comment 3 fkhp 2010-09-12 03:55:07 UTC]

if disable cgroup still does not help. then try to compile usbmon kernel module and modprobe usbmon before start the vm might resolv the USB problem. this resolve the USB problem here.

[Comment 4 Diego Elio Pettenò (RETIRED) 2010-10-30 17:54:26 UTC]

Fixed in 0.8.5-r1 and sent upstream.