Bug 597947 - QEMU could not open USB device
QEMU could not open USB device
Status: CLOSED CURRENTRELEASE
Product: Virtualization Tools
Classification: Community
Component: libvirt (Show other bugs)
unspecified
x86_64 Linux
low Severity medium
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Assigned To: Libvirt Maintainers
: HardwareEnablement
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2010-05-31 00:57 EDT by fkhp101
Modified: 2015-03-16 11:25 EDT (History)
5 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Environment:
gentoo linux
Last Closed: 2015-03-16 11:25:09 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description fkhp101 2010-05-31 00:57:35 EDT
Description of problem:
vm configure to use usb device but can not use it.

log message in /var/log/libvirt/qemu/vm.log
husb: open device 5.3
/dev/bus/usb/005/003: Operation not permitted
Version-Release number of selected component (if applicable):


How reproducible:


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Comment 1 fkhp101 2010-08-20 02:06:07 EDT
this is because cgroup enabled and usb is blacklisted, so libviirtd can not
open it. the usb need to be added to cgroup devices, or do not enable cgroup.

http://bugs.gentoo.org/show_bug.cgi?id=329427#c1
Comment 2 Daniel Berrange 2010-08-20 05:54:42 EDT
Ah, I forgot that USB devices appear as character device nodes. libvirt will need to be taught to set those up with cgroups like it already does for disks, serial ports & parallel ports.
Comment 3 Ján Tomko 2015-03-16 11:25:09 EDT
Fixed upstream by:
commit 5919afe3c664df9bacc47055bf7ebf320530582c
Author:     Diego Elio Pettenò <flameeyes@gmail.com>
AuthorDate: 2010-11-01 12:03:16 +0100
Commit:     Eric Blake <eblake@redhat.com>
CommitDate: 2010-11-01 10:19:51 -0600

    qemu: add the USB devices to the cgroup whitelist
    
    Make sure that the QEmu process within the cgroup can access the device
    file for the USB device that has to be connected to the virtual domain.

git describe: v0.8.5-6-g5919afe contains: v0.8.6~192

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