Public bug reported:
Binary package hint: kvm
Since kvm-83 in Jaunty, KVM/QEMU has supported /sys/ file-system access
to USB devices.
There is, however, an issue with insufficient permissions for a non-root
KVM/QEMU guest to access host USB devices.
There was discussion of this issue as part of bug #156085 "Could not
open /proc/bus/usb/devices" but no resolution.
In the PPA packages I built of kvm-74 which included my sys-fs patches I
also included a revised man-page that explained how to enable
permissions.
If the guest is running as non-root the permissions to /dev/bus/usb/*/*
will need altering
to allow the VM read/write access to the USB devices.
Create a new group "vm" and add users that require USB access for
VMs to it:
sudo addgroup vm
sudo addgroup $USER vm
Log-out/log-in to effect the new group membership.
Add a udev rule to assign USB devices to the vm group:
# Virtual Machine hypervisor access to USB devices
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", GROUP="vm"
SUBSYSTEM=="usb_device", GROUP="vm"
Save the file as /etc/udev/rules.d/41-vm-usb.rules and reload
udevd:
sudo /etc/init.d/udev restart
The guest virtual machines should now be able to access the USB devices
without root priv‐
ileges.
There was quite a bit of discussion between myself, Matt Zimmerman and
Martin Pitt from 2008-09-05 onwards about this but no decision made on
how to proceed.
This bug is intended to focus the attention on the permissions issue.
** Affects: kvm (Ubuntu)
Importance: Undecided
Status: New
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
** Also affects: qemu (Ubuntu)
Importance: Undecided
Status: New
--
Non-root guest doesn't have permission to access sys-fs USB devices
https://bugs.launchpad.net/bugs/331331
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