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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1204283

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1204283

Title:
  parameters "nested" and "allow_unsafe_assigned_interrupts" of kernel
  modules kvm_intel resp. kvm do not work

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I noticed that after an upgrade from 13.04 to 13.10 the kvm virtual machines were started no more. After having a look to /var/log/syslog I discovered the following error messages:
  [ 1598.121581] kvm: Unknown parameter `allow_unsafe_assigned_interrupts'
  [ 1609.503790] kvm: Unknown parameter `allow_unsafe_assigned_interrupts'
  [ 1692.341512] kvm_intel: Unknown parameter `nested'

  The kernel module paramerters mentioned above work no  more. "modinfo" tells that the parameters should be available (as in 13.04) but they do not work. I can comment them out in the files where they are used (for example in /etc/modprobe.d/qemu-kvm.conf and in /etc/modprobe.d/qemu-system-x86.conf). "allow_unsafe_assigned_interrupts" is used in my own configuration file which is not part of any ubuntu package. After commenting out the parameters I get the following message (in /var/log/syslog):
  kvm_iommu_map_guest: No interrupt remapping support, disallowing device assignment. Re-enble with "allow_unsafe_assigned_interrupts=1" module option.

  Using the mentioned parameter gives me the error message stated at the
  beginning. A consequence of commenting out the parameters is that vga
  passthrough (with kvm) is now broken.

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