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[n3u20m4nc32 <n3u20m4nc32@xxxxxx>]

Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: kernel-bug

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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:
  New

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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