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.
---
ApportVersion: 2.11-0ubuntu1
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory
DistroRelease: Ubuntu 13.10
HibernationDevice: RESUME=UUID=cb1c6138-f7fa-4a4d-afc1-649b5475bb1f
InstallationDate: Installed on 2012-09-15 (311 days ago)
InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
MachineType: Hewlett-Packard HP xw6600 Workstation
MarkForUpload: True
Package: linux (not installed)
ProcEnviron:
TERM=linux
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.10.0-4-generic root=/dev/mapper/fast-medusa_root ro intel_iommu=on console=tty1 console=ttyS0,38400n8
ProcVersionSignature: Ubuntu 3.10.0-4.13-generic 3.10.1
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-3.10.0-4-generic N/A
linux-backports-modules-3.10.0-4-generic N/A
linux-firmware 1.112
RfKill: Error: [Errno 2] No such file or directory
Tags: saucy
Uname: Linux 3.10.0-4-generic x86_64
UpgradeStatus: Upgraded to saucy on 2013-07-21 (2 days ago)
UserGroups:
dmi.bios.date: 09/20/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786F4 v01.46
dmi.board.name: 0A9Ch
dmi.board.vendor: Hewlett-Packard
dmi.board.version: NA
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr786F4v01.46:bd09/20/2012:svnHewlett-Packard:pnHPxw6600Workstation:pvr:rvnHewlett-Packard:rn0A9Ch:rvrNA:cvnHewlett-Packard:ct6:cvr:
dmi.product.name: HP xw6600 Workstation
dmi.sys.vendor: Hewlett-Packard
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.