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