I'm trying with 12.04 LTS KVM host and guest.
RHEL 6 documentation says: {{ Secure device assignment also requires
interrupt remapping support. If a platform does not support interrupt
remapping, device assignment will fail. To use device assignment without
interrupt remapping support in a development environment, set the
allow_unsafe_assigned_interrupts KVM module parameter to 1. }}
and I get in dmesg:
[ 5556.500176] kvm_iommu_map_guest: No interrupt remapping support,
disallowing device assignment. Re-enble with
"allow_unsafe_assigned_interrupts=1" module option.
Easy to create
/etc/modprobe.d/kvm.conf containing
options kvm allow_unsafe_assigned_interrupts=1
However, there is CVE-2011-1898 which this makes your system vulnerable
to see:
https://bugzilla.redhat.com/show_bug.cgi?id=715555
** Bug watch added: Red Hat Bugzilla #715555
https://bugzilla.redhat.com/show_bug.cgi?id=715555
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2011-1898
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https://bugs.launchpad.net/bugs/639712
Title:
PCI Pass Through via libvirt cannot remap IRQ's
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