Public bug reported:
Trying to allocate a hardware device (telecoms card) using virt-manager results
in errors - most frequently (but not exclusively)
a) Errors claiming IOMMU cannot be found even though the hardware is VT-x and
VT-d capable and BIOS has it enabled
b) Failed to assign irq for "hostdev0": Operation not permitted
Perhaps you are assigning a device that shares an IRQ with another device?
and
c) PCI region 0 at address 0xe5200000 has size 0x100, which is not a multiple
of 4K
Tried with versions of Lucid and Maverick. Currently using
0.8.3-1ubuntu9
Investigation showed that
i) The kernel does not have DMAR enabled even on Maverick Server.
ii) apparmor profile does not have the right settings
iii) Updates in qemu-kvm git repository which handle small I/O windows havent
yet been incorporated in a release
Investigation showed there to be several problems (which perhaps could gave
been documented somewhere)
To fix this successfully it was necessary for me to undertake the following:
a) recompiled the kernel with
CONFIG_DMAR=y
CONFIG_DMAR_DEFAULT_ON=y
CONFIG_GART_IOMMU=y
b) recompiled qemu-kvm from git source
c) Added the following to /etc/apparmor.d/abstractions/libvirt-qemu
# required for pci passthru
capability sys_rawio,
# For hostdev access.
/sys/devices/ r,
/sys/devices/** r,
You could argue that the small PCI Memory problem was very card specific
but given that Ubuntu claims the Server version is ready for
virtualisation under KVM and that technology supports VT-d and PCI Pass
Through there should be a suitable kernel version and apparmor profile
that supports it available.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: libvirt-bin 0.8.3-1ubuntu9 [modified: usr/bin/virsh usr/sbin/libvirtd
usr/share/libvirt/schemas/domain.rng usr/share/libvirt/schemas/storagepool.rng]
ProcVersionSignature: Ubuntu 2.6.35-19.28-dmar 2.6.35.3
Uname: Linux 2.6.35-19-dmar x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Wed Sep 15 16:49:55 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100803.1)
ProcEnviron:
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: libvirt
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug maverick
--
PCI Pass Through via libvirt cannot remap IRQ's
https://bugs.launchpad.net/bugs/639712
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