Bug#732378: linux-image-3.2.0-4-amd64: Msi regression with xen domUs using virtio devices

[Fabio Fantoni <fabio.fantoni@m2r.biz>]

2013/12/17 Ian Campbell <ijc@hellion.org.uk>

On Tue, 2013-12-17 at 13:40 +0100, Fabio Fantoni wrote:
> Package: src:linux
> Version: 3.2.51-1
> Severity: normal
>
> With Squeeze, virtio devices works correctly on xen pvhvm domUs.

If this was the case then I believe it was purely a coincidence. AFAIK
neither upstream nor Linux have ever considered this a workingand
supported configuration.

Please use the Xen PV devices under Xen pvhvm.

Ian.

http://wiki.xen.org/wiki/Virtio_On_Xen

Wei Lui had also added msi support for xen hvm domUs on qemu:
http://git.qemu.org/?p=qemu.git;a=commit;h=f1dbf015dfb0aa7f66f710a1f1bc58b662951de2

Virtio devices are correctly working on windows and old linux, I'll try to find the solution for newer linux too without using pci=nomsi.
With Konrad patch:
http://lists.xen.org/archives/html/xen-devel/2013-12/msg02639.html
will be possible use virtio net or block and xen pv for all other.
Other features using virtio, for example vdagent works also with xen pv driver active and have only this problem with newer linux that need a workaround for now.
Any help is appreciated.