Re: PCI-passthrough on AMD - OpenVox A400P

[Alex Williamson <alex.williamson@redhat.com>]

On Tue, 2013-04-09 at 14:58 -0300, Daniel Bareiro wrote:
> Hi all!
> 
> 
> I've a cluster (active/passive) with two KVM VM with Asterisk and 
> Pacemaker+Corosync. I wonder if anyone tried to use a OpenVox A400P 
> card from a virtual machine.
> 
> My idea is to have both nodes accessing this card. I don't know if it is
> possible, I wish that in this scenario when a node is accessing the
> card, the other don't use it.
> 
> Of course this is a scenario for testing, but I wonder if I can do
> this kind of configuration on the cluster over virtual machines.
> 
> Hardware:
> Motherboard: ASUS M2N32-SLI DELUXE ACPI BIOS Revision 0706
> Processor:   AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
> 
> The hardware seems to support IOMMU, but it is not enabled:
> 
> # dmesg | grep -i iommu
> [    0.000000] Please enable the IOMMU option in the BIOS setup
> [    0.654618] PCI-DMA: using GART IOMMU.
> [    0.654623] PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture
> 
> 
> Software versions:
> 
> # uname -a
> Linux ss01 2.6.39-bpo.2-amd64 #1 SMP Thu Aug 4 11:42:06 UTC 2011 x86_64 GNU/Linux
> 
> # kvm --version
> QEMU emulator version 1.1.2 (qemu-kvm-1.1.2+dfsg-5~bpo60+1, Debian), Copyright (c) 2003-2008 Fabrice Bellard
> 
> 
> 
> 
> Thanks in advance for your reply.

AFAIK, Athlon64 does not support AMD-Vi, which is the IOMMU support
you'd need.  PCI passthrough also only works for VMs running on the same
system where the card is installed, and doesn't offer multiplexing of a
single device.  Thanks,

Alex