Fatal PCIe error 928 on KVM GPU Passthrough

[Mario Ceresa]

Dear all,
does anybody know if it is currently possible to do GPU passthrough in kvm?
I have access to a dual Quadro 4000 setup and I would like to pass the
second one to kvm for use in a VM.

I read a lot on internet and it seems feasible [1, 2, 3] and there is even
a reported success case [5].

However when I start the VM the host reboots with PCIe error 928:
Completion timeout.

My current setup is:

* Fedora 18 with 3.9.4-200 x86_64
* dmesg | grep -e DMAR -e IOMMU shows that they are both enabled
* nvidia driver installed from rpmfusion
* I use vfio assignment as per [4]

Thanks and regards,

Mario


[1] http://www.linux-kvm.org/page/VGA_device_assignment
[2] https://bbs.archlinux.org/viewtopic.php?id=162768
[3]
http://samos-it.com/removedetach-a-pci-device-linux-kvm-vga-passthrgough-nvidia-quadro-2000/
[4]
https://fedoraproject.org/wiki/QA:Testcase_Virtualization_KVM_PCI_Device_Assignment
[5]
http://tavi-tech.blogspot.com.es/2012/05/vga-passthrough-kvm-fedora-17-and.html
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