[vfio-users] vfio PCI passthrough NVIDIA K420 GPU problems

[Alex Williamson]

On Wed, Feb 24, 2016 at 1:26 PM, Bronek Kozicki <brok at spamcop.net> wrote:

> On 24/02/2016 15:41, Daniel Pocock wrote:
>
>>
>>
>> Hi,
>>
>> I'm trying to use PCI passthrough to give an NVIDIA GPU to a VM with
>> qemu / KVM.  I've summarized my environment below and the error I get is
>> near the bottom.  Any help would be appreciated.
>>
>> There are a few guides I've been referring to already:
>> https://wiki.debian.org/VGAPassthrough
>>
>> https://www.pugetsystems.com/labs/articles/Multiheaded-NVIDIA-Gaming-using-Ubuntu-14-04-KVM-585/
>> https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF
>> https://bbs.archlinux.org/viewtopic.php?id=162768
>> http://www.linux-kvm.org/page/VGA_device_assignment
>>
>
>
> Hi Daniel
>
>
> I'm successfully passing through two Quadro M5000 (to two instances of
> Windows 10), looking at
> http://us.download.nvidia.com/Windows/Quadro_Certified/361.91/361.91-win10-quadro-grid-release-notes.pdf
> (page 9) it is not obvious that this would work for either your K420 or
> mine M5000. One gotcha - when starting Windows I do not see boot screen at
> all, only Windows logon scren after nVidia drivers had loaded. Explanation
> is in Alex's email sent to this list on 6th Feb 2016, subject "No boot
> screen on Quadro M5000?" - basically passed through Quadro cards are meant
> to be secondary  only (I use them as only card, though). However this small
> quirk aside, this works for me very well.
>


Unfortunately K420 falls into the gap of unsupported and unknown between
GeForce, which are clearly unsupported, but we know how to make them work,
and Quardo K2000+, which are supported.  Typically Quadro cards don't work
as primary like GeForce do, and the NVIDIA driver will pull a Code 43 on
them, so it probably requires some combination of secondary plus hiding KVM
& Hyper-v (or changing hyper-v vendor info) to make it work.  I'll note
though that K420 is a GK107GL, as is the K2000, so x-pci-device-id might be
an interesting experiment.  And of course, the most important guide was
missed from the list, the one at vfio.blogspot.com ;)  Thanks,

Alex
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