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

[Eddie Yen]

IME, K420 still had some issues need to approach.
I could't make it work when insert in DELL R720 Server, but it worked when
insert in my X79 platform.
And the settings between two platforms are similar, only the differences I
remember was OS (Ubuntu Server vs. Ubuntu Desktop).
But it's a past story.

Besides, as secondary card, sometimes will cause BSOD during driver
installation, even AMD.
Yesterday I tried to install my V4800 again and it got BSOD during
installation. And I solved this problem by switch to OVMF.
Before that, I used to install GTX980 driver as secondary card, and it got
BSOD after installation, stuck at Windows reboot.

2016-02-25 6:18 GMT+08:00 Alex Williamson <alex.l.williamson at gmail.com>:

> On Wed, Feb 24, 2016 at 2:45 PM, Daniel Pocock <daniel at pocock.pro> wrote:
>
>>
>>
>> On 24/02/16 21:58, Alex Williamson wrote:
>> >
>> >
>> > On Wed, Feb 24, 2016 at 1:26 PM, Bronek Kozicki <brok at spamcop.net
>> > <mailto: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 <http://vfio.blogspot.com> ;)  Thanks,
>> >
>>
>>
>> Thanks for all the replies about this
>>
>> What do you mean by primary vs secondary, is that documented somewhere?
>>  Do you mean I need some other card to be primary in the VM?
>>
>> I have two cards I can use for this VM, the K420 and a Quadro 2000.
>>
>> The Quadro 2000 is mentioned favorably in the Xen guide[1], am I likely
>> to have more luck with that than the K420?  The Quadro 2000 is a HP card
>> and HP provides a BIOS download[2] too.
>>
>
> In a secondary configuration, an emulated graphics is the primary graphics
> and is used for pre-boot, early boot, and install for the VM.  Once
> accelerated drivers are installed and enabled, the primary graphics is
> generally disabled (automatically or manually depending on the guest OS).
> In a primary graphics configuration, the assigned GPU is the primary,
> typically exclusive, graphics for the VM.  The 2000 is probably more likely
> to work because NVIDIA is potentially not explicitly preventing it from
> working like they do for the K420 and GeForce cards.   It is a Fermi based
> card though, so it's not something we would actually claim as supported by
> NVIDIA.  Add it to the VM just as you would any other PCI assigned device,
> keeping the emulated graphics configuration.  Thanks,
>
> Alex
>
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