[vfio-users] GPU Passthrough, 2 GPUs to different virtual machines

[Sascha Fröhlich]

Hi,

I was pretty sure the card has EFI support because I had it running in a
different passthrough setup (Intel GPU and this GTX) and it worked.

Your advice and the comments from the folks at
https://www.reddit.com/r/VFIO/ got me in the right direction. The GTX was
tainted by the kernel because I was booting with CSM (AKA legacy boot)
enabled in the UEFI of the mainboard.

It took me three days to figure that out. Thanks to the community!

P. Pronk <vfio at pronk.nl> schrieb am So., 31. Dez. 2017, 14:05:

>
> Did you check if the 1060 has a rom with EFI support? See here:
> https://vfio.blogspot.com/2014/08/does-my-graphics-card-
> rom-support-efi.html
>
> If you have successfully downloaded the rom from the 1060 you could also
> specify that rom file in your qemu xml: https://libvirt.org/
> formatdomain.html#elementsHostDevSubsys
>
> On 31/12/17 13:31, Sascha Fröhlich wrote:
>
> I am loading the appropiate vfio modules at boot time before the nvidia
> module and I use efifb=off as kernel parameter. lspci -nnk states that the
> 2 cards are correctly claimed by vfio-pci.
>
> Additionally, I tried to use the driver_override approach mentioned in the
> blog post, but to no avail.
>
> 2017-12-31 13:21 GMT+01:00 Torbjorn Jansson <torbjorn.jansson at mbox200.
> swipnet.se>:
>
>> On 2017-12-31 12:25, Sascha Fröhlich wrote:
>>
>>> Hi,
>>>
>>> I am trying to get the following setup with a Xeon E5/ASUS X99-A II to
>>> work:
>>>
>>> First slot:      GTX 1060     -> VM 1
>>> Second slot: GTX 1070 -> VM 2
>>> Third slot:     GT 710         -> Host
>>>
>>> This is the latest ArchLinux. I had to use the propietary NVIDIA drivers
>>> and an additional Xorg configuration for the host GPU, because nouveau
>>> would flicker and crash. No need to blacklist anything.
>>>
>>> IOMMU and VFIO works fine though, lspci -nn -k reports the two GTX GPUs
>>> using vfio-pci:
>>> https://gist.github.com/anonymous/89ebd0e18464cef3c5dde6897c39eb5f
>>>
>>>
>> did you make sure that the proprietary nvidia driver is never
>> attached/loaded for the 2 cards you intend to forward to a vm?
>> see: http://vfio.blogspot.se/2015/05/vfio-gpu-how-to-series-
>> part-3-host.html
>>
>>
>
>
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