[vfio-users] [FEEDBACK NEEDED] Additionnal tips to include in the Arch wiki article

Nicolas Roy-Renaud nicolas.roy-renaud.1 at ens.etsmtl.ca
Fri May 20 17:38:10 UTC 2016


Did you have any issues with efifb or some other driver grabbing the 
gard before vfio-pci? What are your IOMMU groups like, which chard is 
your boot_vga, what script or method do you use to get vfio-pci to bind 
with your card, what's your kernel command line and what modules are 
included in your initramfs?

I've struggled with getting my primary GPU to work correctly for a 
passthrough like this, and I ended up switching it up with the secondary 
because I simply couldn't get it to work properly (I'd keep getting 
something about "|Invalid ROM contents|") and I couldn't see my boot 
logs until the host driver finished loading. It's really inconvenient 
now becuase my motherboard is designed so that having a full-size GPU in 
the second PCIe slot blocks 4 SATA ports out of 6, so I need to have 
L-shaped cables in a bunch of places to make everything work properly.

I'd really like to know what the solution to this problem is.

- Nicolas


On 2016-05-17 12:36, Zaki Saad wrote:
> Regarding
>> 3.) How to passthrough host primary GPU (if possible, :) )
> I've stuggled with that issue myself a lot until I gave up and ended 
> up switching my guest GPU to a secondary slot. I'm still not even sure 
> what counts as "host primary", is it the boot_vga?
>
>
> from https://www.redhat.com/archives/vfio-users/2016-May/msg00094.html,
>
> In my setup, my primary GPU is passed to a VM and my 'secondary' GPU 
> is used for the host.
>
> I use pci-stub to capture my primary GPU, and Xorg is given to my 
> secondary GPU through the use of BusID in xorg.conf.
>
> My primary GPU is AMD (r9 390), and my secondary (host) GPU is nVidia 
> (GT 730), running proprietary drivers.
>
> I am able to provide more details on this matter, if preferred.
>
>
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> vfio-users at redhat.com
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