[vfio-users] IGD passthrough on UEFI platforms

[Daimon Wang]

I'm also interested in the answer.I've read about how to use BIOS GPU in UEFI system, but not versa.
For your first question, since most Mac have 2 GPU, I'll probably give the "unused" (slow) IGD to (slow) vm, while display the vm output onto the main screen (GPU). Thus UPD mode should be fine.
Regards,Daimon 

    On Wednesday, January 3, 2018 4:10 PM, Dmitry Fleytman <dmitry.fleytman at gmail.com> wrote:
 

 Hello All,

We're evaluating possibility of using IGD passthrough in legacy mode using Apple laptops, like Macbook Air as a h/w platform.

Apple laptops are using UEFI boot, according to lspci the options rom is disabled:
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]

As a result when trying to launch QEMU IGD passthrough, the following error is encountered:
qemu-system-x86_64: -device vfio-pci,host=00:02.0,id=hostdev0,bus=pci.0,addr=0x2: IGD device 0000:00:02.0 has no ROM, legacy mode disabled

We tried to supply VBIOS binaries dumped from another platform with the same graphics adaptor, but that did not work either:  “legacy mode disabled” error disappeared but the picture did not show up on the screen.

Therefore, we would like to ask a number of questions:

  - What in your opinion would be the best way to make IGD passthrough working on hardware like this?
  - For UEFI only OSes, like MacOS, what are the missing parts required to support UEFI VM with IGD passthrough?

Your thoughts are welcome,
Dmitry


_______________________________________________
vfio-users mailing list
vfio-users at redhat.com
https://www.redhat.com/mailman/listinfo/vfio-users


   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/vfio-users/attachments/20180103/c97dbbc8/attachment.htm>