[vfio-users] Intel 520 Integrated Graphics Card Passthrough Issues

[Jeff Tchang]

Posted this on a Proxmox forum as well but wanted to see if anyone had any
ideas on getting an Intel 520 integrated GPU (Skylake) working. For
reference these are NUC 6i3.

The issue I am seeing is that upon starting the VM with PCI passthrough
enabled the screen blanks and just goes dark.

I am seeing dmesg lines:

[  202.990645] DMAR: DRHD: handling fault status reg 2

[  202.990662] DMAR: [DMA Write] Request device [00:02.0] PASID ffffffff
fault addr 0 [fault reason 02] Present bit in context entry is clear

[  203.384895] vfio-pci 0000:00:02.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem


More details available here:
https://gist.github.com/tachang/66d0db979aa6d9149a5a284e15b9bd74

I've seen one older thread which seems to apply to my situation.
https://www.redhat.com/archives/vfio-users/2018-May/msg00008.html

To continue I don't see anything useful in the libvirt domain log (
https://gist.github.com/tachang/f5d6b10e8e1e7f7ac2a5bb1180f6c096)

-Jeff
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