Direct firmware load failed with error -2 and mdev_supported_types missing (Coffee Lake)

[ChristophSchmidpeter]

I have built the gvt-staging, but after booting with required kernel parameters (see below) mdev_supported_types does not appear. Dmesg prints the error (see also DmesgGvtStaging.txt):

i915 0000:00:02.0: Direct firmware load for i915/gvt/vid_0x8086_did_0x3e9b_rid_0x00.golden_hw_state failed with error -2

System: Arch Linux
CPU: Coffee Lake (i7-8750H)
GPU: Optimus (UHD Graphics 630 + Quadro P600)
Driver: bumblebee 3.2.1-20 xf86-video-intel 1:2.99.917+860+g3a2dec17-1 nvidia-dkms 418.43-4
Branch: gvt-staging (built 03.03.19)
Kernel Parameters for dmesg: i915.enable_gvt=1 kvm.ignore_msrs=1 intel_iommu=on ignore_loglevel drm.debug=2 "dyndbg=file gvt +p"

[CuriousTommy]

@albionxy I am glad I am not the only one with this issue. I am having a similar problem on my Fedora machine (Dell Precision 5510). When I try the latest gvt-linux kernel, the mdev_supported_types directory does not appear.

However, if I use the official Fedora Kernel, I can create the mdev device, but the iommu_group directory does not exist.

Edit: You can find my bug report here: #74

[ChristophSchmidpeter]

@CuriousTommy: Thank you for your info! Good to know that it is not just some misconfiguration on my system or something.

I can reproduce the issue also with gvt-staging-2019y-01m-10d-11h-40m-01s, which is mentioned to work for Coffee Lake in #14 (always reproducible).
Did anybody get it to work with Coffee Lake (especially on a notebook) for gvt-staging-2019y-01m-10d-11h-40m-01s or newer?

[CuriousTommy]

This might be a long shot, but maybe the vfio_mdev module is not loaded on your system. Once I loaded it on my machine, I was able to get it working again!

[TerrenceXu]

The error your met is not a bug and it will not occurs mdev_supported_types load failed.
@albionxy The first tag support Coffee Lake platform should be "gvt-staging-2019y-02m-22d-16h-20m-42s", you can use a newer tag for a try.

[ChristophSchmidpeter]

@CuriousTommy Thank you, your hint was spot on! Adding kvmgt vfio-iommu-type1 vfio-mdev to MODULES=(...) in /etc/mkinitcpio.conf did the trick for me. I guess I've read the respective part in the tutorial over, as this used to be not required, as far as I understand.

[ChristophSchmidpeter]

@TerrenceXu: Thank you for the hint. I can boot the gvt-staging (3.3.19) kernel with Windows 10 now. However, a popup saying 'This installation package is not supported by this processor type' shows up when I try to install the Intel installer (tried 25.20.100.6577 and 25.20.100.6519) and 'Error 31' remains. Strangely it says 'Microsoft Basic Display Adapter' instead of 'Intel UHD Graphics 630', which I would have expected to say even before installing the driver. (qemu script I used: TestGvt.txt)
What am I missing, or which driver do I need for Windows 10 x64 with Coffee Lake?

[TerrenceXu]

@albionxy You can try to modify "-vga qxl" to "-vga none", since DMA-BUF not support multi monitor display .

[ChristophSchmidpeter]

@TerrenceXu: For some reason I can now install the driver, even with "-vga qxl". Not sure why.
So the mdev_supported_types appears now.

However, the

i915 0000:00:02.0: Direct firmware load for i915/gvt/vid_0x8086_did_0x3e9b_rid_0x00.golden_hw_state failed with error -2

error message remains. Either it indicates a real issue, or it is wrong and should be removed (or changed from error to info, or something). But in either case, I think it is a bug.

[TerrenceXu]

@albionxy , it is not a real issue, and we will remove or change from erro to info, thank you for your reminder!

[joyqing]

The error your met is not a bug and it will not occurs mdev_supported_types load failed.
@albionxy The first tag support Coffee Lake platform should be "gvt-staging-2019y-02m-22d-16h-20m-42s", you can use a newer tag for a try.

hello Mr Xu, could you please tell me how to use the tag to try. I'm a newbie of IGPU passthrough. I'd like to pass through my i7-8700k UHD630 to VM MacOS. My system is below:
Linux version 5.0.18-1-MANJARO (builduser@development) (gcc version 8.3.0 (GCC)) #1 SMP PREEMPT Wed May 22 17:35:29 UTC 2019
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.0-x86_64 root=UUID=427750eb-168c-4724-af59-14436953be7d rw iommu=pt intel_iommu=on quiet iommu=pt intel_iommu=on i915.enable_gvt=1 default_hugepagesz=1G hugepagesz=1G hugepages=32
kvm_intel 311296 0
kvmgt 32768 0
mdev 24576 2 kvmgt,vfio_mdev
kvm 745472 2 kvmgt,kvm_intel
irqbypass 16384 2 vfio_pci,kvm
vfio 36864 4 kvmgt,vfio_mdev,vfio_iommu_type1,vfio_pci

I created a VM, passed through AMD rx580 and installed MacOS 10.15. It works fine. Now I want to add UHD630 to the VM but I can't find the folder "mdev_supported_types". Could you please give me some links for newbie to learn? Thank you very much.

Aaron

[ChristophSchmidpeter]

@TerrenceXu
The error message still appears with linux-5.4.7. Could you please remove/fix the error message, because the error message might confuse people.

[TerrenceXu]

You can run "modprobe kvmgt" in your host and try again. :)