Re: bhyve/passthru for Intel dGPU (ARC A380)?

Thanks for the feedback Corvin, and thank you for the hard work you've been
putting into GPU passthru.

I'm reaching the end of my limited knowledge here, and I have no
expectation of any further assistance - but as a status update, BIOS in CSM
(with legacy video op rom, so I see the console).

If you want to pass the option rom to the guest, you can use the rom option
> of
> passthru devices:
>
> -s 1/2/3,passthru,1/2/3,rom=/path/to/rom


I extracted the option ROM using linux, I was able to use the
/sys/devices/pci*/rom route to extract it, it seems valid at a glance (768k
dump) - but no idea how to really tell.

Using the patched bhyve executable to bypass gvt-d: -s
4/0/0,passthru,4/0/0,rom=/mnt/vm/intel-arc-a380.bin -s 5/0/0,passthru,5/0/0
(5/0/0 is a separate audio device exposing the audio channels of the HDMI
ports).

Sadly initialization of the GPU in the linux (Ubuntu 24.04 / linux 6.8.0)
VM still fails:
[    2.508656] i915 0000:00:04.0: enabling device (0000 -> 0002)
[    2.520226] i915 0000:00:04.0: [drm] Local memory IO size:
0x000000017c800000
[    2.520232] i915 0000:00:04.0: [drm] Local memory available:
0x000000017c800000
[    2.540148] i915 0000:00:04.0: vgaarb: VGA decodes changed:
olddecodes=io+mem,decodes=none:owns=none
[    2.550829] i915 0000:00:04.0: [drm] Finished loading DMC firmware
i915/dg2_dmc_ver2_08.bin (v2.8)
[    2.564885] i915 0000:00:04.0: [drm] GT0: GUC: ADS capture alloc size
changed from 32768 to 36864
[    2.565855] i915 0000:00:04.0: [drm] GT0: GuC firmware
i915/dg2_guc_70.bin version 70.20.0
[    2.565859] i915 0000:00:04.0: [drm] GT0: HuC firmware
i915/dg2_huc_gsc.bin version 7.10.3
[    2.565979] i915 0000:00:04.0: [drm] GT0: GUC: ADS capture alloc size
changed from 32768 to 36864
[    2.567001] i915 0000:00:04.0: [drm] GT0: GUC: load failed: status =
0x40000056, time = 0ms, freq = 2300MHz, ret = 0
[    2.567006] i915 0000:00:04.0: [drm] GT0: GUC: load failed: status:
Reset = 0, BootROM = 0x2B, UKernel = 0x00, MIA = 0x00, Auth = 0x01
[    2.567009] i915 0000:00:04.0: [drm] GT0: GUC: firmware production part
check failure
[    2.567077] i915 0000:00:04.0: [drm] *ERROR* GT0: GuC initialization
failed -ENOEXEC
[    2.567610] i915 0000:00:04.0: [drm] *ERROR* GT0: Enabling uc failed (-5)
[    2.567949] i915 0000:00:04.0: [drm] *ERROR* GT0: Failed to initialize
GPU, declaring it wedged!
[    2.570106] i915 0000:00:04.0: [drm:add_taint_for_CI [i915]] CI
tainted:0x9 by intel_gt_set_wedged_on_init+0x34/0x50 [i915]
[    2.587048] [drm] Initialized i915 1.6.0 20230929 for 0000:00:04.0 on
minor 1

Interestingly intel_gpu_top will interact with the card to a degree, it
shows a render utilization (of 0%), but none of the other card
capabilities. There are some very similar errors in Google which may
suggest it's may not be a bhyve/passthru issue, though it could be. I need
to spin up a new VM with more bleeding edge linux (or maybe even Win11) to
see if it can talk to the card.

https://github.com/intel-analytics/ipex-llm/issues/12122

I'll post if I get any further, but I suspect this is the end for now.

Peter.
-- 
*Peter Wood*
peter@alastria.net