[Bug 290997] [vmm]: Dedicated GPU - PCI passthrough not supported yet? (Variable size IVHD type 0xf0 not supported)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290997

--- Comment #12 from Nils Beyer <nbe@vkf-renzel.de> ---
(In reply to Corvin Köhne from comment #10)

okay, I've added that and bhyve actually runs now while the Intel GPU card is
passed through.

Unfortunately, within the VM the card does not function properly:
----------------------------- SNIP -----------------------------
[    0.000000] DMI: FreeBSD BHYVE/BHYVE, BIOS 14.0 10/17/2021
(...)
[    4.243973] xe 0000:00:06.0: [drm] Found BATTLEMAGE (device ID e20b) display
version 14.01 stepping B0
[    4.245823] xe 0000:00:06.0: [drm] Using GuC firmware from xe/bmg_guc_70.bin
version 70.40.2
[    4.250205] xe 0000:00:06.0: [drm] *ERROR* GT0: load failed: status =
0x40000056, time = 0ms, freq = 2150MHz (req 2133MHz), done = -1
[    4.250236] xe 0000:00:06.0: [drm] *ERROR* GT0: load failed: status: Reset =
0, BootROM = 0x2B, UKernel = 0x00, MIA = 0x00, Auth = 0x01
[    4.250257] xe 0000:00:06.0: [drm] *ERROR* GT0: firmware production part
check failure
[    4.250273] xe 0000:00:06.0: [drm] *ERROR* CRITICAL: Xe has declared device
0000:00:06.0 as wedged.
               IOCTLs and executions are blocked. Only a rebind may clear the
failure
               Please file a _new_ bug report at
https://gitlab.freedesktop.org/drm/xe/kernel/issues/new
[    4.312126] xe 0000:00:06.0: [drm] *ERROR* GT0: GuC mmio request 0x4100: no
reply 0x4100
[    4.312152] xe 0000:00:06.0: probe with driver xe failed with error -110
----------------------------- SNIP -----------------------------

I think that the failed mmio request has something to do with the missing BAR
resize function, correct?

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