Intel Core Ultra iGPU passthrough

antest

Hi everybody,

First of all I would like to thank all the contributors for the hard effort put into building and maintaining this project and for the vast amount of support that this forum has been giving!

Specs:
DELL Tower
CPU: Intel Core Ultra 5 235
XCP-ng 8.3

I have been trying to passthrough the iGPU to a VM running Debian 13 but keep getting errors.
I have successfully passed older intel iGPUs and have always worked perfectly.

PCI pass through enabled:

I don't know if this is normal but if I attach the GPU using xcp-ng center it shows up in XOA:

But not as a pci device:

Regardless, I have also attached as pci:
Halted VM:

Running VM:

Upon boot console gets filled:

[   24.283971] i915 0000:00:08.0: [drm] *ERROR* GT1: GSC proxy component didn't bind within the expected timeout
[   24.283993] i915 0000:00:08.0: [drm] *ERROR* GT1: GSC proxy handler failed to init
[   48.271474] i915 0000:00:08.0: [drm] *ERROR* GT0: GUC: TLB invalidation response timed out for seqno 60
[   50.282144] i915 0000:00:08.0: [drm] *ERROR* GT0: GUC: TLB invalidation response timed out for seqno 61
[   52.294046] i915 0000:00:08.0: [drm] *ERROR* GT1: GUC: TLB invalidation response timed out for seqno 41
[   54.306843] i915 0000:00:08.0: [drm] *ERROR* GT1: GUC: TLB invalidation response timed out for seqno 42

lspci detects the gpu, but it's not usable.

Also tried changing to XE drivers instead of i915 and didn't help.

Because I don't know enough to diagnose this, I tried asking AI which prompted me to perform "xen-pciback.hide" for the Intel Management Engine (ME) and still didn't help.
Also tried with Ubuntu 25.10.

Has anyone been able to pass through a similar iGPU?

Sorry for the image spamming.

Thank you.

olivierlambert

I'm not sure Intel iGPU passthrough can work. Let me ping @teddyastie maybe

TeddyAstie

Do you get anything special written to xl dmesg in Dom0 ?

antest

@TeddyAstie

I don't think so, it seems IOMMU is enabled:

(XEN) [ 0.183949] Intel VT-d iommu 0 supported page sizes: 4kB, 2MB, 1GB
(XEN) [ 0.191524] I/O virtualisation enabled

I'll leave the full log attached.

xl_dmesg.txt

TeddyAstie

@antest can you retry after doing /opt/xensource/libexec/xen-cmdline --set-xen iommu=debug then rebooting.
And also reporting full DomU and Dom0 dmesg (in addition to xl dmesg) ?

antest

@TeddyAstie

After rebooting, with pci attached:

xl_dmesg.txt
Dom0_dmesg.txt
Dom1_dmesg.txt

ovicz

Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.12.57+deb13-amd64 root=UUID=d706ed91-c2dd-4c8f-92cb-d2a595e24fe4 ro quiet splash i915.force_probe=7d67 i915.enable_guc=3 i915.max_vfs=7

Try to remove the i915 options and rebuild grub then reboot. see if that errors regarding guc pops up again,

I don't see in modinfo i915 that value of enable_guc=3

parm: enable_guc:Enable GuC load for GuC submission and/or HuC load. Required functionality can be selected using bitmask values. (-1=auto [default], 0=disable, 1=GuC submission, 2=HuC load) (int)

antest

@ovicz Tried it, didn't change.

But thanks anyway.

TeddyAstie

@antest can you try running the VM with only 1 vCPU ?

antest

@TeddyAstie Sure thing:

xl_dmesg.txt
Dom0_dmesg.txt
DomU_dmesg.txt