Intel Core Ultra iGPU passthrough

TeddyAstie

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

antest

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

yannsionneau

@antest Hi

I notice in your domU dmesg:

[    2.425816] i915 0000:00:08.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0x4556
[    2.425820] i915 0000:00:08.0: [drm] Failed to find VBIOS tables (VBT)

If you are on a non-production machine can you give this a try?
=> https://xcp-ng.org/forum/topic/12523/igpu-pci-passthrough-new-experimental-packages-need-testers

Thanks!
Yann

antest

@yannsionneau Hi,

I really appreciate the effort, but unfortunately I had to migrate to another hypervisor on this server and it's already away and running.

However, when I get a new one I will make sure to test this and report back.

Thanks anyway.