Intel ARC 310 Problem

chicagomed

New XCP-NG user so please forgive any obvious mistakes.

Two issues:

I have an Arc 310 on XCP-NG 8.3 I am trying to pass it through to a VM
but only the HDMI component is visible in PCIE-LIST or on XOA GUI.
I am able to pass that through.

I can see the Audio component in the system from Console but I can't get it
to show up in the XE commands/environment.
When passing throught the HDMI component to my VM (Arch Linux, up to date build)
I seem to be having a contention problem with the XCP-NG Cirrus driver. I have tried blacklisting
it/disabling it but without any luck. Wondering if anyone is having this problem (using Arch/Hyprland).

Thank you and looking forward to contributing to this community.

olivierlambert

Can you do a lspci in the Dom0? I'm not sure the audio device is an adressable device (unlike Nvidia cards for example)

chicagomed

Enchanté @olivierlambert!

Thank you for the reply and this great product. I've followed you for a few years! A pleasure to be writing with you.

Here is the screenshot of the host. 0b appears both with XE and on the GUI.
0a (the audio) never makes it past the Dom0. I've read about various conditions where the Dom0 could hijack it but I haven't been successful in my trouble shooting.

Best Regards!

olivierlambert

Hmm are you sure it's correctly ignored before trying to pass it trough? The success of PCI passthrough is only possible because it's hidden from the Dom0

chicagomed

@olivierlambert

I added this to: boot/efi/EFI/xenserver/grub.cfg

xen-pciback.hide=(09:00.0)(09:00.1)

On reboot I get with lspci:

0a:00.0 Audio device: Intel Corporation DG2 Audio Controller
0b:00.0 VGA compatible controller: Intel Corporation DG2 [Arc A310] (rev 05)

But with xl pci-assignable-list I get:

0000:01:00.6
0000:01:00.4
0000:0b:00.0
0000:01:00.0
0000:01:00.3

Note the 0a device is missing.

I am about to throw out this 310 at this stage because I'm having equally frustrating problems with the cards once they are in the VM (I cannot get Wayland or X10 to stop trying to grab Cirrus first).

I'm reading that this is common for Arc GPUs, but was really hoping this would be a lot more plug and play.

Any other thoughts/tests would be appreciated as I hate just giving up on such challenges!

chicagomed

Correction (sorry it won't let me edit for some reason). I added

xen-pciback.hide=(00.0b.0)(00.0a.0)

olivierlambert

Have you checked all the pre requisites at https://docs.xcp-ng.org/compute/#-pci-passthrough?

Also be sure to use the complete PCIe address, like:

/opt/xensource/libexec/xen-cmdline --set-dom0 "xen-pciback.hide=(0000:04:01.0)(0000:00:19.0)"