@tuxen
That's very bizarre..
I don't have any spare servers for testing at the moment.
I do have a NVMe drive plugged into one of the PCIe slots, could that be causing an issue?

lspci -k.txt dmesg.txt

@tuxen I've attached both outputs, they're quite long actually.
I can also confirm SR-IOV is definitely enabled in the bios (double checked).

I'm not too sure what you mean steps 2 & 3.

Recently installed a pair of Radeon S7150's (single slot) gpu's in a couple of HPE DL360 G9 servers.

The cards showed up as passthrough capable in XCP-NG Center,
I then installed the host drivers (mxgpu-2.0.0.amd),
rebooted,
MxGPU (AMD vGPU) was now enabled.

I assign a vGPU to a Windows VM and when i tried to start the VM I got the below error in XCP-NG

"Internal Error: No free virtual function found"
Xen orchestra also produced the same error...

I attempted the solution outlined in this thread, https://xcp-ng.org/forum/topic/3404/firepro-s7150x2-sr-iov-errors
and after a reboot I was never greeted to the xcp-ng server screen and the server no longer connected to the network.
I had to reboot go through the list of options in the grub boot screen until I managed to get one that booted back into XCP-NG, vGPU still does not work.

send help