It is not related to vendor-reset. It's the second function of the GPU: the audio device, which used the snd_hda_inte driver. You might want to bind that to vfio-pci (like you did for the audio device of the GT710). It should not be a problem, unless you use the audio of the GPU and experience problems with it.
Did you get vendor-reset working for the AMD GPU (VGA function)? Do you see output on a physical display connected to the RX570 from the Ubuntu VM?
Unfortunately, I am not getting a picture out of the GPU when I start Ubuntu - still black screen.
If I type
modprobe vendor-reset
I am not seeing anythingIf I type the following
cat /sys/bus/pci/devices/0000:02:00.0/reset_method
This is the output
device_specific
Can I bind 02:00 or should I only bind 02:00:1?