nimble_bitz

Are any docker's using the GPU? I can't remember if the Epyc chips had integrated graphics. So if docker is using it you have to unmap that as it can't live in both worlds local to the kernel and as passthrough to a VM. If not verify passthrough in the tools> system devices and check the boxes next to the card and card audio. Reboot I think is required afterwards.
Word of warning, you may not get a display until you assign to the VM and turn the VM on. IOMMU passthrough without a secondary GPU can be "weird" for lack of better words.

Got it had to remove the /dev/ then it worked. Any idea how to fix the issue with the /dev/mapping/sdb1 actually being /dev/sdb ? I can make a new topic if needed, but your help is much appreciated!