Hi!
Can you check your BIOS configuration?
VMware IOMMU function derived from Intel VT-d configuration.
If you check all X8DTT BIOS configuration about Intel VT-d.
ConnectX VPI also has a problem with Intel VT-d functions.
MNEH28-XTC is a ConnectX families.
I'm not a Mellanox Ethernet products but I guess that has a same architecture.
Good luck...