I am running unraid 6.6.2 and tried to pass through an ADATA XPG SX8200 with Silicon Motion SM2262 controller. Appears to be same issue:
vfio error: 0000:0b:00.0: failed to add PCI capability 0x11[0x50]@0xb0: table & pba overlap, or they don't fit in BARs, or don't align
My system is an Asus X99-WS and i7 5960X. Anyone have any ideas?