Understanding NVME Patch for nvidia-fs support for GDS ( non p2pdma mode)

@kmodukuri i am trying to understand the patches required for NVIDIA-FS support for GDS,
is the changes under
New Files
host/nvfs-dma.c
host/nvfs-dma.h
host/nvfs.h

Patches
host/pci.c(patched)

Also changes under CONFIG_NVFS is enough?