Comment by IcePic
3 days ago
Then again, remote DMA to your memory via a port on the computer, while a great tool for debugging internal stuff, is also quite the wide door to getting hacked if someone every manages to plug in a malicious device in the same port.
It's funny how we've come back around to this, with the M3 Mac Studios allowing you to enable RDMA over Thunderbolt. You have to toggle the setting via a firmware change, but it's there for performance!
FireWire was pretty wild in its day. It just got hampered by the per-port licensing fee, and once USB 2.0 rolled out, its days were numbered for anyone not needing the latency/power features.
IOMMU solved this issue with virtual memory mapping for MIMO hardware.