I'm looking into direct communication between a Mac and a Linux machine connected over Thunderbolt. Thunderbolt networking works fine, but I'd like to explore whether it's possible to transfer data using native Thunderbolt DMA, without going through the TCP/IP stack. I've looked through the IOKit and DriverKit documentation, but most of what I've found relates to drivers for PCIe devices connected over Thunderbolt rather than communication between two hosts. A couple of questions: Is there a supported API for discovering Thunderbolt XDomain services and establishing native DMA-backed send/receive paths between hosts? Can this be done from userspace or DriverKit, or would it require a kernel extension? Ideally, I'd also like to keep the existing Thunderbolt networking interface working alongside it. Any pointers to relevant APIs or documentation would be appreciated. Thanks!