On Mon, Mar 17, 2025 at 01:32:31PM +1100, Alexey Kardashevskiy wrote: > It is about accessing MMIO with Cbit set, and running DMA to/from private > memory, in DPDK. On AMD, if we want the PCI's Tbit in MMIO, the Cbit needs > to be set in some page table. "TVM" in this case is a few private pages (+ > bunch of PSP calls to bring to the right state) pretending to be a CVM which > does not need to run. Thanks, Yeah, though that may be infeasible on other platforms. I'm pretty sure ARM and Intel route the Tbit packets directly to their secure worlds so there is no possibility for VFIO to use them without also using the secure world to create a VM. Maybe AMD is different, IDK. Jason
