On Tue, Aug 14, 2018 at 06:35:16PM -0700, Michal Wnukowski wrote: > > The other side in this case is not actual controller hardware, but > virtual one (the regular hardware should rely on normal MMIO > doorbells).
There could very much be real hardware there. We've made it clear in the spec that while a typical use case is a virtualized controller there is nothing peventing hardware implementations. There have been previous hardware prototypes to use very similar tricks, e.g.: https://www.usenix.org/node/179878
