I'd only expect code sharing to be worthwhile if the interface between the NVMe driver and the rest of the OS's storage stack is quite similar. NVMe over PCIe i

I'd only expect code sharing to be worthwhile if the interface between the NVMe driver and the rest of the OS's storage stack is quite similar. NVMe over PCIe is pretty simple, so there's not much logic that would be wholly contained within the driver itself.