> From: Michael S. Tsirkin <m...@redhat.com> > Sent: Tuesday, May 23, 2023 2:39 AM
> but I would like us to better > document how and when does device switch to and from legacy mode, and for > the switch to be somehow reusable for solutions that are closer to vdpa. > To my knowledge vdpa do not have such switch, nor such switch in the spec, nor in the vdpa or PCI device. > Does enabling legacy commands cause the switch? Or should we add a > LEGACY_PCI command to enable/disable? I kind of like the second option ... Some devices may find it helpful to issue this command on the AQ, to say enable your legacy emulation and allocate needed resources. I guess before getting distracted on this side topic, lets close on the AQ or two register MMIO approach in other email thread.
