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Subject: RE: [PATCH v2 0/2] transport-pci: Introduce legacy registers access using AQ
> From: Michael S. Tsirkin <mst@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.
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