> From: Jason Wang <jasowang@xxxxxxxxxx> > Sent: Tuesday, May 31, 2022 10:42 PM > > Well, the ability to query the virtqueue state was proposed as another > feature (Eugenio, please correct me). This should be sufficient for making > virtio-net to be live migrated. > The device is stopped, it won't answer to this special vq config done here. Programming all of these using cfg registers doesn't scale for on-chip memory and for the speed. Next would be to program hundreds of statistics of the 64 VQs through giant PCI config space register in some busy polling scheme. I can clearly see how all these are inefficient for faster LM. We need an efficient AQ to proceed with at minimum. > https://lists.oasis-open.org/archives/virtio-comment/202103/msg00008.html > > > Once the device is stopped, its state cannot be queried further as device > won't respond. > > It has limited use case. > > What we need is to stop non admin queue related portion of the device.
