On Thu, Dec 07, 2017 at 08:45:33AM -0800, Alexander Duyck wrote: > As far as indicating that the interfaces are meant to be enslaved I > wonder if we couldn't look at tweaking the PCI layout of the guest and > use that to indicate that a given set of interfaces are meant to be > bonded. For example the VFs are all meant to work as a part of a > multi-function device. What if we were to make virtio-net function 0 > of a PCI/PCIe device, and then place any direct assigned VFs that are > meant to be a part of the bond in functions 1-7 of the device? Then it > isn't too far off from the model we have on the host where if the VF > goes away we would expect to see the traffic on the PF that is usually > occupying function 0 of a given device.
This pretty much precludes removing them with hotplug. But as long as we are happy to limit this to pci devices, maybe we should put them behind a pci bridge. All devices behind a bridge would be assumed to have the same backend. QEMU has pci-bridge-seat which we could reuse for this - just need to build a similar pci express bridge. -- MST
