On Fri, Oct 30, 2020 at 11:13:59AM +0000, Stefan Hajnoczi wrote: > > > 3. The device can save/load opaque blobs. This is the initial VFIO > > > approach. > > > > > > I still don't get why it must be opaque. > > If the device state format needs to be in the VMM then each device > needs explicit enablement in each VMM (QEMU, cloud-hypervisor, etc).
And QEMU cares why exactly? > Let's invert the question: why does the VMM need to understand the > device state of a _passthrough_ device? To support cross version migration and compatibility checks. This problem is harder than it appears, I don't think vendors will do a good job of it without any guidance and standards. -- MST
