On Tue, Jan 17, 2017 at 02:00:58PM +0100, Igor Mammedov wrote: > Question is how you'd get address of it and I think that's where > writable fwcfg files come in play. > I'd prefer fwcfg_loader in firmware to write it back after buffer > allocation is done as it's already has utilities for fw_cfg, > but that probably would mean extending loader protocol to support > new writeback command.
Right. It's quite easy to do as at least seabios was written to ignore commands it does not recognize. So with old bios you just don't get a write. Not sure about UEFI, worth checking. > PS, address one would get from guest should be migrated as well IIRC writeable fw cfg blobs are migrated automatically. -- MST
