On Tue, Feb 23, 2016 at 08:07:17AM +0100, Gerd Hoffmann wrote: > On Mo, 2016-02-22 at 22:12 +0200, Michael S. Tsirkin wrote: > > On Mon, Feb 22, 2016 at 03:26:56PM +0100, Gerd Hoffmann wrote: > > > On Mo, 2016-02-22 at 14:41 +0200, Michael S. Tsirkin wrote: > > > > Useful to send guest data back to QEMU. > > > > > > Use case? > > > > > > cheers, > > > Gerd > > > > VM GEN ID at least wants to pass address of some blob > > in guest memory to host. > > > > Apparently, that's also useful for nvdimm. > > > > A reasonable way to do that seems to be to write it into > > fw cfg file, this way it's also migrated automatically. > > Both seem to be about acpi aml code talking to qemu backend.
At least not for gen id - there will be a linker patch to initialize that. > Not sure fw_cfg files are reasonable for that, given that you have to > fetch the directory listing, parse it to figure the entry index, ... > > I want see a patch actually using that before going to merge it. > > cheers, > Gerd Absolutely, this makes sense. -- MST
