Hi,
- Dor/mst proposal of optional features
This came from previous discussions, Dor want to put optional fields
in the savevm protocol that target can just discard.
Taking that one to the next level: Simply save all fields with name and
size. qemu can skip and ignore unknown fields load time. No version
numbers are needed any more (except for loading old images), and all the
issues with non-linear version numbering of devices are suddenly gone.
The big drawback: it only helps for 0.12+ because that pretty much
depends on having vmstate on both sending and receiving side.
If qemu-0.12 should be able to save qemu-0.11 too, we could go for
something simple, like a static list of device+savevm versions, without
creating a maintainance nightmare because it has to handle only the
single migrate-to-0.11 special case.
cheers,
Gerd
