On Tue, 2012-06-19 at 23:00 +0200, Alexander Graf wrote: > How is the problem different from RAM? It's a 16MB region that can be > accessed by the guest even during transfer time, so it can get dirty > during the migration. But we only need to really transfer the last > small delta at the end of the migration, right?
Because with -M pseries it's not mapped into guest space but instead is a chunk of physically contiguous memory accessed directly in real mode by KVM. So no dirty tracking here. We could keep track manually maybe using some kind of dirty bitmap of changes to the hash table but that would add overhead to things like H_ENTER. Cheers, Ben.
