On Tue, 18 Jan 2022 at 10:44, Peter Maydell <peter.mayd...@linaro.org> wrote: > > The migration code will not look at a VMStateDescription's > minimum_version_id_old field unless that VMSD has set the > load_state_old field to something non-NULL. (The purpose of > minimum_version_id_old is to specify what migration version is needed > for the code in the function pointed to by load_state_old to be able > to handle it on incoming migration.) > > We have exactly one VMSD which still has a load_state_old, > in the PPC CPU; every other VMSD which sets minimum_version_id_old > is doing so unnecessarily. Delete all the unnecessary ones.
...and https://patchew.org/QEMU/20220118104150.1899661-1-...@kaod.org/ proposes removing that PPC usage, so once both this patch and that one go in we can delete the migration/ code relating to load_state_old. -- PMM
