Re: [PATCH] Remove unnecessary minimum_version_id_old fields

[Peter Maydell]

On Tue, 18 Jan 2022 at 10:44, Peter Maydell <peter.maydell@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 20220118104150.1899661-1-clg@kaod.org/">https://patchew.org/QEMU/20220118104150.1899661-1-clg@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