Re: [PATCH v9 3/7] migration: Add save_postcopy_prepare() savevm handler

[Fabiano Rosas <farosas@suse.de>]

Prasad Pandit <ppandit@redhat.com> writes:

> From: Peter Xu <peterx@redhat.com>
>
> Add a savevm handler for a module to opt-in sending extra sections right
> before postcopy starts, and before VM is stopped.
>
> RAM will start to use this new savevm handler in the next patch to do flush
> and sync for multifd pages.
>
> Note that we choose to do it before VM stopped because the current only
> potential user is not sensitive to VM status, so doing it before VM is
> stopped is preferred to enlarge any postcopy downtime.
>
> It is still a bit unfortunate that we need to introduce such a new savevm
> handler just for the only use case, however it's so far the cleanest.
>
> Signed-off-by: Peter Xu <peterx@redhat.com>
> Signed-off-by: Prasad Pandit <pjp@fedoraproject.org>

Reviewed-by: Fabiano Rosas <farosas@suse.de>