3783f814e7
Use vmstate_save_state_with_err() to improve error reporting in the callers and store a reported error under the migration stream. Add documentation while at it. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Avihai Horon <avihaih@nvidia.com> Signed-off-by: Cédric Le Goater <clg@redhat.com>