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This will be useful to report errors at a higher level, mostly in VFIO today. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/r/20240320064911.545001-9-clg@redhat.com [peterx: drop comment for ERRP_GUARD, per Markus] Signed-off-by: Peter Xu <peterx@redhat.com>