Re: [PATCH 5/6] migration: Rephrase message on failure to save / load Xen device state

[Peter Xu]

On Mon, May 13, 2024 at 04:17:02PM +0200, Markus Armbruster wrote:
> Functions that use an Error **errp parameter to return errors should
> not also report them to the user, because reporting is the caller's
> job.  When the caller does, the error is reported twice.  When it
> doesn't (because it recovered from the error), there is no error to
> report, i.e. the report is bogus.
> 
> qmp_xen_save_devices_state() and qmp_xen_load_devices_state() violate
> this principle: they call qemu_save_device_state() and
> qemu_loadvm_state(), which call error_report_err().
> 
> I wish I could clean this up now, but migration's error reporting is
> too complicated (confused?) for me to mess with it.

:-(

> 
> Instead, I'm merely improving the error reported by
> qmp_xen_load_devices_state() and qmp_xen_load_devices_state() to the
> QMP core from
> 
>     An IO error has occurred
> 
> to
>     saving Xen device state failed
> 
> and
> 
>     loading Xen device state failed
> 
> respectively.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>

Acked-by: Peter Xu <peterx@redhat.com>

-- 
Peter Xu