Re: [Qemu-devel] [PATCH 0/2] Add error reporting in migration

[John Snow <jsnow@redhat.com>]

On 09/27/2016 02:56 PM, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
>
> At the moment if you use a VMSTATE_*_EQUAL macro and the value
> doesn't match you just get an error about the section that failed
>
> e.g.
>   qemu-system-ppc64: error while loading state for instance 0x0 of device 'cpu'
>   qemu-system-ppc64: load of migration failed: Invalid argument
>
> with this pair you get the field and the mismatched values.
> e.g.
>   qemu-system-ppc64: 8000600FE1FF7AE1 != 8000600FE1FF3A21
>   qemu-system-ppc64: Failed to load cpu:env.insns_flags
>   qemu-system-ppc64: error while loading state for instance 0x0 of device 'cpu'
>   qemu-system-ppc64: load of migration failed: Invalid argument
>
> which is much more likely to point you at the culprit.
>
> (Broken out from a larger vmstatification series, the only change since
> then is the values are printed in hex except for the le case).
>
> Dave
>
> Dr. David Alan Gilbert (2):
>   migration: report an error giving the failed field
>   migration: Report values for comparisons
>
>  migration/vmstate.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>

I see this as a strict improvement; though I don't know if there will be 
complaints about printing error messages instead of adding pathways for 
the Error object.

Meh. Existing errors here simply use error_report anyway, so:

Reviewed-by: John Snow <jsnow@redhat.com>