On 6/25/19 11:16 AM, Igor Mammedov wrote:
> Fallback might affect guest or worse whole host performance
> or functionality if backing file were used to share guest RAM
> with another process.
> 
> Patch deprecates fallback so that we could remove it in future
> and ensure that QEMU will provide expected behavior and fail if
> it can't use user provided backing file.
> 
> Signed-off-by: Igor Mammedov <imamm...@redhat.com>
> ---
> v2:
>  * improve text language
>     (Markus Armbruster <arm...@redhat.com>)
> 

Is this deprecation introspectible? Does it need to be?

Do we even need a deprecation period, or can we declare this a bug fix
(it was a bug that we didn't fail outright on an impossible request) and
do it immediately?

If it is not a bug fix, perhaps it could be made introspectible by
having a new boolean parameter to opt in to the failure now, rather than
2 releases from now?

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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