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Re: [Xen-devel] [PATCH v2] libxl: add stdvga video memory setting with upstream qemu



>>> On 19.05.14 at 13:41, <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> Fabio Fantoni writes ("Re: [PATCH v2] libxl: add stdvga video memory setting 
> with upstream qemu"):
>> Il 15/05/2014 18:00, Ian Campbell ha scritto:
>> > Acked + applied. I reworded the commit message a bit to:
>> >      libxl: add stdvga video memory setting with upstream qemu
>> >      
>> >      Currently we set the stdvga video memory with qemu-traditional only, 
> add the
>> >      necessary settings for qemu upstream too.
>> >      
>> >      Signed-off-by: Fabio Fantoni <fabio.fantoni@xxxxxxx>
>> >      Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
>> >
>> >
>> >
>> Thanks.
>> I think that this patch can be also backported to xen 4.4.
> 
> I think this falls on the bugfix side of the line, but:
> 
> I worry that it might cause regressions in existing setups, because it
> changes the interpretation of the domain config file (from a incorrect
> to a correct interpretation, but that is still a problem for a
> backport).
> 
> So I would be inclined not to backport this one.  I've added Jan, the
> hypervisor-side stable tree maintainer, in case he has a different
> view.

Help me understand the implications on the guest that this
changed (corrected) interpretation of the config file would have:
Would the guest see differing resources between reboots? Would
such differences also surface post-migration (which would pretty
clearly make this a no-go for a backport)?

Jan


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