Re: [Xen-devel] [OSSTEST PATCH 2/2] RFC: enable CONFIG_LIVEPATCH in all relevant arm64 builds [and 1 more messages]

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 05/06/2019 14:07, Jan Beulich wrote:
> > > > On 05.06.19 at 13:31, <ian.jackson@xxxxxxxxxx> wrote:
> > I still think it would be better to fix this in the Xen code.
> Fully agree. But as Julien says - fully fixing this may be too intrusive
> for old branches (provided it gets fixed on master at all).
Well we have no other choice than fixing in master... Otherwise we are facing 
Xen to be completely unusable on newer platform.
However, it is very unlikely to be fixed in old branches because the boot/memory 
code needs a full rewrite.
> > Would it be possible to make whether to do "wrong thing A" (which does
> > not boot on rochster) or "wrong thing B" (which boots on rochester but
> > not on some other unknown machine(s)) a config or boot-time option ? >
> Since it's apparently Xen image dependent, a boot time option seems
> unlikely to be a possibility. A config option might be possible, but that,
> as you say elsewhere on another aspect, seems ridiculous. But in the
> end the Arm maintainers will know best...
None of those options looks appealing to me because we are not immune to have 
more bug looming in the future because of any backport patches that can 
decrease/increase size of Xen.
We will just have to live with it and address them as they come in stable 
branches.

Cheers,

--
Julien Grall

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