Re: [PATCH v5] tools/xenstore: add migration stream extensions for new features

[Julien Grall <julien@xxxxxxx>]

On 08/09/2022 11:12, Julien Grall wrote:
> Hi Juergen,
>
> On 08/09/2022 09:15, Juergen Gross wrote:
> > Extend the definition of the Xenstore migration stream to cover new
> > features:
> >
> > - per domain features
> > - extended watches (watch depth)
> > - per domain quota
> >
> > Some of those additions (per domain features and extended watches)
> > require bumping the migration stream version to "2", as usage of those
> > features will require to transport mandatory new information in the
> > migration stream.
> >
> > One note regarding the GLOBAL_QUOTA_DATA record: the split of quota
> > between global and per-domain ones is meant to support the possibility
> > to pass on unknown quota settings for newly created domains to other
> > Xenstore instances:
> >
> > Imagine Xenstore A knows about global quota g and domain quota d, while
> > Xenstore B doesn't know both. Initially I'm running Xenstore A on a
> > host, then I'm live-updating to B.
> >
> > B gets the information that g is global, and d is per-domain, but has
> > no other idea what to do with the values of g and d. OTOH it knows that
> > each new domain should get d with the related value, so it can set d
> > for each newly created domain.
> >
> > When B is either downgraded to A again, or a domain is migrated to
> > another host running A, B can add the quota information of d for all
> > domains.
> >
> > Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
I have committed it.

Cheers,

--
Julien Grall