[libvirt] [PATCH 1/5] conf: allow different resource registration modes

[Martin Kletzander]

I'm so sorry for not getting to this earlier.  I though I'll get to this over
the holidays, but they were very busy with no free time for me.

On Wed, Dec 20, 2017 at 04:47:46PM +0000, Daniel P. Berrange wrote:
>Currently the QEMU driver has three ways of setting up cgroups. It either
>skips them entirely (if non-root), or uses systemd-machined, or uses
>cgroups directly.
>

So what we are trying to fix here is that all of the variations don't create the
same structure.  So it needs to be clear for the mgmt app to guess^Wknow
correctly where the domain is in the cgroup hierarchy.

>It is further possible to register directly with systemd and bypass
>machined. We don't support this by systemd-nsspawn does and we ought
>to.
>

But what's the benefit of that?

>This change adds ability to configure the mechanism for registering
>resources between all these options explicitly. via
>
>  <resource register="none|direct|machined|systemd"/>
>

I understand what you are trying to fix, but I don't quite follow why we should
expose that.  Can't we guess some of them easily?  Or are you making this part
of the PoC, but then removing it later?

For now I am OK with that, but I would rather see that as a part of qemu.conf
(or libvirtd.conf), not really in the XML.  OK for the PoC, though.
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