Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified

[Daniel P . Berrangé]

On Thu, Apr 15, 2021 at 05:40:40PM +0100, Daniel P. Berrangé wrote:
> On Thu, Apr 15, 2021 at 12:30:11PM -0400, Eduardo Habkost wrote:
> > On Thu, Apr 15, 2021 at 12:04 PM Daniel P. Berrangé <berrange@redhat.com> 
> > wrote:
> > >
> > > Is it possible to query the migration blockers via QMP ?
> > 
> > I don't think it is, but we can add that if it's useful for libvirt.
> 
> I think it would be useful.

To expand on how it could be used by a libvirt client if we could wire
this up in our message reporting API.

A client app using libvirt python API would do:

    msgs = dom.getMessages(libvirt.VIR_DOMAIN_MESSAGES_MIGBLOCKERS)

    if len(msgs) > 0:
        print("Domain %s uses features that block migration" % dom.getName())
        for msg in msgs:
           print("   >> %s" % msg)


Migration blockers change over time, as hardware is hotplugged/unplugged,
so this isn't a one-off thing. The list of blockers is only valid at the
point in time that it is queried.

Regards,
Daniel
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