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Re: [PATCH RFC] migration: warn about non-migratable configurations unle
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified |
Date: |
Mon, 19 Apr 2021 19:47:34 +0100 |
User-agent: |
Mutt/2.0.6 (2021-03-06) |
* Daniel P. Berrangé (berrange@redhat.com) wrote:
> On Mon, Apr 19, 2021 at 06:15:56PM +0100, Daniel P. Berrangé wrote:
> > On Mon, Apr 19, 2021 at 06:11:47PM +0100, Dr. David Alan Gilbert wrote:
> > > * Eduardo Habkost (ehabkost@redhat.com) wrote:
> > > > I would make live migration policy an enum, just to make sure
> > > > we are explicit about the requirements:
> > > >
> > > > - UNKNOWN: this is the current state in QEMU 6.0, where we don't
> > > > really know what the user expects.
> > > > This can be the default on existing versioned machine types,
> > > > just for compatibility.
> > > > I suggest making this print warnings for every migration
> > > > blocker (like this patch does).
> > > > I suggest deprecating this behavior as soon as we can.
> > > >
> > > > - PREFERRED: try to make the VM migratable when possible, but
> > > > don't print a warning or error out if migration is blocked.
> > > > This seems to be the behavior expected by libvirt today.
> > > >
> > > > - NOT_NEEDED: live migration is not needed, and QEMU is free to
> > > > enable features that block live migration or change guest ABI.
> > > > We can probably make this the default on machine types that
> > > > never supported live migration.
> > >
> > > I suggest you could do this by adding:
> > > -warn-none-migratable
> > > -no-warn-none-migratable
> > >
> > > and then argue about defaults another time.
> >
> > If we're going to add new args, lets at least future proof our
> > approach with an extensible option that we can wire into QMP
> > too later
> >
> > -migratable none|preferred|required
> >
> > and letting us add extra key/value pairs to tune it if desired.
>
> Having said that, we potentially don't need a dedicated arg if we
> just make 'migratable=none|preferred|required' be a property of
> the machine type and hook everything off that
I think my only difficulty with that is that I don't find any of those
3 words 'obvious'.
Dave
> >
> > > > - REQUIRED: live migration is required, and adding a migration
> > > > blocker would be a fatal error.
> > > > This is already implemented by --only-migratable.
> > > > I suggest making this the default on versioned machine types
> > > > after a few releases, and after deprecating UNKNOWN.
>
> Regards,
> Daniel
> --
> |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
> |: https://libvirt.org -o- https://fstop138.berrange.com :|
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--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, (continued)
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Dr. David Alan Gilbert, 2021/04/15
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Vitaly Kuznetsov, 2021/04/16
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Eduardo Habkost, 2021/04/16
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Markus Armbruster, 2021/04/17
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Daniel P . Berrangé, 2021/04/19
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Eduardo Habkost, 2021/04/19
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Dr. David Alan Gilbert, 2021/04/19
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Daniel P . Berrangé, 2021/04/19
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Daniel P . Berrangé, 2021/04/19
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified,
Dr. David Alan Gilbert <=
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Eduardo Habkost, 2021/04/19
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Dr. David Alan Gilbert, 2021/04/20
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Eduardo Habkost, 2021/04/20
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Dr. David Alan Gilbert, 2021/04/20
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Daniel P . Berrangé, 2021/04/20
- Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Eduardo Habkost, 2021/04/20
Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Markus Armbruster, 2021/04/17
Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified, Peter Maydell, 2021/04/18