[libvirt] Re: [Qemu-devel] [PATCH 1/6] Allow multiple monitor devices (v2)
Daniel P. Berrange
berrange at redhat.com
Tue Apr 14 09:17:26 UTC 2009
On Tue, Apr 14, 2009 at 12:15:23PM +0300, Avi Kivity wrote:
> Daniel P. Berrange wrote:
> >Yes indeed its a little crazy :-) As anthony mentioned if libvirt were
> >able to be notified of changes a user makes in the monitor, there's no
> >reason we could not allow end users to access the monitor of a VM
> >libvirt is managing. We just need to make sure libvirt doesn't miss
> >changes like attaching or detaching block devices, etc, because that'll
> >cause crash/data loss later when libvirt migrates or does save/restore,
> >etc because it'll launch QEMU with wrong args
> >
>
> You still have an inherent race here.
>
> user: plug in disk
> libvirt: start migration, still without disk
> qemu: libvirt, a disk has been plugged in.
That is true, but we'd still be considering direct monitor access to
be a 'expert' user mode of use. If they wish to shoot themselves in
the foot by triggering a migration at same time they are hotplugging
I'm fine if their whole leg gets blown away.
Daniel
--
|: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :|
|: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
More information about the libvir-list
mailing list