[libvirt-users] Determine state of the guest OS/kernel from host

[Harish Patil]

On Fri, Aug 3, 2012 at 9:49 AM, Eric Blake <eblake at redhat.com> wrote:

> [please don't top-post on technical lists]
>
> On 08/03/2012 09:02 AM, Harish Patil wrote:
> > Thanks Michal.
> > Yes I do not have a screen, the host and the guests are running on an
> > embedded device.
> > The real requirement is:
> > Is there a way that I can register with libvirt for the state change
> > notifications in the guest OS?
> > Is it possible?
> > I need to take some actions in the host based on the guest OS state
> change.
>
> How would you do this in a network of bare metal machines?  You may be
> better served by setting up actions based on network messages sent by
> the guest, the way you would with one bare-metal machine reporting to
> another.  Also, this sounds more like something that a guest agent would
> have to coordinate at a higher level than libvirt, as there is nothing
> inherent in running qemu that tells libvirt what the guest inside the
> qemu process is doing.  virt-dmesg' ability to peek at guest memory is
> about the best you will be able to do through libvirt.
>
> >>
>
Thanks Eric. Understand that there is no such facility at the libvirt
level. Do you know whether such notification can be received/trapped at the
qemu level itself ? I had once checked that QEVENT_RESET event is emitted
when the guest OS reboots.



> >> 1: http://people.redhat.com/~rjones/virt-dmesg/
>
> --
> Eric Blake   eblake at redhat.com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/libvirt-users/attachments/20120803/129e8a16/attachment.htm>