On Fri, Aug 3, 2012 at 9:49 AM, Eric Blake <eblake@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.
-- Eric Blake eblake@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org