[libvirt] question about guest status

Hi all: If the guest runs on xen, we can know the guest OS paniced, and the guest status is paniced. But if the guest runs on qemu/kvm, we need the same feature. And the feature to know guest-is-panic is a very very good feature for enterprise. We have some ways to know that guest has paniced: 1. watchdog timeouts It is not a good way, because we can not say "the guest is paniced" in 100% accuracy 2. use a PV driver(like the XEN) The old RHELs do not have such driver... It can not work for the second kernel... 3. Adding a function for console-logging (in ring buffer or some) and check messages given by guests. If we allow some filtering script or some, we can catch Linux's panic messages. We can say the guest paniced if we catch such messages. We may be able to catch other events by other script I prefer to 3 now. Does anyone have a better idea? Thanks Wen Congyang