[libvirt] question about guest status

Wen Congyang wency at cn.fujitsu.com
Wed Feb 15 06:44:18 UTC 2012

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?

Wen Congyang

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