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Sometimes after domain restart agent is unavailabe even if it is up and running in guest. Diagnostic message is "QEMU guest agent is not available due to an error" that is 'priv->agentError' is set. Investiagion shows that 'priv->agent' is not NULL, so error flag is set probably during domain shutdown process and not cleaned up eventually. The patch is quite simple - just clean up error flag unconditionally upon domain stop. Other hunks address other cases when error flag is not cleaned up. 1. processSerialChangedEvent. We need to clean error flag unconditionally here too. For example if upon first 'connected' event we fail to connect and set error flag and then connect on second 'connected' event then error flag will remain set erroneously and make agent unavailable. 2. qemuProcessHandleAgentEOF. If error flag is set and we get EOF we need to change state (and diagnostic) from 'error' to 'not connected'.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>