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On newer xend (v3.x and after) there is no state and domid reported for inactive domains. When initially creating connections this is handled in various places by assigning domain->id = -1. But once an instance has been running, the id is set to the current domain id. And it does not change when the instance is shut down. So when querying the domain info, the hypervisor driver, which gets asked first will indicate it cannot find information, then the xend driver is asked and will set the status to NOSTATE because it checks for the -1 domain id. Checking domain/status for 0 seems to be more reliable for that. One note: I am not sure whether the domain->id also should get set back to -1 whenever any sub-driver thinks the instance is no longer running. BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=746007 BugLink: http://bugs.launchpad.net/bugs/929626 Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
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>