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1) Both "qemuDomainStartWithFlags" and "qemuAutostartDomain" try to restore the domain from managedsave'ed image if it exists (by invoking "qemuDomainObjRestore"), but it unlinks the image even if restoring fails, which causes data loss. (This problem exists for "virsh managedsave dom; virsh start dom"). The fix for is to unlink the managed state file only if restoring succeeded. 2) For "virsh save dom; virsh restore dom;", it can cause data corruption if one reuse the saved state file for restoring. Add doc to tell user about it. 3) In "qemuDomainObjStart", if "managed_save" is NULL, we shouldn't fallback to start the domain, skipping it to cleanup as a incidental fix. Discovered by Eric.
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>