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Daniel P. Berrange 8e7d14953c Fix virDomainObj ref handling in QEMU driver
Since the monitor I/O is processed out of band from the main
thread(s) invoking monitor  commands, the virDomainObj may be
deleted by the I/O thread. The qemuDomainObjBeginJob takes an
extra reference to protect against final deletion, but this
reference is released by the corresponding EndJob call. THus
after the EndJob call it may not be valid to reference the
virDomainObj any more. To allow callers to detect this, the
EndJob call is changed to return the remaining reference count.

* src/conf/domain_conf.c: Make virDomainObjUnref return the
  remaining reference count
* src/qemu/qemu_driver.c: Avoid referencing virDomainObjPtr
  after qemuDomainObjEndJob if it has been deleted.
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         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>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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