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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.
8d616decc5
Before issuing monitor commands it is neccessary to check whether the guest is still running. Most places use virDomainIsActive() correctly, but a few relied on 'priv->mon != NULL'. In theory these should be equivalent, but the release of the last reference count on priv->mon can be delayed a small amount of time until the event handler is finally deregistered. A further ref counting bug also means that priv->mon might be never released. In such a case, code could mistakenly issue a monitor command and wait for a response that will never arrive, effectively leaving the QEMU driver waiting on virCondWait() forever.. To protect against these possibilities, make sure all code uses virDomainIsActive(), not 'priv->mon != NULL' * src/qemu/qemu_driver.c: Replace 'priv->mon != NULL' with calls to 'priv->mon != NULL'() |
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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>