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Originally most of libvirt domain-specific calls were blocking during a migration. A new mechanism to allow specific calls (blkstat/blkinfo) to be executed in such condition has been implemented. In the long term it'd be desirable to get a more general solution to mark further APIs as migration safe, without needing special case code. * src/qemu/qemu_migration.c: add some additional job signal flags for doing blkstat/blkinfo during a migration * src/qemu/qemu_domain.c: add a condition variable that can be used to efficiently wait for the migration code to clear the signal flag * src/qemu/qemu_driver.c: execute blkstat/blkinfo using the job signal flags during migration
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>