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The libxl driver has long supported migration V3 but has never indicated so in the connectSupportsFeature API. As a result, apps such as virt-manager that use the more generic virDomainMigrate API fail with libvirtError: this function is not supported by the connection driver: virDomainMigrate Add VIR_DRV_FEATURE_MIGRATION_V3 to the list of features marked as supported in the connectSupportsFeature API.
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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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