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Useful mainly for migration. cpuUpdate changes guest CPU requirements in the following way: - match == "strict" || match == "exact" - optional features which are supported by host CPU are changed into required features - optional features which are not supported by host CPU are disabled - all other features remain untouched - match == "minimum" - match is changed into "exact" - optional features and all features not mentioned in guest CPU specification which are supported by host CPU become required features - other optional features are disabled - all other features remain untouched This ensures that no feature will suddenly disappear from the guest after 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>
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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