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Most hypervisors use Hardware Assisted Paging by default and don't require specifying the feature in domain conf. But some hypervisors support disabling HAP on a per-domain basis. To enable HAP by default yet provide a knob to disable it, extend the <hap> feature with a 'state=on|off' attribute, similar to <pvspinlock> and <vmport> features. In the absence of <hap>, the hypervisor default (on) is used. <hap> without the state attribute would be the same as <hap state='on'/> for backwards compatibility. And of course <hap state='off'/> disables hap. Signed-off-by: Jim Fehlig <jfehlig@suse.com>
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>