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This patch adds code to enable the APIC assist enlightenment which, under certain conditions, means that the guest can avoid an EOI of the local APIC and thereby avoid a VMEXIT. Use of the enlightenment by the hypervisor is under control of the toolstack, and is added to the default set. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com> Acked-by: Wei Liu <wei.liu2@citrix.com>