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If Viridian extensions are enabled, Windows wouldn't currently allow a hotplugged vCPU to be brought up dynamically. We need to expose a special bit to let the guest know we allow it. Hide it behind an option to stay on the safe side regarding compatibility with existing guests but nevertheless set the option on by default. Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com> Reviewed-by: Paul Durrant <paul@xen.org> Acked-by: Anthony PERARD <anthony.perard@citrix.com>