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In fact it's VT-d specific, but we don't have a way yet to build code
for just one vendor. Provide a #define for the opposite case.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Paul Durrant <paul@xen.org>