+=item B<virt>
+
+Some sort of virtualization appears to be present, but we are not sure
+what it is. In some very rare corner cases where we know that
+virtualization is hard to detect, we will try a timing attack to see
+if certain machine instructions are running much more slowly than they
+should be, which would indicate virtualization. In this case, the
+generic fact C<virt> is printed.
+