See what the Rambam writes in Iggeres Teiman about the future [now present] golus of Yishmael: There is no point making peace with them; Dovid Hamelech was referring to Islam when he said ??? ???? ??? ???? ??? ??????, which the Rambam explains is that even as we negotiate for peace, they are at war with us.
Have a look at the Rambam’s advice on how to deal with Yishmoel.