You want to protect against multiprocessor attacks through MESI. At which point I just have no idea of what to do purely in hardware. The best system design ch

You want to protect against multiprocessor attacks through MESI. At which point I just have no idea of what to do purely in hardware. The best system design change IMO would be to tag at programming language level (to systematize the introduction of the needed barriers, without needing too many of them, thus minimizing the overhead -- which is a must otherwise you can as well remove OOO entirely), but I suspect that's not going to happen for most systems. Or even any of them.