Ye cannae change the laws of physics, but you can change your mind
Apple is good at security. It's good at processors. Thus GoFetch, a major security flaw in its processor architecture, is a double whammy.
This is not only a rule of the universe, it's a big problem in cryptography. Cryptographic software uses secrets to encode and decode data, and it needs to do it in private. Modern CPUs provide plenty of privacy through memory managers that limit access to properly privileged code. This is at odds with caching. As the code component gets data from memory, it does so through caching – and a constant-time cache is no cache at all. It gives data fast if it's got it, slowly if it has to fetch it. If the cache is shared between multiple processes or cores, as it always is, then an attacker can watch cache hits and misses by timing, and extract information.How to Netflix Oracle's blockbuster audit modelCrypto code knows this and is designed to avoid it.
As to what makes things faster, well, that's a secret. The DMP idea does speed up normal operations, but Apple has disclosed very few details of its cache management systems. Instead, it took a massive cross-institution effort to reverse engineer what was going on then build and test proofs of concept.
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