The root filesystem, where mutable user and OS data and configuration are stored, is encrypted with LUKS2. This is not optional.
The branch predictor realization made it clear that this instruction was too dangerous to have anywhere in the code segment of any game – controlling when an instruction might be speculatively executed is too difficult. The branch predictor for indirect branches could, theoretically, predict any address, so there was no “safe place” to put an xdcbt instruction. And, if speculatively executed it would happily do an extended prefetch of whatever memory the specified registers happened to randomly contain. It was possible to reduce the risk, but not eliminate it, and it just wasn’t worth it. While Xbox 360 architecture discussions continue to mention the instruction I doubt that any games ever shipped with it.
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Марина Совина (ночной редактор)