Sounds like we would need a new paradigm for how to handle that. But it seems to me that x86 is in now way the panacea of COU design. Wouldn’t you gain some good trade offs by changing up how things are done?
MMap'd files, and... in-demand paging... are pretty much on every CPU architecture worth making an application for. ARM, POWER9, X86, SPARC, MIPS, and more.
In-demand paging is another situation where a simple pointer-dereference can suddenly turn into a filesystem (and therefore: kernel-level / hardware-level) call.
What the commenter above you was describing about mmap'ed files and dereferencing invoking the kernel implicitly -- that's true on all current CPU architectures (everything from x86 to SPARC to ARM and back again.)
