Generalizing address-space isolation

Linux systems have traditionally run with a single address space that is shared by user and kernel space. That changed with the advent of the Meltdown vulnerability, which forced the merging of kernel page-table isolation (KPTI) at the end of 2017. But, Mike Rapoport said during his 2019 Open Source Summit Europe talk, that may not be the end of the story for address-space isolation. There is a good case to be made for increasing the separation of address spaces, but implementing that may require some fundamental changes in how kernel memory management works.

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