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arm64: Simplify and improve KASAN shadow map bootstrapping
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Authored by markj on Jan 11 2024, 10:48 PM.
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Details

Summary
  • Move pmap_bootstrap_allocate_kasan_l2() close to the place where it is actually used.
  • Simplify pmap_bootstrap_allocate_kasan_l2() a bit: eliminate some unneeded variables and zero and exclude each 2MB mapping as we go rather than doing that all at once. Excluded regions will be coalesced.
  • As a consequence of the previous point, ensure that we do not zero a preexisting 2MB mapping.
  • Simplify pmap_bootstrap_san() and prepare it to work with KMSAN.

Sponsored by: Klara, Inc.
Sponsored by: Juniper Networks, Inc.

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rG FreeBSD src repository
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