arm64: head: split off idmap creation code

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Split off the creation of the ID map page tables, so that we can avoid
running it again unnecessarily when KASLR is in effect (which only
randomizes the virtual placement). This will permit us to drop some
explicit cache maintenance to the PoC which was necessary because the
cache invalidation being performed on some global variables might
otherwise clobber unrelated variables that happen to share a cacheline.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220624150651.1358849-8-ardb@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

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Ard Biesheuvel 2022-06-24 17:06:37 +02:00 • committed by Will Deacon

parent 50fcd39d24

commit e42ade29e3

1 changed files with 52 additions and 49 deletions

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