arm64/mm: Add uffd write-protect support

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Let's use the newly-free PTE SW bit (58) to add support for uffd-wp.

The standard handlers are implemented for set/test/clear for both pte
and pmd. Additionally we must also track the uffd-wp state as a pte swp
bit, so use a free swap pte bit (3).

Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Link: https://lore.kernel.org/r/20240503144604.151095-5-ryan.roberts@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

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Ryan Roberts 2024-05-03 15:46:02 +01:00 • committed by Will Deacon

parent 55564814a8

commit 5b32510af7

3 changed files with 53 additions and 0 deletions

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1

arch/arm64/Kconfig

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8

arch/arm64/include/asm/pgtable-prot.h

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44

arch/arm64/include/asm/pgtable.h

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