diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2024-02-14 13:29:21 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2024-02-16 12:42:40 +0000 |
| commit | 0383808e4d99ac31892655ae9dc93597eb6f1412 (patch) | |
| tree | 2027a25a96234778cebf4d9ea624f5f747af4048 /arch/arm64/Kconfig | |
| parent | 6ed8a3a094b43a27ac35e5c95a8004a1d83d1b79 (diff) | |
arm64: kasan: Reduce minimum shadow alignment and enable 5 level paging
Allow the KASAN init code to deal with 5 levels of paging, and relax the
requirement that the shadow region is aligned to the top level pgd_t
size. This is necessary for LPA2 based 52-bit virtual addressing, where
the KASAN shadow will never be aligned to the pgd_t size. Allowing this
also enables the 16k/48-bit case for KASAN, which is a nice bonus.
This involves some hackery to manipulate the root and next level page
tables without having to distinguish all the various configurations,
including 16k/48-bits (which has a two entry pgd_t level), and LPA2
configurations running with one translation level less on non-LPA2
hardware.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-80-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 8c2c36fffcf5..9ca3316d6379 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -164,7 +164,7 @@ config ARM64 select HAVE_ARCH_HUGE_VMAP select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_JUMP_LABEL_RELATIVE - select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48) + select HAVE_ARCH_KASAN select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN select HAVE_ARCH_KASAN_HW_TAGS if (HAVE_ARCH_KASAN && ARM64_MTE) |