LoongArch: Add KFENCE (Kernel Electric-Fence) support

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The LoongArch architecture is quite different from other architectures.
When the allocating of KFENCE itself is done, it is mapped to the direct
mapping configuration window [1] by default on LoongArch.  It means that
it is not possible to use the page table mapped mode which required by
the KFENCE system and therefore it should be remapped to the appropriate
region.

This patch adds architecture specific implementation details for KFENCE.
In particular, this implements the required interface in <asm/kfence.h>.

Tested this patch by running the testcases and all passed.

[1] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#virtual-address-space-and-address-translation-mode

Signed-off-by: Enze Li <lienze@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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Enze Li 2023-09-06 22:54:16 +08:00 • committed by Huacai Chen

parent 95bb5b617b

commit 6ad3df56bb

4 changed files with 86 additions and 9 deletions

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1

arch/loongarch/Kconfig

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61

arch/loongarch/include/asm/kfence.h

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11

arch/loongarch/include/asm/pgtable.h

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22

arch/loongarch/mm/fault.c

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