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| author | Enze Li <lienze@kylinos.cn> | 2023-09-06 17:54:16 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-09-06 17:54:16 +0300 |
| commit | 6ad3df56bb199134800933df2afcd7df3b03ef33 (patch) | |
| tree | 28d3247260414f73d95d16110d4725c62eec38a0 /arch/loongarch/include/asm/pgtable.h | |
| parent | 95bb5b617beec0275bcc47b68796b34852fe4ecb (diff) | |
| download | linux-6ad3df56bb199134800933df2afcd7df3b03ef33.tar.xz | |
LoongArch: Add KFENCE (Kernel Electric-Fence) support
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>
Diffstat (limited to 'arch/loongarch/include/asm/pgtable.h')
| -rw-r--r-- | arch/loongarch/include/asm/pgtable.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index 338d1b147464..7e3708883994 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -82,14 +82,23 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) #define MODULES_END (MODULES_VADDR + SZ_256M) +#ifdef CONFIG_KFENCE +#define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE) +#else +#define KFENCE_AREA_SIZE 0 +#endif + #define VMALLOC_START MODULES_END #define VMALLOC_END \ (vm_map_base + \ - min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE) + min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE) #define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK)) #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1) +#define KFENCE_AREA_START (VMEMMAP_END + 1) +#define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1) + #define pte_ERROR(e) \ pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) #ifndef __PAGETABLE_PMD_FOLDED |