diff options
Diffstat (limited to 'arch/loongarch/include/asm')
| -rw-r--r-- | arch/loongarch/include/asm/kfence.h | 61 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/pgtable.h | 11 |
2 files changed, 71 insertions, 1 deletions
diff --git a/arch/loongarch/include/asm/kfence.h b/arch/loongarch/include/asm/kfence.h new file mode 100644 index 000000000000..6c82aea1c993 --- /dev/null +++ b/arch/loongarch/include/asm/kfence.h @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * KFENCE support for LoongArch. + * + * Author: Enze Li <lienze@kylinos.cn> + * Copyright (C) 2022-2023 KylinSoft Corporation. + */ + +#ifndef _ASM_LOONGARCH_KFENCE_H +#define _ASM_LOONGARCH_KFENCE_H + +#include <linux/kfence.h> +#include <asm/pgtable.h> +#include <asm/tlb.h> + +static inline bool arch_kfence_init_pool(void) +{ + int err; + char *kfence_pool = __kfence_pool; + struct vm_struct *area; + + area = __get_vm_area_caller(KFENCE_POOL_SIZE, VM_IOREMAP, + KFENCE_AREA_START, KFENCE_AREA_END, + __builtin_return_address(0)); + if (!area) + return false; + + __kfence_pool = (char *)area->addr; + err = ioremap_page_range((unsigned long)__kfence_pool, + (unsigned long)__kfence_pool + KFENCE_POOL_SIZE, + virt_to_phys((void *)kfence_pool), PAGE_KERNEL); + if (err) { + free_vm_area(area); + __kfence_pool = kfence_pool; + return false; + } + + return true; +} + +/* Protect the given page and flush TLB. */ +static inline bool kfence_protect_page(unsigned long addr, bool protect) +{ + pte_t *pte = virt_to_kpte(addr); + + if (WARN_ON(!pte) || pte_none(*pte)) + return false; + + if (protect) + set_pte(pte, __pte(pte_val(*pte) & ~(_PAGE_VALID | _PAGE_PRESENT))); + else + set_pte(pte, __pte(pte_val(*pte) | (_PAGE_VALID | _PAGE_PRESENT))); + + preempt_disable(); + local_flush_tlb_one(addr); + preempt_enable(); + + return true; +} + +#endif /* _ASM_LOONGARCH_KFENCE_H */ 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 |