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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_RISCV_KFENCE_H #define _ASM_RISCV_KFENCE_H #include #include #include #include static inline int split_pmd_page(unsigned long addr) { int i; unsigned long pfn = PFN_DOWN(__pa((addr & PMD_MASK))); pmd_t *pmd = pmd_off_k(addr); pte_t *pte = pte_alloc_one_kernel(&init_mm); if (!pte) return -ENOMEM; for (i = 0; i < PTRS_PER_PTE; i++) set_pte(pte + i, pfn_pte(pfn + i, PAGE_KERNEL)); set_pmd(pmd, pfn_pmd(PFN_DOWN(__pa(pte)), PAGE_TABLE)); flush_tlb_kernel_range(addr, addr + PMD_SIZE); return 0; } static inline bool arch_kfence_init_pool(void) { int ret; unsigned long addr; pmd_t *pmd; for (addr = (unsigned long)__kfence_pool; is_kfence_address((void *)addr); addr += PAGE_SIZE) { pmd = pmd_off_k(addr); if (pmd_leaf(*pmd)) { ret = split_pmd_page(addr); if (ret) return false; } } return true; }