1a2feeb2cSChristophe Leroy // SPDX-License-Identifier: GPL-2.0 2a2feeb2cSChristophe Leroy 3a2feeb2cSChristophe Leroy #define DISABLE_BRANCH_PROFILING 4a2feeb2cSChristophe Leroy 5a2feeb2cSChristophe Leroy #include <linux/kasan.h> 6a2feeb2cSChristophe Leroy #include <linux/memblock.h> 7a2feeb2cSChristophe Leroy #include <linux/hugetlb.h> 8a2feeb2cSChristophe Leroy #include <asm/pgalloc.h> 9a2feeb2cSChristophe Leroy 10a2feeb2cSChristophe Leroy static int __init 11a2feeb2cSChristophe Leroy kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block) 12a2feeb2cSChristophe Leroy { 13e05c7b1fSMike Rapoport pmd_t *pmd = pmd_off_k(k_start); 14a2feeb2cSChristophe Leroy unsigned long k_cur, k_next; 15a2feeb2cSChristophe Leroy 16a2feeb2cSChristophe Leroy for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd += 2, block += SZ_8M) { 17a2feeb2cSChristophe Leroy pte_basic_t *new; 18a2feeb2cSChristophe Leroy 19a2feeb2cSChristophe Leroy k_next = pgd_addr_end(k_cur, k_end); 20a2feeb2cSChristophe Leroy k_next = pgd_addr_end(k_next, k_end); 21a2feeb2cSChristophe Leroy if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte) 22a2feeb2cSChristophe Leroy continue; 23a2feeb2cSChristophe Leroy 24a2feeb2cSChristophe Leroy new = memblock_alloc(sizeof(pte_basic_t), SZ_4K); 25a2feeb2cSChristophe Leroy if (!new) 26a2feeb2cSChristophe Leroy return -ENOMEM; 27a2feeb2cSChristophe Leroy 28a2feeb2cSChristophe Leroy *new = pte_val(pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block)), PAGE_KERNEL))); 29a2feeb2cSChristophe Leroy 30a2feeb2cSChristophe Leroy hugepd_populate_kernel((hugepd_t *)pmd, (pte_t *)new, PAGE_SHIFT_8M); 31a2feeb2cSChristophe Leroy hugepd_populate_kernel((hugepd_t *)pmd + 1, (pte_t *)new, PAGE_SHIFT_8M); 32a2feeb2cSChristophe Leroy } 33a2feeb2cSChristophe Leroy return 0; 34a2feeb2cSChristophe Leroy } 35a2feeb2cSChristophe Leroy 36a2feeb2cSChristophe Leroy int __init kasan_init_region(void *start, size_t size) 37a2feeb2cSChristophe Leroy { 38a2feeb2cSChristophe Leroy unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start); 39a2feeb2cSChristophe Leroy unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size); 40a2feeb2cSChristophe Leroy unsigned long k_cur; 41a2feeb2cSChristophe Leroy int ret; 42a2feeb2cSChristophe Leroy void *block; 43a2feeb2cSChristophe Leroy 44a2feeb2cSChristophe Leroy block = memblock_alloc(k_end - k_start, SZ_8M); 45a2feeb2cSChristophe Leroy if (!block) 46a2feeb2cSChristophe Leroy return -ENOMEM; 47a2feeb2cSChristophe Leroy 48a2feeb2cSChristophe Leroy if (IS_ALIGNED(k_start, SZ_8M)) { 49a2feeb2cSChristophe Leroy kasan_init_shadow_8M(k_start, ALIGN_DOWN(k_end, SZ_8M), block); 50a2feeb2cSChristophe Leroy k_cur = ALIGN_DOWN(k_end, SZ_8M); 51a2feeb2cSChristophe Leroy if (k_cur == k_end) 52a2feeb2cSChristophe Leroy goto finish; 53a2feeb2cSChristophe Leroy } else { 54a2feeb2cSChristophe Leroy k_cur = k_start; 55a2feeb2cSChristophe Leroy } 56a2feeb2cSChristophe Leroy 57a2feeb2cSChristophe Leroy ret = kasan_init_shadow_page_tables(k_start, k_end); 58a2feeb2cSChristophe Leroy if (ret) 59a2feeb2cSChristophe Leroy return ret; 60a2feeb2cSChristophe Leroy 61a2feeb2cSChristophe Leroy for (; k_cur < k_end; k_cur += PAGE_SIZE) { 62e05c7b1fSMike Rapoport pmd_t *pmd = pmd_off_k(k_cur); 63a2feeb2cSChristophe Leroy void *va = block + k_cur - k_start; 64a2feeb2cSChristophe Leroy pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL); 65a2feeb2cSChristophe Leroy 66a2feeb2cSChristophe Leroy if (k_cur < ALIGN_DOWN(k_end, SZ_512K)) 67a2feeb2cSChristophe Leroy pte = pte_mkhuge(pte); 68a2feeb2cSChristophe Leroy 69a2feeb2cSChristophe Leroy __set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0); 70a2feeb2cSChristophe Leroy } 71a2feeb2cSChristophe Leroy finish: 72a2feeb2cSChristophe Leroy flush_tlb_kernel_range(k_start, k_end); 73a2feeb2cSChristophe Leroy return 0; 74a2feeb2cSChristophe Leroy } 75