1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef _ASM_S390_KFENCE_H 4 #define _ASM_S390_KFENCE_H 5 6 #include <linux/mm.h> 7 #include <linux/kfence.h> 8 #include <asm/set_memory.h> 9 #include <asm/page.h> 10 11 void __kernel_map_pages(struct page *page, int numpages, int enable); 12 13 static __always_inline bool arch_kfence_init_pool(void) 14 { 15 return true; 16 } 17 18 #define arch_kfence_test_address(addr) ((addr) & PAGE_MASK) 19 20 /* 21 * Do not split kfence pool to 4k mapping with arch_kfence_init_pool(), 22 * but earlier where page table allocations still happen with memblock. 23 * Reason is that arch_kfence_init_pool() gets called when the system 24 * is still in a limbo state - disabling and enabling bottom halves is 25 * not yet allowed, but that is what our page_table_alloc() would do. 26 */ 27 static __always_inline void kfence_split_mapping(void) 28 { 29 #ifdef CONFIG_KFENCE 30 unsigned long pool_pages = KFENCE_POOL_SIZE >> PAGE_SHIFT; 31 32 set_memory_4k((unsigned long)__kfence_pool, pool_pages); 33 #endif 34 } 35 36 static inline bool kfence_protect_page(unsigned long addr, bool protect) 37 { 38 __kernel_map_pages(virt_to_page(addr), 1, !protect); 39 return true; 40 } 41 42 #endif /* _ASM_S390_KFENCE_H */ 43