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((void *)addr), 1, !protect);
39 return true;
40 }
41
42 #endif /* _ASM_S390_KFENCE_H */
43
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