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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9b081e10 CL |
2 | /* |
3 | * PowerPC version | |
4 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
5 | * | |
6 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | |
7 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
8 | * Copyright (C) 1996 Paul Mackerras | |
9 | * | |
10 | * Derived from "arch/i386/mm/init.c" | |
11 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
12 | * | |
13 | * Dave Engebretsen <engebret@us.ibm.com> | |
14 | * Rework for PPC64 port. | |
9b081e10 CL |
15 | */ |
16 | ||
17 | #undef DEBUG | |
18 | ||
19 | #include <linux/string.h> | |
20 | #include <asm/pgalloc.h> | |
21 | #include <asm/pgtable.h> | |
69795cab CL |
22 | #include <asm/kup.h> |
23 | ||
0fb1c25a | 24 | static bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP); |
de78a9c4 | 25 | static bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP); |
0fb1c25a CL |
26 | |
27 | static int __init parse_nosmep(char *p) | |
28 | { | |
29 | disable_kuep = true; | |
30 | pr_warn("Disabling Kernel Userspace Execution Prevention\n"); | |
31 | return 0; | |
32 | } | |
33 | early_param("nosmep", parse_nosmep); | |
34 | ||
de78a9c4 CL |
35 | static int __init parse_nosmap(char *p) |
36 | { | |
37 | disable_kuap = true; | |
38 | pr_warn("Disabling Kernel Userspace Access Protection\n"); | |
39 | return 0; | |
40 | } | |
41 | early_param("nosmap", parse_nosmap); | |
42 | ||
67d53f30 | 43 | void __ref setup_kup(void) |
69795cab | 44 | { |
0fb1c25a | 45 | setup_kuep(disable_kuep); |
de78a9c4 | 46 | setup_kuap(disable_kuap); |
69795cab | 47 | } |
9b081e10 | 48 | |
1e03c7e2 CL |
49 | #define CTOR(shift) static void ctor_##shift(void *addr) \ |
50 | { \ | |
51 | memset(addr, 0, sizeof(void *) << (shift)); \ | |
9b081e10 CL |
52 | } |
53 | ||
1e03c7e2 CL |
54 | CTOR(0); CTOR(1); CTOR(2); CTOR(3); CTOR(4); CTOR(5); CTOR(6); CTOR(7); |
55 | CTOR(8); CTOR(9); CTOR(10); CTOR(11); CTOR(12); CTOR(13); CTOR(14); CTOR(15); | |
9b081e10 | 56 | |
1e03c7e2 | 57 | static inline void (*ctor(int shift))(void *) |
9b081e10 | 58 | { |
1e03c7e2 CL |
59 | BUILD_BUG_ON(MAX_PGTABLE_INDEX_SIZE != 15); |
60 | ||
61 | switch (shift) { | |
62 | case 0: return ctor_0; | |
63 | case 1: return ctor_1; | |
64 | case 2: return ctor_2; | |
65 | case 3: return ctor_3; | |
66 | case 4: return ctor_4; | |
67 | case 5: return ctor_5; | |
68 | case 6: return ctor_6; | |
69 | case 7: return ctor_7; | |
70 | case 8: return ctor_8; | |
71 | case 9: return ctor_9; | |
72 | case 10: return ctor_10; | |
73 | case 11: return ctor_11; | |
74 | case 12: return ctor_12; | |
75 | case 13: return ctor_13; | |
76 | case 14: return ctor_14; | |
77 | case 15: return ctor_15; | |
78 | } | |
79 | return NULL; | |
9b081e10 CL |
80 | } |
81 | ||
129dd323 | 82 | struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE + 1]; |
ba9b399a | 83 | EXPORT_SYMBOL_GPL(pgtable_cache); /* used by kvm_hv module */ |
9b081e10 CL |
84 | |
85 | /* | |
86 | * Create a kmem_cache() for pagetables. This is not used for PTE | |
87 | * pages - they're linked to struct page, come from the normal free | |
88 | * pages pool and have a different entry size (see real_pte_t) to | |
89 | * everything else. Caches created by this function are used for all | |
90 | * the higher level pagetables, and for hugepage pagetables. | |
91 | */ | |
1e03c7e2 | 92 | void pgtable_cache_add(unsigned int shift) |
9b081e10 CL |
93 | { |
94 | char *name; | |
95 | unsigned long table_size = sizeof(void *) << shift; | |
96 | unsigned long align = table_size; | |
97 | ||
98 | /* When batching pgtable pointers for RCU freeing, we store | |
99 | * the index size in the low bits. Table alignment must be | |
100 | * big enough to fit it. | |
101 | * | |
102 | * Likewise, hugeapge pagetable pointers contain a (different) | |
103 | * shift value in the low bits. All tables must be aligned so | |
104 | * as to leave enough 0 bits in the address to contain it. */ | |
105 | unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1, | |
106 | HUGEPD_SHIFT_MASK + 1); | |
107 | struct kmem_cache *new; | |
108 | ||
109 | /* It would be nice if this was a BUILD_BUG_ON(), but at the | |
110 | * moment, gcc doesn't seem to recognize is_power_of_2 as a | |
111 | * constant expression, so so much for that. */ | |
112 | BUG_ON(!is_power_of_2(minalign)); | |
129dd323 | 113 | BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); |
9b081e10 CL |
114 | |
115 | if (PGT_CACHE(shift)) | |
116 | return; /* Already have a cache of this size */ | |
117 | ||
118 | align = max_t(unsigned long, align, minalign); | |
119 | name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift); | |
1e03c7e2 | 120 | new = kmem_cache_create(name, table_size, align, 0, ctor(shift)); |
bf5ca68d NP |
121 | if (!new) |
122 | panic("Could not allocate pgtable cache for order %d", shift); | |
123 | ||
9b081e10 | 124 | kfree(name); |
129dd323 | 125 | pgtable_cache[shift] = new; |
bf5ca68d | 126 | |
9b081e10 CL |
127 | pr_debug("Allocated pgtable cache for order %d\n", shift); |
128 | } | |
ba9b399a | 129 | EXPORT_SYMBOL_GPL(pgtable_cache_add); /* used by kvm_hv module */ |
9b081e10 CL |
130 | |
131 | void pgtable_cache_init(void) | |
132 | { | |
1e03c7e2 | 133 | pgtable_cache_add(PGD_INDEX_SIZE); |
9b081e10 | 134 | |
32bff4b9 | 135 | if (PMD_CACHE_INDEX) |
1e03c7e2 | 136 | pgtable_cache_add(PMD_CACHE_INDEX); |
9b081e10 CL |
137 | /* |
138 | * In all current configs, when the PUD index exists it's the | |
139 | * same size as either the pgd or pmd index except with THP enabled | |
140 | * on book3s 64 | |
141 | */ | |
32bff4b9 | 142 | if (PUD_CACHE_INDEX) |
1e03c7e2 | 143 | pgtable_cache_add(PUD_CACHE_INDEX); |
9b081e10 | 144 | } |