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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2011
4 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
5 */
6#include <linux/hugetlb.h>
7#include <linux/mm.h>
8#include <asm/cacheflush.h>
9#include <asm/facility.h>
10#include <asm/pgalloc.h>
11#include <asm/kfence.h>
12#include <asm/page.h>
13#include <asm/set_memory.h>
14
15static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
16{
17 asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],1,0"
18 : [addr] "+a" (addr) : [skey] "d" (skey));
19 return addr;
20}
21
22void __storage_key_init_range(unsigned long start, unsigned long end)
23{
24 unsigned long boundary, size;
25
26 while (start < end) {
27 if (MACHINE_HAS_EDAT1) {
28 /* set storage keys for a 1MB frame */
29 size = 1UL << 20;
30 boundary = (start + size) & ~(size - 1);
31 if (boundary <= end) {
32 do {
33 start = sske_frame(start, PAGE_DEFAULT_KEY);
34 } while (start < boundary);
35 continue;
36 }
37 }
38 page_set_storage_key(start, PAGE_DEFAULT_KEY, 1);
39 start += PAGE_SIZE;
40 }
41}
42
43#ifdef CONFIG_PROC_FS
44atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];
45
46void arch_report_meminfo(struct seq_file *m)
47{
48 seq_printf(m, "DirectMap4k: %8lu kB\n",
49 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_4K]) << 2);
50 seq_printf(m, "DirectMap1M: %8lu kB\n",
51 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_1M]) << 10);
52 seq_printf(m, "DirectMap2G: %8lu kB\n",
53 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_2G]) << 21);
54}
55#endif /* CONFIG_PROC_FS */
56
57static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
58 unsigned long dtt)
59{
60 unsigned long *table, mask;
61
62 mask = 0;
63 if (MACHINE_HAS_EDAT2) {
64 switch (dtt) {
65 case CRDTE_DTT_REGION3:
66 mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
67 break;
68 case CRDTE_DTT_SEGMENT:
69 mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
70 break;
71 case CRDTE_DTT_PAGE:
72 mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
73 break;
74 }
75 table = (unsigned long *)((unsigned long)old & mask);
76 crdte(*old, new, table, dtt, addr, S390_lowcore.kernel_asce);
77 } else if (MACHINE_HAS_IDTE) {
78 cspg(old, *old, new);
79 } else {
80 csp((unsigned int *)old + 1, *old, new);
81 }
82}
83
84static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
85 unsigned long flags)
86{
87 pte_t *ptep, new;
88
89 if (flags == SET_MEMORY_4K)
90 return 0;
91 ptep = pte_offset_kernel(pmdp, addr);
92 do {
93 new = *ptep;
94 if (pte_none(new))
95 return -EINVAL;
96 if (flags & SET_MEMORY_RO)
97 new = pte_wrprotect(new);
98 else if (flags & SET_MEMORY_RW)
99 new = pte_mkwrite(pte_mkdirty(new));
100 if (flags & SET_MEMORY_NX)
101 new = set_pte_bit(new, __pgprot(_PAGE_NOEXEC));
102 else if (flags & SET_MEMORY_X)
103 new = clear_pte_bit(new, __pgprot(_PAGE_NOEXEC));
104 pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
105 ptep++;
106 addr += PAGE_SIZE;
107 cond_resched();
108 } while (addr < end);
109 return 0;
110}
111
112static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
113{
114 unsigned long pte_addr, prot;
115 pte_t *pt_dir, *ptep;
116 pmd_t new;
117 int i, ro, nx;
118
119 pt_dir = vmem_pte_alloc();
120 if (!pt_dir)
121 return -ENOMEM;
122 pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
123 ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
124 nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
125 prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
126 if (!nx)
127 prot &= ~_PAGE_NOEXEC;
128 ptep = pt_dir;
129 for (i = 0; i < PTRS_PER_PTE; i++) {
130 set_pte(ptep, __pte(pte_addr | prot));
131 pte_addr += PAGE_SIZE;
132 ptep++;
133 }
134 new = __pmd(__pa(pt_dir) | _SEGMENT_ENTRY);
135 pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
136 update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
137 update_page_count(PG_DIRECT_MAP_1M, -1);
138 return 0;
139}
140
141static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
142 unsigned long flags)
143{
144 pmd_t new = *pmdp;
145
146 if (flags & SET_MEMORY_RO)
147 new = pmd_wrprotect(new);
148 else if (flags & SET_MEMORY_RW)
149 new = pmd_mkwrite(pmd_mkdirty(new));
150 if (flags & SET_MEMORY_NX)
151 new = set_pmd_bit(new, __pgprot(_SEGMENT_ENTRY_NOEXEC));
152 else if (flags & SET_MEMORY_X)
153 new = clear_pmd_bit(new, __pgprot(_SEGMENT_ENTRY_NOEXEC));
154 pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
155}
156
157static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
158 unsigned long flags)
159{
160 unsigned long next;
161 int need_split;
162 pmd_t *pmdp;
163 int rc = 0;
164
165 pmdp = pmd_offset(pudp, addr);
166 do {
167 if (pmd_none(*pmdp))
168 return -EINVAL;
169 next = pmd_addr_end(addr, end);
170 if (pmd_large(*pmdp)) {
171 need_split = !!(flags & SET_MEMORY_4K);
172 need_split |= !!(addr & ~PMD_MASK);
173 need_split |= !!(addr + PMD_SIZE > next);
174 if (need_split) {
175 rc = split_pmd_page(pmdp, addr);
176 if (rc)
177 return rc;
178 continue;
179 }
180 modify_pmd_page(pmdp, addr, flags);
181 } else {
182 rc = walk_pte_level(pmdp, addr, next, flags);
183 if (rc)
184 return rc;
185 }
186 pmdp++;
187 addr = next;
188 cond_resched();
189 } while (addr < end);
190 return rc;
191}
192
193static int split_pud_page(pud_t *pudp, unsigned long addr)
194{
195 unsigned long pmd_addr, prot;
196 pmd_t *pm_dir, *pmdp;
197 pud_t new;
198 int i, ro, nx;
199
200 pm_dir = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY);
201 if (!pm_dir)
202 return -ENOMEM;
203 pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
204 ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
205 nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
206 prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
207 if (!nx)
208 prot &= ~_SEGMENT_ENTRY_NOEXEC;
209 pmdp = pm_dir;
210 for (i = 0; i < PTRS_PER_PMD; i++) {
211 set_pmd(pmdp, __pmd(pmd_addr | prot));
212 pmd_addr += PMD_SIZE;
213 pmdp++;
214 }
215 new = __pud(__pa(pm_dir) | _REGION3_ENTRY);
216 pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
217 update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
218 update_page_count(PG_DIRECT_MAP_2G, -1);
219 return 0;
220}
221
222static void modify_pud_page(pud_t *pudp, unsigned long addr,
223 unsigned long flags)
224{
225 pud_t new = *pudp;
226
227 if (flags & SET_MEMORY_RO)
228 new = pud_wrprotect(new);
229 else if (flags & SET_MEMORY_RW)
230 new = pud_mkwrite(pud_mkdirty(new));
231 if (flags & SET_MEMORY_NX)
232 new = set_pud_bit(new, __pgprot(_REGION_ENTRY_NOEXEC));
233 else if (flags & SET_MEMORY_X)
234 new = clear_pud_bit(new, __pgprot(_REGION_ENTRY_NOEXEC));
235 pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
236}
237
238static int walk_pud_level(p4d_t *p4d, unsigned long addr, unsigned long end,
239 unsigned long flags)
240{
241 unsigned long next;
242 int need_split;
243 pud_t *pudp;
244 int rc = 0;
245
246 pudp = pud_offset(p4d, addr);
247 do {
248 if (pud_none(*pudp))
249 return -EINVAL;
250 next = pud_addr_end(addr, end);
251 if (pud_large(*pudp)) {
252 need_split = !!(flags & SET_MEMORY_4K);
253 need_split |= !!(addr & ~PUD_MASK);
254 need_split |= !!(addr + PUD_SIZE > next);
255 if (need_split) {
256 rc = split_pud_page(pudp, addr);
257 if (rc)
258 break;
259 continue;
260 }
261 modify_pud_page(pudp, addr, flags);
262 } else {
263 rc = walk_pmd_level(pudp, addr, next, flags);
264 }
265 pudp++;
266 addr = next;
267 cond_resched();
268 } while (addr < end && !rc);
269 return rc;
270}
271
272static int walk_p4d_level(pgd_t *pgd, unsigned long addr, unsigned long end,
273 unsigned long flags)
274{
275 unsigned long next;
276 p4d_t *p4dp;
277 int rc = 0;
278
279 p4dp = p4d_offset(pgd, addr);
280 do {
281 if (p4d_none(*p4dp))
282 return -EINVAL;
283 next = p4d_addr_end(addr, end);
284 rc = walk_pud_level(p4dp, addr, next, flags);
285 p4dp++;
286 addr = next;
287 cond_resched();
288 } while (addr < end && !rc);
289 return rc;
290}
291
292DEFINE_MUTEX(cpa_mutex);
293
294static int change_page_attr(unsigned long addr, unsigned long end,
295 unsigned long flags)
296{
297 unsigned long next;
298 int rc = -EINVAL;
299 pgd_t *pgdp;
300
301 if (addr == end)
302 return 0;
303 if (end >= MODULES_END)
304 return -EINVAL;
305 mutex_lock(&cpa_mutex);
306 pgdp = pgd_offset_k(addr);
307 do {
308 if (pgd_none(*pgdp))
309 break;
310 next = pgd_addr_end(addr, end);
311 rc = walk_p4d_level(pgdp, addr, next, flags);
312 if (rc)
313 break;
314 cond_resched();
315 } while (pgdp++, addr = next, addr < end && !rc);
316 mutex_unlock(&cpa_mutex);
317 return rc;
318}
319
320int __set_memory(unsigned long addr, int numpages, unsigned long flags)
321{
322 if (!MACHINE_HAS_NX)
323 flags &= ~(SET_MEMORY_NX | SET_MEMORY_X);
324 if (!flags)
325 return 0;
326 addr &= PAGE_MASK;
327 return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
328}
329
330#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KFENCE)
331
332static void ipte_range(pte_t *pte, unsigned long address, int nr)
333{
334 int i;
335
336 if (test_facility(13)) {
337 __ptep_ipte_range(address, nr - 1, pte, IPTE_GLOBAL);
338 return;
339 }
340 for (i = 0; i < nr; i++) {
341 __ptep_ipte(address, pte, 0, 0, IPTE_GLOBAL);
342 address += PAGE_SIZE;
343 pte++;
344 }
345}
346
347void __kernel_map_pages(struct page *page, int numpages, int enable)
348{
349 unsigned long address;
350 pte_t *ptep, pte;
351 int nr, i, j;
352
353 for (i = 0; i < numpages;) {
354 address = (unsigned long)page_to_virt(page + i);
355 ptep = virt_to_kpte(address);
356 nr = (unsigned long)ptep >> ilog2(sizeof(long));
357 nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
358 nr = min(numpages - i, nr);
359 if (enable) {
360 for (j = 0; j < nr; j++) {
361 pte = clear_pte_bit(*ptep, __pgprot(_PAGE_INVALID));
362 set_pte(ptep, pte);
363 address += PAGE_SIZE;
364 ptep++;
365 }
366 } else {
367 ipte_range(ptep, address, nr);
368 }
369 i += nr;
370 }
371}
372
373#endif /* CONFIG_DEBUG_PAGEALLOC */
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2011
4 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
5 */
6#include <linux/hugetlb.h>
7#include <linux/proc_fs.h>
8#include <linux/vmalloc.h>
9#include <linux/mm.h>
10#include <asm/cacheflush.h>
11#include <asm/facility.h>
12#include <asm/pgalloc.h>
13#include <asm/kfence.h>
14#include <asm/page.h>
15#include <asm/asm.h>
16#include <asm/set_memory.h>
17
18static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
19{
20 asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],1,0"
21 : [addr] "+a" (addr) : [skey] "d" (skey));
22 return addr;
23}
24
25void __storage_key_init_range(unsigned long start, unsigned long end)
26{
27 unsigned long boundary, size;
28
29 while (start < end) {
30 if (MACHINE_HAS_EDAT1) {
31 /* set storage keys for a 1MB frame */
32 size = 1UL << 20;
33 boundary = (start + size) & ~(size - 1);
34 if (boundary <= end) {
35 do {
36 start = sske_frame(start, PAGE_DEFAULT_KEY);
37 } while (start < boundary);
38 continue;
39 }
40 }
41 page_set_storage_key(start, PAGE_DEFAULT_KEY, 1);
42 start += PAGE_SIZE;
43 }
44}
45
46#ifdef CONFIG_PROC_FS
47atomic_long_t __bootdata_preserved(direct_pages_count[PG_DIRECT_MAP_MAX]);
48
49void arch_report_meminfo(struct seq_file *m)
50{
51 seq_printf(m, "DirectMap4k: %8lu kB\n",
52 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_4K]) << 2);
53 seq_printf(m, "DirectMap1M: %8lu kB\n",
54 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_1M]) << 10);
55 seq_printf(m, "DirectMap2G: %8lu kB\n",
56 atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_2G]) << 21);
57}
58#endif /* CONFIG_PROC_FS */
59
60static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
61 unsigned long dtt)
62{
63 unsigned long *table, mask;
64
65 mask = 0;
66 if (MACHINE_HAS_EDAT2) {
67 switch (dtt) {
68 case CRDTE_DTT_REGION3:
69 mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
70 break;
71 case CRDTE_DTT_SEGMENT:
72 mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
73 break;
74 case CRDTE_DTT_PAGE:
75 mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
76 break;
77 }
78 table = (unsigned long *)((unsigned long)old & mask);
79 crdte(*old, new, table, dtt, addr, get_lowcore()->kernel_asce.val);
80 } else if (MACHINE_HAS_IDTE) {
81 cspg(old, *old, new);
82 } else {
83 csp((unsigned int *)old + 1, *old, new);
84 }
85}
86
87static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
88 unsigned long flags)
89{
90 pte_t *ptep, new;
91
92 if (flags == SET_MEMORY_4K)
93 return 0;
94 ptep = pte_offset_kernel(pmdp, addr);
95 do {
96 new = *ptep;
97 if (pte_none(new))
98 return -EINVAL;
99 if (flags & SET_MEMORY_RO)
100 new = pte_wrprotect(new);
101 else if (flags & SET_MEMORY_RW)
102 new = pte_mkwrite_novma(pte_mkdirty(new));
103 if (flags & SET_MEMORY_NX)
104 new = set_pte_bit(new, __pgprot(_PAGE_NOEXEC));
105 else if (flags & SET_MEMORY_X)
106 new = clear_pte_bit(new, __pgprot(_PAGE_NOEXEC));
107 if (flags & SET_MEMORY_INV) {
108 new = set_pte_bit(new, __pgprot(_PAGE_INVALID));
109 } else if (flags & SET_MEMORY_DEF) {
110 new = __pte(pte_val(new) & PAGE_MASK);
111 new = set_pte_bit(new, PAGE_KERNEL);
112 if (!MACHINE_HAS_NX)
113 new = clear_pte_bit(new, __pgprot(_PAGE_NOEXEC));
114 }
115 pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
116 ptep++;
117 addr += PAGE_SIZE;
118 cond_resched();
119 } while (addr < end);
120 return 0;
121}
122
123static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
124{
125 unsigned long pte_addr, prot;
126 pte_t *pt_dir, *ptep;
127 pmd_t new;
128 int i, ro, nx;
129
130 pt_dir = vmem_pte_alloc();
131 if (!pt_dir)
132 return -ENOMEM;
133 pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
134 ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
135 nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
136 prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
137 if (!nx)
138 prot &= ~_PAGE_NOEXEC;
139 ptep = pt_dir;
140 for (i = 0; i < PTRS_PER_PTE; i++) {
141 set_pte(ptep, __pte(pte_addr | prot));
142 pte_addr += PAGE_SIZE;
143 ptep++;
144 }
145 new = __pmd(__pa(pt_dir) | _SEGMENT_ENTRY);
146 pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
147 update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
148 update_page_count(PG_DIRECT_MAP_1M, -1);
149 return 0;
150}
151
152static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
153 unsigned long flags)
154{
155 pmd_t new = *pmdp;
156
157 if (flags & SET_MEMORY_RO)
158 new = pmd_wrprotect(new);
159 else if (flags & SET_MEMORY_RW)
160 new = pmd_mkwrite_novma(pmd_mkdirty(new));
161 if (flags & SET_MEMORY_NX)
162 new = set_pmd_bit(new, __pgprot(_SEGMENT_ENTRY_NOEXEC));
163 else if (flags & SET_MEMORY_X)
164 new = clear_pmd_bit(new, __pgprot(_SEGMENT_ENTRY_NOEXEC));
165 if (flags & SET_MEMORY_INV) {
166 new = set_pmd_bit(new, __pgprot(_SEGMENT_ENTRY_INVALID));
167 } else if (flags & SET_MEMORY_DEF) {
168 new = __pmd(pmd_val(new) & PMD_MASK);
169 new = set_pmd_bit(new, SEGMENT_KERNEL);
170 if (!MACHINE_HAS_NX)
171 new = clear_pmd_bit(new, __pgprot(_SEGMENT_ENTRY_NOEXEC));
172 }
173 pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
174}
175
176static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
177 unsigned long flags)
178{
179 unsigned long next;
180 int need_split;
181 pmd_t *pmdp;
182 int rc = 0;
183
184 pmdp = pmd_offset(pudp, addr);
185 do {
186 if (pmd_none(*pmdp))
187 return -EINVAL;
188 next = pmd_addr_end(addr, end);
189 if (pmd_leaf(*pmdp)) {
190 need_split = !!(flags & SET_MEMORY_4K);
191 need_split |= !!(addr & ~PMD_MASK);
192 need_split |= !!(addr + PMD_SIZE > next);
193 if (need_split) {
194 rc = split_pmd_page(pmdp, addr);
195 if (rc)
196 return rc;
197 continue;
198 }
199 modify_pmd_page(pmdp, addr, flags);
200 } else {
201 rc = walk_pte_level(pmdp, addr, next, flags);
202 if (rc)
203 return rc;
204 }
205 pmdp++;
206 addr = next;
207 cond_resched();
208 } while (addr < end);
209 return rc;
210}
211
212static int split_pud_page(pud_t *pudp, unsigned long addr)
213{
214 unsigned long pmd_addr, prot;
215 pmd_t *pm_dir, *pmdp;
216 pud_t new;
217 int i, ro, nx;
218
219 pm_dir = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY);
220 if (!pm_dir)
221 return -ENOMEM;
222 pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
223 ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
224 nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
225 prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
226 if (!nx)
227 prot &= ~_SEGMENT_ENTRY_NOEXEC;
228 pmdp = pm_dir;
229 for (i = 0; i < PTRS_PER_PMD; i++) {
230 set_pmd(pmdp, __pmd(pmd_addr | prot));
231 pmd_addr += PMD_SIZE;
232 pmdp++;
233 }
234 new = __pud(__pa(pm_dir) | _REGION3_ENTRY);
235 pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
236 update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
237 update_page_count(PG_DIRECT_MAP_2G, -1);
238 return 0;
239}
240
241static void modify_pud_page(pud_t *pudp, unsigned long addr,
242 unsigned long flags)
243{
244 pud_t new = *pudp;
245
246 if (flags & SET_MEMORY_RO)
247 new = pud_wrprotect(new);
248 else if (flags & SET_MEMORY_RW)
249 new = pud_mkwrite(pud_mkdirty(new));
250 if (flags & SET_MEMORY_NX)
251 new = set_pud_bit(new, __pgprot(_REGION_ENTRY_NOEXEC));
252 else if (flags & SET_MEMORY_X)
253 new = clear_pud_bit(new, __pgprot(_REGION_ENTRY_NOEXEC));
254 if (flags & SET_MEMORY_INV) {
255 new = set_pud_bit(new, __pgprot(_REGION_ENTRY_INVALID));
256 } else if (flags & SET_MEMORY_DEF) {
257 new = __pud(pud_val(new) & PUD_MASK);
258 new = set_pud_bit(new, REGION3_KERNEL);
259 if (!MACHINE_HAS_NX)
260 new = clear_pud_bit(new, __pgprot(_REGION_ENTRY_NOEXEC));
261 }
262 pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
263}
264
265static int walk_pud_level(p4d_t *p4d, unsigned long addr, unsigned long end,
266 unsigned long flags)
267{
268 unsigned long next;
269 int need_split;
270 pud_t *pudp;
271 int rc = 0;
272
273 pudp = pud_offset(p4d, addr);
274 do {
275 if (pud_none(*pudp))
276 return -EINVAL;
277 next = pud_addr_end(addr, end);
278 if (pud_leaf(*pudp)) {
279 need_split = !!(flags & SET_MEMORY_4K);
280 need_split |= !!(addr & ~PUD_MASK);
281 need_split |= !!(addr + PUD_SIZE > next);
282 if (need_split) {
283 rc = split_pud_page(pudp, addr);
284 if (rc)
285 break;
286 continue;
287 }
288 modify_pud_page(pudp, addr, flags);
289 } else {
290 rc = walk_pmd_level(pudp, addr, next, flags);
291 }
292 pudp++;
293 addr = next;
294 cond_resched();
295 } while (addr < end && !rc);
296 return rc;
297}
298
299static int walk_p4d_level(pgd_t *pgd, unsigned long addr, unsigned long end,
300 unsigned long flags)
301{
302 unsigned long next;
303 p4d_t *p4dp;
304 int rc = 0;
305
306 p4dp = p4d_offset(pgd, addr);
307 do {
308 if (p4d_none(*p4dp))
309 return -EINVAL;
310 next = p4d_addr_end(addr, end);
311 rc = walk_pud_level(p4dp, addr, next, flags);
312 p4dp++;
313 addr = next;
314 cond_resched();
315 } while (addr < end && !rc);
316 return rc;
317}
318
319DEFINE_MUTEX(cpa_mutex);
320
321static int change_page_attr(unsigned long addr, unsigned long end,
322 unsigned long flags)
323{
324 unsigned long next;
325 int rc = -EINVAL;
326 pgd_t *pgdp;
327
328 pgdp = pgd_offset_k(addr);
329 do {
330 if (pgd_none(*pgdp))
331 break;
332 next = pgd_addr_end(addr, end);
333 rc = walk_p4d_level(pgdp, addr, next, flags);
334 if (rc)
335 break;
336 cond_resched();
337 } while (pgdp++, addr = next, addr < end && !rc);
338 return rc;
339}
340
341static int change_page_attr_alias(unsigned long addr, unsigned long end,
342 unsigned long flags)
343{
344 unsigned long alias, offset, va_start, va_end;
345 struct vm_struct *area;
346 int rc = 0;
347
348 /*
349 * Changes to read-only permissions on kernel VA mappings are also
350 * applied to the kernel direct mapping. Execute permissions are
351 * intentionally not transferred to keep all allocated pages within
352 * the direct mapping non-executable.
353 */
354 flags &= SET_MEMORY_RO | SET_MEMORY_RW;
355 if (!flags)
356 return 0;
357 area = NULL;
358 while (addr < end) {
359 if (!area)
360 area = find_vm_area((void *)addr);
361 if (!area || !(area->flags & VM_ALLOC))
362 return 0;
363 va_start = (unsigned long)area->addr;
364 va_end = va_start + area->nr_pages * PAGE_SIZE;
365 offset = (addr - va_start) >> PAGE_SHIFT;
366 alias = (unsigned long)page_address(area->pages[offset]);
367 rc = change_page_attr(alias, alias + PAGE_SIZE, flags);
368 if (rc)
369 break;
370 addr += PAGE_SIZE;
371 if (addr >= va_end)
372 area = NULL;
373 }
374 return rc;
375}
376
377int __set_memory(unsigned long addr, unsigned long numpages, unsigned long flags)
378{
379 unsigned long end;
380 int rc;
381
382 if (!MACHINE_HAS_NX)
383 flags &= ~(SET_MEMORY_NX | SET_MEMORY_X);
384 if (!flags)
385 return 0;
386 if (!numpages)
387 return 0;
388 addr &= PAGE_MASK;
389 end = addr + numpages * PAGE_SIZE;
390 mutex_lock(&cpa_mutex);
391 rc = change_page_attr(addr, end, flags);
392 if (rc)
393 goto out;
394 rc = change_page_attr_alias(addr, end, flags);
395out:
396 mutex_unlock(&cpa_mutex);
397 return rc;
398}
399
400int set_direct_map_invalid_noflush(struct page *page)
401{
402 return __set_memory((unsigned long)page_to_virt(page), 1, SET_MEMORY_INV);
403}
404
405int set_direct_map_default_noflush(struct page *page)
406{
407 return __set_memory((unsigned long)page_to_virt(page), 1, SET_MEMORY_DEF);
408}
409
410int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid)
411{
412 unsigned long flags;
413
414 if (valid)
415 flags = SET_MEMORY_DEF;
416 else
417 flags = SET_MEMORY_INV;
418
419 return __set_memory((unsigned long)page_to_virt(page), nr, flags);
420}
421
422bool kernel_page_present(struct page *page)
423{
424 unsigned long addr;
425 unsigned int cc;
426
427 addr = (unsigned long)page_address(page);
428 asm volatile(
429 " lra %[addr],0(%[addr])\n"
430 CC_IPM(cc)
431 : CC_OUT(cc, cc), [addr] "+a" (addr)
432 :
433 : CC_CLOBBER);
434 return CC_TRANSFORM(cc) == 0;
435}
436
437#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KFENCE)
438
439static void ipte_range(pte_t *pte, unsigned long address, int nr)
440{
441 int i;
442
443 if (test_facility(13)) {
444 __ptep_ipte_range(address, nr - 1, pte, IPTE_GLOBAL);
445 return;
446 }
447 for (i = 0; i < nr; i++) {
448 __ptep_ipte(address, pte, 0, 0, IPTE_GLOBAL);
449 address += PAGE_SIZE;
450 pte++;
451 }
452}
453
454void __kernel_map_pages(struct page *page, int numpages, int enable)
455{
456 unsigned long address;
457 pte_t *ptep, pte;
458 int nr, i, j;
459
460 for (i = 0; i < numpages;) {
461 address = (unsigned long)page_to_virt(page + i);
462 ptep = virt_to_kpte(address);
463 nr = (unsigned long)ptep >> ilog2(sizeof(long));
464 nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
465 nr = min(numpages - i, nr);
466 if (enable) {
467 for (j = 0; j < nr; j++) {
468 pte = clear_pte_bit(*ptep, __pgprot(_PAGE_INVALID));
469 set_pte(ptep, pte);
470 address += PAGE_SIZE;
471 ptep++;
472 }
473 } else {
474 ipte_range(ptep, address, nr);
475 }
476 i += nr;
477 }
478}
479
480#endif /* CONFIG_DEBUG_PAGEALLOC */