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1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
2 | #ifndef _ASM_X86_PGTABLE_H | |
3 | #define _ASM_X86_PGTABLE_H | |
4 | ||
5 | #include <linux/mem_encrypt.h> | |
6 | #include <asm/page.h> | |
7 | #include <asm/pgtable_types.h> | |
8 | ||
9 | /* | |
10 | * Macro to mark a page protection value as UC- | |
11 | */ | |
12 | #define pgprot_noncached(prot) \ | |
13 | ((boot_cpu_data.x86 > 3) \ | |
14 | ? (__pgprot(pgprot_val(prot) | \ | |
15 | cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \ | |
16 | : (prot)) | |
17 | ||
18 | /* | |
19 | * Macros to add or remove encryption attribute | |
20 | */ | |
21 | #define pgprot_encrypted(prot) __pgprot(__sme_set(pgprot_val(prot))) | |
22 | #define pgprot_decrypted(prot) __pgprot(__sme_clr(pgprot_val(prot))) | |
23 | ||
24 | #ifndef __ASSEMBLY__ | |
25 | #include <asm/x86_init.h> | |
26 | ||
27 | extern pgd_t early_top_pgt[PTRS_PER_PGD]; | |
28 | int __init __early_make_pgtable(unsigned long address, pmdval_t pmd); | |
29 | ||
30 | void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd); | |
31 | void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user); | |
32 | void ptdump_walk_pgd_level_checkwx(void); | |
33 | ||
34 | #ifdef CONFIG_DEBUG_WX | |
35 | #define debug_checkwx() ptdump_walk_pgd_level_checkwx() | |
36 | #else | |
37 | #define debug_checkwx() do { } while (0) | |
38 | #endif | |
39 | ||
40 | /* | |
41 | * ZERO_PAGE is a global shared page that is always zero: used | |
42 | * for zero-mapped memory areas etc.. | |
43 | */ | |
44 | extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] | |
45 | __visible; | |
46 | #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) | |
47 | ||
48 | extern spinlock_t pgd_lock; | |
49 | extern struct list_head pgd_list; | |
50 | ||
51 | extern struct mm_struct *pgd_page_get_mm(struct page *page); | |
52 | ||
53 | extern pmdval_t early_pmd_flags; | |
54 | ||
55 | #ifdef CONFIG_PARAVIRT | |
56 | #include <asm/paravirt.h> | |
57 | #else /* !CONFIG_PARAVIRT */ | |
58 | #define set_pte(ptep, pte) native_set_pte(ptep, pte) | |
59 | #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte) | |
60 | ||
61 | #define set_pte_atomic(ptep, pte) \ | |
62 | native_set_pte_atomic(ptep, pte) | |
63 | ||
64 | #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd) | |
65 | ||
66 | #ifndef __PAGETABLE_P4D_FOLDED | |
67 | #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd) | |
68 | #define pgd_clear(pgd) native_pgd_clear(pgd) | |
69 | #endif | |
70 | ||
71 | #ifndef set_p4d | |
72 | # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d) | |
73 | #endif | |
74 | ||
75 | #ifndef __PAGETABLE_PUD_FOLDED | |
76 | #define p4d_clear(p4d) native_p4d_clear(p4d) | |
77 | #endif | |
78 | ||
79 | #ifndef set_pud | |
80 | # define set_pud(pudp, pud) native_set_pud(pudp, pud) | |
81 | #endif | |
82 | ||
83 | #ifndef __PAGETABLE_PUD_FOLDED | |
84 | #define pud_clear(pud) native_pud_clear(pud) | |
85 | #endif | |
86 | ||
87 | #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep) | |
88 | #define pmd_clear(pmd) native_pmd_clear(pmd) | |
89 | ||
90 | #define pgd_val(x) native_pgd_val(x) | |
91 | #define __pgd(x) native_make_pgd(x) | |
92 | ||
93 | #ifndef __PAGETABLE_P4D_FOLDED | |
94 | #define p4d_val(x) native_p4d_val(x) | |
95 | #define __p4d(x) native_make_p4d(x) | |
96 | #endif | |
97 | ||
98 | #ifndef __PAGETABLE_PUD_FOLDED | |
99 | #define pud_val(x) native_pud_val(x) | |
100 | #define __pud(x) native_make_pud(x) | |
101 | #endif | |
102 | ||
103 | #ifndef __PAGETABLE_PMD_FOLDED | |
104 | #define pmd_val(x) native_pmd_val(x) | |
105 | #define __pmd(x) native_make_pmd(x) | |
106 | #endif | |
107 | ||
108 | #define pte_val(x) native_pte_val(x) | |
109 | #define __pte(x) native_make_pte(x) | |
110 | ||
111 | #define arch_end_context_switch(prev) do {} while(0) | |
112 | ||
113 | #endif /* CONFIG_PARAVIRT */ | |
114 | ||
115 | /* | |
116 | * The following only work if pte_present() is true. | |
117 | * Undefined behaviour if not.. | |
118 | */ | |
119 | static inline int pte_dirty(pte_t pte) | |
120 | { | |
121 | return pte_flags(pte) & _PAGE_DIRTY; | |
122 | } | |
123 | ||
124 | ||
125 | static inline u32 read_pkru(void) | |
126 | { | |
127 | if (boot_cpu_has(X86_FEATURE_OSPKE)) | |
128 | return __read_pkru(); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static inline void write_pkru(u32 pkru) | |
133 | { | |
134 | if (boot_cpu_has(X86_FEATURE_OSPKE)) | |
135 | __write_pkru(pkru); | |
136 | } | |
137 | ||
138 | static inline int pte_young(pte_t pte) | |
139 | { | |
140 | return pte_flags(pte) & _PAGE_ACCESSED; | |
141 | } | |
142 | ||
143 | static inline int pmd_dirty(pmd_t pmd) | |
144 | { | |
145 | return pmd_flags(pmd) & _PAGE_DIRTY; | |
146 | } | |
147 | ||
148 | static inline int pmd_young(pmd_t pmd) | |
149 | { | |
150 | return pmd_flags(pmd) & _PAGE_ACCESSED; | |
151 | } | |
152 | ||
153 | static inline int pud_dirty(pud_t pud) | |
154 | { | |
155 | return pud_flags(pud) & _PAGE_DIRTY; | |
156 | } | |
157 | ||
158 | static inline int pud_young(pud_t pud) | |
159 | { | |
160 | return pud_flags(pud) & _PAGE_ACCESSED; | |
161 | } | |
162 | ||
163 | static inline int pte_write(pte_t pte) | |
164 | { | |
165 | return pte_flags(pte) & _PAGE_RW; | |
166 | } | |
167 | ||
168 | static inline int pte_huge(pte_t pte) | |
169 | { | |
170 | return pte_flags(pte) & _PAGE_PSE; | |
171 | } | |
172 | ||
173 | static inline int pte_global(pte_t pte) | |
174 | { | |
175 | return pte_flags(pte) & _PAGE_GLOBAL; | |
176 | } | |
177 | ||
178 | static inline int pte_exec(pte_t pte) | |
179 | { | |
180 | return !(pte_flags(pte) & _PAGE_NX); | |
181 | } | |
182 | ||
183 | static inline int pte_special(pte_t pte) | |
184 | { | |
185 | return pte_flags(pte) & _PAGE_SPECIAL; | |
186 | } | |
187 | ||
188 | static inline unsigned long pte_pfn(pte_t pte) | |
189 | { | |
190 | return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT; | |
191 | } | |
192 | ||
193 | static inline unsigned long pmd_pfn(pmd_t pmd) | |
194 | { | |
195 | return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT; | |
196 | } | |
197 | ||
198 | static inline unsigned long pud_pfn(pud_t pud) | |
199 | { | |
200 | return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT; | |
201 | } | |
202 | ||
203 | static inline unsigned long p4d_pfn(p4d_t p4d) | |
204 | { | |
205 | return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT; | |
206 | } | |
207 | ||
208 | static inline unsigned long pgd_pfn(pgd_t pgd) | |
209 | { | |
210 | return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT; | |
211 | } | |
212 | ||
213 | static inline int p4d_large(p4d_t p4d) | |
214 | { | |
215 | /* No 512 GiB pages yet */ | |
216 | return 0; | |
217 | } | |
218 | ||
219 | #define pte_page(pte) pfn_to_page(pte_pfn(pte)) | |
220 | ||
221 | static inline int pmd_large(pmd_t pte) | |
222 | { | |
223 | return pmd_flags(pte) & _PAGE_PSE; | |
224 | } | |
225 | ||
226 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
227 | static inline int pmd_trans_huge(pmd_t pmd) | |
228 | { | |
229 | return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE; | |
230 | } | |
231 | ||
232 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
233 | static inline int pud_trans_huge(pud_t pud) | |
234 | { | |
235 | return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE; | |
236 | } | |
237 | #endif | |
238 | ||
239 | #define has_transparent_hugepage has_transparent_hugepage | |
240 | static inline int has_transparent_hugepage(void) | |
241 | { | |
242 | return boot_cpu_has(X86_FEATURE_PSE); | |
243 | } | |
244 | ||
245 | #ifdef __HAVE_ARCH_PTE_DEVMAP | |
246 | static inline int pmd_devmap(pmd_t pmd) | |
247 | { | |
248 | return !!(pmd_val(pmd) & _PAGE_DEVMAP); | |
249 | } | |
250 | ||
251 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
252 | static inline int pud_devmap(pud_t pud) | |
253 | { | |
254 | return !!(pud_val(pud) & _PAGE_DEVMAP); | |
255 | } | |
256 | #else | |
257 | static inline int pud_devmap(pud_t pud) | |
258 | { | |
259 | return 0; | |
260 | } | |
261 | #endif | |
262 | ||
263 | static inline int pgd_devmap(pgd_t pgd) | |
264 | { | |
265 | return 0; | |
266 | } | |
267 | #endif | |
268 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
269 | ||
270 | static inline pte_t pte_set_flags(pte_t pte, pteval_t set) | |
271 | { | |
272 | pteval_t v = native_pte_val(pte); | |
273 | ||
274 | return native_make_pte(v | set); | |
275 | } | |
276 | ||
277 | static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear) | |
278 | { | |
279 | pteval_t v = native_pte_val(pte); | |
280 | ||
281 | return native_make_pte(v & ~clear); | |
282 | } | |
283 | ||
284 | static inline pte_t pte_mkclean(pte_t pte) | |
285 | { | |
286 | return pte_clear_flags(pte, _PAGE_DIRTY); | |
287 | } | |
288 | ||
289 | static inline pte_t pte_mkold(pte_t pte) | |
290 | { | |
291 | return pte_clear_flags(pte, _PAGE_ACCESSED); | |
292 | } | |
293 | ||
294 | static inline pte_t pte_wrprotect(pte_t pte) | |
295 | { | |
296 | return pte_clear_flags(pte, _PAGE_RW); | |
297 | } | |
298 | ||
299 | static inline pte_t pte_mkexec(pte_t pte) | |
300 | { | |
301 | return pte_clear_flags(pte, _PAGE_NX); | |
302 | } | |
303 | ||
304 | static inline pte_t pte_mkdirty(pte_t pte) | |
305 | { | |
306 | return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); | |
307 | } | |
308 | ||
309 | static inline pte_t pte_mkyoung(pte_t pte) | |
310 | { | |
311 | return pte_set_flags(pte, _PAGE_ACCESSED); | |
312 | } | |
313 | ||
314 | static inline pte_t pte_mkwrite(pte_t pte) | |
315 | { | |
316 | return pte_set_flags(pte, _PAGE_RW); | |
317 | } | |
318 | ||
319 | static inline pte_t pte_mkhuge(pte_t pte) | |
320 | { | |
321 | return pte_set_flags(pte, _PAGE_PSE); | |
322 | } | |
323 | ||
324 | static inline pte_t pte_clrhuge(pte_t pte) | |
325 | { | |
326 | return pte_clear_flags(pte, _PAGE_PSE); | |
327 | } | |
328 | ||
329 | static inline pte_t pte_mkglobal(pte_t pte) | |
330 | { | |
331 | return pte_set_flags(pte, _PAGE_GLOBAL); | |
332 | } | |
333 | ||
334 | static inline pte_t pte_clrglobal(pte_t pte) | |
335 | { | |
336 | return pte_clear_flags(pte, _PAGE_GLOBAL); | |
337 | } | |
338 | ||
339 | static inline pte_t pte_mkspecial(pte_t pte) | |
340 | { | |
341 | return pte_set_flags(pte, _PAGE_SPECIAL); | |
342 | } | |
343 | ||
344 | static inline pte_t pte_mkdevmap(pte_t pte) | |
345 | { | |
346 | return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP); | |
347 | } | |
348 | ||
349 | static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set) | |
350 | { | |
351 | pmdval_t v = native_pmd_val(pmd); | |
352 | ||
353 | return native_make_pmd(v | set); | |
354 | } | |
355 | ||
356 | static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear) | |
357 | { | |
358 | pmdval_t v = native_pmd_val(pmd); | |
359 | ||
360 | return native_make_pmd(v & ~clear); | |
361 | } | |
362 | ||
363 | static inline pmd_t pmd_mkold(pmd_t pmd) | |
364 | { | |
365 | return pmd_clear_flags(pmd, _PAGE_ACCESSED); | |
366 | } | |
367 | ||
368 | static inline pmd_t pmd_mkclean(pmd_t pmd) | |
369 | { | |
370 | return pmd_clear_flags(pmd, _PAGE_DIRTY); | |
371 | } | |
372 | ||
373 | static inline pmd_t pmd_wrprotect(pmd_t pmd) | |
374 | { | |
375 | return pmd_clear_flags(pmd, _PAGE_RW); | |
376 | } | |
377 | ||
378 | static inline pmd_t pmd_mkdirty(pmd_t pmd) | |
379 | { | |
380 | return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); | |
381 | } | |
382 | ||
383 | static inline pmd_t pmd_mkdevmap(pmd_t pmd) | |
384 | { | |
385 | return pmd_set_flags(pmd, _PAGE_DEVMAP); | |
386 | } | |
387 | ||
388 | static inline pmd_t pmd_mkhuge(pmd_t pmd) | |
389 | { | |
390 | return pmd_set_flags(pmd, _PAGE_PSE); | |
391 | } | |
392 | ||
393 | static inline pmd_t pmd_mkyoung(pmd_t pmd) | |
394 | { | |
395 | return pmd_set_flags(pmd, _PAGE_ACCESSED); | |
396 | } | |
397 | ||
398 | static inline pmd_t pmd_mkwrite(pmd_t pmd) | |
399 | { | |
400 | return pmd_set_flags(pmd, _PAGE_RW); | |
401 | } | |
402 | ||
403 | static inline pmd_t pmd_mknotpresent(pmd_t pmd) | |
404 | { | |
405 | return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE); | |
406 | } | |
407 | ||
408 | static inline pud_t pud_set_flags(pud_t pud, pudval_t set) | |
409 | { | |
410 | pudval_t v = native_pud_val(pud); | |
411 | ||
412 | return native_make_pud(v | set); | |
413 | } | |
414 | ||
415 | static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear) | |
416 | { | |
417 | pudval_t v = native_pud_val(pud); | |
418 | ||
419 | return native_make_pud(v & ~clear); | |
420 | } | |
421 | ||
422 | static inline pud_t pud_mkold(pud_t pud) | |
423 | { | |
424 | return pud_clear_flags(pud, _PAGE_ACCESSED); | |
425 | } | |
426 | ||
427 | static inline pud_t pud_mkclean(pud_t pud) | |
428 | { | |
429 | return pud_clear_flags(pud, _PAGE_DIRTY); | |
430 | } | |
431 | ||
432 | static inline pud_t pud_wrprotect(pud_t pud) | |
433 | { | |
434 | return pud_clear_flags(pud, _PAGE_RW); | |
435 | } | |
436 | ||
437 | static inline pud_t pud_mkdirty(pud_t pud) | |
438 | { | |
439 | return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); | |
440 | } | |
441 | ||
442 | static inline pud_t pud_mkdevmap(pud_t pud) | |
443 | { | |
444 | return pud_set_flags(pud, _PAGE_DEVMAP); | |
445 | } | |
446 | ||
447 | static inline pud_t pud_mkhuge(pud_t pud) | |
448 | { | |
449 | return pud_set_flags(pud, _PAGE_PSE); | |
450 | } | |
451 | ||
452 | static inline pud_t pud_mkyoung(pud_t pud) | |
453 | { | |
454 | return pud_set_flags(pud, _PAGE_ACCESSED); | |
455 | } | |
456 | ||
457 | static inline pud_t pud_mkwrite(pud_t pud) | |
458 | { | |
459 | return pud_set_flags(pud, _PAGE_RW); | |
460 | } | |
461 | ||
462 | static inline pud_t pud_mknotpresent(pud_t pud) | |
463 | { | |
464 | return pud_clear_flags(pud, _PAGE_PRESENT | _PAGE_PROTNONE); | |
465 | } | |
466 | ||
467 | #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY | |
468 | static inline int pte_soft_dirty(pte_t pte) | |
469 | { | |
470 | return pte_flags(pte) & _PAGE_SOFT_DIRTY; | |
471 | } | |
472 | ||
473 | static inline int pmd_soft_dirty(pmd_t pmd) | |
474 | { | |
475 | return pmd_flags(pmd) & _PAGE_SOFT_DIRTY; | |
476 | } | |
477 | ||
478 | static inline int pud_soft_dirty(pud_t pud) | |
479 | { | |
480 | return pud_flags(pud) & _PAGE_SOFT_DIRTY; | |
481 | } | |
482 | ||
483 | static inline pte_t pte_mksoft_dirty(pte_t pte) | |
484 | { | |
485 | return pte_set_flags(pte, _PAGE_SOFT_DIRTY); | |
486 | } | |
487 | ||
488 | static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) | |
489 | { | |
490 | return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY); | |
491 | } | |
492 | ||
493 | static inline pud_t pud_mksoft_dirty(pud_t pud) | |
494 | { | |
495 | return pud_set_flags(pud, _PAGE_SOFT_DIRTY); | |
496 | } | |
497 | ||
498 | static inline pte_t pte_clear_soft_dirty(pte_t pte) | |
499 | { | |
500 | return pte_clear_flags(pte, _PAGE_SOFT_DIRTY); | |
501 | } | |
502 | ||
503 | static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) | |
504 | { | |
505 | return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY); | |
506 | } | |
507 | ||
508 | static inline pud_t pud_clear_soft_dirty(pud_t pud) | |
509 | { | |
510 | return pud_clear_flags(pud, _PAGE_SOFT_DIRTY); | |
511 | } | |
512 | ||
513 | #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ | |
514 | ||
515 | /* | |
516 | * Mask out unsupported bits in a present pgprot. Non-present pgprots | |
517 | * can use those bits for other purposes, so leave them be. | |
518 | */ | |
519 | static inline pgprotval_t massage_pgprot(pgprot_t pgprot) | |
520 | { | |
521 | pgprotval_t protval = pgprot_val(pgprot); | |
522 | ||
523 | if (protval & _PAGE_PRESENT) | |
524 | protval &= __supported_pte_mask; | |
525 | ||
526 | return protval; | |
527 | } | |
528 | ||
529 | static inline pgprotval_t check_pgprot(pgprot_t pgprot) | |
530 | { | |
531 | pgprotval_t massaged_val = massage_pgprot(pgprot); | |
532 | ||
533 | /* mmdebug.h can not be included here because of dependencies */ | |
534 | #ifdef CONFIG_DEBUG_VM | |
535 | WARN_ONCE(pgprot_val(pgprot) != massaged_val, | |
536 | "attempted to set unsupported pgprot: %016llx " | |
537 | "bits: %016llx supported: %016llx\n", | |
538 | (u64)pgprot_val(pgprot), | |
539 | (u64)pgprot_val(pgprot) ^ massaged_val, | |
540 | (u64)__supported_pte_mask); | |
541 | #endif | |
542 | ||
543 | return massaged_val; | |
544 | } | |
545 | ||
546 | static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
547 | { | |
548 | return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) | | |
549 | check_pgprot(pgprot)); | |
550 | } | |
551 | ||
552 | static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) | |
553 | { | |
554 | return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) | | |
555 | check_pgprot(pgprot)); | |
556 | } | |
557 | ||
558 | static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot) | |
559 | { | |
560 | return __pud(((phys_addr_t)page_nr << PAGE_SHIFT) | | |
561 | check_pgprot(pgprot)); | |
562 | } | |
563 | ||
564 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
565 | { | |
566 | pteval_t val = pte_val(pte); | |
567 | ||
568 | /* | |
569 | * Chop off the NX bit (if present), and add the NX portion of | |
570 | * the newprot (if present): | |
571 | */ | |
572 | val &= _PAGE_CHG_MASK; | |
573 | val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK; | |
574 | ||
575 | return __pte(val); | |
576 | } | |
577 | ||
578 | static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) | |
579 | { | |
580 | pmdval_t val = pmd_val(pmd); | |
581 | ||
582 | val &= _HPAGE_CHG_MASK; | |
583 | val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK; | |
584 | ||
585 | return __pmd(val); | |
586 | } | |
587 | ||
588 | /* mprotect needs to preserve PAT bits when updating vm_page_prot */ | |
589 | #define pgprot_modify pgprot_modify | |
590 | static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) | |
591 | { | |
592 | pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK; | |
593 | pgprotval_t addbits = pgprot_val(newprot); | |
594 | return __pgprot(preservebits | addbits); | |
595 | } | |
596 | ||
597 | #define pte_pgprot(x) __pgprot(pte_flags(x)) | |
598 | #define pmd_pgprot(x) __pgprot(pmd_flags(x)) | |
599 | #define pud_pgprot(x) __pgprot(pud_flags(x)) | |
600 | #define p4d_pgprot(x) __pgprot(p4d_flags(x)) | |
601 | ||
602 | #define canon_pgprot(p) __pgprot(massage_pgprot(p)) | |
603 | ||
604 | static inline int is_new_memtype_allowed(u64 paddr, unsigned long size, | |
605 | enum page_cache_mode pcm, | |
606 | enum page_cache_mode new_pcm) | |
607 | { | |
608 | /* | |
609 | * PAT type is always WB for untracked ranges, so no need to check. | |
610 | */ | |
611 | if (x86_platform.is_untracked_pat_range(paddr, paddr + size)) | |
612 | return 1; | |
613 | ||
614 | /* | |
615 | * Certain new memtypes are not allowed with certain | |
616 | * requested memtype: | |
617 | * - request is uncached, return cannot be write-back | |
618 | * - request is write-combine, return cannot be write-back | |
619 | * - request is write-through, return cannot be write-back | |
620 | * - request is write-through, return cannot be write-combine | |
621 | */ | |
622 | if ((pcm == _PAGE_CACHE_MODE_UC_MINUS && | |
623 | new_pcm == _PAGE_CACHE_MODE_WB) || | |
624 | (pcm == _PAGE_CACHE_MODE_WC && | |
625 | new_pcm == _PAGE_CACHE_MODE_WB) || | |
626 | (pcm == _PAGE_CACHE_MODE_WT && | |
627 | new_pcm == _PAGE_CACHE_MODE_WB) || | |
628 | (pcm == _PAGE_CACHE_MODE_WT && | |
629 | new_pcm == _PAGE_CACHE_MODE_WC)) { | |
630 | return 0; | |
631 | } | |
632 | ||
633 | return 1; | |
634 | } | |
635 | ||
636 | pmd_t *populate_extra_pmd(unsigned long vaddr); | |
637 | pte_t *populate_extra_pte(unsigned long vaddr); | |
638 | #endif /* __ASSEMBLY__ */ | |
639 | ||
640 | #ifdef CONFIG_X86_32 | |
641 | # include <asm/pgtable_32.h> | |
642 | #else | |
643 | # include <asm/pgtable_64.h> | |
644 | #endif | |
645 | ||
646 | #ifndef __ASSEMBLY__ | |
647 | #include <linux/mm_types.h> | |
648 | #include <linux/mmdebug.h> | |
649 | #include <linux/log2.h> | |
650 | #include <asm/fixmap.h> | |
651 | ||
652 | static inline int pte_none(pte_t pte) | |
653 | { | |
654 | return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK)); | |
655 | } | |
656 | ||
657 | #define __HAVE_ARCH_PTE_SAME | |
658 | static inline int pte_same(pte_t a, pte_t b) | |
659 | { | |
660 | return a.pte == b.pte; | |
661 | } | |
662 | ||
663 | static inline int pte_present(pte_t a) | |
664 | { | |
665 | return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE); | |
666 | } | |
667 | ||
668 | #ifdef __HAVE_ARCH_PTE_DEVMAP | |
669 | static inline int pte_devmap(pte_t a) | |
670 | { | |
671 | return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP; | |
672 | } | |
673 | #endif | |
674 | ||
675 | #define pte_accessible pte_accessible | |
676 | static inline bool pte_accessible(struct mm_struct *mm, pte_t a) | |
677 | { | |
678 | if (pte_flags(a) & _PAGE_PRESENT) | |
679 | return true; | |
680 | ||
681 | if ((pte_flags(a) & _PAGE_PROTNONE) && | |
682 | mm_tlb_flush_pending(mm)) | |
683 | return true; | |
684 | ||
685 | return false; | |
686 | } | |
687 | ||
688 | static inline int pmd_present(pmd_t pmd) | |
689 | { | |
690 | /* | |
691 | * Checking for _PAGE_PSE is needed too because | |
692 | * split_huge_page will temporarily clear the present bit (but | |
693 | * the _PAGE_PSE flag will remain set at all times while the | |
694 | * _PAGE_PRESENT bit is clear). | |
695 | */ | |
696 | return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE); | |
697 | } | |
698 | ||
699 | #ifdef CONFIG_NUMA_BALANCING | |
700 | /* | |
701 | * These work without NUMA balancing but the kernel does not care. See the | |
702 | * comment in include/asm-generic/pgtable.h | |
703 | */ | |
704 | static inline int pte_protnone(pte_t pte) | |
705 | { | |
706 | return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT)) | |
707 | == _PAGE_PROTNONE; | |
708 | } | |
709 | ||
710 | static inline int pmd_protnone(pmd_t pmd) | |
711 | { | |
712 | return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT)) | |
713 | == _PAGE_PROTNONE; | |
714 | } | |
715 | #endif /* CONFIG_NUMA_BALANCING */ | |
716 | ||
717 | static inline int pmd_none(pmd_t pmd) | |
718 | { | |
719 | /* Only check low word on 32-bit platforms, since it might be | |
720 | out of sync with upper half. */ | |
721 | unsigned long val = native_pmd_val(pmd); | |
722 | return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0; | |
723 | } | |
724 | ||
725 | static inline unsigned long pmd_page_vaddr(pmd_t pmd) | |
726 | { | |
727 | return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd)); | |
728 | } | |
729 | ||
730 | /* | |
731 | * Currently stuck as a macro due to indirect forward reference to | |
732 | * linux/mmzone.h's __section_mem_map_addr() definition: | |
733 | */ | |
734 | #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd)) | |
735 | ||
736 | /* | |
737 | * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] | |
738 | * | |
739 | * this macro returns the index of the entry in the pmd page which would | |
740 | * control the given virtual address | |
741 | */ | |
742 | static inline unsigned long pmd_index(unsigned long address) | |
743 | { | |
744 | return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); | |
745 | } | |
746 | ||
747 | /* | |
748 | * Conversion functions: convert a page and protection to a page entry, | |
749 | * and a page entry and page directory to the page they refer to. | |
750 | * | |
751 | * (Currently stuck as a macro because of indirect forward reference | |
752 | * to linux/mm.h:page_to_nid()) | |
753 | */ | |
754 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) | |
755 | ||
756 | /* | |
757 | * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] | |
758 | * | |
759 | * this function returns the index of the entry in the pte page which would | |
760 | * control the given virtual address | |
761 | */ | |
762 | static inline unsigned long pte_index(unsigned long address) | |
763 | { | |
764 | return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1); | |
765 | } | |
766 | ||
767 | static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address) | |
768 | { | |
769 | return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address); | |
770 | } | |
771 | ||
772 | static inline int pmd_bad(pmd_t pmd) | |
773 | { | |
774 | return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE; | |
775 | } | |
776 | ||
777 | static inline unsigned long pages_to_mb(unsigned long npg) | |
778 | { | |
779 | return npg >> (20 - PAGE_SHIFT); | |
780 | } | |
781 | ||
782 | #if CONFIG_PGTABLE_LEVELS > 2 | |
783 | static inline int pud_none(pud_t pud) | |
784 | { | |
785 | return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0; | |
786 | } | |
787 | ||
788 | static inline int pud_present(pud_t pud) | |
789 | { | |
790 | return pud_flags(pud) & _PAGE_PRESENT; | |
791 | } | |
792 | ||
793 | static inline unsigned long pud_page_vaddr(pud_t pud) | |
794 | { | |
795 | return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud)); | |
796 | } | |
797 | ||
798 | /* | |
799 | * Currently stuck as a macro due to indirect forward reference to | |
800 | * linux/mmzone.h's __section_mem_map_addr() definition: | |
801 | */ | |
802 | #define pud_page(pud) pfn_to_page(pud_pfn(pud)) | |
803 | ||
804 | /* Find an entry in the second-level page table.. */ | |
805 | static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) | |
806 | { | |
807 | return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); | |
808 | } | |
809 | ||
810 | static inline int pud_large(pud_t pud) | |
811 | { | |
812 | return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) == | |
813 | (_PAGE_PSE | _PAGE_PRESENT); | |
814 | } | |
815 | ||
816 | static inline int pud_bad(pud_t pud) | |
817 | { | |
818 | return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0; | |
819 | } | |
820 | #else | |
821 | static inline int pud_large(pud_t pud) | |
822 | { | |
823 | return 0; | |
824 | } | |
825 | #endif /* CONFIG_PGTABLE_LEVELS > 2 */ | |
826 | ||
827 | static inline unsigned long pud_index(unsigned long address) | |
828 | { | |
829 | return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1); | |
830 | } | |
831 | ||
832 | #if CONFIG_PGTABLE_LEVELS > 3 | |
833 | static inline int p4d_none(p4d_t p4d) | |
834 | { | |
835 | return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0; | |
836 | } | |
837 | ||
838 | static inline int p4d_present(p4d_t p4d) | |
839 | { | |
840 | return p4d_flags(p4d) & _PAGE_PRESENT; | |
841 | } | |
842 | ||
843 | static inline unsigned long p4d_page_vaddr(p4d_t p4d) | |
844 | { | |
845 | return (unsigned long)__va(p4d_val(p4d) & p4d_pfn_mask(p4d)); | |
846 | } | |
847 | ||
848 | /* | |
849 | * Currently stuck as a macro due to indirect forward reference to | |
850 | * linux/mmzone.h's __section_mem_map_addr() definition: | |
851 | */ | |
852 | #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d)) | |
853 | ||
854 | /* Find an entry in the third-level page table.. */ | |
855 | static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) | |
856 | { | |
857 | return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address); | |
858 | } | |
859 | ||
860 | static inline int p4d_bad(p4d_t p4d) | |
861 | { | |
862 | unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER; | |
863 | ||
864 | if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) | |
865 | ignore_flags |= _PAGE_NX; | |
866 | ||
867 | return (p4d_flags(p4d) & ~ignore_flags) != 0; | |
868 | } | |
869 | #endif /* CONFIG_PGTABLE_LEVELS > 3 */ | |
870 | ||
871 | static inline unsigned long p4d_index(unsigned long address) | |
872 | { | |
873 | return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1); | |
874 | } | |
875 | ||
876 | #if CONFIG_PGTABLE_LEVELS > 4 | |
877 | static inline int pgd_present(pgd_t pgd) | |
878 | { | |
879 | return pgd_flags(pgd) & _PAGE_PRESENT; | |
880 | } | |
881 | ||
882 | static inline unsigned long pgd_page_vaddr(pgd_t pgd) | |
883 | { | |
884 | return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK); | |
885 | } | |
886 | ||
887 | /* | |
888 | * Currently stuck as a macro due to indirect forward reference to | |
889 | * linux/mmzone.h's __section_mem_map_addr() definition: | |
890 | */ | |
891 | #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd)) | |
892 | ||
893 | /* to find an entry in a page-table-directory. */ | |
894 | static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) | |
895 | { | |
896 | return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address); | |
897 | } | |
898 | ||
899 | static inline int pgd_bad(pgd_t pgd) | |
900 | { | |
901 | unsigned long ignore_flags = _PAGE_USER; | |
902 | ||
903 | if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) | |
904 | ignore_flags |= _PAGE_NX; | |
905 | ||
906 | return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE; | |
907 | } | |
908 | ||
909 | static inline int pgd_none(pgd_t pgd) | |
910 | { | |
911 | /* | |
912 | * There is no need to do a workaround for the KNL stray | |
913 | * A/D bit erratum here. PGDs only point to page tables | |
914 | * except on 32-bit non-PAE which is not supported on | |
915 | * KNL. | |
916 | */ | |
917 | return !native_pgd_val(pgd); | |
918 | } | |
919 | #endif /* CONFIG_PGTABLE_LEVELS > 4 */ | |
920 | ||
921 | #endif /* __ASSEMBLY__ */ | |
922 | ||
923 | /* | |
924 | * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] | |
925 | * | |
926 | * this macro returns the index of the entry in the pgd page which would | |
927 | * control the given virtual address | |
928 | */ | |
929 | #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) | |
930 | ||
931 | /* | |
932 | * pgd_offset() returns a (pgd_t *) | |
933 | * pgd_index() is used get the offset into the pgd page's array of pgd_t's; | |
934 | */ | |
935 | #define pgd_offset_pgd(pgd, address) (pgd + pgd_index((address))) | |
936 | /* | |
937 | * a shortcut to get a pgd_t in a given mm | |
938 | */ | |
939 | #define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address)) | |
940 | /* | |
941 | * a shortcut which implies the use of the kernel's pgd, instead | |
942 | * of a process's | |
943 | */ | |
944 | #define pgd_offset_k(address) pgd_offset(&init_mm, (address)) | |
945 | ||
946 | ||
947 | #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET) | |
948 | #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY) | |
949 | ||
950 | #ifndef __ASSEMBLY__ | |
951 | ||
952 | extern int direct_gbpages; | |
953 | void init_mem_mapping(void); | |
954 | void early_alloc_pgt_buf(void); | |
955 | extern void memblock_find_dma_reserve(void); | |
956 | ||
957 | #ifdef CONFIG_X86_64 | |
958 | /* Realmode trampoline initialization. */ | |
959 | extern pgd_t trampoline_pgd_entry; | |
960 | static inline void __meminit init_trampoline_default(void) | |
961 | { | |
962 | /* Default trampoline pgd value */ | |
963 | trampoline_pgd_entry = init_top_pgt[pgd_index(__PAGE_OFFSET)]; | |
964 | } | |
965 | # ifdef CONFIG_RANDOMIZE_MEMORY | |
966 | void __meminit init_trampoline(void); | |
967 | # else | |
968 | # define init_trampoline init_trampoline_default | |
969 | # endif | |
970 | #else | |
971 | static inline void init_trampoline(void) { } | |
972 | #endif | |
973 | ||
974 | /* local pte updates need not use xchg for locking */ | |
975 | static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) | |
976 | { | |
977 | pte_t res = *ptep; | |
978 | ||
979 | /* Pure native function needs no input for mm, addr */ | |
980 | native_pte_clear(NULL, 0, ptep); | |
981 | return res; | |
982 | } | |
983 | ||
984 | static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp) | |
985 | { | |
986 | pmd_t res = *pmdp; | |
987 | ||
988 | native_pmd_clear(pmdp); | |
989 | return res; | |
990 | } | |
991 | ||
992 | static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp) | |
993 | { | |
994 | pud_t res = *pudp; | |
995 | ||
996 | native_pud_clear(pudp); | |
997 | return res; | |
998 | } | |
999 | ||
1000 | static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr, | |
1001 | pte_t *ptep , pte_t pte) | |
1002 | { | |
1003 | native_set_pte(ptep, pte); | |
1004 | } | |
1005 | ||
1006 | static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, | |
1007 | pmd_t *pmdp, pmd_t pmd) | |
1008 | { | |
1009 | native_set_pmd(pmdp, pmd); | |
1010 | } | |
1011 | ||
1012 | static inline void set_pud_at(struct mm_struct *mm, unsigned long addr, | |
1013 | pud_t *pudp, pud_t pud) | |
1014 | { | |
1015 | native_set_pud(pudp, pud); | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * We only update the dirty/accessed state if we set | |
1020 | * the dirty bit by hand in the kernel, since the hardware | |
1021 | * will do the accessed bit for us, and we don't want to | |
1022 | * race with other CPU's that might be updating the dirty | |
1023 | * bit at the same time. | |
1024 | */ | |
1025 | struct vm_area_struct; | |
1026 | ||
1027 | #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS | |
1028 | extern int ptep_set_access_flags(struct vm_area_struct *vma, | |
1029 | unsigned long address, pte_t *ptep, | |
1030 | pte_t entry, int dirty); | |
1031 | ||
1032 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
1033 | extern int ptep_test_and_clear_young(struct vm_area_struct *vma, | |
1034 | unsigned long addr, pte_t *ptep); | |
1035 | ||
1036 | #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH | |
1037 | extern int ptep_clear_flush_young(struct vm_area_struct *vma, | |
1038 | unsigned long address, pte_t *ptep); | |
1039 | ||
1040 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR | |
1041 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, | |
1042 | pte_t *ptep) | |
1043 | { | |
1044 | pte_t pte = native_ptep_get_and_clear(ptep); | |
1045 | return pte; | |
1046 | } | |
1047 | ||
1048 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL | |
1049 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, | |
1050 | unsigned long addr, pte_t *ptep, | |
1051 | int full) | |
1052 | { | |
1053 | pte_t pte; | |
1054 | if (full) { | |
1055 | /* | |
1056 | * Full address destruction in progress; paravirt does not | |
1057 | * care about updates and native needs no locking | |
1058 | */ | |
1059 | pte = native_local_ptep_get_and_clear(ptep); | |
1060 | } else { | |
1061 | pte = ptep_get_and_clear(mm, addr, ptep); | |
1062 | } | |
1063 | return pte; | |
1064 | } | |
1065 | ||
1066 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT | |
1067 | static inline void ptep_set_wrprotect(struct mm_struct *mm, | |
1068 | unsigned long addr, pte_t *ptep) | |
1069 | { | |
1070 | clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte); | |
1071 | } | |
1072 | ||
1073 | #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0) | |
1074 | ||
1075 | #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot)) | |
1076 | ||
1077 | #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS | |
1078 | extern int pmdp_set_access_flags(struct vm_area_struct *vma, | |
1079 | unsigned long address, pmd_t *pmdp, | |
1080 | pmd_t entry, int dirty); | |
1081 | extern int pudp_set_access_flags(struct vm_area_struct *vma, | |
1082 | unsigned long address, pud_t *pudp, | |
1083 | pud_t entry, int dirty); | |
1084 | ||
1085 | #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG | |
1086 | extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, | |
1087 | unsigned long addr, pmd_t *pmdp); | |
1088 | extern int pudp_test_and_clear_young(struct vm_area_struct *vma, | |
1089 | unsigned long addr, pud_t *pudp); | |
1090 | ||
1091 | #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH | |
1092 | extern int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
1093 | unsigned long address, pmd_t *pmdp); | |
1094 | ||
1095 | ||
1096 | #define pmd_write pmd_write | |
1097 | static inline int pmd_write(pmd_t pmd) | |
1098 | { | |
1099 | return pmd_flags(pmd) & _PAGE_RW; | |
1100 | } | |
1101 | ||
1102 | #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR | |
1103 | static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr, | |
1104 | pmd_t *pmdp) | |
1105 | { | |
1106 | return native_pmdp_get_and_clear(pmdp); | |
1107 | } | |
1108 | ||
1109 | #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR | |
1110 | static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, | |
1111 | unsigned long addr, pud_t *pudp) | |
1112 | { | |
1113 | return native_pudp_get_and_clear(pudp); | |
1114 | } | |
1115 | ||
1116 | #define __HAVE_ARCH_PMDP_SET_WRPROTECT | |
1117 | static inline void pmdp_set_wrprotect(struct mm_struct *mm, | |
1118 | unsigned long addr, pmd_t *pmdp) | |
1119 | { | |
1120 | clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp); | |
1121 | } | |
1122 | ||
1123 | #define pud_write pud_write | |
1124 | static inline int pud_write(pud_t pud) | |
1125 | { | |
1126 | return pud_flags(pud) & _PAGE_RW; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); | |
1131 | * | |
1132 | * dst - pointer to pgd range anwhere on a pgd page | |
1133 | * src - "" | |
1134 | * count - the number of pgds to copy. | |
1135 | * | |
1136 | * dst and src can be on the same page, but the range must not overlap, | |
1137 | * and must not cross a page boundary. | |
1138 | */ | |
1139 | static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) | |
1140 | { | |
1141 | memcpy(dst, src, count * sizeof(pgd_t)); | |
1142 | #ifdef CONFIG_PAGE_TABLE_ISOLATION | |
1143 | if (!static_cpu_has(X86_FEATURE_PTI)) | |
1144 | return; | |
1145 | /* Clone the user space pgd as well */ | |
1146 | memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src), | |
1147 | count * sizeof(pgd_t)); | |
1148 | #endif | |
1149 | } | |
1150 | ||
1151 | #define PTE_SHIFT ilog2(PTRS_PER_PTE) | |
1152 | static inline int page_level_shift(enum pg_level level) | |
1153 | { | |
1154 | return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT; | |
1155 | } | |
1156 | static inline unsigned long page_level_size(enum pg_level level) | |
1157 | { | |
1158 | return 1UL << page_level_shift(level); | |
1159 | } | |
1160 | static inline unsigned long page_level_mask(enum pg_level level) | |
1161 | { | |
1162 | return ~(page_level_size(level) - 1); | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * The x86 doesn't have any external MMU info: the kernel page | |
1167 | * tables contain all the necessary information. | |
1168 | */ | |
1169 | static inline void update_mmu_cache(struct vm_area_struct *vma, | |
1170 | unsigned long addr, pte_t *ptep) | |
1171 | { | |
1172 | } | |
1173 | static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, | |
1174 | unsigned long addr, pmd_t *pmd) | |
1175 | { | |
1176 | } | |
1177 | static inline void update_mmu_cache_pud(struct vm_area_struct *vma, | |
1178 | unsigned long addr, pud_t *pud) | |
1179 | { | |
1180 | } | |
1181 | ||
1182 | #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY | |
1183 | static inline pte_t pte_swp_mksoft_dirty(pte_t pte) | |
1184 | { | |
1185 | return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY); | |
1186 | } | |
1187 | ||
1188 | static inline int pte_swp_soft_dirty(pte_t pte) | |
1189 | { | |
1190 | return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY; | |
1191 | } | |
1192 | ||
1193 | static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) | |
1194 | { | |
1195 | return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY); | |
1196 | } | |
1197 | ||
1198 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION | |
1199 | static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) | |
1200 | { | |
1201 | return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY); | |
1202 | } | |
1203 | ||
1204 | static inline int pmd_swp_soft_dirty(pmd_t pmd) | |
1205 | { | |
1206 | return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY; | |
1207 | } | |
1208 | ||
1209 | static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) | |
1210 | { | |
1211 | return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY); | |
1212 | } | |
1213 | #endif | |
1214 | #endif | |
1215 | ||
1216 | #define PKRU_AD_BIT 0x1 | |
1217 | #define PKRU_WD_BIT 0x2 | |
1218 | #define PKRU_BITS_PER_PKEY 2 | |
1219 | ||
1220 | static inline bool __pkru_allows_read(u32 pkru, u16 pkey) | |
1221 | { | |
1222 | int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY; | |
1223 | return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits)); | |
1224 | } | |
1225 | ||
1226 | static inline bool __pkru_allows_write(u32 pkru, u16 pkey) | |
1227 | { | |
1228 | int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY; | |
1229 | /* | |
1230 | * Access-disable disables writes too so we need to check | |
1231 | * both bits here. | |
1232 | */ | |
1233 | return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits)); | |
1234 | } | |
1235 | ||
1236 | static inline u16 pte_flags_pkey(unsigned long pte_flags) | |
1237 | { | |
1238 | #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS | |
1239 | /* ifdef to avoid doing 59-bit shift on 32-bit values */ | |
1240 | return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0; | |
1241 | #else | |
1242 | return 0; | |
1243 | #endif | |
1244 | } | |
1245 | ||
1246 | static inline bool __pkru_allows_pkey(u16 pkey, bool write) | |
1247 | { | |
1248 | u32 pkru = read_pkru(); | |
1249 | ||
1250 | if (!__pkru_allows_read(pkru, pkey)) | |
1251 | return false; | |
1252 | if (write && !__pkru_allows_write(pkru, pkey)) | |
1253 | return false; | |
1254 | ||
1255 | return true; | |
1256 | } | |
1257 | ||
1258 | /* | |
1259 | * 'pteval' can come from a PTE, PMD or PUD. We only check | |
1260 | * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the | |
1261 | * same value on all 3 types. | |
1262 | */ | |
1263 | static inline bool __pte_access_permitted(unsigned long pteval, bool write) | |
1264 | { | |
1265 | unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER; | |
1266 | ||
1267 | if (write) | |
1268 | need_pte_bits |= _PAGE_RW; | |
1269 | ||
1270 | if ((pteval & need_pte_bits) != need_pte_bits) | |
1271 | return 0; | |
1272 | ||
1273 | return __pkru_allows_pkey(pte_flags_pkey(pteval), write); | |
1274 | } | |
1275 | ||
1276 | #define pte_access_permitted pte_access_permitted | |
1277 | static inline bool pte_access_permitted(pte_t pte, bool write) | |
1278 | { | |
1279 | return __pte_access_permitted(pte_val(pte), write); | |
1280 | } | |
1281 | ||
1282 | #define pmd_access_permitted pmd_access_permitted | |
1283 | static inline bool pmd_access_permitted(pmd_t pmd, bool write) | |
1284 | { | |
1285 | return __pte_access_permitted(pmd_val(pmd), write); | |
1286 | } | |
1287 | ||
1288 | #define pud_access_permitted pud_access_permitted | |
1289 | static inline bool pud_access_permitted(pud_t pud, bool write) | |
1290 | { | |
1291 | return __pte_access_permitted(pud_val(pud), write); | |
1292 | } | |
1293 | ||
1294 | #include <asm-generic/pgtable.h> | |
1295 | #endif /* __ASSEMBLY__ */ | |
1296 | ||
1297 | #endif /* _ASM_X86_PGTABLE_H */ |