Line data Source code
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 : #ifndef __ASSEMBLY__
19 : #include <linux/spinlock.h>
20 : #include <asm/x86_init.h>
21 : #include <asm/pkru.h>
22 : #include <asm/fpu/api.h>
23 : #include <asm/coco.h>
24 : #include <asm-generic/pgtable_uffd.h>
25 : #include <linux/page_table_check.h>
26 :
27 : extern pgd_t early_top_pgt[PTRS_PER_PGD];
28 : bool __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
29 :
30 : struct seq_file;
31 : void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm);
32 : void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm,
33 : bool user);
34 : void ptdump_walk_pgd_level_checkwx(void);
35 : void ptdump_walk_user_pgd_level_checkwx(void);
36 :
37 : /*
38 : * Macros to add or remove encryption attribute
39 : */
40 : #define pgprot_encrypted(prot) __pgprot(cc_mkenc(pgprot_val(prot)))
41 : #define pgprot_decrypted(prot) __pgprot(cc_mkdec(pgprot_val(prot)))
42 :
43 : #ifdef CONFIG_DEBUG_WX
44 : #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
45 : #define debug_checkwx_user() ptdump_walk_user_pgd_level_checkwx()
46 : #else
47 : #define debug_checkwx() do { } while (0)
48 : #define debug_checkwx_user() do { } while (0)
49 : #endif
50 :
51 : /*
52 : * ZERO_PAGE is a global shared page that is always zero: used
53 : * for zero-mapped memory areas etc..
54 : */
55 : extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
56 : __visible;
57 : #define ZERO_PAGE(vaddr) ((void)(vaddr),virt_to_page(empty_zero_page))
58 :
59 : extern spinlock_t pgd_lock;
60 : extern struct list_head pgd_list;
61 :
62 : extern struct mm_struct *pgd_page_get_mm(struct page *page);
63 :
64 : extern pmdval_t early_pmd_flags;
65 :
66 : #ifdef CONFIG_PARAVIRT_XXL
67 : #include <asm/paravirt.h>
68 : #else /* !CONFIG_PARAVIRT_XXL */
69 : #define set_pte(ptep, pte) native_set_pte(ptep, pte)
70 :
71 : #define set_pte_atomic(ptep, pte) \
72 : native_set_pte_atomic(ptep, pte)
73 :
74 : #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
75 :
76 : #ifndef __PAGETABLE_P4D_FOLDED
77 : #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
78 : #define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0)
79 : #endif
80 :
81 : #ifndef set_p4d
82 : # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
83 : #endif
84 :
85 : #ifndef __PAGETABLE_PUD_FOLDED
86 : #define p4d_clear(p4d) native_p4d_clear(p4d)
87 : #endif
88 :
89 : #ifndef set_pud
90 : # define set_pud(pudp, pud) native_set_pud(pudp, pud)
91 : #endif
92 :
93 : #ifndef __PAGETABLE_PUD_FOLDED
94 : #define pud_clear(pud) native_pud_clear(pud)
95 : #endif
96 :
97 : #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
98 : #define pmd_clear(pmd) native_pmd_clear(pmd)
99 :
100 : #define pgd_val(x) native_pgd_val(x)
101 : #define __pgd(x) native_make_pgd(x)
102 :
103 : #ifndef __PAGETABLE_P4D_FOLDED
104 : #define p4d_val(x) native_p4d_val(x)
105 : #define __p4d(x) native_make_p4d(x)
106 : #endif
107 :
108 : #ifndef __PAGETABLE_PUD_FOLDED
109 : #define pud_val(x) native_pud_val(x)
110 : #define __pud(x) native_make_pud(x)
111 : #endif
112 :
113 : #ifndef __PAGETABLE_PMD_FOLDED
114 : #define pmd_val(x) native_pmd_val(x)
115 : #define __pmd(x) native_make_pmd(x)
116 : #endif
117 :
118 : #define pte_val(x) native_pte_val(x)
119 : #define __pte(x) native_make_pte(x)
120 :
121 : #define arch_end_context_switch(prev) do {} while(0)
122 : #endif /* CONFIG_PARAVIRT_XXL */
123 :
124 : /*
125 : * The following only work if pte_present() is true.
126 : * Undefined behaviour if not..
127 : */
128 : static inline int pte_dirty(pte_t pte)
129 : {
130 : return pte_flags(pte) & _PAGE_DIRTY;
131 : }
132 :
133 : static inline int pte_young(pte_t pte)
134 : {
135 : return pte_flags(pte) & _PAGE_ACCESSED;
136 : }
137 :
138 : static inline int pmd_dirty(pmd_t pmd)
139 : {
140 : return pmd_flags(pmd) & _PAGE_DIRTY;
141 : }
142 :
143 : #define pmd_young pmd_young
144 : static inline int pmd_young(pmd_t pmd)
145 : {
146 : return pmd_flags(pmd) & _PAGE_ACCESSED;
147 : }
148 :
149 : static inline int pud_dirty(pud_t pud)
150 : {
151 : return pud_flags(pud) & _PAGE_DIRTY;
152 : }
153 :
154 : static inline int pud_young(pud_t pud)
155 : {
156 : return pud_flags(pud) & _PAGE_ACCESSED;
157 : }
158 :
159 : static inline int pte_write(pte_t pte)
160 : {
161 0 : return pte_flags(pte) & _PAGE_RW;
162 : }
163 :
164 : static inline int pte_huge(pte_t pte)
165 : {
166 : return pte_flags(pte) & _PAGE_PSE;
167 : }
168 :
169 : static inline int pte_global(pte_t pte)
170 : {
171 : return pte_flags(pte) & _PAGE_GLOBAL;
172 : }
173 :
174 : static inline int pte_exec(pte_t pte)
175 : {
176 : return !(pte_flags(pte) & _PAGE_NX);
177 : }
178 :
179 : static inline int pte_special(pte_t pte)
180 : {
181 : return pte_flags(pte) & _PAGE_SPECIAL;
182 : }
183 :
184 : /* Entries that were set to PROT_NONE are inverted */
185 :
186 : static inline u64 protnone_mask(u64 val);
187 :
188 : static inline unsigned long pte_pfn(pte_t pte)
189 : {
190 : phys_addr_t pfn = pte_val(pte);
191 : pfn ^= protnone_mask(pfn);
192 : return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT;
193 : }
194 :
195 : static inline unsigned long pmd_pfn(pmd_t pmd)
196 : {
197 : phys_addr_t pfn = pmd_val(pmd);
198 : pfn ^= protnone_mask(pfn);
199 : return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
200 : }
201 :
202 : static inline unsigned long pud_pfn(pud_t pud)
203 : {
204 : phys_addr_t pfn = pud_val(pud);
205 : pfn ^= protnone_mask(pfn);
206 : return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT;
207 : }
208 :
209 : static inline unsigned long p4d_pfn(p4d_t p4d)
210 : {
211 : return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
212 : }
213 :
214 : static inline unsigned long pgd_pfn(pgd_t pgd)
215 : {
216 : return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
217 : }
218 :
219 : #define p4d_leaf p4d_large
220 : static inline int p4d_large(p4d_t p4d)
221 : {
222 : /* No 512 GiB pages yet */
223 : return 0;
224 : }
225 :
226 : #define pte_page(pte) pfn_to_page(pte_pfn(pte))
227 :
228 : #define pmd_leaf pmd_large
229 : static inline int pmd_large(pmd_t pte)
230 : {
231 : return pmd_flags(pte) & _PAGE_PSE;
232 : }
233 :
234 : #ifdef CONFIG_TRANSPARENT_HUGEPAGE
235 : /* NOTE: when predicate huge page, consider also pmd_devmap, or use pmd_large */
236 : static inline int pmd_trans_huge(pmd_t pmd)
237 : {
238 2344287988 : return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
239 : }
240 :
241 : #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
242 : static inline int pud_trans_huge(pud_t pud)
243 : {
244 : return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
245 : }
246 : #endif
247 :
248 : #define has_transparent_hugepage has_transparent_hugepage
249 : static inline int has_transparent_hugepage(void)
250 : {
251 : return boot_cpu_has(X86_FEATURE_PSE);
252 : }
253 :
254 : #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
255 : static inline int pmd_devmap(pmd_t pmd)
256 : {
257 0 : return !!(pmd_val(pmd) & _PAGE_DEVMAP);
258 : }
259 :
260 : #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
261 : static inline int pud_devmap(pud_t pud)
262 : {
263 : return !!(pud_val(pud) & _PAGE_DEVMAP);
264 : }
265 : #else
266 : static inline int pud_devmap(pud_t pud)
267 : {
268 : return 0;
269 : }
270 : #endif
271 :
272 : static inline int pgd_devmap(pgd_t pgd)
273 : {
274 : return 0;
275 : }
276 : #endif
277 : #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
278 :
279 : static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
280 : {
281 : pteval_t v = native_pte_val(pte);
282 :
283 : return native_make_pte(v | set);
284 : }
285 :
286 : static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
287 : {
288 0 : pteval_t v = native_pte_val(pte);
289 :
290 0 : return native_make_pte(v & ~clear);
291 : }
292 :
293 : static inline pte_t pte_wrprotect(pte_t pte)
294 : {
295 : return pte_clear_flags(pte, _PAGE_RW);
296 : }
297 :
298 : #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
299 : static inline int pte_uffd_wp(pte_t pte)
300 : {
301 : bool wp = pte_flags(pte) & _PAGE_UFFD_WP;
302 :
303 : #ifdef CONFIG_DEBUG_VM
304 : /*
305 : * Having write bit for wr-protect-marked present ptes is fatal,
306 : * because it means the uffd-wp bit will be ignored and write will
307 : * just go through.
308 : *
309 : * Use any chance of pgtable walking to verify this (e.g., when
310 : * page swapped out or being migrated for all purposes). It means
311 : * something is already wrong. Tell the admin even before the
312 : * process crashes. We also nail it with wrong pgtable setup.
313 : */
314 : WARN_ON_ONCE(wp && pte_write(pte));
315 : #endif
316 :
317 : return wp;
318 : }
319 :
320 : static inline pte_t pte_mkuffd_wp(pte_t pte)
321 : {
322 : return pte_wrprotect(pte_set_flags(pte, _PAGE_UFFD_WP));
323 : }
324 :
325 : static inline pte_t pte_clear_uffd_wp(pte_t pte)
326 : {
327 : return pte_clear_flags(pte, _PAGE_UFFD_WP);
328 : }
329 : #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
330 :
331 : static inline pte_t pte_mkclean(pte_t pte)
332 : {
333 : return pte_clear_flags(pte, _PAGE_DIRTY);
334 : }
335 :
336 : static inline pte_t pte_mkold(pte_t pte)
337 : {
338 : return pte_clear_flags(pte, _PAGE_ACCESSED);
339 : }
340 :
341 : static inline pte_t pte_mkexec(pte_t pte)
342 : {
343 : return pte_clear_flags(pte, _PAGE_NX);
344 : }
345 :
346 : static inline pte_t pte_mkdirty(pte_t pte)
347 : {
348 : return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
349 : }
350 :
351 : static inline pte_t pte_mkyoung(pte_t pte)
352 : {
353 : return pte_set_flags(pte, _PAGE_ACCESSED);
354 : }
355 :
356 : static inline pte_t pte_mkwrite(pte_t pte)
357 : {
358 : return pte_set_flags(pte, _PAGE_RW);
359 : }
360 :
361 : static inline pte_t pte_mkhuge(pte_t pte)
362 : {
363 : return pte_set_flags(pte, _PAGE_PSE);
364 : }
365 :
366 : static inline pte_t pte_clrhuge(pte_t pte)
367 : {
368 : return pte_clear_flags(pte, _PAGE_PSE);
369 : }
370 :
371 : static inline pte_t pte_mkglobal(pte_t pte)
372 : {
373 : return pte_set_flags(pte, _PAGE_GLOBAL);
374 : }
375 :
376 : static inline pte_t pte_clrglobal(pte_t pte)
377 : {
378 : return pte_clear_flags(pte, _PAGE_GLOBAL);
379 : }
380 :
381 : static inline pte_t pte_mkspecial(pte_t pte)
382 : {
383 : return pte_set_flags(pte, _PAGE_SPECIAL);
384 : }
385 :
386 : static inline pte_t pte_mkdevmap(pte_t pte)
387 : {
388 : return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
389 : }
390 :
391 : static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
392 : {
393 0 : pmdval_t v = native_pmd_val(pmd);
394 :
395 0 : return native_make_pmd(v | set);
396 : }
397 :
398 : static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
399 : {
400 : pmdval_t v = native_pmd_val(pmd);
401 :
402 : return native_make_pmd(v & ~clear);
403 : }
404 :
405 : static inline pmd_t pmd_wrprotect(pmd_t pmd)
406 : {
407 : return pmd_clear_flags(pmd, _PAGE_RW);
408 : }
409 :
410 : #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
411 : static inline int pmd_uffd_wp(pmd_t pmd)
412 : {
413 : return pmd_flags(pmd) & _PAGE_UFFD_WP;
414 : }
415 :
416 : static inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
417 : {
418 : return pmd_wrprotect(pmd_set_flags(pmd, _PAGE_UFFD_WP));
419 : }
420 :
421 : static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
422 : {
423 : return pmd_clear_flags(pmd, _PAGE_UFFD_WP);
424 : }
425 : #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
426 :
427 : static inline pmd_t pmd_mkold(pmd_t pmd)
428 : {
429 : return pmd_clear_flags(pmd, _PAGE_ACCESSED);
430 : }
431 :
432 : static inline pmd_t pmd_mkclean(pmd_t pmd)
433 : {
434 : return pmd_clear_flags(pmd, _PAGE_DIRTY);
435 : }
436 :
437 : static inline pmd_t pmd_mkdirty(pmd_t pmd)
438 : {
439 : return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
440 : }
441 :
442 : static inline pmd_t pmd_mkdevmap(pmd_t pmd)
443 : {
444 : return pmd_set_flags(pmd, _PAGE_DEVMAP);
445 : }
446 :
447 : static inline pmd_t pmd_mkhuge(pmd_t pmd)
448 : {
449 0 : return pmd_set_flags(pmd, _PAGE_PSE);
450 : }
451 :
452 : static inline pmd_t pmd_mkyoung(pmd_t pmd)
453 : {
454 : return pmd_set_flags(pmd, _PAGE_ACCESSED);
455 : }
456 :
457 : static inline pmd_t pmd_mkwrite(pmd_t pmd)
458 : {
459 : return pmd_set_flags(pmd, _PAGE_RW);
460 : }
461 :
462 : static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
463 : {
464 : pudval_t v = native_pud_val(pud);
465 :
466 : return native_make_pud(v | set);
467 : }
468 :
469 : static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
470 : {
471 : pudval_t v = native_pud_val(pud);
472 :
473 : return native_make_pud(v & ~clear);
474 : }
475 :
476 : static inline pud_t pud_mkold(pud_t pud)
477 : {
478 : return pud_clear_flags(pud, _PAGE_ACCESSED);
479 : }
480 :
481 : static inline pud_t pud_mkclean(pud_t pud)
482 : {
483 : return pud_clear_flags(pud, _PAGE_DIRTY);
484 : }
485 :
486 : static inline pud_t pud_wrprotect(pud_t pud)
487 : {
488 : return pud_clear_flags(pud, _PAGE_RW);
489 : }
490 :
491 : static inline pud_t pud_mkdirty(pud_t pud)
492 : {
493 : return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
494 : }
495 :
496 : static inline pud_t pud_mkdevmap(pud_t pud)
497 : {
498 : return pud_set_flags(pud, _PAGE_DEVMAP);
499 : }
500 :
501 : static inline pud_t pud_mkhuge(pud_t pud)
502 : {
503 : return pud_set_flags(pud, _PAGE_PSE);
504 : }
505 :
506 : static inline pud_t pud_mkyoung(pud_t pud)
507 : {
508 : return pud_set_flags(pud, _PAGE_ACCESSED);
509 : }
510 :
511 : static inline pud_t pud_mkwrite(pud_t pud)
512 : {
513 : return pud_set_flags(pud, _PAGE_RW);
514 : }
515 :
516 : #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
517 : static inline int pte_soft_dirty(pte_t pte)
518 : {
519 : return pte_flags(pte) & _PAGE_SOFT_DIRTY;
520 : }
521 :
522 : static inline int pmd_soft_dirty(pmd_t pmd)
523 : {
524 : return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
525 : }
526 :
527 : static inline int pud_soft_dirty(pud_t pud)
528 : {
529 : return pud_flags(pud) & _PAGE_SOFT_DIRTY;
530 : }
531 :
532 : static inline pte_t pte_mksoft_dirty(pte_t pte)
533 : {
534 : return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
535 : }
536 :
537 : static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
538 : {
539 : return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
540 : }
541 :
542 : static inline pud_t pud_mksoft_dirty(pud_t pud)
543 : {
544 : return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
545 : }
546 :
547 : static inline pte_t pte_clear_soft_dirty(pte_t pte)
548 : {
549 : return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
550 : }
551 :
552 : static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
553 : {
554 : return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
555 : }
556 :
557 : static inline pud_t pud_clear_soft_dirty(pud_t pud)
558 : {
559 : return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
560 : }
561 :
562 : #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
563 :
564 : /*
565 : * Mask out unsupported bits in a present pgprot. Non-present pgprots
566 : * can use those bits for other purposes, so leave them be.
567 : */
568 : static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
569 : {
570 0 : pgprotval_t protval = pgprot_val(pgprot);
571 :
572 0 : if (protval & _PAGE_PRESENT)
573 0 : protval &= __supported_pte_mask;
574 :
575 0 : return protval;
576 : }
577 :
578 0 : static inline pgprotval_t check_pgprot(pgprot_t pgprot)
579 : {
580 0 : pgprotval_t massaged_val = massage_pgprot(pgprot);
581 :
582 : /* mmdebug.h can not be included here because of dependencies */
583 : #ifdef CONFIG_DEBUG_VM
584 0 : WARN_ONCE(pgprot_val(pgprot) != massaged_val,
585 : "attempted to set unsupported pgprot: %016llx "
586 : "bits: %016llx supported: %016llx\n",
587 : (u64)pgprot_val(pgprot),
588 : (u64)pgprot_val(pgprot) ^ massaged_val,
589 : (u64)__supported_pte_mask);
590 : #endif
591 :
592 0 : return massaged_val;
593 : }
594 :
595 : static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
596 : {
597 : phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
598 : pfn ^= protnone_mask(pgprot_val(pgprot));
599 : pfn &= PTE_PFN_MASK;
600 : return __pte(pfn | check_pgprot(pgprot));
601 : }
602 :
603 0 : static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
604 : {
605 0 : phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
606 0 : pfn ^= protnone_mask(pgprot_val(pgprot));
607 0 : pfn &= PHYSICAL_PMD_PAGE_MASK;
608 0 : return __pmd(pfn | check_pgprot(pgprot));
609 : }
610 :
611 : static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
612 : {
613 : phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
614 : pfn ^= protnone_mask(pgprot_val(pgprot));
615 : pfn &= PHYSICAL_PUD_PAGE_MASK;
616 : return __pud(pfn | check_pgprot(pgprot));
617 : }
618 :
619 : static inline pmd_t pmd_mkinvalid(pmd_t pmd)
620 : {
621 : return pfn_pmd(pmd_pfn(pmd),
622 : __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
623 : }
624 :
625 : static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
626 :
627 : static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
628 : {
629 : pteval_t val = pte_val(pte), oldval = val;
630 :
631 : /*
632 : * Chop off the NX bit (if present), and add the NX portion of
633 : * the newprot (if present):
634 : */
635 : val &= _PAGE_CHG_MASK;
636 : val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK;
637 : val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
638 : return __pte(val);
639 : }
640 :
641 : static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
642 : {
643 : pmdval_t val = pmd_val(pmd), oldval = val;
644 :
645 : val &= _HPAGE_CHG_MASK;
646 : val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK;
647 : val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
648 : return __pmd(val);
649 : }
650 :
651 : /*
652 : * mprotect needs to preserve PAT and encryption bits when updating
653 : * vm_page_prot
654 : */
655 : #define pgprot_modify pgprot_modify
656 : static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
657 : {
658 : pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
659 : pgprotval_t addbits = pgprot_val(newprot) & ~_PAGE_CHG_MASK;
660 : return __pgprot(preservebits | addbits);
661 : }
662 :
663 : #define pte_pgprot(x) __pgprot(pte_flags(x))
664 : #define pmd_pgprot(x) __pgprot(pmd_flags(x))
665 : #define pud_pgprot(x) __pgprot(pud_flags(x))
666 : #define p4d_pgprot(x) __pgprot(p4d_flags(x))
667 :
668 : #define canon_pgprot(p) __pgprot(massage_pgprot(p))
669 :
670 : static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
671 : enum page_cache_mode pcm,
672 : enum page_cache_mode new_pcm)
673 : {
674 : /*
675 : * PAT type is always WB for untracked ranges, so no need to check.
676 : */
677 : if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
678 : return 1;
679 :
680 : /*
681 : * Certain new memtypes are not allowed with certain
682 : * requested memtype:
683 : * - request is uncached, return cannot be write-back
684 : * - request is write-combine, return cannot be write-back
685 : * - request is write-through, return cannot be write-back
686 : * - request is write-through, return cannot be write-combine
687 : */
688 : if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
689 : new_pcm == _PAGE_CACHE_MODE_WB) ||
690 : (pcm == _PAGE_CACHE_MODE_WC &&
691 : new_pcm == _PAGE_CACHE_MODE_WB) ||
692 : (pcm == _PAGE_CACHE_MODE_WT &&
693 : new_pcm == _PAGE_CACHE_MODE_WB) ||
694 : (pcm == _PAGE_CACHE_MODE_WT &&
695 : new_pcm == _PAGE_CACHE_MODE_WC)) {
696 : return 0;
697 : }
698 :
699 : return 1;
700 : }
701 :
702 : pmd_t *populate_extra_pmd(unsigned long vaddr);
703 : pte_t *populate_extra_pte(unsigned long vaddr);
704 :
705 : #ifdef CONFIG_PAGE_TABLE_ISOLATION
706 : pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd);
707 :
708 : /*
709 : * Take a PGD location (pgdp) and a pgd value that needs to be set there.
710 : * Populates the user and returns the resulting PGD that must be set in
711 : * the kernel copy of the page tables.
712 : */
713 : static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
714 : {
715 : if (!static_cpu_has(X86_FEATURE_PTI))
716 : return pgd;
717 : return __pti_set_user_pgtbl(pgdp, pgd);
718 : }
719 : #else /* CONFIG_PAGE_TABLE_ISOLATION */
720 : static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
721 : {
722 : return pgd;
723 : }
724 : #endif /* CONFIG_PAGE_TABLE_ISOLATION */
725 :
726 : #endif /* __ASSEMBLY__ */
727 :
728 :
729 : #ifdef CONFIG_X86_32
730 : # include <asm/pgtable_32.h>
731 : #else
732 : # include <asm/pgtable_64.h>
733 : #endif
734 :
735 : #ifndef __ASSEMBLY__
736 : #include <linux/mm_types.h>
737 : #include <linux/mmdebug.h>
738 : #include <linux/log2.h>
739 : #include <asm/fixmap.h>
740 :
741 : static inline int pte_none(pte_t pte)
742 : {
743 30719264272 : return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
744 : }
745 :
746 : #define __HAVE_ARCH_PTE_SAME
747 : static inline int pte_same(pte_t a, pte_t b)
748 : {
749 : return a.pte == b.pte;
750 : }
751 :
752 : static inline int pte_present(pte_t a)
753 : {
754 0 : return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
755 : }
756 :
757 : #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
758 : static inline int pte_devmap(pte_t a)
759 : {
760 : return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
761 : }
762 : #endif
763 :
764 : #define pte_accessible pte_accessible
765 : static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
766 : {
767 : if (pte_flags(a) & _PAGE_PRESENT)
768 : return true;
769 :
770 : if ((pte_flags(a) & _PAGE_PROTNONE) &&
771 : atomic_read(&mm->tlb_flush_pending))
772 : return true;
773 :
774 : return false;
775 : }
776 :
777 : static inline int pmd_present(pmd_t pmd)
778 : {
779 : /*
780 : * Checking for _PAGE_PSE is needed too because
781 : * split_huge_page will temporarily clear the present bit (but
782 : * the _PAGE_PSE flag will remain set at all times while the
783 : * _PAGE_PRESENT bit is clear).
784 : */
785 0 : return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
786 : }
787 :
788 : #ifdef CONFIG_NUMA_BALANCING
789 : /*
790 : * These work without NUMA balancing but the kernel does not care. See the
791 : * comment in include/linux/pgtable.h
792 : */
793 : static inline int pte_protnone(pte_t pte)
794 : {
795 : return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
796 : == _PAGE_PROTNONE;
797 : }
798 :
799 : static inline int pmd_protnone(pmd_t pmd)
800 : {
801 : return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
802 : == _PAGE_PROTNONE;
803 : }
804 : #endif /* CONFIG_NUMA_BALANCING */
805 :
806 : static inline int pmd_none(pmd_t pmd)
807 : {
808 : /* Only check low word on 32-bit platforms, since it might be
809 : out of sync with upper half. */
810 2344250132 : unsigned long val = native_pmd_val(pmd);
811 2418262634 : return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
812 : }
813 :
814 : static inline unsigned long pmd_page_vaddr(pmd_t pmd)
815 : {
816 : return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
817 : }
818 :
819 : /*
820 : * Currently stuck as a macro due to indirect forward reference to
821 : * linux/mmzone.h's __section_mem_map_addr() definition:
822 : */
823 : #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
824 :
825 : /*
826 : * Conversion functions: convert a page and protection to a page entry,
827 : * and a page entry and page directory to the page they refer to.
828 : *
829 : * (Currently stuck as a macro because of indirect forward reference
830 : * to linux/mm.h:page_to_nid())
831 : */
832 : #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
833 :
834 : static inline int pmd_bad(pmd_t pmd)
835 : {
836 : return (pmd_flags(pmd) & ~(_PAGE_USER | _PAGE_ACCESSED)) !=
837 : (_KERNPG_TABLE & ~_PAGE_ACCESSED);
838 : }
839 :
840 : static inline unsigned long pages_to_mb(unsigned long npg)
841 : {
842 : return npg >> (20 - PAGE_SHIFT);
843 : }
844 :
845 : #if CONFIG_PGTABLE_LEVELS > 2
846 : static inline int pud_none(pud_t pud)
847 : {
848 : return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
849 : }
850 :
851 : static inline int pud_present(pud_t pud)
852 : {
853 0 : return pud_flags(pud) & _PAGE_PRESENT;
854 : }
855 :
856 : static inline pmd_t *pud_pgtable(pud_t pud)
857 : {
858 0 : return (pmd_t *)__va(pud_val(pud) & pud_pfn_mask(pud));
859 : }
860 :
861 : /*
862 : * Currently stuck as a macro due to indirect forward reference to
863 : * linux/mmzone.h's __section_mem_map_addr() definition:
864 : */
865 : #define pud_page(pud) pfn_to_page(pud_pfn(pud))
866 :
867 : #define pud_leaf pud_large
868 : static inline int pud_large(pud_t pud)
869 : {
870 : return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
871 : (_PAGE_PSE | _PAGE_PRESENT);
872 : }
873 :
874 : static inline int pud_bad(pud_t pud)
875 : {
876 : return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
877 : }
878 : #else
879 : #define pud_leaf pud_large
880 : static inline int pud_large(pud_t pud)
881 : {
882 : return 0;
883 : }
884 : #endif /* CONFIG_PGTABLE_LEVELS > 2 */
885 :
886 : #if CONFIG_PGTABLE_LEVELS > 3
887 : static inline int p4d_none(p4d_t p4d)
888 : {
889 : return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
890 : }
891 :
892 : static inline int p4d_present(p4d_t p4d)
893 : {
894 0 : return p4d_flags(p4d) & _PAGE_PRESENT;
895 : }
896 :
897 : static inline pud_t *p4d_pgtable(p4d_t p4d)
898 : {
899 0 : return (pud_t *)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
900 : }
901 :
902 : /*
903 : * Currently stuck as a macro due to indirect forward reference to
904 : * linux/mmzone.h's __section_mem_map_addr() definition:
905 : */
906 : #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
907 :
908 : static inline int p4d_bad(p4d_t p4d)
909 : {
910 : unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER;
911 :
912 : if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
913 : ignore_flags |= _PAGE_NX;
914 :
915 : return (p4d_flags(p4d) & ~ignore_flags) != 0;
916 : }
917 : #endif /* CONFIG_PGTABLE_LEVELS > 3 */
918 :
919 : static inline unsigned long p4d_index(unsigned long address)
920 : {
921 : return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
922 : }
923 :
924 : #if CONFIG_PGTABLE_LEVELS > 4
925 : static inline int pgd_present(pgd_t pgd)
926 : {
927 : if (!pgtable_l5_enabled())
928 : return 1;
929 : return pgd_flags(pgd) & _PAGE_PRESENT;
930 : }
931 :
932 : static inline unsigned long pgd_page_vaddr(pgd_t pgd)
933 : {
934 : return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
935 : }
936 :
937 : /*
938 : * Currently stuck as a macro due to indirect forward reference to
939 : * linux/mmzone.h's __section_mem_map_addr() definition:
940 : */
941 : #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
942 :
943 : /* to find an entry in a page-table-directory. */
944 : static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
945 : {
946 : if (!pgtable_l5_enabled())
947 : return (p4d_t *)pgd;
948 : return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
949 : }
950 :
951 : static inline int pgd_bad(pgd_t pgd)
952 : {
953 : unsigned long ignore_flags = _PAGE_USER;
954 :
955 : if (!pgtable_l5_enabled())
956 : return 0;
957 :
958 : if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
959 : ignore_flags |= _PAGE_NX;
960 :
961 : return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
962 : }
963 :
964 : static inline int pgd_none(pgd_t pgd)
965 : {
966 : if (!pgtable_l5_enabled())
967 : return 0;
968 : /*
969 : * There is no need to do a workaround for the KNL stray
970 : * A/D bit erratum here. PGDs only point to page tables
971 : * except on 32-bit non-PAE which is not supported on
972 : * KNL.
973 : */
974 : return !native_pgd_val(pgd);
975 : }
976 : #endif /* CONFIG_PGTABLE_LEVELS > 4 */
977 :
978 : #endif /* __ASSEMBLY__ */
979 :
980 : #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
981 : #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
982 :
983 : #ifndef __ASSEMBLY__
984 :
985 : extern int direct_gbpages;
986 : void init_mem_mapping(void);
987 : void early_alloc_pgt_buf(void);
988 : extern void memblock_find_dma_reserve(void);
989 : void __init poking_init(void);
990 : unsigned long init_memory_mapping(unsigned long start,
991 : unsigned long end, pgprot_t prot);
992 :
993 : #ifdef CONFIG_X86_64
994 : extern pgd_t trampoline_pgd_entry;
995 : #endif
996 :
997 : /* local pte updates need not use xchg for locking */
998 : static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
999 : {
1000 : pte_t res = *ptep;
1001 :
1002 : /* Pure native function needs no input for mm, addr */
1003 : native_pte_clear(NULL, 0, ptep);
1004 : return res;
1005 : }
1006 :
1007 : static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
1008 : {
1009 : pmd_t res = *pmdp;
1010 :
1011 : native_pmd_clear(pmdp);
1012 : return res;
1013 : }
1014 :
1015 : static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
1016 : {
1017 : pud_t res = *pudp;
1018 :
1019 : native_pud_clear(pudp);
1020 : return res;
1021 : }
1022 :
1023 : static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
1024 : pte_t *ptep, pte_t pte)
1025 : {
1026 : page_table_check_pte_set(mm, addr, ptep, pte);
1027 : set_pte(ptep, pte);
1028 : }
1029 :
1030 : static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1031 : pmd_t *pmdp, pmd_t pmd)
1032 : {
1033 0 : page_table_check_pmd_set(mm, addr, pmdp, pmd);
1034 0 : set_pmd(pmdp, pmd);
1035 : }
1036 :
1037 : static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
1038 : pud_t *pudp, pud_t pud)
1039 : {
1040 : page_table_check_pud_set(mm, addr, pudp, pud);
1041 : native_set_pud(pudp, pud);
1042 : }
1043 :
1044 : /*
1045 : * We only update the dirty/accessed state if we set
1046 : * the dirty bit by hand in the kernel, since the hardware
1047 : * will do the accessed bit for us, and we don't want to
1048 : * race with other CPU's that might be updating the dirty
1049 : * bit at the same time.
1050 : */
1051 : struct vm_area_struct;
1052 :
1053 : #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1054 : extern int ptep_set_access_flags(struct vm_area_struct *vma,
1055 : unsigned long address, pte_t *ptep,
1056 : pte_t entry, int dirty);
1057 :
1058 : #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1059 : extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1060 : unsigned long addr, pte_t *ptep);
1061 :
1062 : #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1063 : extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1064 : unsigned long address, pte_t *ptep);
1065 :
1066 : #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1067 : static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1068 : pte_t *ptep)
1069 : {
1070 : pte_t pte = native_ptep_get_and_clear(ptep);
1071 : page_table_check_pte_clear(mm, addr, pte);
1072 : return pte;
1073 : }
1074 :
1075 : #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1076 : static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1077 : unsigned long addr, pte_t *ptep,
1078 : int full)
1079 : {
1080 : pte_t pte;
1081 : if (full) {
1082 : /*
1083 : * Full address destruction in progress; paravirt does not
1084 : * care about updates and native needs no locking
1085 : */
1086 : pte = native_local_ptep_get_and_clear(ptep);
1087 : page_table_check_pte_clear(mm, addr, pte);
1088 : } else {
1089 : pte = ptep_get_and_clear(mm, addr, ptep);
1090 : }
1091 : return pte;
1092 : }
1093 :
1094 : #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1095 : static inline void ptep_set_wrprotect(struct mm_struct *mm,
1096 : unsigned long addr, pte_t *ptep)
1097 : {
1098 : clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1099 : }
1100 :
1101 : #define flush_tlb_fix_spurious_fault(vma, address, ptep) do { } while (0)
1102 :
1103 : #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1104 :
1105 : #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1106 : extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1107 : unsigned long address, pmd_t *pmdp,
1108 : pmd_t entry, int dirty);
1109 : extern int pudp_set_access_flags(struct vm_area_struct *vma,
1110 : unsigned long address, pud_t *pudp,
1111 : pud_t entry, int dirty);
1112 :
1113 : #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1114 : extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1115 : unsigned long addr, pmd_t *pmdp);
1116 : extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1117 : unsigned long addr, pud_t *pudp);
1118 :
1119 : #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1120 : extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1121 : unsigned long address, pmd_t *pmdp);
1122 :
1123 :
1124 : #define pmd_write pmd_write
1125 : static inline int pmd_write(pmd_t pmd)
1126 : {
1127 0 : return pmd_flags(pmd) & _PAGE_RW;
1128 : }
1129 :
1130 : #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1131 : static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1132 : pmd_t *pmdp)
1133 : {
1134 : pmd_t pmd = native_pmdp_get_and_clear(pmdp);
1135 :
1136 : page_table_check_pmd_clear(mm, addr, pmd);
1137 :
1138 : return pmd;
1139 : }
1140 :
1141 : #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1142 : static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1143 : unsigned long addr, pud_t *pudp)
1144 : {
1145 : pud_t pud = native_pudp_get_and_clear(pudp);
1146 :
1147 : page_table_check_pud_clear(mm, addr, pud);
1148 :
1149 : return pud;
1150 : }
1151 :
1152 : #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1153 : static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1154 : unsigned long addr, pmd_t *pmdp)
1155 : {
1156 : clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1157 : }
1158 :
1159 : #define pud_write pud_write
1160 : static inline int pud_write(pud_t pud)
1161 : {
1162 : return pud_flags(pud) & _PAGE_RW;
1163 : }
1164 :
1165 : #ifndef pmdp_establish
1166 : #define pmdp_establish pmdp_establish
1167 : static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1168 : unsigned long address, pmd_t *pmdp, pmd_t pmd)
1169 : {
1170 : page_table_check_pmd_set(vma->vm_mm, address, pmdp, pmd);
1171 : if (IS_ENABLED(CONFIG_SMP)) {
1172 : return xchg(pmdp, pmd);
1173 : } else {
1174 : pmd_t old = *pmdp;
1175 : WRITE_ONCE(*pmdp, pmd);
1176 : return old;
1177 : }
1178 : }
1179 : #endif
1180 :
1181 : #define __HAVE_ARCH_PMDP_INVALIDATE_AD
1182 : extern pmd_t pmdp_invalidate_ad(struct vm_area_struct *vma,
1183 : unsigned long address, pmd_t *pmdp);
1184 :
1185 : /*
1186 : * Page table pages are page-aligned. The lower half of the top
1187 : * level is used for userspace and the top half for the kernel.
1188 : *
1189 : * Returns true for parts of the PGD that map userspace and
1190 : * false for the parts that map the kernel.
1191 : */
1192 : static inline bool pgdp_maps_userspace(void *__ptr)
1193 : {
1194 : unsigned long ptr = (unsigned long)__ptr;
1195 :
1196 : return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
1197 : }
1198 :
1199 : #define pgd_leaf pgd_large
1200 : static inline int pgd_large(pgd_t pgd) { return 0; }
1201 :
1202 : #ifdef CONFIG_PAGE_TABLE_ISOLATION
1203 : /*
1204 : * All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
1205 : * (8k-aligned and 8k in size). The kernel one is at the beginning 4k and
1206 : * the user one is in the last 4k. To switch between them, you
1207 : * just need to flip the 12th bit in their addresses.
1208 : */
1209 : #define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
1210 :
1211 : /*
1212 : * This generates better code than the inline assembly in
1213 : * __set_bit().
1214 : */
1215 : static inline void *ptr_set_bit(void *ptr, int bit)
1216 : {
1217 : unsigned long __ptr = (unsigned long)ptr;
1218 :
1219 : __ptr |= BIT(bit);
1220 : return (void *)__ptr;
1221 : }
1222 : static inline void *ptr_clear_bit(void *ptr, int bit)
1223 : {
1224 : unsigned long __ptr = (unsigned long)ptr;
1225 :
1226 : __ptr &= ~BIT(bit);
1227 : return (void *)__ptr;
1228 : }
1229 :
1230 : static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
1231 : {
1232 : return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1233 : }
1234 :
1235 : static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
1236 : {
1237 : return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1238 : }
1239 :
1240 : static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
1241 : {
1242 : return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1243 : }
1244 :
1245 : static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
1246 : {
1247 : return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1248 : }
1249 : #endif /* CONFIG_PAGE_TABLE_ISOLATION */
1250 :
1251 : /*
1252 : * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1253 : *
1254 : * dst - pointer to pgd range anywhere on a pgd page
1255 : * src - ""
1256 : * count - the number of pgds to copy.
1257 : *
1258 : * dst and src can be on the same page, but the range must not overlap,
1259 : * and must not cross a page boundary.
1260 : */
1261 : static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1262 : {
1263 : memcpy(dst, src, count * sizeof(pgd_t));
1264 : #ifdef CONFIG_PAGE_TABLE_ISOLATION
1265 : if (!static_cpu_has(X86_FEATURE_PTI))
1266 : return;
1267 : /* Clone the user space pgd as well */
1268 : memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1269 : count * sizeof(pgd_t));
1270 : #endif
1271 : }
1272 :
1273 : #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1274 : static inline int page_level_shift(enum pg_level level)
1275 : {
1276 : return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1277 : }
1278 : static inline unsigned long page_level_size(enum pg_level level)
1279 : {
1280 : return 1UL << page_level_shift(level);
1281 : }
1282 : static inline unsigned long page_level_mask(enum pg_level level)
1283 : {
1284 : return ~(page_level_size(level) - 1);
1285 : }
1286 :
1287 : /*
1288 : * The x86 doesn't have any external MMU info: the kernel page
1289 : * tables contain all the necessary information.
1290 : */
1291 : static inline void update_mmu_cache(struct vm_area_struct *vma,
1292 : unsigned long addr, pte_t *ptep)
1293 : {
1294 : }
1295 : static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1296 : unsigned long addr, pmd_t *pmd)
1297 : {
1298 : }
1299 : static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1300 : unsigned long addr, pud_t *pud)
1301 : {
1302 : }
1303 : static inline pte_t pte_swp_mkexclusive(pte_t pte)
1304 : {
1305 : return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE);
1306 : }
1307 :
1308 : static inline int pte_swp_exclusive(pte_t pte)
1309 : {
1310 0 : return pte_flags(pte) & _PAGE_SWP_EXCLUSIVE;
1311 : }
1312 :
1313 : static inline pte_t pte_swp_clear_exclusive(pte_t pte)
1314 : {
1315 0 : return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE);
1316 : }
1317 :
1318 : #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1319 : static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1320 : {
1321 : return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1322 : }
1323 :
1324 : static inline int pte_swp_soft_dirty(pte_t pte)
1325 : {
1326 : return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1327 : }
1328 :
1329 : static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1330 : {
1331 : return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1332 : }
1333 :
1334 : #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1335 : static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1336 : {
1337 : return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1338 : }
1339 :
1340 : static inline int pmd_swp_soft_dirty(pmd_t pmd)
1341 : {
1342 : return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1343 : }
1344 :
1345 : static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1346 : {
1347 : return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1348 : }
1349 : #endif
1350 : #endif
1351 :
1352 : #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
1353 : static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
1354 : {
1355 : return pte_set_flags(pte, _PAGE_SWP_UFFD_WP);
1356 : }
1357 :
1358 : static inline int pte_swp_uffd_wp(pte_t pte)
1359 : {
1360 0 : return pte_flags(pte) & _PAGE_SWP_UFFD_WP;
1361 : }
1362 :
1363 : static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
1364 : {
1365 0 : return pte_clear_flags(pte, _PAGE_SWP_UFFD_WP);
1366 : }
1367 :
1368 : static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
1369 : {
1370 : return pmd_set_flags(pmd, _PAGE_SWP_UFFD_WP);
1371 : }
1372 :
1373 : static inline int pmd_swp_uffd_wp(pmd_t pmd)
1374 : {
1375 : return pmd_flags(pmd) & _PAGE_SWP_UFFD_WP;
1376 : }
1377 :
1378 : static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
1379 : {
1380 : return pmd_clear_flags(pmd, _PAGE_SWP_UFFD_WP);
1381 : }
1382 : #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
1383 :
1384 : static inline u16 pte_flags_pkey(unsigned long pte_flags)
1385 : {
1386 : #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1387 : /* ifdef to avoid doing 59-bit shift on 32-bit values */
1388 : return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1389 : #else
1390 : return 0;
1391 : #endif
1392 : }
1393 :
1394 : static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1395 : {
1396 : u32 pkru = read_pkru();
1397 :
1398 : if (!__pkru_allows_read(pkru, pkey))
1399 : return false;
1400 : if (write && !__pkru_allows_write(pkru, pkey))
1401 : return false;
1402 :
1403 : return true;
1404 : }
1405 :
1406 : /*
1407 : * 'pteval' can come from a PTE, PMD or PUD. We only check
1408 : * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1409 : * same value on all 3 types.
1410 : */
1411 : static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1412 : {
1413 : unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1414 :
1415 : if (write)
1416 : need_pte_bits |= _PAGE_RW;
1417 :
1418 : if ((pteval & need_pte_bits) != need_pte_bits)
1419 : return 0;
1420 :
1421 : return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1422 : }
1423 :
1424 : #define pte_access_permitted pte_access_permitted
1425 : static inline bool pte_access_permitted(pte_t pte, bool write)
1426 : {
1427 : return __pte_access_permitted(pte_val(pte), write);
1428 : }
1429 :
1430 : #define pmd_access_permitted pmd_access_permitted
1431 : static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1432 : {
1433 : return __pte_access_permitted(pmd_val(pmd), write);
1434 : }
1435 :
1436 : #define pud_access_permitted pud_access_permitted
1437 : static inline bool pud_access_permitted(pud_t pud, bool write)
1438 : {
1439 : return __pte_access_permitted(pud_val(pud), write);
1440 : }
1441 :
1442 : #define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1
1443 : extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot);
1444 :
1445 : static inline bool arch_has_pfn_modify_check(void)
1446 : {
1447 : return boot_cpu_has_bug(X86_BUG_L1TF);
1448 : }
1449 :
1450 : #define arch_has_hw_pte_young arch_has_hw_pte_young
1451 : static inline bool arch_has_hw_pte_young(void)
1452 : {
1453 : return true;
1454 : }
1455 :
1456 : #ifdef CONFIG_XEN_PV
1457 : #define arch_has_hw_nonleaf_pmd_young arch_has_hw_nonleaf_pmd_young
1458 : static inline bool arch_has_hw_nonleaf_pmd_young(void)
1459 : {
1460 : return !cpu_feature_enabled(X86_FEATURE_XENPV);
1461 : }
1462 : #endif
1463 :
1464 : #ifdef CONFIG_PAGE_TABLE_CHECK
1465 : static inline bool pte_user_accessible_page(pte_t pte)
1466 : {
1467 : return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
1468 : }
1469 :
1470 : static inline bool pmd_user_accessible_page(pmd_t pmd)
1471 : {
1472 : return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) && (pmd_val(pmd) & _PAGE_USER);
1473 : }
1474 :
1475 : static inline bool pud_user_accessible_page(pud_t pud)
1476 : {
1477 : return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) && (pud_val(pud) & _PAGE_USER);
1478 : }
1479 : #endif
1480 :
1481 : #endif /* __ASSEMBLY__ */
1482 :
1483 : #endif /* _ASM_X86_PGTABLE_H */
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