1
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
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
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#include <asm/fpu/xstate.h>
27#include <asm/fpu/api.h>
28#include <asm-generic/pgtable_uffd.h>
29
30extern pgd_t early_top_pgt[PTRS_PER_PGD];
31bool __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
32
33void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm);
34void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm,
35 bool user);
36void ptdump_walk_pgd_level_checkwx(void);
37void ptdump_walk_user_pgd_level_checkwx(void);
38
39#ifdef CONFIG_DEBUG_WX
40#define debug_checkwx() ptdump_walk_pgd_level_checkwx()
41#define debug_checkwx_user() ptdump_walk_user_pgd_level_checkwx()
42#else
43#define debug_checkwx() do { } while (0)
44#define debug_checkwx_user() do { } while (0)
45#endif
46
47
48
49
50
51extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
52 __visible;
53#define ZERO_PAGE(vaddr) ((void)(vaddr),virt_to_page(empty_zero_page))
54
55extern spinlock_t pgd_lock;
56extern struct list_head pgd_list;
57
58extern struct mm_struct *pgd_page_get_mm(struct page *page);
59
60extern pmdval_t early_pmd_flags;
61
62#ifdef CONFIG_PARAVIRT_XXL
63#include <asm/paravirt.h>
64#else
65#define set_pte(ptep, pte) native_set_pte(ptep, pte)
66
67#define set_pte_atomic(ptep, pte) \
68 native_set_pte_atomic(ptep, pte)
69
70#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
71
72#ifndef __PAGETABLE_P4D_FOLDED
73#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
74#define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0)
75#endif
76
77#ifndef set_p4d
78# define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
79#endif
80
81#ifndef __PAGETABLE_PUD_FOLDED
82#define p4d_clear(p4d) native_p4d_clear(p4d)
83#endif
84
85#ifndef set_pud
86# define set_pud(pudp, pud) native_set_pud(pudp, pud)
87#endif
88
89#ifndef __PAGETABLE_PUD_FOLDED
90#define pud_clear(pud) native_pud_clear(pud)
91#endif
92
93#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
94#define pmd_clear(pmd) native_pmd_clear(pmd)
95
96#define pgd_val(x) native_pgd_val(x)
97#define __pgd(x) native_make_pgd(x)
98
99#ifndef __PAGETABLE_P4D_FOLDED
100#define p4d_val(x) native_p4d_val(x)
101#define __p4d(x) native_make_p4d(x)
102#endif
103
104#ifndef __PAGETABLE_PUD_FOLDED
105#define pud_val(x) native_pud_val(x)
106#define __pud(x) native_make_pud(x)
107#endif
108
109#ifndef __PAGETABLE_PMD_FOLDED
110#define pmd_val(x) native_pmd_val(x)
111#define __pmd(x) native_make_pmd(x)
112#endif
113
114#define pte_val(x) native_pte_val(x)
115#define __pte(x) native_make_pte(x)
116
117#define arch_end_context_switch(prev) do {} while(0)
118#endif
119
120
121
122
123
124static inline int pte_dirty(pte_t pte)
125{
126 return pte_flags(pte) & _PAGE_DIRTY;
127}
128
129
130static inline u32 read_pkru(void)
131{
132 if (boot_cpu_has(X86_FEATURE_OSPKE))
133 return rdpkru();
134 return 0;
135}
136
137static inline void write_pkru(u32 pkru)
138{
139 struct pkru_state *pk;
140
141 if (!boot_cpu_has(X86_FEATURE_OSPKE))
142 return;
143
144 pk = get_xsave_addr(¤t->thread.fpu.state.xsave, XFEATURE_PKRU);
145
146
147
148
149
150
151 fpregs_lock();
152 if (pk)
153 pk->pkru = pkru;
154 __write_pkru(pkru);
155 fpregs_unlock();
156}
157
158static inline int pte_young(pte_t pte)
159{
160 return pte_flags(pte) & _PAGE_ACCESSED;
161}
162
163static inline int pmd_dirty(pmd_t pmd)
164{
165 return pmd_flags(pmd) & _PAGE_DIRTY;
166}
167
168static inline int pmd_young(pmd_t pmd)
169{
170 return pmd_flags(pmd) & _PAGE_ACCESSED;
171}
172
173static inline int pud_dirty(pud_t pud)
174{
175 return pud_flags(pud) & _PAGE_DIRTY;
176}
177
178static inline int pud_young(pud_t pud)
179{
180 return pud_flags(pud) & _PAGE_ACCESSED;
181}
182
183static inline int pte_write(pte_t pte)
184{
185 return pte_flags(pte) & _PAGE_RW;
186}
187
188static inline int pte_huge(pte_t pte)
189{
190 return pte_flags(pte) & _PAGE_PSE;
191}
192
193static inline int pte_global(pte_t pte)
194{
195 return pte_flags(pte) & _PAGE_GLOBAL;
196}
197
198static inline int pte_exec(pte_t pte)
199{
200 return !(pte_flags(pte) & _PAGE_NX);
201}
202
203static inline int pte_special(pte_t pte)
204{
205 return pte_flags(pte) & _PAGE_SPECIAL;
206}
207
208
209
210static inline u64 protnone_mask(u64 val);
211
212static inline unsigned long pte_pfn(pte_t pte)
213{
214 phys_addr_t pfn = pte_val(pte);
215 pfn ^= protnone_mask(pfn);
216 return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT;
217}
218
219static inline unsigned long pmd_pfn(pmd_t pmd)
220{
221 phys_addr_t pfn = pmd_val(pmd);
222 pfn ^= protnone_mask(pfn);
223 return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
224}
225
226static inline unsigned long pud_pfn(pud_t pud)
227{
228 phys_addr_t pfn = pud_val(pud);
229 pfn ^= protnone_mask(pfn);
230 return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT;
231}
232
233static inline unsigned long p4d_pfn(p4d_t p4d)
234{
235 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
236}
237
238static inline unsigned long pgd_pfn(pgd_t pgd)
239{
240 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
241}
242
243#define p4d_leaf p4d_large
244static inline int p4d_large(p4d_t p4d)
245{
246
247 return 0;
248}
249
250#define pte_page(pte) pfn_to_page(pte_pfn(pte))
251
252#define pmd_leaf pmd_large
253static inline int pmd_large(pmd_t pte)
254{
255 return pmd_flags(pte) & _PAGE_PSE;
256}
257
258#ifdef CONFIG_TRANSPARENT_HUGEPAGE
259
260static inline int pmd_trans_huge(pmd_t pmd)
261{
262 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
263}
264
265#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
266static inline int pud_trans_huge(pud_t pud)
267{
268 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
269}
270#endif
271
272#define has_transparent_hugepage has_transparent_hugepage
273static inline int has_transparent_hugepage(void)
274{
275 return boot_cpu_has(X86_FEATURE_PSE);
276}
277
278#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
279static inline int pmd_devmap(pmd_t pmd)
280{
281 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
282}
283
284#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
285static inline int pud_devmap(pud_t pud)
286{
287 return !!(pud_val(pud) & _PAGE_DEVMAP);
288}
289#else
290static inline int pud_devmap(pud_t pud)
291{
292 return 0;
293}
294#endif
295
296static inline int pgd_devmap(pgd_t pgd)
297{
298 return 0;
299}
300#endif
301#endif
302
303static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
304{
305 pteval_t v = native_pte_val(pte);
306
307 return native_make_pte(v | set);
308}
309
310static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
311{
312 pteval_t v = native_pte_val(pte);
313
314 return native_make_pte(v & ~clear);
315}
316
317#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
318static inline int pte_uffd_wp(pte_t pte)
319{
320 return pte_flags(pte) & _PAGE_UFFD_WP;
321}
322
323static inline pte_t pte_mkuffd_wp(pte_t pte)
324{
325 return pte_set_flags(pte, _PAGE_UFFD_WP);
326}
327
328static inline pte_t pte_clear_uffd_wp(pte_t pte)
329{
330 return pte_clear_flags(pte, _PAGE_UFFD_WP);
331}
332#endif
333
334static inline pte_t pte_mkclean(pte_t pte)
335{
336 return pte_clear_flags(pte, _PAGE_DIRTY);
337}
338
339static inline pte_t pte_mkold(pte_t pte)
340{
341 return pte_clear_flags(pte, _PAGE_ACCESSED);
342}
343
344static inline pte_t pte_wrprotect(pte_t pte)
345{
346 return pte_clear_flags(pte, _PAGE_RW);
347}
348
349static inline pte_t pte_mkexec(pte_t pte)
350{
351 return pte_clear_flags(pte, _PAGE_NX);
352}
353
354static inline pte_t pte_mkdirty(pte_t pte)
355{
356 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
357}
358
359static inline pte_t pte_mkyoung(pte_t pte)
360{
361 return pte_set_flags(pte, _PAGE_ACCESSED);
362}
363
364static inline pte_t pte_mkwrite(pte_t pte)
365{
366 return pte_set_flags(pte, _PAGE_RW);
367}
368
369static inline pte_t pte_mkhuge(pte_t pte)
370{
371 return pte_set_flags(pte, _PAGE_PSE);
372}
373
374static inline pte_t pte_clrhuge(pte_t pte)
375{
376 return pte_clear_flags(pte, _PAGE_PSE);
377}
378
379static inline pte_t pte_mkglobal(pte_t pte)
380{
381 return pte_set_flags(pte, _PAGE_GLOBAL);
382}
383
384static inline pte_t pte_clrglobal(pte_t pte)
385{
386 return pte_clear_flags(pte, _PAGE_GLOBAL);
387}
388
389static inline pte_t pte_mkspecial(pte_t pte)
390{
391 return pte_set_flags(pte, _PAGE_SPECIAL);
392}
393
394static inline pte_t pte_mkdevmap(pte_t pte)
395{
396 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
397}
398
399static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
400{
401 pmdval_t v = native_pmd_val(pmd);
402
403 return native_make_pmd(v | set);
404}
405
406static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
407{
408 pmdval_t v = native_pmd_val(pmd);
409
410 return native_make_pmd(v & ~clear);
411}
412
413#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
414static inline int pmd_uffd_wp(pmd_t pmd)
415{
416 return pmd_flags(pmd) & _PAGE_UFFD_WP;
417}
418
419static inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
420{
421 return pmd_set_flags(pmd, _PAGE_UFFD_WP);
422}
423
424static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
425{
426 return pmd_clear_flags(pmd, _PAGE_UFFD_WP);
427}
428#endif
429
430static inline pmd_t pmd_mkold(pmd_t pmd)
431{
432 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
433}
434
435static inline pmd_t pmd_mkclean(pmd_t pmd)
436{
437 return pmd_clear_flags(pmd, _PAGE_DIRTY);
438}
439
440static inline pmd_t pmd_wrprotect(pmd_t pmd)
441{
442 return pmd_clear_flags(pmd, _PAGE_RW);
443}
444
445static inline pmd_t pmd_mkdirty(pmd_t pmd)
446{
447 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
448}
449
450static inline pmd_t pmd_mkdevmap(pmd_t pmd)
451{
452 return pmd_set_flags(pmd, _PAGE_DEVMAP);
453}
454
455static inline pmd_t pmd_mkhuge(pmd_t pmd)
456{
457 return pmd_set_flags(pmd, _PAGE_PSE);
458}
459
460static inline pmd_t pmd_mkyoung(pmd_t pmd)
461{
462 return pmd_set_flags(pmd, _PAGE_ACCESSED);
463}
464
465static inline pmd_t pmd_mkwrite(pmd_t pmd)
466{
467 return pmd_set_flags(pmd, _PAGE_RW);
468}
469
470static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
471{
472 pudval_t v = native_pud_val(pud);
473
474 return native_make_pud(v | set);
475}
476
477static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
478{
479 pudval_t v = native_pud_val(pud);
480
481 return native_make_pud(v & ~clear);
482}
483
484static inline pud_t pud_mkold(pud_t pud)
485{
486 return pud_clear_flags(pud, _PAGE_ACCESSED);
487}
488
489static inline pud_t pud_mkclean(pud_t pud)
490{
491 return pud_clear_flags(pud, _PAGE_DIRTY);
492}
493
494static inline pud_t pud_wrprotect(pud_t pud)
495{
496 return pud_clear_flags(pud, _PAGE_RW);
497}
498
499static inline pud_t pud_mkdirty(pud_t pud)
500{
501 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
502}
503
504static inline pud_t pud_mkdevmap(pud_t pud)
505{
506 return pud_set_flags(pud, _PAGE_DEVMAP);
507}
508
509static inline pud_t pud_mkhuge(pud_t pud)
510{
511 return pud_set_flags(pud, _PAGE_PSE);
512}
513
514static inline pud_t pud_mkyoung(pud_t pud)
515{
516 return pud_set_flags(pud, _PAGE_ACCESSED);
517}
518
519static inline pud_t pud_mkwrite(pud_t pud)
520{
521 return pud_set_flags(pud, _PAGE_RW);
522}
523
524#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
525static inline int pte_soft_dirty(pte_t pte)
526{
527 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
528}
529
530static inline int pmd_soft_dirty(pmd_t pmd)
531{
532 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
533}
534
535static inline int pud_soft_dirty(pud_t pud)
536{
537 return pud_flags(pud) & _PAGE_SOFT_DIRTY;
538}
539
540static inline pte_t pte_mksoft_dirty(pte_t pte)
541{
542 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
543}
544
545static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
546{
547 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
548}
549
550static inline pud_t pud_mksoft_dirty(pud_t pud)
551{
552 return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
553}
554
555static inline pte_t pte_clear_soft_dirty(pte_t pte)
556{
557 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
558}
559
560static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
561{
562 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
563}
564
565static inline pud_t pud_clear_soft_dirty(pud_t pud)
566{
567 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
568}
569
570#endif
571
572
573
574
575
576static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
577{
578 pgprotval_t protval = pgprot_val(pgprot);
579
580 if (protval & _PAGE_PRESENT)
581 protval &= __supported_pte_mask;
582
583 return protval;
584}
585
586static inline pgprotval_t check_pgprot(pgprot_t pgprot)
587{
588 pgprotval_t massaged_val = massage_pgprot(pgprot);
589
590
591#ifdef CONFIG_DEBUG_VM
592 WARN_ONCE(pgprot_val(pgprot) != massaged_val,
593 "attempted to set unsupported pgprot: %016llx "
594 "bits: %016llx supported: %016llx\n",
595 (u64)pgprot_val(pgprot),
596 (u64)pgprot_val(pgprot) ^ massaged_val,
597 (u64)__supported_pte_mask);
598#endif
599
600 return massaged_val;
601}
602
603static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
604{
605 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
606 pfn ^= protnone_mask(pgprot_val(pgprot));
607 pfn &= PTE_PFN_MASK;
608 return __pte(pfn | check_pgprot(pgprot));
609}
610
611static inline pmd_t pfn_pmd(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_PMD_PAGE_MASK;
616 return __pmd(pfn | check_pgprot(pgprot));
617}
618
619static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
620{
621 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
622 pfn ^= protnone_mask(pgprot_val(pgprot));
623 pfn &= PHYSICAL_PUD_PAGE_MASK;
624 return __pud(pfn | check_pgprot(pgprot));
625}
626
627static inline pmd_t pmd_mkinvalid(pmd_t pmd)
628{
629 return pfn_pmd(pmd_pfn(pmd),
630 __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
631}
632
633static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
634
635static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
636{
637 pteval_t val = pte_val(pte), oldval = val;
638
639
640
641
642
643 val &= _PAGE_CHG_MASK;
644 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK;
645 val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
646 return __pte(val);
647}
648
649static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
650{
651 pmdval_t val = pmd_val(pmd), oldval = val;
652
653 val &= _HPAGE_CHG_MASK;
654 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK;
655 val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
656 return __pmd(val);
657}
658
659
660
661
662
663#define pgprot_modify pgprot_modify
664static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
665{
666 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
667 pgprotval_t addbits = pgprot_val(newprot) & ~_PAGE_CHG_MASK;
668 return __pgprot(preservebits | addbits);
669}
670
671#define pte_pgprot(x) __pgprot(pte_flags(x))
672#define pmd_pgprot(x) __pgprot(pmd_flags(x))
673#define pud_pgprot(x) __pgprot(pud_flags(x))
674#define p4d_pgprot(x) __pgprot(p4d_flags(x))
675
676#define canon_pgprot(p) __pgprot(massage_pgprot(p))
677
678static inline pgprot_t arch_filter_pgprot(pgprot_t prot)
679{
680 return canon_pgprot(prot);
681}
682
683static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
684 enum page_cache_mode pcm,
685 enum page_cache_mode new_pcm)
686{
687
688
689
690 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
691 return 1;
692
693
694
695
696
697
698
699
700
701 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
702 new_pcm == _PAGE_CACHE_MODE_WB) ||
703 (pcm == _PAGE_CACHE_MODE_WC &&
704 new_pcm == _PAGE_CACHE_MODE_WB) ||
705 (pcm == _PAGE_CACHE_MODE_WT &&
706 new_pcm == _PAGE_CACHE_MODE_WB) ||
707 (pcm == _PAGE_CACHE_MODE_WT &&
708 new_pcm == _PAGE_CACHE_MODE_WC)) {
709 return 0;
710 }
711
712 return 1;
713}
714
715pmd_t *populate_extra_pmd(unsigned long vaddr);
716pte_t *populate_extra_pte(unsigned long vaddr);
717
718#ifdef CONFIG_PAGE_TABLE_ISOLATION
719pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd);
720
721
722
723
724
725
726static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
727{
728 if (!static_cpu_has(X86_FEATURE_PTI))
729 return pgd;
730 return __pti_set_user_pgtbl(pgdp, pgd);
731}
732#else
733static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
734{
735 return pgd;
736}
737#endif
738
739#endif
740
741
742#ifdef CONFIG_X86_32
743# include <asm/pgtable_32.h>
744#else
745# include <asm/pgtable_64.h>
746#endif
747
748#ifndef __ASSEMBLY__
749#include <linux/mm_types.h>
750#include <linux/mmdebug.h>
751#include <linux/log2.h>
752#include <asm/fixmap.h>
753
754static inline int pte_none(pte_t pte)
755{
756 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
757}
758
759#define __HAVE_ARCH_PTE_SAME
760static inline int pte_same(pte_t a, pte_t b)
761{
762 return a.pte == b.pte;
763}
764
765static inline int pte_present(pte_t a)
766{
767 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
768}
769
770#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
771static inline int pte_devmap(pte_t a)
772{
773 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
774}
775#endif
776
777#define pte_accessible pte_accessible
778static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
779{
780 if (pte_flags(a) & _PAGE_PRESENT)
781 return true;
782
783 if ((pte_flags(a) & _PAGE_PROTNONE) &&
784 mm_tlb_flush_pending(mm))
785 return true;
786
787 return false;
788}
789
790static inline int pmd_present(pmd_t pmd)
791{
792
793
794
795
796
797
798 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
799}
800
801#ifdef CONFIG_NUMA_BALANCING
802
803
804
805
806static inline int pte_protnone(pte_t pte)
807{
808 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
809 == _PAGE_PROTNONE;
810}
811
812static inline int pmd_protnone(pmd_t pmd)
813{
814 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
815 == _PAGE_PROTNONE;
816}
817#endif
818
819static inline int pmd_none(pmd_t pmd)
820{
821
822
823 unsigned long val = native_pmd_val(pmd);
824 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
825}
826
827static inline unsigned long pmd_page_vaddr(pmd_t pmd)
828{
829 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
830}
831
832
833
834
835
836#define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
837
838
839
840
841
842
843
844
845#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
846
847static inline int pmd_bad(pmd_t pmd)
848{
849 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
850}
851
852static inline unsigned long pages_to_mb(unsigned long npg)
853{
854 return npg >> (20 - PAGE_SHIFT);
855}
856
857#if CONFIG_PGTABLE_LEVELS > 2
858static inline int pud_none(pud_t pud)
859{
860 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
861}
862
863static inline int pud_present(pud_t pud)
864{
865 return pud_flags(pud) & _PAGE_PRESENT;
866}
867
868static inline unsigned long pud_page_vaddr(pud_t pud)
869{
870 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
871}
872
873
874
875
876
877#define pud_page(pud) pfn_to_page(pud_pfn(pud))
878
879#define pud_leaf pud_large
880static inline int pud_large(pud_t pud)
881{
882 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
883 (_PAGE_PSE | _PAGE_PRESENT);
884}
885
886static inline int pud_bad(pud_t pud)
887{
888 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
889}
890#else
891#define pud_leaf pud_large
892static inline int pud_large(pud_t pud)
893{
894 return 0;
895}
896#endif
897
898#if CONFIG_PGTABLE_LEVELS > 3
899static inline int p4d_none(p4d_t p4d)
900{
901 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
902}
903
904static inline int p4d_present(p4d_t p4d)
905{
906 return p4d_flags(p4d) & _PAGE_PRESENT;
907}
908
909static inline unsigned long p4d_page_vaddr(p4d_t p4d)
910{
911 return (unsigned long)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
912}
913
914
915
916
917
918#define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
919
920static inline int p4d_bad(p4d_t p4d)
921{
922 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER;
923
924 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
925 ignore_flags |= _PAGE_NX;
926
927 return (p4d_flags(p4d) & ~ignore_flags) != 0;
928}
929#endif
930
931static inline unsigned long p4d_index(unsigned long address)
932{
933 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
934}
935
936#if CONFIG_PGTABLE_LEVELS > 4
937static inline int pgd_present(pgd_t pgd)
938{
939 if (!pgtable_l5_enabled())
940 return 1;
941 return pgd_flags(pgd) & _PAGE_PRESENT;
942}
943
944static inline unsigned long pgd_page_vaddr(pgd_t pgd)
945{
946 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
947}
948
949
950
951
952
953#define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
954
955
956static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
957{
958 if (!pgtable_l5_enabled())
959 return (p4d_t *)pgd;
960 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
961}
962
963static inline int pgd_bad(pgd_t pgd)
964{
965 unsigned long ignore_flags = _PAGE_USER;
966
967 if (!pgtable_l5_enabled())
968 return 0;
969
970 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
971 ignore_flags |= _PAGE_NX;
972
973 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
974}
975
976static inline int pgd_none(pgd_t pgd)
977{
978 if (!pgtable_l5_enabled())
979 return 0;
980
981
982
983
984
985
986 return !native_pgd_val(pgd);
987}
988#endif
989
990#endif
991
992#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
993#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
994
995#ifndef __ASSEMBLY__
996
997extern int direct_gbpages;
998void init_mem_mapping(void);
999void early_alloc_pgt_buf(void);
1000extern void memblock_find_dma_reserve(void);
1001void __init poking_init(void);
1002unsigned long init_memory_mapping(unsigned long start,
1003 unsigned long end, pgprot_t prot);
1004
1005#ifdef CONFIG_X86_64
1006extern pgd_t trampoline_pgd_entry;
1007#endif
1008
1009
1010static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
1011{
1012 pte_t res = *ptep;
1013
1014
1015 native_pte_clear(NULL, 0, ptep);
1016 return res;
1017}
1018
1019static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
1020{
1021 pmd_t res = *pmdp;
1022
1023 native_pmd_clear(pmdp);
1024 return res;
1025}
1026
1027static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
1028{
1029 pud_t res = *pudp;
1030
1031 native_pud_clear(pudp);
1032 return res;
1033}
1034
1035static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
1036 pte_t *ptep, pte_t pte)
1037{
1038 set_pte(ptep, pte);
1039}
1040
1041static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1042 pmd_t *pmdp, pmd_t pmd)
1043{
1044 set_pmd(pmdp, pmd);
1045}
1046
1047static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
1048 pud_t *pudp, pud_t pud)
1049{
1050 native_set_pud(pudp, pud);
1051}
1052
1053
1054
1055
1056
1057
1058
1059
1060struct vm_area_struct;
1061
1062#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1063extern int ptep_set_access_flags(struct vm_area_struct *vma,
1064 unsigned long address, pte_t *ptep,
1065 pte_t entry, int dirty);
1066
1067#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1068extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1069 unsigned long addr, pte_t *ptep);
1070
1071#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1072extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1073 unsigned long address, pte_t *ptep);
1074
1075#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1076static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1077 pte_t *ptep)
1078{
1079 pte_t pte = native_ptep_get_and_clear(ptep);
1080 return pte;
1081}
1082
1083#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1084static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1085 unsigned long addr, pte_t *ptep,
1086 int full)
1087{
1088 pte_t pte;
1089 if (full) {
1090
1091
1092
1093
1094 pte = native_local_ptep_get_and_clear(ptep);
1095 } else {
1096 pte = ptep_get_and_clear(mm, addr, ptep);
1097 }
1098 return pte;
1099}
1100
1101#define __HAVE_ARCH_PTEP_SET_WRPROTECT
1102static inline void ptep_set_wrprotect(struct mm_struct *mm,
1103 unsigned long addr, pte_t *ptep)
1104{
1105 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1106}
1107
1108#define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1109
1110#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1111
1112#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1113extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1114 unsigned long address, pmd_t *pmdp,
1115 pmd_t entry, int dirty);
1116extern int pudp_set_access_flags(struct vm_area_struct *vma,
1117 unsigned long address, pud_t *pudp,
1118 pud_t entry, int dirty);
1119
1120#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1121extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1122 unsigned long addr, pmd_t *pmdp);
1123extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1124 unsigned long addr, pud_t *pudp);
1125
1126#define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1127extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1128 unsigned long address, pmd_t *pmdp);
1129
1130
1131#define pmd_write pmd_write
1132static inline int pmd_write(pmd_t pmd)
1133{
1134 return pmd_flags(pmd) & _PAGE_RW;
1135}
1136
1137#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1138static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1139 pmd_t *pmdp)
1140{
1141 return native_pmdp_get_and_clear(pmdp);
1142}
1143
1144#define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1145static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1146 unsigned long addr, pud_t *pudp)
1147{
1148 return native_pudp_get_and_clear(pudp);
1149}
1150
1151#define __HAVE_ARCH_PMDP_SET_WRPROTECT
1152static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1153 unsigned long addr, pmd_t *pmdp)
1154{
1155 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1156}
1157
1158#define pud_write pud_write
1159static inline int pud_write(pud_t pud)
1160{
1161 return pud_flags(pud) & _PAGE_RW;
1162}
1163
1164#ifndef pmdp_establish
1165#define pmdp_establish pmdp_establish
1166static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1167 unsigned long address, pmd_t *pmdp, pmd_t pmd)
1168{
1169 if (IS_ENABLED(CONFIG_SMP)) {
1170 return xchg(pmdp, pmd);
1171 } else {
1172 pmd_t old = *pmdp;
1173 WRITE_ONCE(*pmdp, pmd);
1174 return old;
1175 }
1176}
1177#endif
1178
1179
1180
1181
1182
1183
1184
1185static inline bool pgdp_maps_userspace(void *__ptr)
1186{
1187 unsigned long ptr = (unsigned long)__ptr;
1188
1189 return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
1190}
1191
1192#define pgd_leaf pgd_large
1193static inline int pgd_large(pgd_t pgd) { return 0; }
1194
1195#ifdef CONFIG_PAGE_TABLE_ISOLATION
1196
1197
1198
1199
1200
1201
1202#define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
1203
1204
1205
1206
1207
1208static inline void *ptr_set_bit(void *ptr, int bit)
1209{
1210 unsigned long __ptr = (unsigned long)ptr;
1211
1212 __ptr |= BIT(bit);
1213 return (void *)__ptr;
1214}
1215static inline void *ptr_clear_bit(void *ptr, int bit)
1216{
1217 unsigned long __ptr = (unsigned long)ptr;
1218
1219 __ptr &= ~BIT(bit);
1220 return (void *)__ptr;
1221}
1222
1223static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
1224{
1225 return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1226}
1227
1228static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
1229{
1230 return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1231}
1232
1233static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
1234{
1235 return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1236}
1237
1238static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
1239{
1240 return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1241}
1242#endif
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1255{
1256 memcpy(dst, src, count * sizeof(pgd_t));
1257#ifdef CONFIG_PAGE_TABLE_ISOLATION
1258 if (!static_cpu_has(X86_FEATURE_PTI))
1259 return;
1260
1261 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1262 count * sizeof(pgd_t));
1263#endif
1264}
1265
1266#define PTE_SHIFT ilog2(PTRS_PER_PTE)
1267static inline int page_level_shift(enum pg_level level)
1268{
1269 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1270}
1271static inline unsigned long page_level_size(enum pg_level level)
1272{
1273 return 1UL << page_level_shift(level);
1274}
1275static inline unsigned long page_level_mask(enum pg_level level)
1276{
1277 return ~(page_level_size(level) - 1);
1278}
1279
1280
1281
1282
1283
1284static inline void update_mmu_cache(struct vm_area_struct *vma,
1285 unsigned long addr, pte_t *ptep)
1286{
1287}
1288static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1289 unsigned long addr, pmd_t *pmd)
1290{
1291}
1292static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1293 unsigned long addr, pud_t *pud)
1294{
1295}
1296
1297#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1298static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1299{
1300 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1301}
1302
1303static inline int pte_swp_soft_dirty(pte_t pte)
1304{
1305 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1306}
1307
1308static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1309{
1310 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1311}
1312
1313#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1314static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1315{
1316 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1317}
1318
1319static inline int pmd_swp_soft_dirty(pmd_t pmd)
1320{
1321 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1322}
1323
1324static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1325{
1326 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1327}
1328#endif
1329#endif
1330
1331#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
1332static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
1333{
1334 return pte_set_flags(pte, _PAGE_SWP_UFFD_WP);
1335}
1336
1337static inline int pte_swp_uffd_wp(pte_t pte)
1338{
1339 return pte_flags(pte) & _PAGE_SWP_UFFD_WP;
1340}
1341
1342static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
1343{
1344 return pte_clear_flags(pte, _PAGE_SWP_UFFD_WP);
1345}
1346
1347static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
1348{
1349 return pmd_set_flags(pmd, _PAGE_SWP_UFFD_WP);
1350}
1351
1352static inline int pmd_swp_uffd_wp(pmd_t pmd)
1353{
1354 return pmd_flags(pmd) & _PAGE_SWP_UFFD_WP;
1355}
1356
1357static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
1358{
1359 return pmd_clear_flags(pmd, _PAGE_SWP_UFFD_WP);
1360}
1361#endif
1362
1363#define PKRU_AD_BIT 0x1
1364#define PKRU_WD_BIT 0x2
1365#define PKRU_BITS_PER_PKEY 2
1366
1367#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1368extern u32 init_pkru_value;
1369#else
1370#define init_pkru_value 0
1371#endif
1372
1373static inline bool __pkru_allows_read(u32 pkru, u16 pkey)
1374{
1375 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1376 return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits));
1377}
1378
1379static inline bool __pkru_allows_write(u32 pkru, u16 pkey)
1380{
1381 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1382
1383
1384
1385
1386 return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits));
1387}
1388
1389static inline u16 pte_flags_pkey(unsigned long pte_flags)
1390{
1391#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1392
1393 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1394#else
1395 return 0;
1396#endif
1397}
1398
1399static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1400{
1401 u32 pkru = read_pkru();
1402
1403 if (!__pkru_allows_read(pkru, pkey))
1404 return false;
1405 if (write && !__pkru_allows_write(pkru, pkey))
1406 return false;
1407
1408 return true;
1409}
1410
1411
1412
1413
1414
1415
1416static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1417{
1418 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1419
1420 if (write)
1421 need_pte_bits |= _PAGE_RW;
1422
1423 if ((pteval & need_pte_bits) != need_pte_bits)
1424 return 0;
1425
1426 return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1427}
1428
1429#define pte_access_permitted pte_access_permitted
1430static inline bool pte_access_permitted(pte_t pte, bool write)
1431{
1432 return __pte_access_permitted(pte_val(pte), write);
1433}
1434
1435#define pmd_access_permitted pmd_access_permitted
1436static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1437{
1438 return __pte_access_permitted(pmd_val(pmd), write);
1439}
1440
1441#define pud_access_permitted pud_access_permitted
1442static inline bool pud_access_permitted(pud_t pud, bool write)
1443{
1444 return __pte_access_permitted(pud_val(pud), write);
1445}
1446
1447#define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1
1448extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot);
1449
1450static inline bool arch_has_pfn_modify_check(void)
1451{
1452 return boot_cpu_has_bug(X86_BUG_L1TF);
1453}
1454
1455#define arch_faults_on_old_pte arch_faults_on_old_pte
1456static inline bool arch_faults_on_old_pte(void)
1457{
1458 return false;
1459}
1460
1461#endif
1462
1463#endif
1464