1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGTABLE_H
3 #define _ASM_X86_PGTABLE_H
5 #include <linux/mem_encrypt.h>
7 #include <asm/pgtable_types.h>
10 * Macro to mark a page protection value as UC-
12 #define pgprot_noncached(prot) \
13 ((boot_cpu_data.x86 > 3) \
14 ? (__pgprot(pgprot_val(prot) | \
15 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \
19 #include <linux/spinlock.h>
20 #include <asm/x86_init.h>
22 #include <asm/fpu/api.h>
24 #include <asm-generic/pgtable_uffd.h>
25 #include <linux/page_table_check.h>
27 extern pgd_t early_top_pgt[PTRS_PER_PGD];
28 bool __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
30 void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm);
31 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm,
33 void ptdump_walk_pgd_level_checkwx(void);
34 void ptdump_walk_user_pgd_level_checkwx(void);
37 * Macros to add or remove encryption attribute
39 #define pgprot_encrypted(prot) __pgprot(cc_mkenc(pgprot_val(prot)))
40 #define pgprot_decrypted(prot) __pgprot(cc_mkdec(pgprot_val(prot)))
42 #ifdef CONFIG_DEBUG_WX
43 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
44 #define debug_checkwx_user() ptdump_walk_user_pgd_level_checkwx()
46 #define debug_checkwx() do { } while (0)
47 #define debug_checkwx_user() do { } while (0)
51 * ZERO_PAGE is a global shared page that is always zero: used
52 * for zero-mapped memory areas etc..
54 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
56 #define ZERO_PAGE(vaddr) ((void)(vaddr),virt_to_page(empty_zero_page))
58 extern spinlock_t pgd_lock;
59 extern struct list_head pgd_list;
61 extern struct mm_struct *pgd_page_get_mm(struct page *page);
63 extern pmdval_t early_pmd_flags;
65 #ifdef CONFIG_PARAVIRT_XXL
66 #include <asm/paravirt.h>
67 #else /* !CONFIG_PARAVIRT_XXL */
68 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
70 #define set_pte_atomic(ptep, pte) \
71 native_set_pte_atomic(ptep, pte)
73 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
75 #ifndef __PAGETABLE_P4D_FOLDED
76 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
77 #define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0)
81 # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
84 #ifndef __PAGETABLE_PUD_FOLDED
85 #define p4d_clear(p4d) native_p4d_clear(p4d)
89 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
92 #ifndef __PAGETABLE_PUD_FOLDED
93 #define pud_clear(pud) native_pud_clear(pud)
96 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
97 #define pmd_clear(pmd) native_pmd_clear(pmd)
99 #define pgd_val(x) native_pgd_val(x)
100 #define __pgd(x) native_make_pgd(x)
102 #ifndef __PAGETABLE_P4D_FOLDED
103 #define p4d_val(x) native_p4d_val(x)
104 #define __p4d(x) native_make_p4d(x)
107 #ifndef __PAGETABLE_PUD_FOLDED
108 #define pud_val(x) native_pud_val(x)
109 #define __pud(x) native_make_pud(x)
112 #ifndef __PAGETABLE_PMD_FOLDED
113 #define pmd_val(x) native_pmd_val(x)
114 #define __pmd(x) native_make_pmd(x)
117 #define pte_val(x) native_pte_val(x)
118 #define __pte(x) native_make_pte(x)
120 #define arch_end_context_switch(prev) do {} while(0)
121 #endif /* CONFIG_PARAVIRT_XXL */
124 * The following only work if pte_present() is true.
125 * Undefined behaviour if not..
127 static inline int pte_dirty(pte_t pte)
129 return pte_flags(pte) & _PAGE_DIRTY;
132 static inline int pte_young(pte_t pte)
134 return pte_flags(pte) & _PAGE_ACCESSED;
137 static inline int pmd_dirty(pmd_t pmd)
139 return pmd_flags(pmd) & _PAGE_DIRTY;
142 static inline int pmd_young(pmd_t pmd)
144 return pmd_flags(pmd) & _PAGE_ACCESSED;
147 static inline int pud_dirty(pud_t pud)
149 return pud_flags(pud) & _PAGE_DIRTY;
152 static inline int pud_young(pud_t pud)
154 return pud_flags(pud) & _PAGE_ACCESSED;
157 static inline int pte_write(pte_t pte)
159 return pte_flags(pte) & _PAGE_RW;
162 static inline int pte_huge(pte_t pte)
164 return pte_flags(pte) & _PAGE_PSE;
167 static inline int pte_global(pte_t pte)
169 return pte_flags(pte) & _PAGE_GLOBAL;
172 static inline int pte_exec(pte_t pte)
174 return !(pte_flags(pte) & _PAGE_NX);
177 static inline int pte_special(pte_t pte)
179 return pte_flags(pte) & _PAGE_SPECIAL;
182 /* Entries that were set to PROT_NONE are inverted */
184 static inline u64 protnone_mask(u64 val);
186 static inline unsigned long pte_pfn(pte_t pte)
188 phys_addr_t pfn = pte_val(pte);
189 pfn ^= protnone_mask(pfn);
190 return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT;
193 static inline unsigned long pmd_pfn(pmd_t pmd)
195 phys_addr_t pfn = pmd_val(pmd);
196 pfn ^= protnone_mask(pfn);
197 return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
200 static inline unsigned long pud_pfn(pud_t pud)
202 phys_addr_t pfn = pud_val(pud);
203 pfn ^= protnone_mask(pfn);
204 return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT;
207 static inline unsigned long p4d_pfn(p4d_t p4d)
209 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
212 static inline unsigned long pgd_pfn(pgd_t pgd)
214 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
217 #define p4d_leaf p4d_large
218 static inline int p4d_large(p4d_t p4d)
220 /* No 512 GiB pages yet */
224 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
226 #define pmd_leaf pmd_large
227 static inline int pmd_large(pmd_t pte)
229 return pmd_flags(pte) & _PAGE_PSE;
232 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
233 /* NOTE: when predicate huge page, consider also pmd_devmap, or use pmd_large */
234 static inline int pmd_trans_huge(pmd_t pmd)
236 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
239 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
240 static inline int pud_trans_huge(pud_t pud)
242 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
246 #define has_transparent_hugepage has_transparent_hugepage
247 static inline int has_transparent_hugepage(void)
249 return boot_cpu_has(X86_FEATURE_PSE);
252 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
253 static inline int pmd_devmap(pmd_t pmd)
255 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
258 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
259 static inline int pud_devmap(pud_t pud)
261 return !!(pud_val(pud) & _PAGE_DEVMAP);
264 static inline int pud_devmap(pud_t pud)
270 static inline int pgd_devmap(pgd_t pgd)
275 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
277 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
279 pteval_t v = native_pte_val(pte);
281 return native_make_pte(v | set);
284 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
286 pteval_t v = native_pte_val(pte);
288 return native_make_pte(v & ~clear);
291 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
292 static inline int pte_uffd_wp(pte_t pte)
294 return pte_flags(pte) & _PAGE_UFFD_WP;
297 static inline pte_t pte_mkuffd_wp(pte_t pte)
299 return pte_set_flags(pte, _PAGE_UFFD_WP);
302 static inline pte_t pte_clear_uffd_wp(pte_t pte)
304 return pte_clear_flags(pte, _PAGE_UFFD_WP);
306 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
308 static inline pte_t pte_mkclean(pte_t pte)
310 return pte_clear_flags(pte, _PAGE_DIRTY);
313 static inline pte_t pte_mkold(pte_t pte)
315 return pte_clear_flags(pte, _PAGE_ACCESSED);
318 static inline pte_t pte_wrprotect(pte_t pte)
320 return pte_clear_flags(pte, _PAGE_RW);
323 static inline pte_t pte_mkexec(pte_t pte)
325 return pte_clear_flags(pte, _PAGE_NX);
328 static inline pte_t pte_mkdirty(pte_t pte)
330 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
333 static inline pte_t pte_mkyoung(pte_t pte)
335 return pte_set_flags(pte, _PAGE_ACCESSED);
338 static inline pte_t pte_mkwrite(pte_t pte)
340 return pte_set_flags(pte, _PAGE_RW);
343 static inline pte_t pte_mkhuge(pte_t pte)
345 return pte_set_flags(pte, _PAGE_PSE);
348 static inline pte_t pte_clrhuge(pte_t pte)
350 return pte_clear_flags(pte, _PAGE_PSE);
353 static inline pte_t pte_mkglobal(pte_t pte)
355 return pte_set_flags(pte, _PAGE_GLOBAL);
358 static inline pte_t pte_clrglobal(pte_t pte)
360 return pte_clear_flags(pte, _PAGE_GLOBAL);
363 static inline pte_t pte_mkspecial(pte_t pte)
365 return pte_set_flags(pte, _PAGE_SPECIAL);
368 static inline pte_t pte_mkdevmap(pte_t pte)
370 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
373 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
375 pmdval_t v = native_pmd_val(pmd);
377 return native_make_pmd(v | set);
380 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
382 pmdval_t v = native_pmd_val(pmd);
384 return native_make_pmd(v & ~clear);
387 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
388 static inline int pmd_uffd_wp(pmd_t pmd)
390 return pmd_flags(pmd) & _PAGE_UFFD_WP;
393 static inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
395 return pmd_set_flags(pmd, _PAGE_UFFD_WP);
398 static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
400 return pmd_clear_flags(pmd, _PAGE_UFFD_WP);
402 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
404 static inline pmd_t pmd_mkold(pmd_t pmd)
406 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
409 static inline pmd_t pmd_mkclean(pmd_t pmd)
411 return pmd_clear_flags(pmd, _PAGE_DIRTY);
414 static inline pmd_t pmd_wrprotect(pmd_t pmd)
416 return pmd_clear_flags(pmd, _PAGE_RW);
419 static inline pmd_t pmd_mkdirty(pmd_t pmd)
421 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
424 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
426 return pmd_set_flags(pmd, _PAGE_DEVMAP);
429 static inline pmd_t pmd_mkhuge(pmd_t pmd)
431 return pmd_set_flags(pmd, _PAGE_PSE);
434 static inline pmd_t pmd_mkyoung(pmd_t pmd)
436 return pmd_set_flags(pmd, _PAGE_ACCESSED);
439 static inline pmd_t pmd_mkwrite(pmd_t pmd)
441 return pmd_set_flags(pmd, _PAGE_RW);
444 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
446 pudval_t v = native_pud_val(pud);
448 return native_make_pud(v | set);
451 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
453 pudval_t v = native_pud_val(pud);
455 return native_make_pud(v & ~clear);
458 static inline pud_t pud_mkold(pud_t pud)
460 return pud_clear_flags(pud, _PAGE_ACCESSED);
463 static inline pud_t pud_mkclean(pud_t pud)
465 return pud_clear_flags(pud, _PAGE_DIRTY);
468 static inline pud_t pud_wrprotect(pud_t pud)
470 return pud_clear_flags(pud, _PAGE_RW);
473 static inline pud_t pud_mkdirty(pud_t pud)
475 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
478 static inline pud_t pud_mkdevmap(pud_t pud)
480 return pud_set_flags(pud, _PAGE_DEVMAP);
483 static inline pud_t pud_mkhuge(pud_t pud)
485 return pud_set_flags(pud, _PAGE_PSE);
488 static inline pud_t pud_mkyoung(pud_t pud)
490 return pud_set_flags(pud, _PAGE_ACCESSED);
493 static inline pud_t pud_mkwrite(pud_t pud)
495 return pud_set_flags(pud, _PAGE_RW);
498 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
499 static inline int pte_soft_dirty(pte_t pte)
501 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
504 static inline int pmd_soft_dirty(pmd_t pmd)
506 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
509 static inline int pud_soft_dirty(pud_t pud)
511 return pud_flags(pud) & _PAGE_SOFT_DIRTY;
514 static inline pte_t pte_mksoft_dirty(pte_t pte)
516 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
519 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
521 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
524 static inline pud_t pud_mksoft_dirty(pud_t pud)
526 return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
529 static inline pte_t pte_clear_soft_dirty(pte_t pte)
531 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
534 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
536 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
539 static inline pud_t pud_clear_soft_dirty(pud_t pud)
541 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
544 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
547 * Mask out unsupported bits in a present pgprot. Non-present pgprots
548 * can use those bits for other purposes, so leave them be.
550 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
552 pgprotval_t protval = pgprot_val(pgprot);
554 if (protval & _PAGE_PRESENT)
555 protval &= __supported_pte_mask;
560 static inline pgprotval_t check_pgprot(pgprot_t pgprot)
562 pgprotval_t massaged_val = massage_pgprot(pgprot);
564 /* mmdebug.h can not be included here because of dependencies */
565 #ifdef CONFIG_DEBUG_VM
566 WARN_ONCE(pgprot_val(pgprot) != massaged_val,
567 "attempted to set unsupported pgprot: %016llx "
568 "bits: %016llx supported: %016llx\n",
569 (u64)pgprot_val(pgprot),
570 (u64)pgprot_val(pgprot) ^ massaged_val,
571 (u64)__supported_pte_mask);
577 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
579 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
580 pfn ^= protnone_mask(pgprot_val(pgprot));
582 return __pte(pfn | check_pgprot(pgprot));
585 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
587 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
588 pfn ^= protnone_mask(pgprot_val(pgprot));
589 pfn &= PHYSICAL_PMD_PAGE_MASK;
590 return __pmd(pfn | check_pgprot(pgprot));
593 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
595 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
596 pfn ^= protnone_mask(pgprot_val(pgprot));
597 pfn &= PHYSICAL_PUD_PAGE_MASK;
598 return __pud(pfn | check_pgprot(pgprot));
601 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
603 return pfn_pmd(pmd_pfn(pmd),
604 __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
607 static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
609 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
611 pteval_t val = pte_val(pte), oldval = val;
614 * Chop off the NX bit (if present), and add the NX portion of
615 * the newprot (if present):
617 val &= _PAGE_CHG_MASK;
618 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK;
619 val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
623 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
625 pmdval_t val = pmd_val(pmd), oldval = val;
627 val &= _HPAGE_CHG_MASK;
628 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK;
629 val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
634 * mprotect needs to preserve PAT and encryption bits when updating
637 #define pgprot_modify pgprot_modify
638 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
640 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
641 pgprotval_t addbits = pgprot_val(newprot) & ~_PAGE_CHG_MASK;
642 return __pgprot(preservebits | addbits);
645 #define pte_pgprot(x) __pgprot(pte_flags(x))
646 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
647 #define pud_pgprot(x) __pgprot(pud_flags(x))
648 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
650 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
652 static inline pgprot_t arch_filter_pgprot(pgprot_t prot)
654 return canon_pgprot(prot);
657 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
658 enum page_cache_mode pcm,
659 enum page_cache_mode new_pcm)
662 * PAT type is always WB for untracked ranges, so no need to check.
664 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
668 * Certain new memtypes are not allowed with certain
670 * - request is uncached, return cannot be write-back
671 * - request is write-combine, return cannot be write-back
672 * - request is write-through, return cannot be write-back
673 * - request is write-through, return cannot be write-combine
675 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
676 new_pcm == _PAGE_CACHE_MODE_WB) ||
677 (pcm == _PAGE_CACHE_MODE_WC &&
678 new_pcm == _PAGE_CACHE_MODE_WB) ||
679 (pcm == _PAGE_CACHE_MODE_WT &&
680 new_pcm == _PAGE_CACHE_MODE_WB) ||
681 (pcm == _PAGE_CACHE_MODE_WT &&
682 new_pcm == _PAGE_CACHE_MODE_WC)) {
689 pmd_t *populate_extra_pmd(unsigned long vaddr);
690 pte_t *populate_extra_pte(unsigned long vaddr);
692 #ifdef CONFIG_PAGE_TABLE_ISOLATION
693 pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd);
696 * Take a PGD location (pgdp) and a pgd value that needs to be set there.
697 * Populates the user and returns the resulting PGD that must be set in
698 * the kernel copy of the page tables.
700 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
702 if (!static_cpu_has(X86_FEATURE_PTI))
704 return __pti_set_user_pgtbl(pgdp, pgd);
706 #else /* CONFIG_PAGE_TABLE_ISOLATION */
707 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
711 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
713 #endif /* __ASSEMBLY__ */
717 # include <asm/pgtable_32.h>
719 # include <asm/pgtable_64.h>
723 #include <linux/mm_types.h>
724 #include <linux/mmdebug.h>
725 #include <linux/log2.h>
726 #include <asm/fixmap.h>
728 static inline int pte_none(pte_t pte)
730 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
733 #define __HAVE_ARCH_PTE_SAME
734 static inline int pte_same(pte_t a, pte_t b)
736 return a.pte == b.pte;
739 static inline int pte_present(pte_t a)
741 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
744 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
745 static inline int pte_devmap(pte_t a)
747 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
751 #define pte_accessible pte_accessible
752 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
754 if (pte_flags(a) & _PAGE_PRESENT)
757 if ((pte_flags(a) & _PAGE_PROTNONE) &&
758 atomic_read(&mm->tlb_flush_pending))
764 static inline int pmd_present(pmd_t pmd)
767 * Checking for _PAGE_PSE is needed too because
768 * split_huge_page will temporarily clear the present bit (but
769 * the _PAGE_PSE flag will remain set at all times while the
770 * _PAGE_PRESENT bit is clear).
772 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
775 #ifdef CONFIG_NUMA_BALANCING
777 * These work without NUMA balancing but the kernel does not care. See the
778 * comment in include/linux/pgtable.h
780 static inline int pte_protnone(pte_t pte)
782 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
786 static inline int pmd_protnone(pmd_t pmd)
788 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
791 #endif /* CONFIG_NUMA_BALANCING */
793 static inline int pmd_none(pmd_t pmd)
795 /* Only check low word on 32-bit platforms, since it might be
796 out of sync with upper half. */
797 unsigned long val = native_pmd_val(pmd);
798 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
801 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
803 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
807 * Currently stuck as a macro due to indirect forward reference to
808 * linux/mmzone.h's __section_mem_map_addr() definition:
810 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
813 * Conversion functions: convert a page and protection to a page entry,
814 * and a page entry and page directory to the page they refer to.
816 * (Currently stuck as a macro because of indirect forward reference
817 * to linux/mm.h:page_to_nid())
819 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
821 static inline int pmd_bad(pmd_t pmd)
823 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
826 static inline unsigned long pages_to_mb(unsigned long npg)
828 return npg >> (20 - PAGE_SHIFT);
831 #if CONFIG_PGTABLE_LEVELS > 2
832 static inline int pud_none(pud_t pud)
834 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
837 static inline int pud_present(pud_t pud)
839 return pud_flags(pud) & _PAGE_PRESENT;
842 static inline pmd_t *pud_pgtable(pud_t pud)
844 return (pmd_t *)__va(pud_val(pud) & pud_pfn_mask(pud));
848 * Currently stuck as a macro due to indirect forward reference to
849 * linux/mmzone.h's __section_mem_map_addr() definition:
851 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
853 #define pud_leaf pud_large
854 static inline int pud_large(pud_t pud)
856 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
857 (_PAGE_PSE | _PAGE_PRESENT);
860 static inline int pud_bad(pud_t pud)
862 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
865 #define pud_leaf pud_large
866 static inline int pud_large(pud_t pud)
870 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
872 #if CONFIG_PGTABLE_LEVELS > 3
873 static inline int p4d_none(p4d_t p4d)
875 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
878 static inline int p4d_present(p4d_t p4d)
880 return p4d_flags(p4d) & _PAGE_PRESENT;
883 static inline pud_t *p4d_pgtable(p4d_t p4d)
885 return (pud_t *)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
889 * Currently stuck as a macro due to indirect forward reference to
890 * linux/mmzone.h's __section_mem_map_addr() definition:
892 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
894 static inline int p4d_bad(p4d_t p4d)
896 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER;
898 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
899 ignore_flags |= _PAGE_NX;
901 return (p4d_flags(p4d) & ~ignore_flags) != 0;
903 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
905 static inline unsigned long p4d_index(unsigned long address)
907 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
910 #if CONFIG_PGTABLE_LEVELS > 4
911 static inline int pgd_present(pgd_t pgd)
913 if (!pgtable_l5_enabled())
915 return pgd_flags(pgd) & _PAGE_PRESENT;
918 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
920 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
924 * Currently stuck as a macro due to indirect forward reference to
925 * linux/mmzone.h's __section_mem_map_addr() definition:
927 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
929 /* to find an entry in a page-table-directory. */
930 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
932 if (!pgtable_l5_enabled())
934 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
937 static inline int pgd_bad(pgd_t pgd)
939 unsigned long ignore_flags = _PAGE_USER;
941 if (!pgtable_l5_enabled())
944 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
945 ignore_flags |= _PAGE_NX;
947 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
950 static inline int pgd_none(pgd_t pgd)
952 if (!pgtable_l5_enabled())
955 * There is no need to do a workaround for the KNL stray
956 * A/D bit erratum here. PGDs only point to page tables
957 * except on 32-bit non-PAE which is not supported on
960 return !native_pgd_val(pgd);
962 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
964 #endif /* __ASSEMBLY__ */
966 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
967 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
971 extern int direct_gbpages;
972 void init_mem_mapping(void);
973 void early_alloc_pgt_buf(void);
974 extern void memblock_find_dma_reserve(void);
975 void __init poking_init(void);
976 unsigned long init_memory_mapping(unsigned long start,
977 unsigned long end, pgprot_t prot);
980 extern pgd_t trampoline_pgd_entry;
983 /* local pte updates need not use xchg for locking */
984 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
988 /* Pure native function needs no input for mm, addr */
989 native_pte_clear(NULL, 0, ptep);
993 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
997 native_pmd_clear(pmdp);
1001 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
1005 native_pud_clear(pudp);
1009 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
1010 pte_t *ptep, pte_t pte)
1012 page_table_check_pte_set(mm, addr, ptep, pte);
1016 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1017 pmd_t *pmdp, pmd_t pmd)
1019 page_table_check_pmd_set(mm, addr, pmdp, pmd);
1023 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
1024 pud_t *pudp, pud_t pud)
1026 page_table_check_pud_set(mm, addr, pudp, pud);
1027 native_set_pud(pudp, pud);
1031 * We only update the dirty/accessed state if we set
1032 * the dirty bit by hand in the kernel, since the hardware
1033 * will do the accessed bit for us, and we don't want to
1034 * race with other CPU's that might be updating the dirty
1035 * bit at the same time.
1037 struct vm_area_struct;
1039 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1040 extern int ptep_set_access_flags(struct vm_area_struct *vma,
1041 unsigned long address, pte_t *ptep,
1042 pte_t entry, int dirty);
1044 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1045 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1046 unsigned long addr, pte_t *ptep);
1048 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1049 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1050 unsigned long address, pte_t *ptep);
1052 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1053 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1056 pte_t pte = native_ptep_get_and_clear(ptep);
1057 page_table_check_pte_clear(mm, addr, pte);
1061 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1062 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1063 unsigned long addr, pte_t *ptep,
1069 * Full address destruction in progress; paravirt does not
1070 * care about updates and native needs no locking
1072 pte = native_local_ptep_get_and_clear(ptep);
1073 page_table_check_pte_clear(mm, addr, pte);
1075 pte = ptep_get_and_clear(mm, addr, ptep);
1080 #define __HAVE_ARCH_PTEP_CLEAR
1081 static inline void ptep_clear(struct mm_struct *mm, unsigned long addr,
1084 if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK))
1085 ptep_get_and_clear(mm, addr, ptep);
1087 pte_clear(mm, addr, ptep);
1090 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1091 static inline void ptep_set_wrprotect(struct mm_struct *mm,
1092 unsigned long addr, pte_t *ptep)
1094 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1097 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1099 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1101 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1102 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1103 unsigned long address, pmd_t *pmdp,
1104 pmd_t entry, int dirty);
1105 extern int pudp_set_access_flags(struct vm_area_struct *vma,
1106 unsigned long address, pud_t *pudp,
1107 pud_t entry, int dirty);
1109 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1110 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1111 unsigned long addr, pmd_t *pmdp);
1112 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1113 unsigned long addr, pud_t *pudp);
1115 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1116 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1117 unsigned long address, pmd_t *pmdp);
1120 #define pmd_write pmd_write
1121 static inline int pmd_write(pmd_t pmd)
1123 return pmd_flags(pmd) & _PAGE_RW;
1126 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1127 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1130 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
1132 page_table_check_pmd_clear(mm, addr, pmd);
1137 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1138 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1139 unsigned long addr, pud_t *pudp)
1141 pud_t pud = native_pudp_get_and_clear(pudp);
1143 page_table_check_pud_clear(mm, addr, pud);
1148 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1149 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1150 unsigned long addr, pmd_t *pmdp)
1152 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1155 #define pud_write pud_write
1156 static inline int pud_write(pud_t pud)
1158 return pud_flags(pud) & _PAGE_RW;
1161 #ifndef pmdp_establish
1162 #define pmdp_establish pmdp_establish
1163 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1164 unsigned long address, pmd_t *pmdp, pmd_t pmd)
1166 page_table_check_pmd_set(vma->vm_mm, address, pmdp, pmd);
1167 if (IS_ENABLED(CONFIG_SMP)) {
1168 return xchg(pmdp, pmd);
1171 WRITE_ONCE(*pmdp, pmd);
1177 * Page table pages are page-aligned. The lower half of the top
1178 * level is used for userspace and the top half for the kernel.
1180 * Returns true for parts of the PGD that map userspace and
1181 * false for the parts that map the kernel.
1183 static inline bool pgdp_maps_userspace(void *__ptr)
1185 unsigned long ptr = (unsigned long)__ptr;
1187 return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
1190 #define pgd_leaf pgd_large
1191 static inline int pgd_large(pgd_t pgd) { return 0; }
1193 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1195 * All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
1196 * (8k-aligned and 8k in size). The kernel one is at the beginning 4k and
1197 * the user one is in the last 4k. To switch between them, you
1198 * just need to flip the 12th bit in their addresses.
1200 #define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
1203 * This generates better code than the inline assembly in
1206 static inline void *ptr_set_bit(void *ptr, int bit)
1208 unsigned long __ptr = (unsigned long)ptr;
1211 return (void *)__ptr;
1213 static inline void *ptr_clear_bit(void *ptr, int bit)
1215 unsigned long __ptr = (unsigned long)ptr;
1218 return (void *)__ptr;
1221 static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
1223 return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1226 static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
1228 return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1231 static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
1233 return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1236 static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
1238 return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1240 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
1243 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1245 * dst - pointer to pgd range anywhere on a pgd page
1247 * count - the number of pgds to copy.
1249 * dst and src can be on the same page, but the range must not overlap,
1250 * and must not cross a page boundary.
1252 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1254 memcpy(dst, src, count * sizeof(pgd_t));
1255 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1256 if (!static_cpu_has(X86_FEATURE_PTI))
1258 /* Clone the user space pgd as well */
1259 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1260 count * sizeof(pgd_t));
1264 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1265 static inline int page_level_shift(enum pg_level level)
1267 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1269 static inline unsigned long page_level_size(enum pg_level level)
1271 return 1UL << page_level_shift(level);
1273 static inline unsigned long page_level_mask(enum pg_level level)
1275 return ~(page_level_size(level) - 1);
1279 * The x86 doesn't have any external MMU info: the kernel page
1280 * tables contain all the necessary information.
1282 static inline void update_mmu_cache(struct vm_area_struct *vma,
1283 unsigned long addr, pte_t *ptep)
1286 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1287 unsigned long addr, pmd_t *pmd)
1290 static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1291 unsigned long addr, pud_t *pud)
1295 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1296 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1298 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1301 static inline int pte_swp_soft_dirty(pte_t pte)
1303 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1306 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1308 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1311 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1312 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1314 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1317 static inline int pmd_swp_soft_dirty(pmd_t pmd)
1319 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1322 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1324 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1329 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
1330 static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
1332 return pte_set_flags(pte, _PAGE_SWP_UFFD_WP);
1335 static inline int pte_swp_uffd_wp(pte_t pte)
1337 return pte_flags(pte) & _PAGE_SWP_UFFD_WP;
1340 static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
1342 return pte_clear_flags(pte, _PAGE_SWP_UFFD_WP);
1345 static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
1347 return pmd_set_flags(pmd, _PAGE_SWP_UFFD_WP);
1350 static inline int pmd_swp_uffd_wp(pmd_t pmd)
1352 return pmd_flags(pmd) & _PAGE_SWP_UFFD_WP;
1355 static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
1357 return pmd_clear_flags(pmd, _PAGE_SWP_UFFD_WP);
1359 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
1361 static inline u16 pte_flags_pkey(unsigned long pte_flags)
1363 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1364 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1365 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1371 static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1373 u32 pkru = read_pkru();
1375 if (!__pkru_allows_read(pkru, pkey))
1377 if (write && !__pkru_allows_write(pkru, pkey))
1384 * 'pteval' can come from a PTE, PMD or PUD. We only check
1385 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1386 * same value on all 3 types.
1388 static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1390 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1393 need_pte_bits |= _PAGE_RW;
1395 if ((pteval & need_pte_bits) != need_pte_bits)
1398 return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1401 #define pte_access_permitted pte_access_permitted
1402 static inline bool pte_access_permitted(pte_t pte, bool write)
1404 return __pte_access_permitted(pte_val(pte), write);
1407 #define pmd_access_permitted pmd_access_permitted
1408 static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1410 return __pte_access_permitted(pmd_val(pmd), write);
1413 #define pud_access_permitted pud_access_permitted
1414 static inline bool pud_access_permitted(pud_t pud, bool write)
1416 return __pte_access_permitted(pud_val(pud), write);
1419 #define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1
1420 extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot);
1422 static inline bool arch_has_pfn_modify_check(void)
1424 return boot_cpu_has_bug(X86_BUG_L1TF);
1427 #define arch_faults_on_old_pte arch_faults_on_old_pte
1428 static inline bool arch_faults_on_old_pte(void)
1433 #endif /* __ASSEMBLY__ */
1435 #endif /* _ASM_X86_PGTABLE_H */