| 1 |
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| 2 | #ifndef _ASM_X86_PGALLOC_H
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| 3 | #define _ASM_X86_PGALLOC_H
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| 4 |
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| 5 | #include <linux/threads.h>
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| 6 | #include <linux/mm.h>
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| 7 | #include <linux/pagemap.h>
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| 8 |
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| 9 | #include <asm/cpufeature.h>
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| 10 |
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| 11 | #define __HAVE_ARCH_PTE_ALLOC_ONE
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| 12 | #define __HAVE_ARCH_PGD_FREE
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| 13 | #include <asm-generic/pgalloc.h>
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| 14 |
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| 15 | static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
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| 16 |
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| 17 | #ifdef CONFIG_PARAVIRT_XXL
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| 18 | #include <asm/paravirt.h>
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| 19 | #else
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| 20 | #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
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| 21 | static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
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| 22 | static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
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| 23 | static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
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| 24 | static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
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| 25 | unsigned long start, unsigned long count) {}
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| 26 | static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
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| 27 | static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {}
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| 28 | static inline void paravirt_release_pte(unsigned long pfn) {}
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| 29 | static inline void paravirt_release_pmd(unsigned long pfn) {}
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| 30 | static inline void paravirt_release_pud(unsigned long pfn) {}
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| 31 | static inline void paravirt_release_p4d(unsigned long pfn) {}
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| 32 | #endif
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| 33 |
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| 34 | |
| 35 | * In case of Page Table Isolation active, we acquire two PGDs instead of one.
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| 36 | * Being order-1, it is both 8k in size and 8k-aligned. That lets us just
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| 37 | * flip bit 12 in a pointer to swap between the two 4k halves.
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| 38 |
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| 39 | static inline unsigned int pgd_allocation_order(void)
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| 40 | {
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| 41 | if (cpu_feature_enabled(X86_FEATURE_PTI))
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| 42 | return 1;
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| 43 | return 0;
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| 44 | }
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| 45 |
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| 46 | |
| 47 | * Allocate and free page tables.
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| 48 |
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| 49 | extern pgd_t *pgd_alloc(struct mm_struct *);
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| 50 | extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
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| 51 |
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| 52 | extern pgtable_t pte_alloc_one(struct mm_struct *);
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| 53 |
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| 54 | extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
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| 55 |
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| 56 | static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
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| 57 | unsigned long address)
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| 58 | {
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| 59 | ___pte_free_tlb(tlb, pte);
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| 60 | }
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| 61 |
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| 62 | static inline void pmd_populate_kernel(struct mm_struct *mm,
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| 63 | pmd_t *pmd, pte_t *pte)
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| 64 | {
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| 65 | paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
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| 66 | set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
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| 67 | }
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| 68 |
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| 69 | static inline void pmd_populate_kernel_safe(struct mm_struct *mm,
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| 70 | pmd_t *pmd, pte_t *pte)
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| 71 | {
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| 72 | paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
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| 73 | set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
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| 74 | }
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| 75 |
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| 76 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
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| 77 | struct page *pte)
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| 78 | {
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| 79 | unsigned long pfn = page_to_pfn(pte);
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| 80 |
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| 81 | paravirt_alloc_pte(mm, pfn);
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| 82 | set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
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| 83 | }
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| 84 |
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| 85 | #if CONFIG_PGTABLE_LEVELS > 2
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| 86 | extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
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| 87 |
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| 88 | static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
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| 89 | unsigned long address)
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| 90 | {
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| 91 | ___pmd_free_tlb(tlb, pmd);
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| 92 | }
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| 93 |
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| 94 | #ifdef CONFIG_X86_PAE
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| 95 | extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
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| 96 | #else
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| 97 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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| 98 | {
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| 99 | paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
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| 100 | set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
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| 101 | }
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| 102 |
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| 103 | static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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| 104 | {
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| 105 | paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
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| 106 | set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd)));
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| 107 | }
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| 108 | #endif
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| 109 |
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| 110 | #if CONFIG_PGTABLE_LEVELS > 3
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| 111 | static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
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| 112 | {
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| 113 | paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
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| 114 | set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
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| 115 | }
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| 116 |
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| 117 | static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
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| 118 | {
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| 119 | paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
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| 120 | set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
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| 121 | }
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| 122 |
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| 123 | extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
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| 124 |
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| 125 | static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
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| 126 | unsigned long address)
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| 127 | {
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| 128 | ___pud_free_tlb(tlb, pud);
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| 129 | }
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| 130 |
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| 131 | #if CONFIG_PGTABLE_LEVELS > 4
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| 132 | static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
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| 133 | {
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| 134 | if (!pgtable_l5_enabled())
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| 135 | return;
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| 136 | paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
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| 137 | set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
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| 138 | }
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| 139 |
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| 140 | static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
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| 141 | {
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| 142 | if (!pgtable_l5_enabled())
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| 143 | return;
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| 144 | paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
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| 145 | set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
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| 146 | }
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| 147 |
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| 148 | extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
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| 149 |
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| 150 | static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
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| 151 | unsigned long address)
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| 152 | {
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| 153 | if (pgtable_l5_enabled())
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| 154 | ___p4d_free_tlb(tlb, p4d);
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| 155 | }
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| 156 |
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| 157 | #endif
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| 158 | #endif
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| 159 | #endif
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| 160 |
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| 161 | #endif
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