1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGALLOC_H
3 #define _ASM_X86_PGALLOC_H
4
5 #include <linux/threads.h>
6 #include <linux/mm.h> /* for struct page */
7 #include <linux/pagemap.h>
8
9 #include <asm/cpufeature.h>
10
11 #define __HAVE_ARCH_PTE_ALLOC_ONE
12 #define __HAVE_ARCH_PGD_FREE
13 #include <asm-generic/pgalloc.h>
14
__paravirt_pgd_alloc(struct mm_struct * mm)15 static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
16
17 #ifdef CONFIG_PARAVIRT_XXL
18 #include <asm/paravirt.h>
19 #else
20 #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
paravirt_pgd_free(struct mm_struct * mm,pgd_t * pgd)21 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
paravirt_alloc_pte(struct mm_struct * mm,unsigned long pfn)22 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
paravirt_alloc_pmd(struct mm_struct * mm,unsigned long pfn)23 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
paravirt_alloc_pmd_clone(unsigned long pfn,unsigned long clonepfn,unsigned long start,unsigned long count)24 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
25 unsigned long start, unsigned long count) {}
paravirt_alloc_pud(struct mm_struct * mm,unsigned long pfn)26 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
paravirt_alloc_p4d(struct mm_struct * mm,unsigned long pfn)27 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {}
paravirt_release_pte(unsigned long pfn)28 static inline void paravirt_release_pte(unsigned long pfn) {}
paravirt_release_pmd(unsigned long pfn)29 static inline void paravirt_release_pmd(unsigned long pfn) {}
paravirt_release_pud(unsigned long pfn)30 static inline void paravirt_release_pud(unsigned long pfn) {}
paravirt_release_p4d(unsigned long pfn)31 static inline void paravirt_release_p4d(unsigned long pfn) {}
32 #endif
33
34 /*
35 * In case of Page Table Isolation active, we acquire two PGDs instead of one.
36 * Being order-1, it is both 8k in size and 8k-aligned. That lets us just
37 * flip bit 12 in a pointer to swap between the two 4k halves.
38 */
pgd_allocation_order(void)39 static inline unsigned int pgd_allocation_order(void)
40 {
41 if (cpu_feature_enabled(X86_FEATURE_PTI))
42 return 1;
43 return 0;
44 }
45
46 /*
47 * Allocate and free page tables.
48 */
49 extern pgd_t *pgd_alloc(struct mm_struct *);
50 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
51
52 extern pgtable_t pte_alloc_one(struct mm_struct *);
53
54 extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
55
__pte_free_tlb(struct mmu_gather * tlb,struct page * pte,unsigned long address)56 static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
57 unsigned long address)
58 {
59 ___pte_free_tlb(tlb, pte);
60 }
61
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)62 static inline void pmd_populate_kernel(struct mm_struct *mm,
63 pmd_t *pmd, pte_t *pte)
64 {
65 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
66 set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
67 }
68
pmd_populate_kernel_safe(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)69 static inline void pmd_populate_kernel_safe(struct mm_struct *mm,
70 pmd_t *pmd, pte_t *pte)
71 {
72 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
73 set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
74 }
75
pmd_populate(struct mm_struct * mm,pmd_t * pmd,struct page * pte)76 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
77 struct page *pte)
78 {
79 unsigned long pfn = page_to_pfn(pte);
80
81 paravirt_alloc_pte(mm, pfn);
82 set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
83 }
84
85 #if CONFIG_PGTABLE_LEVELS > 2
86 extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
87
__pmd_free_tlb(struct mmu_gather * tlb,pmd_t * pmd,unsigned long address)88 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
89 unsigned long address)
90 {
91 ___pmd_free_tlb(tlb, pmd);
92 }
93
94 #ifdef CONFIG_X86_PAE
95 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
96 #else /* !CONFIG_X86_PAE */
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)97 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
98 {
99 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
100 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
101 }
102
pud_populate_safe(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)103 static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
104 {
105 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
106 set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd)));
107 }
108 #endif /* CONFIG_X86_PAE */
109
110 #if CONFIG_PGTABLE_LEVELS > 3
p4d_populate(struct mm_struct * mm,p4d_t * p4d,pud_t * pud)111 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
112 {
113 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
114 set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
115 }
116
p4d_populate_safe(struct mm_struct * mm,p4d_t * p4d,pud_t * pud)117 static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
118 {
119 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
120 set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
121 }
122
123 extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
124
__pud_free_tlb(struct mmu_gather * tlb,pud_t * pud,unsigned long address)125 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
126 unsigned long address)
127 {
128 ___pud_free_tlb(tlb, pud);
129 }
130
131 #if CONFIG_PGTABLE_LEVELS > 4
pgd_populate(struct mm_struct * mm,pgd_t * pgd,p4d_t * p4d)132 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
133 {
134 if (!pgtable_l5_enabled())
135 return;
136 paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
137 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
138 }
139
pgd_populate_safe(struct mm_struct * mm,pgd_t * pgd,p4d_t * p4d)140 static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
141 {
142 if (!pgtable_l5_enabled())
143 return;
144 paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
145 set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
146 }
147
148 extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
149
__p4d_free_tlb(struct mmu_gather * tlb,p4d_t * p4d,unsigned long address)150 static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
151 unsigned long address)
152 {
153 if (pgtable_l5_enabled())
154 ___p4d_free_tlb(tlb, p4d);
155 }
156
157 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
158 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
159 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
160
161 #endif /* _ASM_X86_PGALLOC_H */
162