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