xref: /linux/arch/x86/include/asm/pgalloc.h (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
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 
__paravirt_pgd_alloc(struct mm_struct * mm)13 static 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)
paravirt_pgd_free(struct mm_struct * mm,pgd_t * pgd)19 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
paravirt_alloc_pte(struct mm_struct * mm,unsigned long pfn)20 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)	{}
paravirt_alloc_pmd(struct mm_struct * mm,unsigned long pfn)21 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)22 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
23 					    unsigned long start, unsigned long count) {}
paravirt_alloc_pud(struct mm_struct * mm,unsigned long pfn)24 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)	{}
paravirt_alloc_p4d(struct mm_struct * mm,unsigned long pfn)25 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)	{}
paravirt_release_pte(unsigned long pfn)26 static inline void paravirt_release_pte(unsigned long pfn) {}
paravirt_release_pmd(unsigned long pfn)27 static inline void paravirt_release_pmd(unsigned long pfn) {}
paravirt_release_pud(unsigned long pfn)28 static inline void paravirt_release_pud(unsigned long pfn) {}
paravirt_release_p4d(unsigned long pfn)29 static inline void paravirt_release_p4d(unsigned long pfn) {}
30 #endif
31 
32 /*
33  * Flags to use when allocating a user page table page.
34  */
35 extern gfp_t __userpte_alloc_gfp;
36 
37 #ifdef CONFIG_MITIGATION_PAGE_TABLE_ISOLATION
38 /*
39  * Instead of one PGD, we acquire two PGDs.  Being order-1, it is
40  * both 8k in size and 8k-aligned.  That lets us just flip bit 12
41  * in a pointer to swap between the two 4k halves.
42  */
43 #define PGD_ALLOCATION_ORDER 1
44 #else
45 #define PGD_ALLOCATION_ORDER 0
46 #endif
47 
48 /*
49  * Allocate and free page tables.
50  */
51 extern pgd_t *pgd_alloc(struct mm_struct *);
52 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
53 
54 extern pgtable_t pte_alloc_one(struct mm_struct *);
55 
56 extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
57 
__pte_free_tlb(struct mmu_gather * tlb,struct page * pte,unsigned long address)58 static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
59 				  unsigned long address)
60 {
61 	___pte_free_tlb(tlb, pte);
62 }
63 
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)64 static inline void pmd_populate_kernel(struct mm_struct *mm,
65 				       pmd_t *pmd, pte_t *pte)
66 {
67 	paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
68 	set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
69 }
70 
pmd_populate_kernel_safe(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)71 static inline void pmd_populate_kernel_safe(struct mm_struct *mm,
72 				       pmd_t *pmd, pte_t *pte)
73 {
74 	paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
75 	set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
76 }
77 
pmd_populate(struct mm_struct * mm,pmd_t * pmd,struct page * pte)78 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
79 				struct page *pte)
80 {
81 	unsigned long pfn = page_to_pfn(pte);
82 
83 	paravirt_alloc_pte(mm, pfn);
84 	set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
85 }
86 
87 #if CONFIG_PGTABLE_LEVELS > 2
88 extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
89 
__pmd_free_tlb(struct mmu_gather * tlb,pmd_t * pmd,unsigned long address)90 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
91 				  unsigned long address)
92 {
93 	___pmd_free_tlb(tlb, pmd);
94 }
95 
96 #ifdef CONFIG_X86_PAE
97 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
98 #else	/* !CONFIG_X86_PAE */
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)99 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
100 {
101 	paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
102 	set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
103 }
104 
pud_populate_safe(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)105 static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
106 {
107 	paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
108 	set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd)));
109 }
110 #endif	/* CONFIG_X86_PAE */
111 
112 #if CONFIG_PGTABLE_LEVELS > 3
p4d_populate(struct mm_struct * mm,p4d_t * p4d,pud_t * pud)113 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
114 {
115 	paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
116 	set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
117 }
118 
p4d_populate_safe(struct mm_struct * mm,p4d_t * p4d,pud_t * pud)119 static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
120 {
121 	paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
122 	set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
123 }
124 
125 extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
126 
__pud_free_tlb(struct mmu_gather * tlb,pud_t * pud,unsigned long address)127 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
128 				  unsigned long address)
129 {
130 	___pud_free_tlb(tlb, pud);
131 }
132 
133 #if CONFIG_PGTABLE_LEVELS > 4
pgd_populate(struct mm_struct * mm,pgd_t * pgd,p4d_t * p4d)134 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
135 {
136 	if (!pgtable_l5_enabled())
137 		return;
138 	paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
139 	set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
140 }
141 
pgd_populate_safe(struct mm_struct * mm,pgd_t * pgd,p4d_t * p4d)142 static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
143 {
144 	if (!pgtable_l5_enabled())
145 		return;
146 	paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
147 	set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
148 }
149 
p4d_alloc_one(struct mm_struct * mm,unsigned long addr)150 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
151 {
152 	gfp_t gfp = GFP_KERNEL_ACCOUNT;
153 
154 	if (mm == &init_mm)
155 		gfp &= ~__GFP_ACCOUNT;
156 	return (p4d_t *)get_zeroed_page(gfp);
157 }
158 
p4d_free(struct mm_struct * mm,p4d_t * p4d)159 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
160 {
161 	if (!pgtable_l5_enabled())
162 		return;
163 
164 	BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
165 	free_page((unsigned long)p4d);
166 }
167 
168 extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
169 
__p4d_free_tlb(struct mmu_gather * tlb,p4d_t * p4d,unsigned long address)170 static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
171 				  unsigned long address)
172 {
173 	if (pgtable_l5_enabled())
174 		___p4d_free_tlb(tlb, p4d);
175 }
176 
177 #endif	/* CONFIG_PGTABLE_LEVELS > 4 */
178 #endif	/* CONFIG_PGTABLE_LEVELS > 3 */
179 #endif	/* CONFIG_PGTABLE_LEVELS > 2 */
180 
181 #endif /* _ASM_X86_PGALLOC_H */
182