pgalloc.h

  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
 15static 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)
 21static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
 22static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)	{}
 23static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)	{}
 24static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
 25					    unsigned long start, unsigned long count) {}
 26static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)	{}
 27static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)	{}
 28static inline void paravirt_release_pte(unsigned long pfn) {}
 29static inline void paravirt_release_pmd(unsigned long pfn) {}
 30static inline void paravirt_release_pud(unsigned long pfn) {}
 31static 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 */
 39static 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 */
 49extern pgd_t *pgd_alloc(struct mm_struct *);
 50extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 51
 52extern pgtable_t pte_alloc_one(struct mm_struct *);
 53
 54extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
 55
 56static 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
 62static 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
 69static 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
 76static 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
 86extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
 87
 88static 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
 95extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
 96#else	/* !CONFIG_X86_PAE */
 97static 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
103static 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
111static 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
117static 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
123extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
124
125static 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
132static 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
140static 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
148extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
149
150static 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 */