arch/arm/include/asm/stage2_pgtable.h

   1 /*
   2  * Copyright (C) 2016 - ARM Ltd
   3  *
   4  * stage2 page table helpers
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef __ARM_S2_PGTABLE_H_
  20 #define __ARM_S2_PGTABLE_H_
  21
  22 /*
  23  * kvm_mmu_cache_min_pages() is the number of pages required
  24  * to install a stage-2 translation. We pre-allocate the entry
  25  * level table at VM creation. Since we have a 3 level page-table,
  26  * we need only two pages to add a new mapping.
  27  */
  28 #define kvm_mmu_cache_min_pages(kvm)    2
  29
  30 #define stage2_pgd_none(kvm, pgd)               pgd_none(pgd)
  31 #define stage2_pgd_clear(kvm, pgd)              pgd_clear(pgd)
  32 #define stage2_pgd_present(kvm, pgd)            pgd_present(pgd)
  33 #define stage2_pgd_populate(kvm, pgd, pud)      pgd_populate(NULL, pgd, pud)
  34 #define stage2_pud_offset(kvm, pgd, address)    pud_offset(pgd, address)
  35 #define stage2_pud_free(kvm, pud)               pud_free(NULL, pud)
  36
  37 #define stage2_pud_none(kvm, pud)               pud_none(pud)
  38 #define stage2_pud_clear(kvm, pud)              pud_clear(pud)
  39 #define stage2_pud_present(kvm, pud)            pud_present(pud)
  40 #define stage2_pud_populate(kvm, pud, pmd)      pud_populate(NULL, pud, pmd)
  41 #define stage2_pmd_offset(kvm, pud, address)    pmd_offset(pud, address)
  42 #define stage2_pmd_free(kvm, pmd)               pmd_free(NULL, pmd)
  43
  44 #define stage2_pud_huge(kvm, pud)               pud_huge(pud)
  45
  46 /* Open coded p*d_addr_end that can deal with 64bit addresses */
  47 static inline phys_addr_t
  48 stage2_pgd_addr_end(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
  49 {
  50         phys_addr_t boundary = (addr + PGDIR_SIZE) & PGDIR_MASK;
  51
  52         return (boundary - 1 < end - 1) ? boundary : end;
  53 }
  54
  55 #define stage2_pud_addr_end(kvm, addr, end)     (end)
  56
  57 static inline phys_addr_t
  58 stage2_pmd_addr_end(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
  59 {
  60         phys_addr_t boundary = (addr + PMD_SIZE) & PMD_MASK;
  61
  62         return (boundary - 1 < end - 1) ? boundary : end;
  63 }
  64
  65 #define stage2_pgd_index(kvm, addr)             pgd_index(addr)
  66
  67 #define stage2_pte_table_empty(kvm, ptep)       kvm_page_empty(ptep)
  68 #define stage2_pmd_table_empty(kvm, pmdp)       kvm_page_empty(pmdp)
  69 #define stage2_pud_table_empty(kvm, pudp)       false
  70
  71 static inline bool kvm_stage2_has_pud(struct kvm *kvm)
  72 {
  73         return false;
  74 }
  75
  76 #define S2_PMD_MASK                             PMD_MASK
  77 #define S2_PMD_SIZE                             PMD_SIZE
  78 #define S2_PUD_MASK                             PUD_MASK
  79 #define S2_PUD_SIZE                             PUD_SIZE
  80
  81 static inline bool kvm_stage2_has_pmd(struct kvm *kvm)
  82 {
  83         return true;
  84 }
  85
  86 #endif  /* __ARM_S2_PGTABLE_H_ */