1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * KVM guest address space mapping code 4 * 5 * Copyright IBM Corp. 2007, 2016 6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 7 */ 8 9 #ifndef _ASM_S390_GMAP_H 10 #define _ASM_S390_GMAP_H 11 12 /** 13 * struct gmap_struct - guest address space 14 * @list: list head for the mm->context gmap list 15 * @crst_list: list of all crst tables used in the guest address space 16 * @mm: pointer to the parent mm_struct 17 * @guest_to_host: radix tree with guest to host address translation 18 * @host_to_guest: radix tree with pointer to segment table entries 19 * @guest_table_lock: spinlock to protect all entries in the guest page table 20 * @ref_count: reference counter for the gmap structure 21 * @table: pointer to the page directory 22 * @asce: address space control element for gmap page table 23 * @pfault_enabled: defines if pfaults are applicable for the guest 24 * @host_to_rmap: radix tree with gmap_rmap lists 25 * @children: list of shadow gmap structures 26 * @pt_list: list of all page tables used in the shadow guest address space 27 * @shadow_lock: spinlock to protect the shadow gmap list 28 * @parent: pointer to the parent gmap for shadow guest address spaces 29 * @orig_asce: ASCE for which the shadow page table has been created 30 * @edat_level: edat level to be used for the shadow translation 31 * @removed: flag to indicate if a shadow guest address space has been removed 32 * @initialized: flag to indicate if a shadow guest address space can be used 33 */ 34 struct gmap { 35 struct list_head list; 36 struct list_head crst_list; 37 struct mm_struct *mm; 38 struct radix_tree_root guest_to_host; 39 struct radix_tree_root host_to_guest; 40 spinlock_t guest_table_lock; 41 atomic_t ref_count; 42 unsigned long *table; 43 unsigned long asce; 44 unsigned long asce_end; 45 void *private; 46 bool pfault_enabled; 47 /* Additional data for shadow guest address spaces */ 48 struct radix_tree_root host_to_rmap; 49 struct list_head children; 50 struct list_head pt_list; 51 spinlock_t shadow_lock; 52 struct gmap *parent; 53 unsigned long orig_asce; 54 int edat_level; 55 bool removed; 56 bool initialized; 57 }; 58 59 /** 60 * struct gmap_rmap - reverse mapping for shadow page table entries 61 * @next: pointer to next rmap in the list 62 * @raddr: virtual rmap address in the shadow guest address space 63 */ 64 struct gmap_rmap { 65 struct gmap_rmap *next; 66 unsigned long raddr; 67 }; 68 69 #define gmap_for_each_rmap(pos, head) \ 70 for (pos = (head); pos; pos = pos->next) 71 72 #define gmap_for_each_rmap_safe(pos, n, head) \ 73 for (pos = (head); n = pos ? pos->next : NULL, pos; pos = n) 74 75 /** 76 * struct gmap_notifier - notify function block for page invalidation 77 * @notifier_call: address of callback function 78 */ 79 struct gmap_notifier { 80 struct list_head list; 81 struct rcu_head rcu; 82 void (*notifier_call)(struct gmap *gmap, unsigned long start, 83 unsigned long end); 84 }; 85 86 static inline int gmap_is_shadow(struct gmap *gmap) 87 { 88 return !!gmap->parent; 89 } 90 91 struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit); 92 void gmap_remove(struct gmap *gmap); 93 struct gmap *gmap_get(struct gmap *gmap); 94 void gmap_put(struct gmap *gmap); 95 96 void gmap_enable(struct gmap *gmap); 97 void gmap_disable(struct gmap *gmap); 98 struct gmap *gmap_get_enabled(void); 99 int gmap_map_segment(struct gmap *gmap, unsigned long from, 100 unsigned long to, unsigned long len); 101 int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len); 102 unsigned long __gmap_translate(struct gmap *, unsigned long gaddr); 103 unsigned long gmap_translate(struct gmap *, unsigned long gaddr); 104 int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr); 105 int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags); 106 void gmap_discard(struct gmap *, unsigned long from, unsigned long to); 107 void __gmap_zap(struct gmap *, unsigned long gaddr); 108 void gmap_unlink(struct mm_struct *, unsigned long *table, unsigned long vmaddr); 109 110 int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val); 111 112 struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce, 113 int edat_level); 114 int gmap_shadow_valid(struct gmap *sg, unsigned long asce, int edat_level); 115 int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t, 116 int fake); 117 int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t, 118 int fake); 119 int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, 120 int fake); 121 int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, 122 int fake); 123 int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr, 124 unsigned long *pgt, int *dat_protection, int *fake); 125 int gmap_shadow_page(struct gmap *sg, unsigned long saddr, pte_t pte); 126 127 void gmap_register_pte_notifier(struct gmap_notifier *); 128 void gmap_unregister_pte_notifier(struct gmap_notifier *); 129 void gmap_pte_notify(struct mm_struct *, unsigned long addr, pte_t *, 130 unsigned long bits); 131 132 int gmap_mprotect_notify(struct gmap *, unsigned long start, 133 unsigned long len, int prot); 134 135 #endif /* _ASM_S390_GMAP_H */ 136