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