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 #include <linux/refcount.h> 13 14 /* Generic bits for GMAP notification on DAT table entry changes. */ 15 #define GMAP_NOTIFY_SHADOW 0x2 16 #define GMAP_NOTIFY_MPROT 0x1 17 18 /* Status bits only for huge segment entries */ 19 #define _SEGMENT_ENTRY_GMAP_IN 0x8000 /* invalidation notify bit */ 20 #define _SEGMENT_ENTRY_GMAP_UC 0x4000 /* dirty (migration) */ 21 22 /** 23 * struct gmap_struct - guest address space 24 * @list: list head for the mm->context gmap list 25 * @crst_list: list of all crst tables used in the guest address space 26 * @mm: pointer to the parent mm_struct 27 * @guest_to_host: radix tree with guest to host address translation 28 * @host_to_guest: radix tree with pointer to segment table entries 29 * @guest_table_lock: spinlock to protect all entries in the guest page table 30 * @ref_count: reference counter for the gmap structure 31 * @table: pointer to the page directory 32 * @asce: address space control element for gmap page table 33 * @pfault_enabled: defines if pfaults are applicable for the guest 34 * @host_to_rmap: radix tree with gmap_rmap lists 35 * @children: list of shadow gmap structures 36 * @pt_list: list of all page tables used in the shadow guest address space 37 * @shadow_lock: spinlock to protect the shadow gmap list 38 * @parent: pointer to the parent gmap for shadow guest address spaces 39 * @orig_asce: ASCE for which the shadow page table has been created 40 * @edat_level: edat level to be used for the shadow translation 41 * @removed: flag to indicate if a shadow guest address space has been removed 42 * @initialized: flag to indicate if a shadow guest address space can be used 43 */ 44 struct gmap { 45 struct list_head list; 46 struct list_head crst_list; 47 struct mm_struct *mm; 48 struct radix_tree_root guest_to_host; 49 struct radix_tree_root host_to_guest; 50 spinlock_t guest_table_lock; 51 refcount_t ref_count; 52 unsigned long *table; 53 unsigned long asce; 54 unsigned long asce_end; 55 void *private; 56 bool pfault_enabled; 57 /* Additional data for shadow guest address spaces */ 58 struct radix_tree_root host_to_rmap; 59 struct list_head children; 60 struct list_head pt_list; 61 spinlock_t shadow_lock; 62 struct gmap *parent; 63 unsigned long orig_asce; 64 int edat_level; 65 bool removed; 66 bool initialized; 67 }; 68 69 /** 70 * struct gmap_rmap - reverse mapping for shadow page table entries 71 * @next: pointer to next rmap in the list 72 * @raddr: virtual rmap address in the shadow guest address space 73 */ 74 struct gmap_rmap { 75 struct gmap_rmap *next; 76 unsigned long raddr; 77 }; 78 79 #define gmap_for_each_rmap(pos, head) \ 80 for (pos = (head); pos; pos = pos->next) 81 82 #define gmap_for_each_rmap_safe(pos, n, head) \ 83 for (pos = (head); n = pos ? pos->next : NULL, pos; pos = n) 84 85 /** 86 * struct gmap_notifier - notify function block for page invalidation 87 * @notifier_call: address of callback function 88 */ 89 struct gmap_notifier { 90 struct list_head list; 91 struct rcu_head rcu; 92 void (*notifier_call)(struct gmap *gmap, unsigned long start, 93 unsigned long end); 94 }; 95 96 static inline int gmap_is_shadow(struct gmap *gmap) 97 { 98 return !!gmap->parent; 99 } 100 101 struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit); 102 void gmap_remove(struct gmap *gmap); 103 struct gmap *gmap_get(struct gmap *gmap); 104 void gmap_put(struct gmap *gmap); 105 106 void gmap_enable(struct gmap *gmap); 107 void gmap_disable(struct gmap *gmap); 108 struct gmap *gmap_get_enabled(void); 109 int gmap_map_segment(struct gmap *gmap, unsigned long from, 110 unsigned long to, unsigned long len); 111 int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len); 112 unsigned long __gmap_translate(struct gmap *, unsigned long gaddr); 113 unsigned long gmap_translate(struct gmap *, unsigned long gaddr); 114 int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr); 115 int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags); 116 void gmap_discard(struct gmap *, unsigned long from, unsigned long to); 117 void __gmap_zap(struct gmap *, unsigned long gaddr); 118 void gmap_unlink(struct mm_struct *, unsigned long *table, unsigned long vmaddr); 119 120 int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val); 121 122 struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce, 123 int edat_level); 124 int gmap_shadow_valid(struct gmap *sg, unsigned long asce, int edat_level); 125 int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t, 126 int fake); 127 int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t, 128 int fake); 129 int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, 130 int fake); 131 int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, 132 int fake); 133 int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr, 134 unsigned long *pgt, int *dat_protection, int *fake); 135 int gmap_shadow_page(struct gmap *sg, unsigned long saddr, pte_t pte); 136 137 void gmap_register_pte_notifier(struct gmap_notifier *); 138 void gmap_unregister_pte_notifier(struct gmap_notifier *); 139 void gmap_pte_notify(struct mm_struct *, unsigned long addr, pte_t *, 140 unsigned long bits); 141 142 int gmap_mprotect_notify(struct gmap *, unsigned long start, 143 unsigned long len, int prot); 144 145 void gmap_sync_dirty_log_pmd(struct gmap *gmap, unsigned long dirty_bitmap[4], 146 unsigned long gaddr, unsigned long vmaddr); 147 #endif /* _ASM_S390_GMAP_H */ 148