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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | /* SPDX-License-Identifier: GPL-2.0 */ /* * KVM guest address space mapping code * * Copyright IBM Corp. 2007, 2016 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> */ #ifndef _ASM_S390_GMAP_H #define _ASM_S390_GMAP_H #include <linux/radix-tree.h> #include <linux/refcount.h> /* Generic bits for GMAP notification on DAT table entry changes. */ #define GMAP_NOTIFY_SHADOW 0x2 #define GMAP_NOTIFY_MPROT 0x1 /* Status bits only for huge segment entries */ #define _SEGMENT_ENTRY_GMAP_IN 0x8000 /* invalidation notify bit */ #define _SEGMENT_ENTRY_GMAP_UC 0x4000 /* dirty (migration) */ /** * struct gmap_struct - guest address space * @list: list head for the mm->context gmap list * @crst_list: list of all crst tables used in the guest address space * @mm: pointer to the parent mm_struct * @guest_to_host: radix tree with guest to host address translation * @host_to_guest: radix tree with pointer to segment table entries * @guest_table_lock: spinlock to protect all entries in the guest page table * @ref_count: reference counter for the gmap structure * @table: pointer to the page directory * @asce: address space control element for gmap page table * @pfault_enabled: defines if pfaults are applicable for the guest * @guest_handle: protected virtual machine handle for the ultravisor * @host_to_rmap: radix tree with gmap_rmap lists * @children: list of shadow gmap structures * @pt_list: list of all page tables used in the shadow guest address space * @shadow_lock: spinlock to protect the shadow gmap list * @parent: pointer to the parent gmap for shadow guest address spaces * @orig_asce: ASCE for which the shadow page table has been created * @edat_level: edat level to be used for the shadow translation * @removed: flag to indicate if a shadow guest address space has been removed * @initialized: flag to indicate if a shadow guest address space can be used */ struct gmap { struct list_head list; struct list_head crst_list; struct mm_struct *mm; struct radix_tree_root guest_to_host; struct radix_tree_root host_to_guest; spinlock_t guest_table_lock; refcount_t ref_count; unsigned long *table; unsigned long asce; unsigned long asce_end; void *private; bool pfault_enabled; /* only set for protected virtual machines */ unsigned long guest_handle; /* Additional data for shadow guest address spaces */ struct radix_tree_root host_to_rmap; struct list_head children; struct list_head pt_list; spinlock_t shadow_lock; struct gmap *parent; unsigned long orig_asce; int edat_level; bool removed; bool initialized; }; /** * struct gmap_rmap - reverse mapping for shadow page table entries * @next: pointer to next rmap in the list * @raddr: virtual rmap address in the shadow guest address space */ struct gmap_rmap { struct gmap_rmap *next; unsigned long raddr; }; #define gmap_for_each_rmap(pos, head) \ for (pos = (head); pos; pos = pos->next) #define gmap_for_each_rmap_safe(pos, n, head) \ for (pos = (head); n = pos ? pos->next : NULL, pos; pos = n) /** * struct gmap_notifier - notify function block for page invalidation * @notifier_call: address of callback function */ struct gmap_notifier { struct list_head list; struct rcu_head rcu; void (*notifier_call)(struct gmap *gmap, unsigned long start, unsigned long end); }; static inline int gmap_is_shadow(struct gmap *gmap) { return !!gmap->parent; } struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit); void gmap_remove(struct gmap *gmap); struct gmap *gmap_get(struct gmap *gmap); void gmap_put(struct gmap *gmap); void gmap_enable(struct gmap *gmap); void gmap_disable(struct gmap *gmap); struct gmap *gmap_get_enabled(void); int gmap_map_segment(struct gmap *gmap, unsigned long from, unsigned long to, unsigned long len); int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len); unsigned long __gmap_translate(struct gmap *, unsigned long gaddr); unsigned long gmap_translate(struct gmap *, unsigned long gaddr); int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr); int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags); void gmap_discard(struct gmap *, unsigned long from, unsigned long to); void __gmap_zap(struct gmap *, unsigned long gaddr); void gmap_unlink(struct mm_struct *, unsigned long *table, unsigned long vmaddr); int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val); struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce, int edat_level); int gmap_shadow_valid(struct gmap *sg, unsigned long asce, int edat_level); int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t, int fake); int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t, int fake); int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, int fake); int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, int fake); int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr, unsigned long *pgt, int *dat_protection, int *fake); int gmap_shadow_page(struct gmap *sg, unsigned long saddr, pte_t pte); void gmap_register_pte_notifier(struct gmap_notifier *); void gmap_unregister_pte_notifier(struct gmap_notifier *); int gmap_mprotect_notify(struct gmap *, unsigned long start, unsigned long len, int prot); void gmap_sync_dirty_log_pmd(struct gmap *gmap, unsigned long dirty_bitmap[4], unsigned long gaddr, unsigned long vmaddr); int gmap_mark_unmergeable(void); void s390_unlist_old_asce(struct gmap *gmap); int s390_replace_asce(struct gmap *gmap); void s390_uv_destroy_pfns(unsigned long count, unsigned long *pfns); int __s390_uv_destroy_range(struct mm_struct *mm, unsigned long start, unsigned long end, bool interruptible); /** * s390_uv_destroy_range - Destroy a range of pages in the given mm. * @mm: the mm on which to operate on * @start: the start of the range * @end: the end of the range * * This function will call cond_sched, so it should not generate stalls, but * it will otherwise only return when it completed. */ static inline void s390_uv_destroy_range(struct mm_struct *mm, unsigned long start, unsigned long end) { (void)__s390_uv_destroy_range(mm, start, end, false); } /** * s390_uv_destroy_range_interruptible - Destroy a range of pages in the * given mm, but stop when a fatal signal is received. * @mm: the mm on which to operate on * @start: the start of the range * @end: the end of the range * * This function will call cond_sched, so it should not generate stalls. If * a fatal signal is received, it will return with -EINTR immediately, * without finishing destroying the whole range. Upon successful * completion, 0 is returned. */ static inline int s390_uv_destroy_range_interruptible(struct mm_struct *mm, unsigned long start, unsigned long end) { return __s390_uv_destroy_range(mm, start, end, true); } #endif /* _ASM_S390_GMAP_H */ |