arch/s390/include/asm/gmap.h

   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/radix-tree.h>
  13 #include <linux/refcount.h>
  14
  15 /* Generic bits for GMAP notification on DAT table entry changes. */
  16 #define GMAP_NOTIFY_SHADOW      0x2
  17 #define GMAP_NOTIFY_MPROT       0x1
  18
  19 /* Status bits only for huge segment entries */
  20 #define _SEGMENT_ENTRY_GMAP_IN          0x8000  /* invalidation notify bit */
  21 #define _SEGMENT_ENTRY_GMAP_UC          0x4000  /* dirty (migration) */
  22
  23 /**
  24  * struct gmap_struct - guest address space
  25  * @list: list head for the mm->context gmap list
  26  * @crst_list: list of all crst tables used in the guest address space
  27  * @mm: pointer to the parent mm_struct
  28  * @guest_to_host: radix tree with guest to host address translation
  29  * @host_to_guest: radix tree with pointer to segment table entries
  30  * @guest_table_lock: spinlock to protect all entries in the guest page table
  31  * @ref_count: reference counter for the gmap structure
  32  * @table: pointer to the page directory
  33  * @asce: address space control element for gmap page table
  34  * @pfault_enabled: defines if pfaults are applicable for the guest
  35  * @guest_handle: protected virtual machine handle for the ultravisor
  36  * @host_to_rmap: radix tree with gmap_rmap lists
  37  * @children: list of shadow gmap structures
  38  * @pt_list: list of all page tables used in the shadow guest address space
  39  * @shadow_lock: spinlock to protect the shadow gmap list
  40  * @parent: pointer to the parent gmap for shadow guest address spaces
  41  * @orig_asce: ASCE for which the shadow page table has been created
  42  * @edat_level: edat level to be used for the shadow translation
  43  * @removed: flag to indicate if a shadow guest address space has been removed
  44  * @initialized: flag to indicate if a shadow guest address space can be used
  45  */
  46 struct gmap {
  47         struct list_head list;
  48         struct list_head crst_list;
  49         struct mm_struct *mm;
  50         struct radix_tree_root guest_to_host;
  51         struct radix_tree_root host_to_guest;
  52         spinlock_t guest_table_lock;
  53         refcount_t ref_count;
  54         unsigned long *table;
  55         unsigned long asce;
  56         unsigned long asce_end;
  57         void *private;
  58         bool pfault_enabled;
  59         /* only set for protected virtual machines */
  60         unsigned long guest_handle;
  61         /* Additional data for shadow guest address spaces */
  62         struct radix_tree_root host_to_rmap;
  63         struct list_head children;
  64         struct list_head pt_list;
  65         spinlock_t shadow_lock;
  66         struct gmap *parent;
  67         unsigned long orig_asce;
  68         int edat_level;
  69         bool removed;
  70         bool initialized;
  71 };
  72
  73 /**
  74  * struct gmap_rmap - reverse mapping for shadow page table entries
  75  * @next: pointer to next rmap in the list
  76  * @raddr: virtual rmap address in the shadow guest address space
  77  */
  78 struct gmap_rmap {
  79         struct gmap_rmap *next;
  80         unsigned long raddr;
  81 };
  82
  83 #define gmap_for_each_rmap(pos, head) \
  84         for (pos = (head); pos; pos = pos->next)
  85
  86 #define gmap_for_each_rmap_safe(pos, n, head) \
  87         for (pos = (head); n = pos ? pos->next : NULL, pos; pos = n)
  88
  89 /**
  90  * struct gmap_notifier - notify function block for page invalidation
  91  * @notifier_call: address of callback function
  92  */
  93 struct gmap_notifier {
  94         struct list_head list;
  95         struct rcu_head rcu;
  96         void (*notifier_call)(struct gmap *gmap, unsigned long start,
  97                               unsigned long end);
  98 };
  99
 100 static inline int gmap_is_shadow(struct gmap *gmap)
 101 {
 102         return !!gmap->parent;
 103 }
 104
 105 struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit);
 106 void gmap_remove(struct gmap *gmap);
 107 struct gmap *gmap_get(struct gmap *gmap);
 108 void gmap_put(struct gmap *gmap);
 109
 110 void gmap_enable(struct gmap *gmap);
 111 void gmap_disable(struct gmap *gmap);
 112 struct gmap *gmap_get_enabled(void);
 113 int gmap_map_segment(struct gmap *gmap, unsigned long from,
 114                      unsigned long to, unsigned long len);
 115 int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
 116 unsigned long __gmap_translate(struct gmap *, unsigned long gaddr);
 117 unsigned long gmap_translate(struct gmap *, unsigned long gaddr);
 118 int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr);
 119 int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags);
 120 void gmap_discard(struct gmap *, unsigned long from, unsigned long to);
 121 void __gmap_zap(struct gmap *, unsigned long gaddr);
 122 void gmap_unlink(struct mm_struct *, unsigned long *table, unsigned long vmaddr);
 123
 124 int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val);
 125
 126 struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce,
 127                          int edat_level);
 128 int gmap_shadow_valid(struct gmap *sg, unsigned long asce, int edat_level);
 129 int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t,
 130                     int fake);
 131 int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t,
 132                     int fake);
 133 int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt,
 134                     int fake);
 135 int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
 136                     int fake);
 137 int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr,
 138                            unsigned long *pgt, int *dat_protection, int *fake);
 139 int gmap_shadow_page(struct gmap *sg, unsigned long saddr, pte_t pte);
 140
 141 void gmap_register_pte_notifier(struct gmap_notifier *);
 142 void gmap_unregister_pte_notifier(struct gmap_notifier *);
 143
 144 int gmap_mprotect_notify(struct gmap *, unsigned long start,
 145                          unsigned long len, int prot);
 146
 147 void gmap_sync_dirty_log_pmd(struct gmap *gmap, unsigned long dirty_bitmap[4],
 148                              unsigned long gaddr, unsigned long vmaddr);
 149 int gmap_mark_unmergeable(void);
 150 void s390_reset_acc(struct mm_struct *mm);
 151 #endif /* _ASM_S390_GMAP_H */