2 * KVM guest address space mapping code
4 * Copyright IBM Corp. 2007, 2016
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
8 #ifndef _ASM_S390_GMAP_H
9 #define _ASM_S390_GMAP_H
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 * @removed: flag to indicate if a shadow guest address space has been removed
32 struct list_head list;
33 struct list_head crst_list;
35 struct radix_tree_root guest_to_host;
36 struct radix_tree_root host_to_guest;
37 spinlock_t guest_table_lock;
41 unsigned long asce_end;
44 /* Additional data for shadow guest address spaces */
45 struct radix_tree_root host_to_rmap;
46 struct list_head children;
47 struct list_head pt_list;
48 spinlock_t shadow_lock;
50 unsigned long orig_asce;
55 * struct gmap_rmap - reverse mapping for shadow page table entries
56 * @next: pointer to next rmap in the list
57 * @raddr: virtual rmap address in the shadow guest address space
60 struct gmap_rmap *next;
64 #define gmap_for_each_rmap(pos, head) \
65 for (pos = (head); pos; pos = pos->next)
67 #define gmap_for_each_rmap_safe(pos, n, head) \
68 for (pos = (head); n = pos ? pos->next : NULL, pos; pos = n)
71 * struct gmap_notifier - notify function block for page invalidation
72 * @notifier_call: address of callback function
74 struct gmap_notifier {
75 struct list_head list;
77 void (*notifier_call)(struct gmap *gmap, unsigned long start,
81 static inline int gmap_is_shadow(struct gmap *gmap)
83 return !!gmap->parent;
86 struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit);
87 void gmap_remove(struct gmap *gmap);
88 struct gmap *gmap_get(struct gmap *gmap);
89 void gmap_put(struct gmap *gmap);
91 void gmap_enable(struct gmap *gmap);
92 void gmap_disable(struct gmap *gmap);
93 int gmap_map_segment(struct gmap *gmap, unsigned long from,
94 unsigned long to, unsigned long len);
95 int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
96 unsigned long __gmap_translate(struct gmap *, unsigned long gaddr);
97 unsigned long gmap_translate(struct gmap *, unsigned long gaddr);
98 int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr);
99 int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags);
100 void gmap_discard(struct gmap *, unsigned long from, unsigned long to);
101 void __gmap_zap(struct gmap *, unsigned long gaddr);
102 void gmap_unlink(struct mm_struct *, unsigned long *table, unsigned long vmaddr);
104 int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val);
106 struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce);
107 int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t);
108 int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t);
109 int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt);
110 int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt);
111 int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr,
112 unsigned long *pgt, int *dat_protection);
113 int gmap_shadow_page(struct gmap *sg, unsigned long saddr,
114 unsigned long paddr, int write);
116 void gmap_register_pte_notifier(struct gmap_notifier *);
117 void gmap_unregister_pte_notifier(struct gmap_notifier *);
118 void gmap_pte_notify(struct mm_struct *, unsigned long addr, pte_t *,
121 int gmap_mprotect_notify(struct gmap *, unsigned long start,
122 unsigned long len, int prot);
124 #endif /* _ASM_S390_GMAP_H */