arch/s390/include/asm/gmap.h

   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  * @crst_list: list of all crst tables used in the guest address space
  14  * @mm: pointer to the parent mm_struct
  15  * @guest_to_host: radix tree with guest to host address translation
  16  * @host_to_guest: radix tree with pointer to segment table entries
  17  * @guest_table_lock: spinlock to protect all entries in the guest page table
  18  * @ref_count: reference counter for the gmap structure
  19  * @table: pointer to the page directory
  20  * @asce: address space control element for gmap page table
  21  * @pfault_enabled: defines if pfaults are applicable for the guest
  22  */
  23 struct gmap {
  24         struct list_head list;
  25         struct list_head crst_list;
  26         struct mm_struct *mm;
  27         struct radix_tree_root guest_to_host;
  28         struct radix_tree_root host_to_guest;
  29         spinlock_t guest_table_lock;
  30         atomic_t ref_count;
  31         unsigned long *table;
  32         unsigned long asce;
  33         unsigned long asce_end;
  34         void *private;
  35         bool pfault_enabled;
  36 };
  37
  38 /**
  39  * struct gmap_notifier - notify function block for page invalidation
  40  * @notifier_call: address of callback function
  41  */
  42 struct gmap_notifier {
  43         struct list_head list;
  44         struct rcu_head rcu;
  45         void (*notifier_call)(struct gmap *gmap, unsigned long start,
  46                               unsigned long end);
  47 };
  48
  49 struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit);
  50 void gmap_remove(struct gmap *gmap);
  51 struct gmap *gmap_get(struct gmap *gmap);
  52 void gmap_put(struct gmap *gmap);
  53
  54 void gmap_enable(struct gmap *gmap);
  55 void gmap_disable(struct gmap *gmap);
  56 int gmap_map_segment(struct gmap *gmap, unsigned long from,
  57                      unsigned long to, unsigned long len);
  58 int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
  59 unsigned long __gmap_translate(struct gmap *, unsigned long gaddr);
  60 unsigned long gmap_translate(struct gmap *, unsigned long gaddr);
  61 int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr);
  62 int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags);
  63 void gmap_discard(struct gmap *, unsigned long from, unsigned long to);
  64 void __gmap_zap(struct gmap *, unsigned long gaddr);
  65 void gmap_unlink(struct mm_struct *, unsigned long *table, unsigned long vmaddr);
  66
  67 void gmap_register_pte_notifier(struct gmap_notifier *);
  68 void gmap_unregister_pte_notifier(struct gmap_notifier *);
  69 void gmap_pte_notify(struct mm_struct *, unsigned long addr, pte_t *);
  70
  71 int gmap_mprotect_notify(struct gmap *, unsigned long start,
  72                          unsigned long len, int prot);
  73
  74 #endif /* _ASM_S390_GMAP_H */