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  * @table: pointer to the page directory
  19  * @asce: address space control element for gmap page table
  20  * @pfault_enabled: defines if pfaults are applicable for the guest
  21  */
  22 struct gmap {
  23         struct list_head list;
  24         struct list_head crst_list;
  25         struct mm_struct *mm;
  26         struct radix_tree_root guest_to_host;
  27         struct radix_tree_root host_to_guest;
  28         spinlock_t guest_table_lock;
  29         unsigned long *table;
  30         unsigned long asce;
  31         unsigned long asce_end;
  32         void *private;
  33         bool pfault_enabled;
  34 };
  35
  36 /**
  37  * struct gmap_notifier - notify function block for page invalidation
  38  * @notifier_call: address of callback function
  39  */
  40 struct gmap_notifier {
  41         struct list_head list;
  42         struct rcu_head rcu;
  43         void (*notifier_call)(struct gmap *gmap, unsigned long start,
  44                               unsigned long end);
  45 };
  46
  47 struct gmap *gmap_alloc(struct mm_struct *mm, unsigned long limit);
  48 void gmap_free(struct gmap *gmap);
  49 void gmap_enable(struct gmap *gmap);
  50 void gmap_disable(struct gmap *gmap);
  51 int gmap_map_segment(struct gmap *gmap, unsigned long from,
  52                      unsigned long to, unsigned long len);
  53 int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
  54 unsigned long __gmap_translate(struct gmap *, unsigned long gaddr);
  55 unsigned long gmap_translate(struct gmap *, unsigned long gaddr);
  56 int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr);
  57 int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags);
  58 void gmap_discard(struct gmap *, unsigned long from, unsigned long to);
  59 void __gmap_zap(struct gmap *, unsigned long gaddr);
  60 void gmap_unlink(struct mm_struct *, unsigned long *table, unsigned long vmaddr);
  61
  62 void gmap_register_pte_notifier(struct gmap_notifier *);
  63 void gmap_unregister_pte_notifier(struct gmap_notifier *);
  64 void gmap_pte_notify(struct mm_struct *, unsigned long addr, pte_t *);
  65
  66 int gmap_mprotect_notify(struct gmap *, unsigned long start,
  67                          unsigned long len, int prot);
  68
  69 #endif /* _ASM_S390_GMAP_H */