diff options
Diffstat (limited to 'arch/s390/include/asm/gmap.h')
| -rw-r--r-- | arch/s390/include/asm/gmap.h | 82 |
1 files changed, 76 insertions, 6 deletions
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h index d054c1b07a3c..741ddba0bf11 100644 --- a/arch/s390/include/asm/gmap.h +++ b/arch/s390/include/asm/gmap.h @@ -10,14 +10,25 @@ /** * 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 + * @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; @@ -26,26 +37,64 @@ struct gmap { struct radix_tree_root guest_to_host; struct radix_tree_root host_to_guest; spinlock_t guest_table_lock; + atomic_t ref_count; unsigned long *table; unsigned long asce; unsigned long asce_end; void *private; bool pfault_enabled; + /* 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; - void (*notifier_call)(struct gmap *gmap, unsigned long gaddr); + struct rcu_head rcu; + void (*notifier_call)(struct gmap *gmap, unsigned long start, + unsigned long end); }; -struct gmap *gmap_alloc(struct mm_struct *mm, unsigned long limit); -void gmap_free(struct gmap *gmap); +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); @@ -57,8 +106,29 @@ 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); -void gmap_register_ipte_notifier(struct gmap_notifier *); -void gmap_unregister_ipte_notifier(struct gmap_notifier *); -int gmap_ipte_notify(struct gmap *, unsigned long start, unsigned long len); +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 *); +void gmap_pte_notify(struct mm_struct *, unsigned long addr, pte_t *, + unsigned long bits); + +int gmap_mprotect_notify(struct gmap *, unsigned long start, + unsigned long len, int prot); #endif /* _ASM_S390_GMAP_H */ |