1 files changed, 64 insertions, 0 deletions
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h
new file mode 100644
index 000000000000..d054c1b07a3c
--- /dev/null
+++ b/arch/s390/include/asm/gmap.h
@@ -0,0 +1,64 @@
+/*
+ *  KVM guest address space mapping code
+ *
+ *    Copyright IBM Corp. 2007, 2016
+ *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#ifndef _ASM_S390_GMAP_H
+#define _ASM_S390_GMAP_H
+
+/**
+ * struct gmap_struct - guest address space
+ * @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
+ * @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
+ */
+struct gmap {
+	struct list_head list;
+	struct list_head crst_list;
+	struct mm_struct *mm;
+	struct radix_tree_root guest_to_host;
+	struct radix_tree_root host_to_guest;
+	spinlock_t guest_table_lock;
+	unsigned long *table;
+	unsigned long asce;
+	unsigned long asce_end;
+	void *private;
+	bool pfault_enabled;
+};
+
+/**
+ * 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 gmap *gmap_alloc(struct mm_struct *mm, unsigned long limit);
+void gmap_free(struct gmap *gmap);
+void gmap_enable(struct gmap *gmap);
+void gmap_disable(struct gmap *gmap);
+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);
+unsigned long __gmap_translate(struct gmap *, unsigned long gaddr);
+unsigned long gmap_translate(struct gmap *, unsigned long gaddr);
+int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr);
+int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags);
+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);
+
+#endif /* _ASM_S390_GMAP_H */