Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull more s390 updates from Martin Schwidefsky:
 "This is the second batch of s390 patches for the 3.10 merge window.

  Heiko improved the memory detection, this fixes kdump for large memory
  sizes.  Some kvm related memory management work, new ipldev/condev
  keywords in cio and bug fixes."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/mem_detect: remove artificial kdump memory types
  s390/mm: add pte invalidation notifier for kvm
  s390/zcrypt: ap bus rescan problem when toggle crypto adapters on/off
  s390/memory hotplug,sclp: get rid of per memory increment usecount
  s390/memory hotplug: provide memory_block_size_bytes() function
  s390/mem_detect: limit memory detection loop to "mem=" parameter
  s390/kdump,bootmem: fix bootmem allocator bitmap size
  s390: get rid of odd global real_memory_size
  s390/kvm: Change the virtual memory mapping location for Virtio devices
  s390/zcore: calculate real memory size using own get_mem_size function
  s390/mem_detect: add DAT sanity check
  s390/mem_detect: fix lockdep irq tracing
  s390/mem_detect: move memory detection code to mm folder
  s390/zfcpdump: exploit new cio_ignore keywords
  s390/cio: add condev keyword to cio_ignore
  s390/cio: add ipldev keyword to cio_ignore
  s390/uaccess: add "fallthrough" comments

1 files changed, 56 insertions, 10 deletions

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index b4622915bd15..4105b8221fdd 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -306,6 +306,7 @@ extern unsigned long MODULES_END;
 #define RCP_HC_BIT	0x00200000UL
 #define RCP_GR_BIT	0x00040000UL
 #define RCP_GC_BIT	0x00020000UL
+#define RCP_IN_BIT	0x00008000UL	/* IPTE notify bit */
 
 /* User dirty / referenced bit for KVM's migration feature */
 #define KVM_UR_BIT	0x00008000UL
@@ -373,6 +374,7 @@ extern unsigned long MODULES_END;
 #define RCP_HC_BIT	0x0020000000000000UL
 #define RCP_GR_BIT	0x0004000000000000UL
 #define RCP_GC_BIT	0x0002000000000000UL
+#define RCP_IN_BIT	0x0000800000000000UL	/* IPTE notify bit */
 
 /* User dirty / referenced bit for KVM's migration feature */
 #define KVM_UR_BIT	0x0000800000000000UL
@@ -746,30 +748,42 @@ struct gmap {
 
 /**
  * struct gmap_rmap - reverse mapping for segment table entries
- * @next: pointer to the next gmap_rmap structure in the list
+ * @gmap: pointer to the gmap_struct
  * @entry: pointer to a segment table entry
+ * @vmaddr: virtual address in the guest address space
  */
 struct gmap_rmap {
 	struct list_head list;
+	struct gmap *gmap;
 	unsigned long *entry;
+	unsigned long vmaddr;
 };
 
 /**
  * struct gmap_pgtable - gmap information attached to a page table
  * @vmaddr: address of the 1MB segment in the process virtual memory
- * @mapper: list of segment table entries maping a page table
+ * @mapper: list of segment table entries mapping a page table
  */
 struct gmap_pgtable {
 	unsigned long vmaddr;
 	struct list_head mapper;
 };
 
+/**
+ * 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 address);
+};
+
 struct gmap *gmap_alloc(struct mm_struct *mm);
 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 length);
+		     unsigned long to, unsigned long len);
 int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
 unsigned long __gmap_translate(unsigned long address, struct gmap *);
 unsigned long gmap_translate(unsigned long address, struct gmap *);
@@ -777,6 +791,24 @@ unsigned long __gmap_fault(unsigned long address, struct gmap *);
 unsigned long gmap_fault(unsigned long address, struct gmap *);
 void gmap_discard(unsigned long from, unsigned long to, struct gmap *);
 
+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);
+void gmap_do_ipte_notify(struct mm_struct *, unsigned long addr, pte_t *);
+
+static inline pgste_t pgste_ipte_notify(struct mm_struct *mm,
+					unsigned long addr,
+					pte_t *ptep, pgste_t pgste)
+{
+#ifdef CONFIG_PGSTE
+	if (pgste_val(pgste) & RCP_IN_BIT) {
+		pgste_val(pgste) &= ~RCP_IN_BIT;
+		gmap_do_ipte_notify(mm, addr, ptep);
+	}
+#endif
+	return pgste;
+}
+
 /*
  * Certain architectures need to do special things when PTEs
  * within a page table are directly modified.  Thus, the following
@@ -1032,8 +1064,10 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 	pte_t pte;
 
 	mm->context.flush_mm = 1;
-	if (mm_has_pgste(mm))
+	if (mm_has_pgste(mm)) {
 		pgste = pgste_get_lock(ptep);
+		pgste = pgste_ipte_notify(mm, address, ptep, pgste);
+	}
 
 	pte = *ptep;
 	if (!mm_exclusive(mm))
@@ -1052,11 +1086,14 @@ static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
 					   unsigned long address,
 					   pte_t *ptep)
 {
+	pgste_t pgste;
 	pte_t pte;
 
 	mm->context.flush_mm = 1;
-	if (mm_has_pgste(mm))
-		pgste_get_lock(ptep);
+	if (mm_has_pgste(mm)) {
+		pgste = pgste_get_lock(ptep);
+		pgste_ipte_notify(mm, address, ptep, pgste);
+	}
 
 	pte = *ptep;
 	if (!mm_exclusive(mm))
@@ -1082,8 +1119,10 @@ static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
 	pgste_t pgste;
 	pte_t pte;
 
-	if (mm_has_pgste(vma->vm_mm))
+	if (mm_has_pgste(vma->vm_mm)) {
 		pgste = pgste_get_lock(ptep);
+		pgste = pgste_ipte_notify(vma->vm_mm, address, ptep, pgste);
+	}
 
 	pte = *ptep;
 	__ptep_ipte(address, ptep);
@@ -1111,8 +1150,11 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 	pgste_t pgste;
 	pte_t pte;
 
-	if (mm_has_pgste(mm))
+	if (mm_has_pgste(mm)) {
 		pgste = pgste_get_lock(ptep);
+		if (!full)
+			pgste = pgste_ipte_notify(mm, address, ptep, pgste);
+	}
 
 	pte = *ptep;
 	if (!full)
@@ -1135,8 +1177,10 @@ static inline pte_t ptep_set_wrprotect(struct mm_struct *mm,
 
 	if (pte_write(pte)) {
 		mm->context.flush_mm = 1;
-		if (mm_has_pgste(mm))
+		if (mm_has_pgste(mm)) {
 			pgste = pgste_get_lock(ptep);
+			pgste = pgste_ipte_notify(mm, address, ptep, pgste);
+		}
 
 		if (!mm_exclusive(mm))
 			__ptep_ipte(address, ptep);
@@ -1160,8 +1204,10 @@ static inline int ptep_set_access_flags(struct vm_area_struct *vma,
 
 	if (pte_same(*ptep, entry))
 		return 0;
-	if (mm_has_pgste(vma->vm_mm))
+	if (mm_has_pgste(vma->vm_mm)) {
 		pgste = pgste_get_lock(ptep);
+		pgste = pgste_ipte_notify(vma->vm_mm, address, ptep, pgste);
+	}
 
 	__ptep_ipte(address, ptep);