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Diffstat (limited to 'arch/s390/include/asm/pgtable.h')
-rw-r--r--arch/s390/include/asm/pgtable.h169
1 files changed, 81 insertions, 88 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 12f75313e086..fcba5e03839f 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -309,7 +309,8 @@ extern unsigned long MODULES_END;
#define PGSTE_HC_BIT 0x00200000UL
#define PGSTE_GR_BIT 0x00040000UL
#define PGSTE_GC_BIT 0x00020000UL
-#define PGSTE_IN_BIT 0x00008000UL /* IPTE notify bit */
+#define PGSTE_UC_BIT 0x00008000UL /* user dirty (migration) */
+#define PGSTE_IN_BIT 0x00004000UL /* IPTE notify bit */
#else /* CONFIG_64BIT */
@@ -391,7 +392,8 @@ extern unsigned long MODULES_END;
#define PGSTE_HC_BIT 0x0020000000000000UL
#define PGSTE_GR_BIT 0x0004000000000000UL
#define PGSTE_GC_BIT 0x0002000000000000UL
-#define PGSTE_IN_BIT 0x0000800000000000UL /* IPTE notify bit */
+#define PGSTE_UC_BIT 0x0000800000000000UL /* user dirty (migration) */
+#define PGSTE_IN_BIT 0x0000400000000000UL /* IPTE notify bit */
#endif /* CONFIG_64BIT */
@@ -466,6 +468,16 @@ static inline int mm_has_pgste(struct mm_struct *mm)
#endif
return 0;
}
+
+static inline int mm_use_skey(struct mm_struct *mm)
+{
+#ifdef CONFIG_PGSTE
+ if (mm->context.use_skey)
+ return 1;
+#endif
+ return 0;
+}
+
/*
* pgd/pmd/pte query functions
*/
@@ -699,26 +711,17 @@ static inline void pgste_set(pte_t *ptep, pgste_t pgste)
#endif
}
-static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
+static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste,
+ struct mm_struct *mm)
{
#ifdef CONFIG_PGSTE
unsigned long address, bits, skey;
- if (pte_val(*ptep) & _PAGE_INVALID)
+ if (!mm_use_skey(mm) || pte_val(*ptep) & _PAGE_INVALID)
return pgste;
address = pte_val(*ptep) & PAGE_MASK;
skey = (unsigned long) page_get_storage_key(address);
bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
- if (!(pgste_val(pgste) & PGSTE_HC_BIT) && (bits & _PAGE_CHANGED)) {
- /* Transfer dirty + referenced bit to host bits in pgste */
- pgste_val(pgste) |= bits << 52;
- page_set_storage_key(address, skey ^ bits, 0);
- } else if (!(pgste_val(pgste) & PGSTE_HR_BIT) &&
- (bits & _PAGE_REFERENCED)) {
- /* Transfer referenced bit to host bit in pgste */
- pgste_val(pgste) |= PGSTE_HR_BIT;
- page_reset_referenced(address);
- }
/* Transfer page changed & referenced bit to guest bits in pgste */
pgste_val(pgste) |= bits << 48; /* GR bit & GC bit */
/* Copy page access key and fetch protection bit to pgste */
@@ -729,25 +732,14 @@ static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
}
-static inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste)
-{
-#ifdef CONFIG_PGSTE
- if (pte_val(*ptep) & _PAGE_INVALID)
- return pgste;
- /* Get referenced bit from storage key */
- if (page_reset_referenced(pte_val(*ptep) & PAGE_MASK))
- pgste_val(pgste) |= PGSTE_HR_BIT | PGSTE_GR_BIT;
-#endif
- return pgste;
-}
-
-static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry)
+static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry,
+ struct mm_struct *mm)
{
#ifdef CONFIG_PGSTE
unsigned long address;
unsigned long nkey;
- if (pte_val(entry) & _PAGE_INVALID)
+ if (!mm_use_skey(mm) || pte_val(entry) & _PAGE_INVALID)
return;
VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID));
address = pte_val(entry) & PAGE_MASK;
@@ -757,23 +749,30 @@ static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry)
* key C/R to 0.
*/
nkey = (pgste_val(pgste) & (PGSTE_ACC_BITS | PGSTE_FP_BIT)) >> 56;
+ nkey |= (pgste_val(pgste) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 48;
page_set_storage_key(address, nkey, 0);
#endif
}
-static inline void pgste_set_pte(pte_t *ptep, pte_t entry)
+static inline pgste_t pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry)
{
- if (!MACHINE_HAS_ESOP &&
- (pte_val(entry) & _PAGE_PRESENT) &&
- (pte_val(entry) & _PAGE_WRITE)) {
- /*
- * Without enhanced suppression-on-protection force
- * the dirty bit on for all writable ptes.
- */
- pte_val(entry) |= _PAGE_DIRTY;
- pte_val(entry) &= ~_PAGE_PROTECT;
+ if ((pte_val(entry) & _PAGE_PRESENT) &&
+ (pte_val(entry) & _PAGE_WRITE) &&
+ !(pte_val(entry) & _PAGE_INVALID)) {
+ if (!MACHINE_HAS_ESOP) {
+ /*
+ * Without enhanced suppression-on-protection force
+ * the dirty bit on for all writable ptes.
+ */
+ pte_val(entry) |= _PAGE_DIRTY;
+ pte_val(entry) &= ~_PAGE_PROTECT;
+ }
+ if (!(pte_val(entry) & _PAGE_PROTECT))
+ /* This pte allows write access, set user-dirty */
+ pgste_val(pgste) |= PGSTE_UC_BIT;
}
*ptep = entry;
+ return pgste;
}
/**
@@ -839,6 +838,8 @@ 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_zap(unsigned long address, struct gmap *);
+bool gmap_test_and_clear_dirty(unsigned long address, struct gmap *);
+
void gmap_register_ipte_notifier(struct gmap_notifier *);
void gmap_unregister_ipte_notifier(struct gmap_notifier *);
@@ -870,8 +871,8 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
if (mm_has_pgste(mm)) {
pgste = pgste_get_lock(ptep);
pgste_val(pgste) &= ~_PGSTE_GPS_ZERO;
- pgste_set_key(ptep, pgste, entry);
- pgste_set_pte(ptep, entry);
+ pgste_set_key(ptep, pgste, entry, mm);
+ pgste = pgste_set_pte(ptep, pgste, entry);
pgste_set_unlock(ptep, pgste);
} else {
if (!(pte_val(entry) & _PAGE_INVALID) && MACHINE_HAS_EDAT1)
@@ -1017,45 +1018,6 @@ static inline pte_t pte_mkhuge(pte_t pte)
}
#endif
-/*
- * Get (and clear) the user dirty bit for a pte.
- */
-static inline int ptep_test_and_clear_user_dirty(struct mm_struct *mm,
- pte_t *ptep)
-{
- pgste_t pgste;
- int dirty = 0;
-
- if (mm_has_pgste(mm)) {
- pgste = pgste_get_lock(ptep);
- pgste = pgste_update_all(ptep, pgste);
- dirty = !!(pgste_val(pgste) & PGSTE_HC_BIT);
- pgste_val(pgste) &= ~PGSTE_HC_BIT;
- pgste_set_unlock(ptep, pgste);
- return dirty;
- }
- return dirty;
-}
-
-/*
- * Get (and clear) the user referenced bit for a pte.
- */
-static inline int ptep_test_and_clear_user_young(struct mm_struct *mm,
- pte_t *ptep)
-{
- pgste_t pgste;
- int young = 0;
-
- if (mm_has_pgste(mm)) {
- pgste = pgste_get_lock(ptep);
- pgste = pgste_update_young(ptep, pgste);
- young = !!(pgste_val(pgste) & PGSTE_HR_BIT);
- pgste_val(pgste) &= ~PGSTE_HR_BIT;
- pgste_set_unlock(ptep, pgste);
- }
- return young;
-}
-
static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
{
unsigned long pto = (unsigned long) ptep;
@@ -1118,6 +1080,36 @@ static inline void ptep_flush_lazy(struct mm_struct *mm,
atomic_sub(0x10000, &mm->context.attach_count);
}
+/*
+ * Get (and clear) the user dirty bit for a pte.
+ */
+static inline int ptep_test_and_clear_user_dirty(struct mm_struct *mm,
+ unsigned long addr,
+ pte_t *ptep)
+{
+ pgste_t pgste;
+ pte_t pte;
+ int dirty;
+
+ if (!mm_has_pgste(mm))
+ return 0;
+ pgste = pgste_get_lock(ptep);
+ dirty = !!(pgste_val(pgste) & PGSTE_UC_BIT);
+ pgste_val(pgste) &= ~PGSTE_UC_BIT;
+ pte = *ptep;
+ if (dirty && (pte_val(pte) & _PAGE_PRESENT)) {
+ pgste = pgste_ipte_notify(mm, ptep, pgste);
+ __ptep_ipte(addr, ptep);
+ if (MACHINE_HAS_ESOP || !(pte_val(pte) & _PAGE_WRITE))
+ pte_val(pte) |= _PAGE_PROTECT;
+ else
+ pte_val(pte) |= _PAGE_INVALID;
+ *ptep = pte;
+ }
+ pgste_set_unlock(ptep, pgste);
+ return dirty;
+}
+
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
@@ -1137,7 +1129,7 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
pte = pte_mkold(pte);
if (mm_has_pgste(vma->vm_mm)) {
- pgste_set_pte(ptep, pte);
+ pgste = pgste_set_pte(ptep, pgste, pte);
pgste_set_unlock(ptep, pgste);
} else
*ptep = pte;
@@ -1182,7 +1174,7 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
pte_val(*ptep) = _PAGE_INVALID;
if (mm_has_pgste(mm)) {
- pgste = pgste_update_all(&pte, pgste);
+ pgste = pgste_update_all(&pte, pgste, mm);
pgste_set_unlock(ptep, pgste);
}
return pte;
@@ -1205,7 +1197,7 @@ static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
ptep_flush_lazy(mm, address, ptep);
if (mm_has_pgste(mm)) {
- pgste = pgste_update_all(&pte, pgste);
+ pgste = pgste_update_all(&pte, pgste, mm);
pgste_set(ptep, pgste);
}
return pte;
@@ -1219,8 +1211,8 @@ static inline void ptep_modify_prot_commit(struct mm_struct *mm,
if (mm_has_pgste(mm)) {
pgste = pgste_get(ptep);
- pgste_set_key(ptep, pgste, pte);
- pgste_set_pte(ptep, pte);
+ pgste_set_key(ptep, pgste, pte, mm);
+ pgste = pgste_set_pte(ptep, pgste, pte);
pgste_set_unlock(ptep, pgste);
} else
*ptep = pte;
@@ -1246,7 +1238,7 @@ static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
if ((pgste_val(pgste) & _PGSTE_GPS_USAGE_MASK) ==
_PGSTE_GPS_USAGE_UNUSED)
pte_val(pte) |= _PAGE_UNUSED;
- pgste = pgste_update_all(&pte, pgste);
+ pgste = pgste_update_all(&pte, pgste, vma->vm_mm);
pgste_set_unlock(ptep, pgste);
}
return pte;
@@ -1278,7 +1270,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
pte_val(*ptep) = _PAGE_INVALID;
if (!full && mm_has_pgste(mm)) {
- pgste = pgste_update_all(&pte, pgste);
+ pgste = pgste_update_all(&pte, pgste, mm);
pgste_set_unlock(ptep, pgste);
}
return pte;
@@ -1301,7 +1293,7 @@ static inline pte_t ptep_set_wrprotect(struct mm_struct *mm,
pte = pte_wrprotect(pte);
if (mm_has_pgste(mm)) {
- pgste_set_pte(ptep, pte);
+ pgste = pgste_set_pte(ptep, pgste, pte);
pgste_set_unlock(ptep, pgste);
} else
*ptep = pte;
@@ -1326,7 +1318,7 @@ static inline int ptep_set_access_flags(struct vm_area_struct *vma,
ptep_flush_direct(vma->vm_mm, address, ptep);
if (mm_has_pgste(vma->vm_mm)) {
- pgste_set_pte(ptep, entry);
+ pgste = pgste_set_pte(ptep, pgste, entry);
pgste_set_unlock(ptep, pgste);
} else
*ptep = entry;
@@ -1734,6 +1726,7 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
extern int vmem_add_mapping(unsigned long start, unsigned long size);
extern int vmem_remove_mapping(unsigned long start, unsigned long size);
extern int s390_enable_sie(void);
+extern void s390_enable_skey(void);
/*
* No page table caches to initialise