diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 374 | ||||
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 2 | ||||
| -rw-r--r-- | arch/s390/mm/pgtable.c | 295 |
3 files changed, 318 insertions, 353 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 7be9ae808a8b..d102c4e23f91 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -680,69 +680,8 @@ static inline void pgste_set(pte_t *ptep, pgste_t pgste) #endif } -static inline pgste_t pgste_update_all(pte_t pte, pgste_t pgste, - struct mm_struct *mm) -{ -#ifdef CONFIG_PGSTE - unsigned long address, bits, skey; - - if (!mm_use_skey(mm) || pte_val(pte) & _PAGE_INVALID) - return pgste; - address = pte_val(pte) & PAGE_MASK; - skey = (unsigned long) page_get_storage_key(address); - bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED); - /* 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 */ - pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT); - pgste_val(pgste) |= (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56; -#endif - return pgste; - -} - -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 (!mm_use_skey(mm) || pte_val(entry) & _PAGE_INVALID) - return; - VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID)); - address = pte_val(entry) & PAGE_MASK; - /* - * Set page access key and fetch protection bit from pgste. - * The guest C/R information is still in the PGSTE, set real - * 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 pgste_t pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry) -{ - 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; -} +bool pgste_test_and_clear_dirty(struct mm_struct *, unsigned long address); +void ptep_ipte_notify(struct mm_struct *, unsigned long addr, pte_t *); /** * struct gmap_struct - guest address space @@ -791,47 +730,11 @@ 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); -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 *); 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) & PGSTE_IN_BIT) { - pgste_val(pgste) &= ~PGSTE_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 - * hook is made available. - */ -static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, - pte_t *ptep, pte_t entry) -{ - pgste_t pgste; - - if (mm_has_pgste(mm)) { - pgste = pgste_get_lock(ptep); - pgste_val(pgste) &= ~_PGSTE_GPS_ZERO; - pgste_set_key(ptep, pgste, entry, mm); - pgste = pgste_set_pte(ptep, pgste, entry); - pgste_set_unlock(ptep, pgste); - } else { - *ptep = entry; - } -} /* * query functions pte_write/pte_dirty/pte_young only work if @@ -998,95 +901,30 @@ static inline void __ptep_ipte_range(unsigned long address, int nr, pte_t *ptep) } while (nr != 255); } -static inline void ptep_flush_direct(struct mm_struct *mm, - unsigned long address, pte_t *ptep) -{ - int active, count; - - if (pte_val(*ptep) & _PAGE_INVALID) - return; - active = (mm == current->active_mm) ? 1 : 0; - count = atomic_add_return(0x10000, &mm->context.attach_count); - if (MACHINE_HAS_TLB_LC && (count & 0xffff) <= active && - cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) - __ptep_ipte_local(address, ptep); - else - __ptep_ipte(address, ptep); - atomic_sub(0x10000, &mm->context.attach_count); -} - -static inline void ptep_flush_lazy(struct mm_struct *mm, - unsigned long address, pte_t *ptep) -{ - int active, count; - - if (pte_val(*ptep) & _PAGE_INVALID) - return; - active = (mm == current->active_mm) ? 1 : 0; - count = atomic_add_return(0x10000, &mm->context.attach_count); - if ((count & 0xffff) <= active) { - pte_val(*ptep) |= _PAGE_INVALID; - mm->context.flush_mm = 1; - } else - __ptep_ipte(address, ptep); - atomic_sub(0x10000, &mm->context.attach_count); -} - /* - * Get (and clear) the user dirty bit for a pte. + * This is hard to understand. ptep_get_and_clear and ptep_clear_flush + * both clear the TLB for the unmapped pte. The reason is that + * ptep_get_and_clear is used in common code (e.g. change_pte_range) + * to modify an active pte. The sequence is + * 1) ptep_get_and_clear + * 2) set_pte_at + * 3) flush_tlb_range + * On s390 the tlb needs to get flushed with the modification of the pte + * if the pte is active. The only way how this can be implemented is to + * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range + * is a nop. */ -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, addr, 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; -} +pte_t ptep_xchg_direct(struct mm_struct *, unsigned long, pte_t *, pte_t); +pte_t ptep_xchg_lazy(struct mm_struct *, unsigned long, pte_t *, pte_t); #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) { - pgste_t pgste; - pte_t pte; - int young; - - if (mm_has_pgste(vma->vm_mm)) { - pgste = pgste_get_lock(ptep); - pgste = pgste_ipte_notify(vma->vm_mm, addr, ptep, pgste); - } - - pte = *ptep; - ptep_flush_direct(vma->vm_mm, addr, ptep); - young = pte_young(pte); - - if (mm_has_pgste(vma->vm_mm)) { - pgste = pgste_update_all(pte, pgste, vma->vm_mm); - pgste = pgste_set_pte(ptep, pgste, pte_mkold(pte)); - pgste_set_unlock(ptep, pgste); - } else - *ptep = pte_mkold(pte); + pte_t pte = *ptep; - return young; + pte = ptep_xchg_direct(vma->vm_mm, addr, ptep, pte_mkold(pte)); + return pte_young(pte); } #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH @@ -1096,104 +934,22 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, return ptep_test_and_clear_young(vma, address, ptep); } -/* - * This is hard to understand. ptep_get_and_clear and ptep_clear_flush - * both clear the TLB for the unmapped pte. The reason is that - * ptep_get_and_clear is used in common code (e.g. change_pte_range) - * to modify an active pte. The sequence is - * 1) ptep_get_and_clear - * 2) set_pte_at - * 3) flush_tlb_range - * On s390 the tlb needs to get flushed with the modification of the pte - * if the pte is active. The only way how this can be implemented is to - * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range - * is a nop. - */ #define __HAVE_ARCH_PTEP_GET_AND_CLEAR static inline pte_t ptep_get_and_clear(struct mm_struct *mm, - unsigned long address, pte_t *ptep) + unsigned long addr, pte_t *ptep) { - pgste_t pgste; - pte_t pte; - - if (mm_has_pgste(mm)) { - pgste = pgste_get_lock(ptep); - pgste = pgste_ipte_notify(mm, address, ptep, pgste); - } - - pte = *ptep; - ptep_flush_lazy(mm, address, ptep); - pte_val(*ptep) = _PAGE_INVALID; - - if (mm_has_pgste(mm)) { - pgste = pgste_update_all(pte, pgste, mm); - pgste_set_unlock(ptep, pgste); - } - return pte; + return ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID)); } #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION -static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, - unsigned long address, - pte_t *ptep) -{ - pgste_t pgste; - pte_t pte; - - if (mm_has_pgste(mm)) { - pgste = pgste_get_lock(ptep); - pgste_ipte_notify(mm, address, ptep, pgste); - } - - pte = *ptep; - ptep_flush_lazy(mm, address, ptep); - - if (mm_has_pgste(mm)) { - pgste = pgste_update_all(pte, pgste, mm); - pgste_set(ptep, pgste); - } - return pte; -} - -static inline void ptep_modify_prot_commit(struct mm_struct *mm, - unsigned long address, - pte_t *ptep, pte_t pte) -{ - pgste_t pgste; - - if (mm_has_pgste(mm)) { - pgste = pgste_get(ptep); - pgste_set_key(ptep, pgste, pte, mm); - pgste = pgste_set_pte(ptep, pgste, pte); - pgste_set_unlock(ptep, pgste); - } else - *ptep = pte; -} +pte_t ptep_modify_prot_start(struct mm_struct *, unsigned long, pte_t *); +void ptep_modify_prot_commit(struct mm_struct *, unsigned long, pte_t *, pte_t); #define __HAVE_ARCH_PTEP_CLEAR_FLUSH static inline pte_t ptep_clear_flush(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep) + unsigned long addr, pte_t *ptep) { - pgste_t pgste; - pte_t pte; - - 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_flush_direct(vma->vm_mm, address, ptep); - pte_val(*ptep) = _PAGE_INVALID; - - if (mm_has_pgste(vma->vm_mm)) { - if ((pgste_val(pgste) & _PGSTE_GPS_USAGE_MASK) == - _PGSTE_GPS_USAGE_UNUSED) - pte_val(pte) |= _PAGE_UNUSED; - pgste = pgste_update_all(pte, pgste, vma->vm_mm); - pgste_set_unlock(ptep, pgste); - } - return pte; + return ptep_xchg_direct(vma->vm_mm, addr, ptep, __pte(_PAGE_INVALID)); } /* @@ -1205,80 +961,52 @@ static inline pte_t ptep_clear_flush(struct vm_area_struct *vma, */ #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, - unsigned long address, + unsigned long addr, pte_t *ptep, int full) { - pgste_t pgste; - pte_t pte; - - if (!full && mm_has_pgste(mm)) { - pgste = pgste_get_lock(ptep); - pgste = pgste_ipte_notify(mm, address, ptep, pgste); - } - - pte = *ptep; - if (!full) - ptep_flush_lazy(mm, address, ptep); - pte_val(*ptep) = _PAGE_INVALID; - - if (!full && mm_has_pgste(mm)) { - pgste = pgste_update_all(pte, pgste, mm); - pgste_set_unlock(ptep, pgste); + if (full) { + pte_t pte = *ptep; + *ptep = __pte(_PAGE_INVALID); + return pte; } - return pte; + return ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID)); } #define __HAVE_ARCH_PTEP_SET_WRPROTECT -static inline pte_t ptep_set_wrprotect(struct mm_struct *mm, - unsigned long address, pte_t *ptep) +static inline void ptep_set_wrprotect(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) { - pgste_t pgste; pte_t pte = *ptep; - if (pte_write(pte)) { - if (mm_has_pgste(mm)) { - pgste = pgste_get_lock(ptep); - pgste = pgste_ipte_notify(mm, address, ptep, pgste); - } - - ptep_flush_lazy(mm, address, ptep); - pte = pte_wrprotect(pte); - - if (mm_has_pgste(mm)) { - pgste = pgste_set_pte(ptep, pgste, pte); - pgste_set_unlock(ptep, pgste); - } else - *ptep = pte; - } - return pte; + if (pte_write(pte)) + ptep_xchg_lazy(mm, addr, ptep, pte_wrprotect(pte)); } #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS static inline int ptep_set_access_flags(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep, + unsigned long addr, pte_t *ptep, pte_t entry, int dirty) { - pgste_t pgste; - pte_t oldpte; - - oldpte = *ptep; - if (pte_same(oldpte, entry)) + if (pte_same(*ptep, entry)) return 0; - if (mm_has_pgste(vma->vm_mm)) { - pgste = pgste_get_lock(ptep); - pgste = pgste_ipte_notify(vma->vm_mm, address, ptep, pgste); - } + ptep_xchg_direct(vma->vm_mm, addr, ptep, entry); + return 1; +} - ptep_flush_direct(vma->vm_mm, address, ptep); +void set_pte_pgste_at(struct mm_struct *, unsigned long, pte_t *, pte_t); - if (mm_has_pgste(vma->vm_mm)) { - if (pte_val(oldpte) & _PAGE_INVALID) - pgste_set_key(ptep, pgste, entry, vma->vm_mm); - pgste = pgste_set_pte(ptep, pgste, entry); - pgste_set_unlock(ptep, pgste); - } else +/* + * Certain architectures need to do special things when PTEs + * within a page table are directly modified. Thus, the following + * hook is made available. + */ +static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t entry) +{ + if (mm_has_pgste(mm)) + set_pte_pgste_at(mm, addr, ptep, entry); + else *ptep = entry; - return 1; } /* diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 4af21c771f9b..616e0a16ee88 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -280,7 +280,7 @@ static void kvm_s390_sync_dirty_log(struct kvm *kvm, for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) { address = gfn_to_hva_memslot(memslot, cur_gfn); - if (gmap_test_and_clear_dirty(address, gmap)) + if (pgste_test_and_clear_dirty(gmap->mm, address)) mark_page_dirty(kvm, cur_gfn); } up_read(&gmap->mm->mmap_sem); diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 6acd7174fe75..30033aad17da 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -772,7 +772,7 @@ int gmap_ipte_notify(struct gmap *gmap, unsigned long gaddr, unsigned long len) EXPORT_SYMBOL_GPL(gmap_ipte_notify); /** - * gmap_do_ipte_notify - call all invalidation callbacks for a specific pte. + * ptep_ipte_notify - call all invalidation callbacks for a specific pte. * @mm: pointer to the process mm_struct * @addr: virtual address in the process address space * @pte: pointer to the page table entry @@ -780,7 +780,7 @@ EXPORT_SYMBOL_GPL(gmap_ipte_notify); * This function is assumed to be called with the page table lock held * for the pte to notify. */ -void gmap_do_ipte_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte) +void ptep_ipte_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte) { unsigned long offset, gaddr; unsigned long *table; @@ -801,7 +801,7 @@ void gmap_do_ipte_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte) } spin_unlock(&gmap_notifier_lock); } -EXPORT_SYMBOL_GPL(gmap_do_ipte_notify); +EXPORT_SYMBOL_GPL(ptep_ipte_notify); int set_guest_storage_key(struct mm_struct *mm, unsigned long addr, unsigned long key, bool nq) @@ -1158,6 +1158,266 @@ static inline void thp_split_mm(struct mm_struct *mm) } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +static inline pte_t ptep_flush_direct(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + int active, count; + pte_t old; + + old = *ptep; + if (unlikely(pte_val(old) & _PAGE_INVALID)) + return old; + active = (mm == current->active_mm) ? 1 : 0; + count = atomic_add_return(0x10000, &mm->context.attach_count); + if (MACHINE_HAS_TLB_LC && (count & 0xffff) <= active && + cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) + __ptep_ipte_local(addr, ptep); + else + __ptep_ipte(addr, ptep); + atomic_sub(0x10000, &mm->context.attach_count); + return old; +} + +static inline pte_t ptep_flush_lazy(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + int active, count; + pte_t old; + + old = *ptep; + if (unlikely(pte_val(old) & _PAGE_INVALID)) + return old; + active = (mm == current->active_mm) ? 1 : 0; + count = atomic_add_return(0x10000, &mm->context.attach_count); + if ((count & 0xffff) <= active) { + pte_val(*ptep) |= _PAGE_INVALID; + mm->context.flush_mm = 1; + } else + __ptep_ipte(addr, ptep); + atomic_sub(0x10000, &mm->context.attach_count); + return old; +} + +static inline pgste_t pgste_update_all(pte_t pte, pgste_t pgste, + struct mm_struct *mm) +{ +#ifdef CONFIG_PGSTE + unsigned long address, bits, skey; + + if (!mm_use_skey(mm) || pte_val(pte) & _PAGE_INVALID) + return pgste; + address = pte_val(pte) & PAGE_MASK; + skey = (unsigned long) page_get_storage_key(address); + bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED); + /* 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 */ + pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT); + pgste_val(pgste) |= (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56; +#endif + return pgste; + +} + +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 (!mm_use_skey(mm) || pte_val(entry) & _PAGE_INVALID) + return; + VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID)); + address = pte_val(entry) & PAGE_MASK; + /* + * Set page access key and fetch protection bit from pgste. + * The guest C/R information is still in the PGSTE, set real + * 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 pgste_t pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry) +{ +#ifdef CONFIG_PGSTE + 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; + } +#endif + *ptep = entry; + return pgste; +} + +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) & PGSTE_IN_BIT) { + pgste_val(pgste) &= ~PGSTE_IN_BIT; + ptep_ipte_notify(mm, addr, ptep); + } +#endif + return pgste; +} + +#ifdef CONFIG_PGSTE +/* + * Test and reset if a guest page is dirty + */ +bool pgste_test_and_clear_dirty(struct mm_struct *mm, unsigned long addr) +{ + spinlock_t *ptl; + pgste_t pgste; + pte_t *ptep; + pte_t pte; + bool dirty; + + ptep = get_locked_pte(mm, addr, &ptl); + if (unlikely(!ptep)) + return false; + + 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, addr, 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); + + spin_unlock(ptl); + return dirty; +} +EXPORT_SYMBOL_GPL(pgste_test_and_clear_dirty); + +void set_pte_pgste_at(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t entry) +{ + pgste_t pgste; + + /* the mm_has_pgste() check is done in set_pte_at() */ + pgste = pgste_get_lock(ptep); + pgste_val(pgste) &= ~_PGSTE_GPS_ZERO; + pgste_set_key(ptep, pgste, entry, mm); + pgste = pgste_set_pte(ptep, pgste, entry); + pgste_set_unlock(ptep, pgste); +} +EXPORT_SYMBOL(set_pte_pgste_at); +#endif + +static inline pgste_t ptep_xchg_start(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + pgste_t pgste = __pgste(0); + + if (mm_has_pgste(mm)) { + pgste = pgste_get_lock(ptep); + pgste = pgste_ipte_notify(mm, addr, ptep, pgste); + } + return pgste; +} + +static inline void ptep_xchg_commit(struct mm_struct *mm, + unsigned long addr, pte_t *ptep, + pgste_t pgste, pte_t old, pte_t new) +{ + if (mm_has_pgste(mm)) { + if (pte_val(old) & _PAGE_INVALID) + pgste_set_key(ptep, pgste, new, mm); + if (pte_val(new) & _PAGE_INVALID) { + pgste = pgste_update_all(old, pgste, mm); + if ((pgste_val(pgste) & _PGSTE_GPS_USAGE_MASK) == + _PGSTE_GPS_USAGE_UNUSED) + pte_val(old) |= _PAGE_UNUSED; + } + pgste = pgste_set_pte(ptep, pgste, new); + pgste_set_unlock(ptep, pgste); + } else { + *ptep = new; + } +} + +pte_t ptep_xchg_direct(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t new) +{ + pgste_t pgste; + pte_t old; + + pgste = ptep_xchg_start(mm, addr, ptep); + old = ptep_flush_direct(mm, addr, ptep); + ptep_xchg_commit(mm, addr, ptep, pgste, old, new); + return old; +} +EXPORT_SYMBOL(ptep_xchg_direct); + +pte_t ptep_xchg_lazy(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t new) +{ + pgste_t pgste; + pte_t old; + + pgste = ptep_xchg_start(mm, addr, ptep); + old = ptep_flush_lazy(mm, addr, ptep); + ptep_xchg_commit(mm, addr, ptep, pgste, old, new); + return old; +} +EXPORT_SYMBOL(ptep_xchg_lazy); + +pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr, + pte_t *ptep) +{ + pgste_t pgste; + pte_t old; + + pgste = ptep_xchg_start(mm, addr, ptep); + old = ptep_flush_lazy(mm, addr, ptep); + if (mm_has_pgste(mm)) { + pgste = pgste_update_all(old, pgste, mm); + pgste_set(ptep, pgste); + } + return old; +} +EXPORT_SYMBOL(ptep_modify_prot_start); + +void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pte) +{ + pgste_t pgste; + + if (mm_has_pgste(mm)) { + pgste = pgste_get(ptep); + pgste_set_key(ptep, pgste, pte, mm); + pgste = pgste_set_pte(ptep, pgste, pte); + pgste_set_unlock(ptep, pgste); + } else { + *ptep = pte; + } +} +EXPORT_SYMBOL(ptep_modify_prot_commit); + /* * switch on pgstes for its userspace process (for kvm) */ @@ -1190,17 +1450,15 @@ static int __s390_enable_skey(pte_t *pte, unsigned long addr, unsigned long ptev; pgste_t pgste; - pgste = pgste_get_lock(pte); /* * Remove all zero page mappings, * after establishing a policy to forbid zero page mappings * following faults for that page will get fresh anonymous pages */ - if (is_zero_pfn(pte_pfn(*pte))) { - ptep_flush_direct(walk->mm, addr, pte); - pte_val(*pte) = _PAGE_INVALID; - } + if (is_zero_pfn(pte_pfn(*pte))) + ptep_xchg_direct(walk->mm, addr, pte, __pte(_PAGE_INVALID)); /* Clear storage key */ + pgste = pgste_get_lock(pte); pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT | PGSTE_GR_BIT | PGSTE_GC_BIT); ptev = pte_val(*pte); @@ -1266,27 +1524,6 @@ void s390_reset_cmma(struct mm_struct *mm) } EXPORT_SYMBOL_GPL(s390_reset_cmma); -/* - * Test and reset if a guest page is dirty - */ -bool gmap_test_and_clear_dirty(unsigned long address, struct gmap *gmap) -{ - pte_t *pte; - spinlock_t *ptl; - bool dirty = false; - - pte = get_locked_pte(gmap->mm, address, &ptl); - if (unlikely(!pte)) - return false; - - if (ptep_test_and_clear_user_dirty(gmap->mm, address, pte)) - dirty = true; - - spin_unlock(ptl); - return dirty; -} -EXPORT_SYMBOL_GPL(gmap_test_and_clear_dirty); - #ifdef CONFIG_TRANSPARENT_HUGEPAGE int pmdp_clear_flush_young(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) |