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-rw-r--r--arch/s390/include/asm/mmu_context.h17
-rw-r--r--arch/s390/include/asm/tlb.h14
-rw-r--r--arch/s390/mm/pgtable.c8
3 files changed, 21 insertions, 18 deletions
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 38149b63dc44..7abf318b1522 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -35,7 +35,7 @@ static inline int init_new_context(struct task_struct *tsk,
#define LCTL_OPCODE "lctlg"
#endif
-static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
+static inline void update_user_asce(struct mm_struct *mm)
{
pgd_t *pgd = mm->pgd;
@@ -45,6 +45,13 @@ static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
set_fs(current->thread.mm_segment);
}
+static inline void clear_user_asce(struct mm_struct *mm)
+{
+ S390_lowcore.user_asce = S390_lowcore.kernel_asce;
+ asm volatile(LCTL_OPCODE" 1,1,%0\n" : : "m" (S390_lowcore.user_asce));
+ asm volatile(LCTL_OPCODE" 7,7,%0\n" : : "m" (S390_lowcore.user_asce));
+}
+
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
@@ -53,11 +60,13 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
if (prev == next)
return;
if (atomic_inc_return(&next->context.attach_count) >> 16) {
- /* Delay update_mm until all TLB flushes are done. */
+ /* Delay update_user_asce until all TLB flushes are done. */
set_tsk_thread_flag(tsk, TIF_TLB_WAIT);
+ /* Clear old ASCE by loading the kernel ASCE. */
+ clear_user_asce(next);
} else {
cpumask_set_cpu(cpu, mm_cpumask(next));
- update_mm(next, tsk);
+ update_user_asce(next);
if (next->context.flush_mm)
/* Flush pending TLBs */
__tlb_flush_mm(next);
@@ -80,7 +89,7 @@ static inline void finish_arch_post_lock_switch(void)
cpu_relax();
cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
- update_mm(mm, tsk);
+ update_user_asce(mm);
if (mm->context.flush_mm)
__tlb_flush_mm(mm);
preempt_enable();
diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index 2cb846c4b37f..c544b6f05d95 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -57,8 +57,6 @@ static inline void tlb_gather_mmu(struct mmu_gather *tlb,
tlb->end = end;
tlb->fullmm = !(start | (end+1));
tlb->batch = NULL;
- if (tlb->fullmm)
- __tlb_flush_mm(mm);
}
static inline void tlb_flush_mmu(struct mmu_gather *tlb)
@@ -96,9 +94,7 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
unsigned long address)
{
- if (!tlb->fullmm)
- return page_table_free_rcu(tlb, (unsigned long *) pte);
- page_table_free(tlb->mm, (unsigned long *) pte);
+ page_table_free_rcu(tlb, (unsigned long *) pte);
}
/*
@@ -114,9 +110,7 @@ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
#ifdef CONFIG_64BIT
if (tlb->mm->context.asce_limit <= (1UL << 31))
return;
- if (!tlb->fullmm)
- return tlb_remove_table(tlb, pmd);
- crst_table_free(tlb->mm, (unsigned long *) pmd);
+ tlb_remove_table(tlb, pmd);
#endif
}
@@ -133,9 +127,7 @@ static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
#ifdef CONFIG_64BIT
if (tlb->mm->context.asce_limit <= (1UL << 42))
return;
- if (!tlb->fullmm)
- return tlb_remove_table(tlb, pud);
- crst_table_free(tlb->mm, (unsigned long *) pud);
+ tlb_remove_table(tlb, pud);
#endif
}
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 796c9320c709..24c62900b532 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -54,7 +54,7 @@ static void __crst_table_upgrade(void *arg)
struct mm_struct *mm = arg;
if (current->active_mm == mm)
- update_mm(mm, current);
+ update_user_asce(mm);
__tlb_flush_local();
}
@@ -107,8 +107,10 @@ void crst_table_downgrade(struct mm_struct *mm, unsigned long limit)
{
pgd_t *pgd;
- if (current->active_mm == mm)
+ if (current->active_mm == mm) {
+ clear_user_asce(mm);
__tlb_flush_mm(mm);
+ }
while (mm->context.asce_limit > limit) {
pgd = mm->pgd;
switch (pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) {
@@ -132,7 +134,7 @@ void crst_table_downgrade(struct mm_struct *mm, unsigned long limit)
crst_table_free(mm, (unsigned long *) pgd);
}
if (current->active_mm == mm)
- update_mm(mm, current);
+ update_user_asce(mm);
}
#endif