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Diffstat (limited to 'arch/s390/include/asm/mmu_context.h')
-rw-r--r--arch/s390/include/asm/mmu_context.h28
1 files changed, 22 insertions, 6 deletions
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index d321469eeda7..c837b79b455d 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -26,12 +26,28 @@ static inline int init_new_context(struct task_struct *tsk,
mm->context.has_pgste = 0;
mm->context.use_skey = 0;
#endif
- if (mm->context.asce_limit == 0) {
+ switch (mm->context.asce_limit) {
+ case 1UL << 42:
+ /*
+ * forked 3-level task, fall through to set new asce with new
+ * mm->pgd
+ */
+ case 0:
/* context created by exec, set asce limit to 4TB */
- mm->context.asce_bits = _ASCE_TABLE_LENGTH |
- _ASCE_USER_BITS | _ASCE_TYPE_REGION3;
mm->context.asce_limit = STACK_TOP_MAX;
- } else if (mm->context.asce_limit == (1UL << 31)) {
+ mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
+ _ASCE_USER_BITS | _ASCE_TYPE_REGION3;
+ break;
+ case 1UL << 53:
+ /* forked 4-level task, set new asce with new mm->pgd */
+ mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
+ _ASCE_USER_BITS | _ASCE_TYPE_REGION2;
+ break;
+ case 1UL << 31:
+ /* forked 2-level compat task, set new asce with new mm->pgd */
+ mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
+ _ASCE_USER_BITS | _ASCE_TYPE_SEGMENT;
+ /* pgd_alloc() did not increase mm->nr_pmds */
mm_inc_nr_pmds(mm);
}
crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
@@ -42,7 +58,7 @@ static inline int init_new_context(struct task_struct *tsk,
static inline void set_user_asce(struct mm_struct *mm)
{
- S390_lowcore.user_asce = mm->context.asce_bits | __pa(mm->pgd);
+ S390_lowcore.user_asce = mm->context.asce;
if (current->thread.mm_segment.ar4)
__ctl_load(S390_lowcore.user_asce, 7, 7);
set_cpu_flag(CIF_ASCE);
@@ -71,7 +87,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
{
int cpu = smp_processor_id();
- S390_lowcore.user_asce = next->context.asce_bits | __pa(next->pgd);
+ S390_lowcore.user_asce = next->context.asce;
if (prev == next)
return;
if (MACHINE_HAS_TLB_LC)