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KVM: s390: Adding skey bit to mmu context

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For lazy storage key handling, we need a mechanism to track if the
process ever issued a storage key operation.

This patch adds the basic infrastructure for making the storage
key handling optional, but still leaves it enabled for now by default.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Dominik Dingel
2014-01-14 15:02:11 +01:00
committed by Christian Borntraeger
parent 0f689a33ad
commit 65eef33550
3 changed files with 30 additions and 14 deletions
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arch/s390/include/asm/mmu_context.h
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@@ -23,6 +23,7 @@ static inline int init_new_context(struct task_struct *tsk,
mm->context.asce_bits |= _ASCE_TYPE_REGION3;
#endif
mm->context.has_pgste = 0;
mm->context.use_skey = 1;
mm->context.asce_limit = STACK_TOP_MAX;
crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
return 0;