KVM: s390: Adding skey bit to mmu context
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>
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