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>
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index f77695a..a5e6562 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -16,6 +16,8 @@
unsigned long vdso_base;
/* The mmu context has extended page tables. */
unsigned int has_pgste:1;
+ /* The mmu context uses storage keys. */
+ unsigned int use_skey:1;
} mm_context_t;
#define INIT_MM_CONTEXT(name) \