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| author |   Dominik Dingel <dingel@linux.vnet.ibm.com> | 2014-01-14 18:10:17 +0100 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@de.ibm.com> | 2014-04-22 09:36:25 +0200 |
| commit | 934bc131efc3e4be6a52f7dd6c4dbf99635e381a (patch) | |
| tree | 67b5df8e42e7db5f1f59f7d851b97923b5336678 /arch/s390/include | |
| parent | KVM: s390: Clear storage keys (diff) | |
| download | linux-dev-934bc131efc3e4be6a52f7dd6c4dbf99635e381a.tar.xz linux-dev-934bc131efc3e4be6a52f7dd6c4dbf99635e381a.zip | |
KVM: s390: Allow skeys to be enabled for the current process
Introduce a new function s390_enable_skey(), which enables storage key
handling via setting the use_skey flag in the mmu context.
This function is only useful within the context of kvm.
Note that enabling storage keys will cause a one-time hickup when
walking the page table; however, it saves us special effort for cases
like clear reset while making it possible for us to be architecture
conform.
s390_enable_skey() takes the page table lock to prevent reseting
storage keys triggered from multiple vcpus.
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>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index e88e9f6b07cc..51b002b5667e 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1747,6 +1747,7 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) extern int vmem_add_mapping(unsigned long start, unsigned long size); extern int vmem_remove_mapping(unsigned long start, unsigned long size); extern int s390_enable_sie(void); +extern void s390_enable_skey(void); /* * No page table caches to initialise |