KVM: s390: Allow skeys to be enabled for the current process

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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>

...

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Dominik Dingel 2014-01-14 18:10:17 +01:00 • committed by Christian Borntraeger

parent d4cb11340b

commit 934bc131ef

2 changed files with 24 additions and 0 deletions

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1

arch/s390/include/asm/pgtable.h

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23

arch/s390/mm/pgtable.c

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