KVM: s390: correct locking for s390_enable_skey

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Use the mm semaphore to serialize multiple invocations of s390_enable_skey.
The second CPU faulting on a storage key operation needs to wait for the
completion of the page table update. Taking the mm semaphore writable
has the positive side-effect that it prevents any host faults from
taking place which does have implications on keys vs PGSTE.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

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Martin Schwidefsky 2014-05-16 10:34:11 +02:00 • committed by Christian Borntraeger

parent d9f89b88f5

commit 3a801517ad

1 changed files with 7 additions and 15 deletions

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arch/s390/mm/pgtable.c

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