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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-05-16 10:34:11 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-05-16 14:57:17 +0200 |
| commit | 3a801517ad49f586f2016e1b1321e6cd28a97a04 (patch) | |
| tree | b1d3a84ccbeb491202dd2b402463a0d9e454408f /arch/x86 | |
| parent | d9f89b88f5102ce235b75a5907838e3c7ed84b97 (diff) | |
KVM: s390: correct locking for s390_enable_skey
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>
Diffstat (limited to 'arch/x86')
0 files changed, 0 insertions, 0 deletions