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KVM: s390/mm: try a cow on read only pages for key ops
authorChristian Borntraeger <borntraeger@de.ibm.com>
Tue, 19 Aug 2014 14:19:35 +0000 (16:19 +0200)
committerChristian Borntraeger <borntraeger@de.ibm.com>
Mon, 25 Aug 2014 12:35:28 +0000 (14:35 +0200)
commitab3f285f227fec62868037e9b1b1fd18294a83b8
tree223d790283f4379ce84a87660d100a1f1933cffdtree
parent614a80e474b227cace52fd6e3c790554db8a396ecommit | diff
KVM: s390/mm: try a cow on read only pages for key ops

The PFMF instruction handler  blindly wrote the storage key even if
the page was mapped R/O in the host. Lets try a COW before continuing
and bail out in case of errors.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
arch/s390/mm/pgtable.c diff | blob | history
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