From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Thu, 28 Aug 2014 19:21:41 +0000 (+0200)
Subject: KVM: s390/mm: Fix storage key corruption during swapping
X-Git-Tag: fixes-v3.17-rc4~13^2~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e03d4c46daa849880837d802e41c14132a03ef9;p=pandora-kernel.git

KVM: s390/mm: Fix storage key corruption during swapping

Since 3.12 or more precisely  commit 0944fe3f4a32 ("s390/mm:
implement software referenced bits") guest storage keys get
corrupted during paging. This commit added another valid->invalid
translation for page tables - namely ptep_test_and_clear_young.
We have to transfer the storage key into the pgste in that case.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: stable@vger.kernel.org # v3.12+
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