From: Christian Borntraeger Date: Tue, 4 Jun 2013 07:53:59 +0000 (+0200) Subject: s390/pgtable: Fix guest overindication for change bit X-Git-Tag: v3.10-rc6~14^2~5 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=338679f7ba4a81906b3fdfa6507824fdf704be80;p=pandora-kernel.git s390/pgtable: Fix guest overindication for change bit When doing the transition invalid->valid in the host page table for a guest, then the guest view of C/R is in the pgste. After validation the view is pgste OR real key. We must zero out the real key C/R to avoid guest over-indication for change (and reference). Touching the real key is ok also for the host: The change bit is tracked via write protection and the reference bit is also ok because set_pte_at was called and the page will be touched anyway soon. Furthermore architecture defines reference as "substantially accurate", over- and underindication are ok. Signed-off-by: Christian Borntraeger Signed-off-by: Martin Schwidefsky --- Reading git-diff-tree failed