From: Florian Funke <ffunke@de.ibm.com>
Date: Fri, 10 Oct 2008 19:33:26 +0000 (+0200)
Subject: [S390] introduce dirty bit for kvm live migration
X-Git-Tag: v2.6.28-rc1~721^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15e86b0c752d50e910b2cca6e83ce74c4440d06c;p=pandora-kernel.git

[S390] introduce dirty bit for kvm live migration

This patch defines a dirty bit in the PGSTE that can be used to implement
dirty pages logging for KVM's live migration. The bit is set in the
ptep_rcp_copy function, which is called to save dirty and referenced information
from the storage key in the PGSTE. The bit can be tested and reset by KVM using
the kvm_s390_test_and_clear_page_dirty function that is introduced by this patch.

Acked-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Florian Funke <ffunke@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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