From dc4c0fdb8493d526b8a26a30edcb14d996b7574d Mon Sep 17 00:00:00 2001
From: Izik Eidus <ieidus@redhat.com>
Date: Mon, 20 Jul 2009 19:39:22 -0300
Subject: [PATCH 1/2] KVM: Fix dirty bit tracking for slots with large pages

When slot is already allocated and being asked to be tracked we need
to break the large pages.

This code flush the mmu when someone ask a slot to start dirty bit
tracking.

Cc: stable@kernel.org
Signed-off-by: Izik Eidus <ieidus@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
(cherry picked from commit e244584fe3a5c20deddeca246548ac86dbc6e1d1)
Bugzilla: 512712
Message-ID: <20090720223922.GA12624@amt.cnet>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
RH-Upstream-status: backported-from-upstream
Acked-by: Izik Eidus <ieidus@redhat.com>
Acked-by: Juan Quintela <quintela@redhat.com>
Acked-by: john cooper <john.cooper@redhat.com>
---
 virt/kvm/kvm_main.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 80fe706..57bd9ce 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1183,6 +1183,8 @@ int __kvm_set_memory_region(struct kvm *kvm,
 		if (!new.dirty_bitmap)
 			goto out_free;
 		memset(new.dirty_bitmap, 0, dirty_bytes);
+		if (old.npages)
+			kvm_arch_flush_shadow(kvm);
 	}
 #endif /* not defined CONFIG_S390 */
 
-- 
1.6.3.rc4.29.g8146