[patch 012/108] KVM: Fix dirty bit tracking for slots with large pages

[Greg KH]

2.6.30-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Izik Eidus <ieidus@xxxxxxxxxx>

commit e244584fe3a5c20deddeca246548ac86dbc6e1d1 upstream.

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.

Signed-off-by: Izik Eidus <ieidus@xxxxxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 virt/kvm/kvm_main.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1030,6 +1030,8 @@ int __kvm_set_memory_region(struct 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 */
 


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