[PATCH v4 3/3] intel_iommu: Fix address space unmap

[Zhenzhong Duan]

During address space unmap, corresponding IOVA tree entries are
also removed. But DMAMap is set beyond notifier's scope by 1, so
in theory there is possibility to remove a continuous entry above
the notifier's scope but falling in adjacent notifier's scope.

There is no issue currently as no use cases allocate notifiers
continuously, but let's be robust.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
---
 hw/i386/intel_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index f046f8591335..dcc334060cd6 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3791,7 +3791,7 @@ static void vtd_address_space_unmap(VTDAddressSpace *as, 
IOMMUNotifier *n)
                              n->start, size);
 
     map.iova = n->start;
-    map.size = size;
+    map.size = size - 1; /* Inclusive */
     iova_tree_remove(as->iova_tree, map);
 }
 
-- 
2.34.1