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intel_iommu: Fix address space unmap 

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>
Message-Id: <20230615032626.314476-4-zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhenzhong Duan 2023-06-15 11:26:26 +08:00 committed by Michael S. Tsirkin
parent ce735ff033
commit ebe1504e10
1 changed files with 1 additions and 1 deletions
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2
hw/i386/intel_iommu.c
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@ -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);
}