D35414.diff
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	diff --git a/sys/dev/iommu/iommu_gas.c b/sys/dev/iommu/iommu_gas.c
	--- a/sys/dev/iommu/iommu_gas.c
	+++ b/sys/dev/iommu/iommu_gas.c
	@@ -384,7 +384,12 @@
	iommu_gas_match_insert(a);
	return (0);
	}
	- if (entry->free_down < a->size + a->offset + IOMMU_PAGE_SIZE)
	+
	+ /*
	+ * If the subtree doesn't have free space for the requested allocation
	+ * plus two guard pages, give up.
	+ */
	+ if (entry->free_down < a->size + a->offset + 2 * IOMMU_PAGE_SIZE)
	return (ENOMEM);
	if (entry->first >= a->common->lowaddr)
	return (ENOMEM);
	@@ -408,7 +413,11 @@
	{
	struct iommu_map_entry *child;

	- if (entry->free_down < a->size + a->offset + IOMMU_PAGE_SIZE)
	+ /*
	+ * If the subtree doesn't have free space for the requested allocation
	+ * plus two guard pages, give up.
	+ */
	+ if (entry->free_down < a->size + a->offset + 2 * IOMMU_PAGE_SIZE)
	return (ENOMEM);
	if (entry->last < a->common->highaddr)
	return (ENOMEM);