Can you give this one-liner a spin?
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index c6622011d4938c..e889111b55c71d 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4007,6 +4007,7 @@ static const struct dma_map_ops bounce_dma_ops = {
.alloc_pages = dma_common_alloc_pages,
.free_pages = dma_common_free_pages,
.dma_supported = dma_direct_supported,
+ .max_mapping_size = swiotlb_max_mapping_size,
};
static inline int iommu_domain_cache_init(void)
