vfio_find_dma
dma = vfio_find_dma(iommu, iova, PAGE_SIZE);
dma = vfio_find_dma(iommu, iova, PAGE_SIZE);
dma = vfio_find_dma(iommu, iova, 1);
dma = vfio_find_dma(iommu, iova_end, 1);
dma = vfio_find_dma(iommu, iova, 1);
dma = vfio_find_dma(iommu, iova_end, 1);
dma = vfio_find_dma(iommu, iova, size);
if (vfio_find_dma(iommu, first->start, start - first->start))
if (vfio_find_dma(iommu, end + 1, last->end - end))
if (vfio_find_dma(iommu, region->start, region->length))
dma = vfio_find_dma(iommu, user_iova, 1);
dma = vfio_find_dma(iommu, iova, PAGE_SIZE);