> +static int vfio_pci_dma_fault_init(struct vfio_pci_device *vdev) > +{ > + struct vfio_region_dma_fault *header; > + struct iommu_domain *domain; > + size_t size; > + bool nested; > + int ret; > + > + domain = iommu_get_domain_for_dev(&vdev->pdev->dev); > + ret = iommu_domain_get_attr(domain, DOMAIN_ATTR_NESTING, &nested); > + if (ret || !nested) > + return ret; Hi Eric, It seems that the type of nested should be int, the use of bool might trigger a panic in arm_smmu_domain_get_attr(). Thanks, Shenming