[    0.000000] DMAR: IOMMU enabled
...
[    1.165288] vboxpci: IOMMU found

00:02.0 Display controller [0380]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06)
    Subsystem: ASUSTeK Computer Inc. Device [1043:8534]
    Kernel driver in use: vfio-pci
    Kernel modules: i915

VBoxManage modifyvm "Windows 10" --pciattach 00:02.0

[   80.632320] vboxpci: created IOMMU domain ffff8816e45e9fe8
[  159.674621] vboxpci: freeing IOMMU domain ffff8816e45e9fe8