On: OS X-KVM: Running Mac OS X El Capitan on KVM and QEMU

[virtuallynathan]

VT-d = Virtualization Technology for Directed I/O which basically means the CPU has an IOMMU, the IOMMU is a piece of hardware for doing PCIe DMA re-mapping to provide VM isolation. VFIO is the linux driver for passing through IOMMU devices.