[prymar56@h6 ~]$ sudo xl dmesg | grep -iP 'vt-d|i/o'
(XEN) Enabling APIC mode:  Phys.  Using 3 I/O APICs
(XEN) Intel VT-d iommu 0 supported page sizes: 4kB
(XEN) Intel VT-d iommu 1 supported page sizes: 4kB
(XEN) Intel VT-d Snoop Control enabled.
(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
(XEN) Intel VT-d Queued Invalidation enabled.
(XEN) Intel VT-d Interrupt Remapping enabled.
(XEN) Intel VT-d Posted Interrupt not enabled.
(XEN) Intel VT-d Shared EPT tables not enabled.
(XEN) I/O virtualisation enabled
(XEN) Masked VT-d error signaling on 0000:00:05.0
(XEN) Masked VT-d error signaling on 0000:40:05.0
(XEN) Masked VT-d error signaling on 0000:00:05.0
(XEN) Masked VT-d error signaling on 0000:40:05.0