VT-d is enabled.
This error occurs fairly early in the stage 2 boot process and I can't see any obvious error messages.
Possibly relevant messages:
(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
(XEN) Intel VT-d Dom0 Queued Invalidation enabled.
(XEN) Intel VT-d Dom0 Interupt Remapping enabled.
(XEN) Intel VT-d Dom0 Shared EPT tables not enabled.
(XEN) I/O virtualisation enabled
(XEN) - Dom0 mode : Relaxed
We then see IO-APIC IRQs enabled with old ACK method,
(XEN) Platform timer is 14.318 MHz HPET
(XEN) Allocated console ring of 16 KiB.
A list of VMX supported features, EPT supports 2MB super page,
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN (HVM) Hardware assisted paging detected.
At which point it just freezes.
Stephen.