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Datasheet, Volume 1 43

Technologies

3.1.4 Intel

Virtualization Technology (Intel

VT) for Directed

I/O (Intel

VT-d) Features

The processor supports the following Intel VT-d features:

• Memory controller and processor graphics comply with Intel

VT-d 1.2 specification

• Two VT-d DMA remap engines:

— iGFX DMA remap engine

— DMI / PEG

• Support for root entry, context entry, and default context

• 39-bit guest physical address and host physical address widths

• Support for 4K page sizes only

• Support for register-based fault recording only (for single entry only) and support

for MSI interrupts for faults

• Support for both leaf and non-leaf caching

• Support for boot protection of default page table

• Support for non-caching of invalid page table entries

• Support for hardware based flushing of translated but pending writes and pending

reads, on IOTLB invalidation

• Support for page-selective IOTLB invalidation

• MSI cycles (MemWr to address FEEx_xxxxh) not translated

— Translation faults result in cycle forwarding to VBIOS region (byte enables

masked for writes). Returned data may be bogus for internal agents, PEG / DMI

interfaces return unsupported request status.

• Interrupt Remapping is supported

• Queued invalidation is supported

• VT-d translation bypass address range is supported (Pass Through)

Note: Intel VT-d Technology may not be available on all SKUs.

3.1.5 Intel

Virtualization Technology (Intel

VT) for Directed

I/O (Intel

VT-d) Features Not Supported

The following features are not supported by the processor with Intel VT-d:

• No support for PCIe* endpoint caching (ATS)

• No support for Intel VT-d read prefetching / snarfing (that is, translations within a

cacheline are not stored in an internal buffer for reuse for subsequent translations)

• No support for advance fault reporting

• No support for super pages

• No support for Intel VT-d translation bypass address range (such usage models

need to be resolved with VMM help in setting up the page tables correctly)

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