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Datasheet, Volume 1 41
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)