Datasheet

Datasheet, Volume 1 41
Technologies
• 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
®
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)
3.2 Intel
®
Trusted Execution Technology (Intel
®
TXT)
Intel Trusted Execution Technology (Intel TXT) defines platform-level enhancements
that provide the building blocks for creating trusted platforms.
The Intel TXT platform helps to provide the authenticity of the controlling environment
such that those wishing to rely on the platform can make an appropriate trust decision.
The Intel TXT platform determines the identity of the controlling environment by
accurately measuring and verifying the controlling software.
Another aspect of the trust decision is the ability of the platform to resist attempts to
change the controlling environment. The Intel TXT platform will resist attempts by
software processes to change the controlling environment or bypass the bounds set by
the controlling environment.
Intel TXT is a set of extensions designed to provide a measured and controlled launch
of system software that will then establish a protected environment for itself and any
additional software that it may execute.