Intel G870 BX80623G870 User Manual

Datasheet, Volume 1

37

• 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)

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

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

• No support for PCISIG 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)

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.