IOMMU First-Level Translation Support in Intel CPUs

[yussuf_khalil]

We plan to make use of the First-Level Translation Support (FLTS) feature that Intel mentions in the VT-d specification [1]. However, it is unclear which CPU generations precisely support that functionality. We have tested with Cascade Lake and Ice Lake-SP processors, however, neither exposes the required bits in the IOMMU's "Extended Capability Register". Contrary to that, a blog post [2] seems to indicate that Intel has already introduced this feature in their processors. Can Intel clarify on which processor generations specifically support FLTS? Is this feature going to be introduced with Sapphire Rapids? If there are currently available CPUs supporting FLTS, which are these and does the feature require specific firmware support? Thank you.

[1] https://software.intel.com/sites/default/files/managed/c5/15/vt-directed-io-spec.pdf

[2] https://01.org/blogs/ashokraj/2018/recent-enhancements-intel-virtualization-technology-directed-i/o-intel-vt-d

[Jean_Intel]

Hello yussuf_khalil,

Thank you for posting on the Intel️® communities.  

I will proceed to check the issue internally and post back soon with more details. 

Best regards, 

Jean O.  

Intel Customer Support Technician

[Jean_Intel]

Hello yussuf_khalil,

Thank you for posting on the Intel️® communities.

Please, create an account to submit your inquiry in our Intel Developer Zone, as the document you refer to comes from this website. So, you receive further troubleshooting support and get access to documentation.  

Intel Developer Zone - Contact Page  

https://software.intel.com/en-us/support

Also, if you want information about outcoming products, you should take a look at our Newsroom website:

https://www.intel.com/content/www/us/en/newsroom/home.html

Best regards,

Jean O.  

Intel Customer Support Technician