Linux Stack for Intel® TDX (Trust Domain Extensions)

1. Overview

1.1 Intel® Trust Domain Extensions(TDX)

Intel® Trust Domain Extensions(TDX) refers to an Intel technology that extends Virtual Machine Extensions(VMX) and Multi-Key Total Memory Encryption(MK-TME) with a new kind of virtual machine guest called a Trust Domain(TD). A TD runs in a CPU mode that protects the confidentiality of its memory contents and its CPU state from any other software, including the hosting Virtual Machine Monitor (VMM). Please get more details from TDX White Papers and Specifications

NOTE: tdx-tools keeps evolving along with kernel version. Please refer to corresponding tag for different kernel version support. Please make sure to use the corresponding tag aligned with kernel version.

1.2 Hardware Availability

• As of July 2023, Intel TDX is available through custom 4th Gen Intel Xeon Scalable processors (formerly code-named “Sapphire Rapids”) delivered to certain major Cloud Service Providers, including Alibaba, Azure, Google Cloud and IBM Cloud. Today, Alibaba and Azure are already in preview, with Google and IBM expected in the coming months.
• Intel’s Developer Cloud will be equipped with TDX-capable Intel Xeon Scalable processors in the coming months for software testing and solution development. Stay tuned to our GitHub for news on availability.
• Intel TDX will be generally available in the upcoming 5th Gen Intel Xeon Scalable processors (code-named “Emerald Rapids”).

NOTE:

• Please run check-tdx-host.sh to check your TDX bare metal host environment.
• Please run check-tdx-guest.sh to check your TDX guest VM environment.

1.3 API and Specifications

Please see details at here:

2. Linux Stack for Intel TDX

Linux Stack for Intel® TDX is an end-to-end hypervisor cloud stack including the Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) components.

2.1 Use Cases

It produce the following minimal use cases:

• Launch Intel® TDX guest VM to run general computing workloads
• Do launch-time measurement within the Intel® TDX guest VM
• Do runtime attestation with the quote generated by Intel® Software Guard Extensions (Intel® SGX)-based quote generation service (QGS) on the IaaS host
• vTPM stack for TD works with tpm2-tools, IMA and Keylime.

It provides the below tools for developer:

• Build individual component's package or install pre-build binaries on IaaS host or create PaaS guest image for quick evaluation
• Generate the patch set for deep dive in source code level
• Test, hack and debug the TDX technology based on PyCloudStack framework
• Dump guest VM measurement and generate TD quote report for TDX E2E attestation
• Measured boot and Secure boot for TDX guest VM
• Deployment tool for Linux TDX SW stack deployment on TDX enabled host
• Guest image tool to generate TD guest image

2.2 Components

Linux Stack for Intel® TDX includes the components in below diagram:

3. How to Use

Please refer the white paper: Linux*Stacks for Intel® Trust Domain Extension 1.0 (only cover TDX 1.0) and wiki for additional informational about TDX 1.5 or developer specific.