[Announce] ACRN Open Source Ver2.3 Release Notes

Zou, Terry

Hi all,


We are very pleased to announce Version 2.3 release of ACRN. You can see the release blog from https://projectacrn.org/blog/ and detailed Release Notes in website https://projectacrn.github.io/latest/release_notes/release_notes_2.3.html

What’s New in v2.3

·       Enhanced GPU passthru (GVT-d):

GPU passthru (GVT-d) to Windows as a guest is now enabled for 11th Gen Intel® Core™ processors (codenamed Tiger Lake-UP3).

·       Shared memory based inter-VM communication (ivshmem) is extended:

ivshmem now supports interrupts (See ACRN Shared Memory Based Inter-VM Communication)

·       Enhanced vUART support:

Added PCI vUART (up to 8) for VM-to-VM communication. Legacy vUART (0x3F8-like) is available for console (debugging) support.

·       End-to-end secure boot improvement

OVMF can be loaded now as two blobs, one for code and the other for data. The code blob can be verified by the Service VM’s dm-verity as a step in the end-to-end secure boot.

·       Enhanced system shutdown:

The pre-launched VM may now initiate a system shutdown or reset.

·       Removed deprivileged boot mode support:

ACRN has supported deprivileged boot mode to ease the integration of Linux distributions such as Clear Linux. Unfortunately, deprivileged boot mode limits ACRN’s scalability and is unsuitable for ACRN’s hybrid hypervisor mode. In ACRN v2.2, deprivileged boot mode was no longer the default and completely removed in ACRN v2.3. We’re focusing instead on using the simpler and more scalable multiboot2 boot (via Grub). Multiboot2 is not supported in Clear Linux so we have chosen Ubuntu (and Yocto Project) as the preferred Service VM OSs moving forward.


See the v2.3 full release notes and documentation for more information about this release including fixed and known issues.

Improvements, updates, and corrections have been made throughout our documentation as well, including these documents:


Because we’re dropped deprivileged boot mode support, we’re also switching our Service VM of choice away from Clear Linux and have removed Clear Linux-specific tutorials. Deleted documents are still available in the version-specific v2.1 documentation.


ACRN is a flexible, lightweight reference hypervisor that is built with real-time and safety-criticality in mind. It is optimized to streamline embedded development through an open source platform. Check out What is ACRN introduction for more information. All project ACRN source code is maintained in the https://github.com/projectacrn/acrn-hypervisor repository and includes folders for the ACRN hypervisor, the ACRN device model, tools, and documentation. You can either download this source code as a zip or tar.gz file (see the ACRN v2.3 GitHub release page) or use Git clone and checkout commands:


git clone https://github.com/projectacrn/acrn-hypervisor
cd acrn-hypervisor
git checkout v2.3


The project’s online technical documentation is also tagged to correspond with a specific release: generated v2.3 documents can be found at https://projectacrn.github.io/2.3/. Documentation for the latest under-development branch is found at https://projectacrn.github.io/latest/.


ACRN v2.3 requires Ubuntu 18.04. Follow the instructions in the Getting Started Guide for ACRN Industry Scenario with Ubuntu Service VM to get started with ACRN. We recommend that all developers upgrade to ACRN release v2.3.


Best & Regards