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.. _release_notes_2.3:
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ACRN V2.3 (Dec 2020)
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####################
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We are pleased to announce the release of the Project ACRN
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hypervisor version 2.3.
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ACRN is a flexible, lightweight reference hypervisor that is built with
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real-time and safety-criticality in mind. It is optimized to streamline
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embedded development through an open source platform. Check out the
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:ref:`introduction` introduction for more information. All project ACRN
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source code is maintained in the
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https://github.com/projectacrn/acrn-hypervisor repository and includes
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folders for the ACRN hypervisor, the ACRN device model, tools, and
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documentation. You can either download this source code as a zip or
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tar.gz file (see the `ACRN v2.3 GitHub release page
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<https://github.com/projectacrn/acrn-hypervisor/releases/tag/v2.3>`_) or
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use Git clone and checkout commands::
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git clone https://github.com/projectacrn/acrn-hypervisor
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cd acrn-hypervisor
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git checkout v2.3
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The project's online technical documentation is also tagged to
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correspond with a specific release: generated v2.3 documents can be
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found at https://projectacrn.github.io/2.3/. Documentation for the
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latest under-development branch is found at
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https://projectacrn.github.io/latest/.
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ACRN v2.3 requires Ubuntu 18.04. Follow the instructions in the
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:ref:`rt_industry_ubuntu_setup` to get started with ACRN.
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What's New in V2.3
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******************
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Enhanced GPU passthrough (GVT-d)
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GPU passthrough (GVT-d) to Windows as a guest is now enabled for 11th Gen
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Intel® Core™ processors (codenamed Tiger Lake-UP3).
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Shared memory based inter-VM communication (ivshmem) is extended
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ivshmem now supports interrupts (See :ref:`ivshmem-hld`).
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Enhanced vUART support
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Added PCI vUART (up to 8) for VM-to-VM communication. Legacy vUART
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(0x3F8-like) is available for console (debugging) support.
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End-to-end secure boot improvement
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OVMF can be loaded now as two blobs, one for code and the other for data.
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The code blob can be verified by the Service VM's ``dm-verity`` as
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a step in the end-to-end secure boot.
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Enhanced system shutdown
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The pre-launched VM may now initiate a system shutdown or reset.
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Removed deprivileged boot mode support
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ACRN has supported deprivileged boot mode to ease the integration of
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Linux distributions such as Clear Linux. Unfortunately, deprivileged boot
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mode limits ACRN's scalability and is unsuitable for ACRN's hybrid
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hypervisor mode. In ACRN v2.2, deprivileged boot mode was no longer the default
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and completely removed in ACRN v2.3. We're focusing instead
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on using the simpler and more scalable multiboot2 boot (via Grub).
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Multiboot2 is not supported in
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Clear Linux so we have chosen Ubuntu (and Yocto Project) as the
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preferred Service VM OSs moving forward.
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Document Updates
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****************
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New and updated reference documents are available, including:
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.. rst-class:: rst-columns2
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* :ref:`asa`
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* :ref:`GVT-g-porting`
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* :ref:`vbsk-overhead`
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* :ref:`asm_coding_guidelines`
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* :ref:`c_coding_guidelines`
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* :ref:`contribute_guidelines`
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* :ref:`doc_guidelines`
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* :ref:`hld-devicemodel`
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* :ref:`hld-overview`
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* :ref:`hld-power-management`
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* :ref:`hld-security`
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* :ref:`hld-trace-log`
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* :ref:`hld-virtio-devices`
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* :ref:`ivshmem-hld`
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* :ref:`l1tf`
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* :ref:`modularity`
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* :ref:`sw_design_guidelines`
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* :ref:`getting-started-building`
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* :ref:`rt_industry_ubuntu_setup`
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* :ref:`introduction`
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* :ref:`release_notes_2.3`
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* :ref:`how-to-enable-acrn-secure-boot-with-grub`
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* :ref:`acrn_configuration_tool`
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* :ref:`acrn_on_qemu`
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* :ref:`acrn-debug`
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* :ref:`acrn_doc`
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* :ref:`enable_ivshmem`
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* :ref:`enable-s5`
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* :ref:`rdt_configuration`
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* :ref:`rt_performance_tuning`
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* :ref:`rt_perf_tips_rtvm`
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* :ref:`run-kata-containers`
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* :ref:`running_deb_as_serv_vm`
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* :ref:`running_deb_as_user_vm`
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* :ref:`running_ubun_as_user_vm`
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* :ref:`setup_openstack_libvirt`
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* :ref:`sgx_virt`
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* :ref:`sriov_virtualization`
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* :ref:`using_grub`
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* :ref:`using_hybrid_mode_on_nuc`
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* :ref:`using_partition_mode_on_nuc`
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* :ref:`using_windows_as_uos`
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* :ref:`using_zephyr_as_uos`
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* :ref:`vuart_config`
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* :ref:`how-to-enable-secure-boot-for-windows`
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* :ref:`acrn-dm_parameters`
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Because we're dropped deprivileged boot mode support, we're also
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switching our Service VM of choice away from Clear Linux and have
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removed Clear Linux-specific tutorials. Deleted documents are still
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available in the `version-specific v2.1 documentation
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<https://projectacrn.github.io/v2.1/>`_.
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Fixed Issues Details
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********************
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- :acrn-issue:`4958` - clean up spin lock for hypervisor
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- :acrn-issue:`5316` - add default BAR GPA for vmsi over msi
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- :acrn-issue:`5346` - Hide PCI bridge 00:1c.0 from SOS
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- :acrn-issue:`5411` - Supporting power off for pre-launched VMs
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- :acrn-issue:`5461` - DM: gvt: Identical mapping for GPU DSM
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- :acrn-issue:`5463` - WaaG hang in boot loading screen in cold boot test.
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- :acrn-issue:`5482` - acrn-config: insert vbdf in hex format and vuart vbdf logic
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- :acrn-issue:`5490` - Unhandled Exception happened in HV console when shutdown YaaG with shm device enabled
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- :acrn-issue:`5491` - TGL can't setup 6 pci-vuarts
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- :acrn-issue:`5498` - Hide IO 0x3f8 for SOS
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- :acrn-issue:`5501` - [WHL][Yocto][Hybrid] in hybrid mode ACRN HV env, can not shutdown pre-launched RTVM
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- :acrn-issue:`5506` - [EHL][SBL][hybrid_rt] in hybrid_rt, TPM can not work in pre-launched RTVM
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- :acrn-issue:`5508` - hv-bugfix-for-hv-emulated-device-de-init_v2.3
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- :acrn-issue:`5514` - Coding style issue for xhci.c
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Known Issues
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************
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- :acrn-issue:`5151` - [WHL][VxWorks] Launch VxWorks fails due to no suitable video mode found
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- :acrn-issue:`5369` - [TGL][qemu] Cannot launch qemu on TGL
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- :acrn-issue:`5572` - [WHL][Hybrid_rt] build hybrid_rt hv from source, boot RTVM fail
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- :acrn-issue:`5573` - [EHL][logical_partition] build EHL logical_partition hv from source Fail
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