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Enabling PTM requires some additional engineering work, so we're removing these instructions for now. Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
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3.9 KiB
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122 lines
3.9 KiB
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.. _release_notes_2.6:
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ACRN v2.6 (Sep 2021) - Draft
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############################
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We are pleased to announce the release of the Project ACRN hypervisor
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version 2.6.
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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. See the
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:ref:`introduction` introduction for more information.
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All project ACRN 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 download this source code either as a zip or
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tar.gz file (see the `ACRN v2.6 GitHub release page
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<https://github.com/projectacrn/acrn-hypervisor/releases/tag/v2.6>`_) 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 v2.6
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The project's online technical documentation is also tagged to
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correspond with a specific release: generated v2.6 documents can be
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found at https://projectacrn.github.io/2.6/. Documentation for the
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latest development branch is found at https://projectacrn.github.io/latest/.
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ACRN v2.6 requires Ubuntu 18.04. Follow the instructions in the
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:ref:`gsg` to get started with ACRN.
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What's New in v2.6
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******************
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Nested Virtualization Technology Performance Tuning
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The performance of nested virtualization, a feature first introduced as a
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preview in the v2.5 release, was improved. CPU and I/O performance of level 2
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virtual machines (for example, a VM running on a KVM/QEMU VM that itself is a
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VM on ACRN hypervisor) is now on par with a VM running on KVM on bare metal.
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Read more in the :ref:`nested_virt` tutorial.
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Support loading OSes in ELF format
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ACRN hypervisor now can load OS images packed in ELF (Executable and Linkable
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Format). This adds flexibility to OSs such as Zephyr running in pre-launched
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VMs.
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Upgrading to v2.6 From Previous Releases
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****************************************
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We highly recommended that you follow these instructions to
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upgrade to v2.6 from previous ACRN releases.
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Generate New Board XML
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======================
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Board XML files, generated by ACRN board inspector, contain board information
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that is essential to build ACRN. Compared to previous versions, ACRN v2.6 adds
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the following hardware information to board XMLs to support the new features and
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fixes.
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- Maximum width of physical and linear addresses
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- Device objects in the ACPI namespace
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- Routing of PCI interrupt pins
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- Number of requested vectors of MSI-capable PCI devices
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The new board XML can be generated using the ACRN board inspector in the same
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way as ACRN v2.5. Refer to :ref:`acrn_config_workflow` for a complete list of
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steps to deploy and run the tool.
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Add New Configuration Options
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=============================
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In v2.6, the following elements are added to scenario XML files.
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- :option:`hv.FEATURES.ENFORCE_TURNOFF_GP` (Default value is ``n``)
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- :option:`hv.FEATURES.SECURITY_VM_FIXUP` (Default value is ``n``)
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Document Updates
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****************
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We've made major improvements to the introductory ACRN documentation including:
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.. rst-class:: rst-columns2
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* :ref:`introduction`
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* :ref:`overview_dev`
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* :ref:`gsg`
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* :ref:`acrn_configuration_tool`
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We’ve also made edits throughout the documentation to improve clarity,
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formatting, and presentation:
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.. rst-class:: rst-columns2
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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-virtio-devices`
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* :ref:`hld-io-emulation`
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* :ref:`virtio-net`
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* :ref:`acrn_on_qemu`
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* :ref:`cpu_sharing`
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* :ref:`nested_virt`
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* :ref:`setup_openstack_libvirt`
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* :ref:`using_hybrid_mode_on_nuc`
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* :ref:`acrn_doc`
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Fixed Issues Details
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********************
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.. comment example item
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- :acrn-issue:`5626` - [CFL][industry] Host Call Trace once detected
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Known Issues
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************
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