Build ACRN from Source¶
Following a general embedded-system programming model, the ACRN hypervisor is designed to be customized at build time per hardware platform and per usage scenario, rather than one binary for all scenarios.
The hypervisor binary is generated based on Kconfig configuration settings. Instructions about these settings can be found in Step 4: Build the hypervisor configuration.
A generic configuration named
is provided to help developers try out ACRN more easily.
This configuration works for most x86-based platforms; it is supported
with limited features. It can be enabled by specifying
make command line.
One binary for all platforms and all usage scenarios is currently not supported, primarily because dynamic configuration parsing is restricted in the ACRN hypervisor for the following reasons:
- Maintain functional safety requirements. Implementing dynamic parsing introduces dynamic objects, which violates functional safety requirements.
- Reduce complexity. ACRN is a lightweight reference hypervisor, built for embedded IoT. As new platforms for embedded systems are rapidly introduced, support for one binary could require more and more complexity in the hypervisor, which is something we strive to avoid.
- Maintain small footprint. Implementing dynamic parsing introduces hundreds or thousands of lines of code. Avoiding dynamic parsing helps keep the hypervisor’s Lines of Code (LOC) in a desirable range (less than 40K).
- Improve boot up time. Dynamic parsing at runtime increases the boot up time. Using a build-time configuration and not dynamic parsing helps improve the boot up time of the hypervisor.
Build the ACRN hypervisor, device model, and tools from source by following these steps.
Step 1: Install build tools and dependencies¶
ACRN development is supported on popular Linux distributions, each with their own way to install development tools. This user guide covers the different steps to configure and build ACRN natively on your distribution. Refer to the Building ACRN in Docker user guide for instructions on how to build ACRN using a container.
menuconfig, a python3 text-based user interface (TUI) for configuring hypervisor options and using python’s
Install the necessary tools for the following systems:
Clear Linux OS development system:
$ sudo swupd bundle-add os-clr-on-clr os-core-dev python3-basic $ pip3 install --user kconfiglib
Ubuntu development system:
$ sudo apt install gcc \ git \ make \ gnu-efi \ libssl-dev \ libpciaccess-dev \ uuid-dev \ libsystemd-dev \ libevent-dev \ libxml2-dev \ libusb-1.0-0-dev \ python3 \ python3-pip \ libblkid-dev \ e2fslibs-dev \ pkg-config \ zlib1g-dev \ libnuma-dev $ sudo pip3 install kconfiglib
gccversion 7.3.* or higher to avoid gcc compilation issues. Follow these instructions to install the
gcc-7package on Ubuntu 18.04:
$ sudo add-apt-repository ppa:ubuntu-toolchain-r/test $ sudo apt update $ sudo apt install g++-7 -y $ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60 \ --slave /usr/bin/g++ g++ /usr/bin/g++-7
ACRN development requires
binutilsversion 2.27 (or higher). Verify your version of
binutilswith the command
apt show binutils.
Step 2: Get the ACRN hypervisor source code¶
The acrn-hypervisor repository contains four main components:
- The ACRN hypervisor code, located in the
- The EFI stub code, located in the
- The ACRN device model code, located in the
- The ACRN tools source code, located in the
Enter the following to get the acrn-hypervisor source code:
$ git clone https://github.com/projectacrn/acrn-hypervisor
Step 3: Build with the ACRN scenario¶
Currently, the ACRN hypervisor defines these typical usage scenarios:
- The SDC (Software Defined Cockpit) scenario defines a simple automotive use case that includes one pre-launched Service VM and one post-launched User VM.
- SDC2 (Software Defined Cockpit 2) is an extended scenario for an automotive SDC system. SDC2 defines one pre-launched Service VM and up to three post-launched VMs.
- This scenario defines two pre-launched VMs.
- This is a typical scenario for industrial usage with up to four VMs: one pre-launched Service VM, one post-launched Standard VM for Human interaction (HMI), and one or two post-launched RT VMs for real-time control.
- This scenario defines a hybrid use case with three VMs: one pre-launched VM, one pre-launched Service VM, and one post-launched Standard VM.
Assuming that you are at the top level of the acrn-hypervisor directory, perform the following:
The release version is built by default, ‘RELEASE=0’ builds the debug version.
INDUSTRYscenario on the
$ make all BOARD=nuc7i7dnb SCENARIO=industry RELEASE=0
INDUSTRYscenario on the
$ make all BOARD=whl-ipc-i5 SCENARIO=industry BOARD_FILE=/absolute_path/ acrn-hypervisor/misc/acrn-config/xmls/board-xmls/whl-ipc-i5.xml SCENARIO_FILE= /absolute_patch/acrn-hypervisor/misc/acrn-config/xmls/config-xmls/whl-ipc-i5/industry.xml RELEASE=0
SDCscenario on the
$ make all BOARD=nuc6cayh SCENARIO=sdc RELEASE=0
See the Supported Hardware document for information about platform needs for each scenario.
Step 4: Build the hypervisor configuration¶
Modify the hypervisor configuration¶
The ACRN hypervisor leverages Kconfig to manage configurations; it is
Kconfiglib. A default configuration is generated based on the
board you have selected via the
BOARD= command line parameter. You can
make further changes to that default configuration to adjust to your specific
To generate hypervisor configurations, you must build the hypervisor
individually. The following steps generate a default but complete
configuration, based on the platform selected, assuming that you are at the
top level of the acrn-hypervisor directory. The configuration file, named
.config, can be found under the target folder of your build.
$ cd hypervisor $ make defconfig BOARD=nuc6cayh
The BOARD specified is used to select a
arch/x86/configs/. The other command line-based options (e.g.
RELEASE) take no effect when generating a defconfig.
To modify the hypervisor configurations, you can either edit
manually, or you can invoke a TUI-based menuconfig–powered by kconfiglib–by
make menuconfig. As an example, the following commands
(assuming that you are at the top level of the acrn-hypervisor directory)
generate a default configuration file for UEFI, allowing you to modify some
configurations and build the hypervisor using the updated
# Modify the configurations per your needs $ cd ../ # Enter top-level folder of acrn-hypervisor source $ make menuconfig -C hypervisor BOARD=kbl-nuc-i7 <select industry scenario>
menuconfig is python3 only.
Refer to the help on menuconfig for a detailed guide on the interface:
$ pydoc3 menuconfig
Step 5: Build the hypervisor, device model, and tools¶
Now you can build all these components at once as follows:
$ make FIRMWARE=uefi # Build the UEFI hypervisor with the new .config
The build results are found in the
build directory. You can specify
a different Output folder by setting the
make O=build-nuc BOARD=nuc6cayh.
If you only need the hypervisor, use this command:
$ make clean # Remove files previously built $ make -C hypervisor $ make -C misc/efi-stub HV_OBJDIR=$PWD/hypervisor/build EFI_OBJDIR=$PWD/hypervisor/build
acrn.efi will be generated in the
./hypervisor/build/acrn.efi directory hypervisor.
As mentioned in ACRN Configuration Tool, the Board configuration and VM configuration can be imported from XML files. If you want to build the hypervisor with XML configuration files, specify the file location as follows:
$ make BOARD_FILE=$PWD/misc/acrn-config/xmls/board-xmls/nuc7i7dnb.xml \ SCENARIO_FILE=$PWD/misc/acrn-config/xmls/config-xmls/nuc7i7dnb/industry.xml FIRMWARE=uefi
Note that the file path must be absolute. Both of the
SCENARIO parameters are not needed because the information is retrieved from the XML file. Adjust the example above to your own environment path.
Follow the same instructions to boot and test the images you created from your build.