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- .. SPDX-License-Identifier: GPL-2.0
- ACRN Hypervisor Introduction
- ============================
- The ACRN Hypervisor is a Type 1 hypervisor, running directly on bare-metal
- hardware. It has a privileged management VM, called Service VM, to manage User
- VMs and do I/O emulation.
- ACRN userspace is an application running in the Service VM that emulates
- devices for a User VM based on command line configurations. ACRN Hypervisor
- Service Module (HSM) is a kernel module in the Service VM which provides
- hypervisor services to the ACRN userspace.
- Below figure shows the architecture.
- ::
- Service VM User VM
- +----------------------------+ | +------------------+
- | +--------------+ | | | |
- | |ACRN userspace| | | | |
- | +--------------+ | | | |
- |-----------------ioctl------| | | | ...
- |kernel space +----------+ | | | |
- | | HSM | | | | Drivers |
- | +----------+ | | | |
- +--------------------|-------+ | +------------------+
- +---------------------hypercall----------------------------------------+
- | ACRN Hypervisor |
- +----------------------------------------------------------------------+
- | Hardware |
- +----------------------------------------------------------------------+
- ACRN userspace allocates memory for the User VM, configures and initializes the
- devices used by the User VM, loads the virtual bootloader, initializes the
- virtual CPU state and handles I/O request accesses from the User VM. It uses
- ioctls to communicate with the HSM. HSM implements hypervisor services by
- interacting with the ACRN Hypervisor via hypercalls. HSM exports a char device
- interface (/dev/acrn_hsm) to userspace.
- The ACRN hypervisor is open for contribution from anyone. The source repo is
- available at https://github.com/projectacrn/acrn-hypervisor.
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