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Add documentation on the following aspects of ACRN: 1) A brief introduction on the architecture of ACRN. 2) I/O request handling in ACRN. 3) CPUID functions of ACRN. To learn more about ACRN, please go to ACRN project website https://projectacrn.org, or the documentation page https://projectacrn.github.io/. Cc: Dave Hansen <dave.hansen@intel.com> Cc: Sen Christopherson <sean.j.christopherson@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Fengwei Yin <fengwei.yin@intel.com> Cc: Zhi Wang <zhi.a.wang@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Yu Wang <yu1.wang@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Zhi Wang <zhi.a.wang@intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Reviewed-by: Borislav Petkov <bp@suse.de> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-2-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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44 lines
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.. SPDX-License-Identifier: GPL-2.0
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ACRN Hypervisor Introduction
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============================
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The ACRN Hypervisor is a Type 1 hypervisor, running directly on bare-metal
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hardware. It has a privileged management VM, called Service VM, to manage User
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VMs and do I/O emulation.
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ACRN userspace is an application running in the Service VM that emulates
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devices for a User VM based on command line configurations. ACRN Hypervisor
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Service Module (HSM) is a kernel module in the Service VM which provides
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hypervisor services to the ACRN userspace.
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Below figure shows the architecture.
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::
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Service VM User VM
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+----------------------------+ | +------------------+
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| +--------------+ | | | |
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| |ACRN userspace| | | | |
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| +--------------+ | | | |
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|-----------------ioctl------| | | | ...
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|kernel space +----------+ | | | |
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| | HSM | | | | Drivers |
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| +----------+ | | | |
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+--------------------|-------+ | +------------------+
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+---------------------hypercall----------------------------------------+
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| ACRN Hypervisor |
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+----------------------------------------------------------------------+
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| Hardware |
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+----------------------------------------------------------------------+
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ACRN userspace allocates memory for the User VM, configures and initializes the
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devices used by the User VM, loads the virtual bootloader, initializes the
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virtual CPU state and handles I/O request accesses from the User VM. It uses
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ioctls to communicate with the HSM. HSM implements hypervisor services by
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interacting with the ACRN Hypervisor via hypercalls. HSM exports a char device
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interface (/dev/acrn_hsm) to userspace.
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The ACRN hypervisor is open for contribution from anyone. The source repo is
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available at https://github.com/projectacrn/acrn-hypervisor.
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