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doc: add hv parameter usage

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The hv parameter could be configured in GRUB menu, currently we support
"uart=" parameter to override uart settings.

The patch also has modifications on tutorial of using_grub.

Signed-off-by: Victor Sun <victor.sun@intel.com>
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
This commit is contained in:
Victor Sun
2020-06-16 01:52:23 +08:00
committed by David Kinder
parent 5119fa0673
commit 780c87d9da
6 changed files with 150 additions and 83 deletions
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19
doc/introduction/index.rst
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@@ -26,7 +26,8 @@ user VM sharing optimizations for IoT and embedded devices.
ACRN Open Source Roadmap 2020
*****************************
Stay informed on what's ahead for ACRN in 2020 by visiting the `ACRN 2020 Roadmap <https://projectacrn.org/wp-content/uploads/sites/59/2020/03/ACRN-Roadmap-External-2020.pdf>`_.
Stay informed on what's ahead for ACRN in 2020 by visiting the
`ACRN 2020 Roadmap <https://projectacrn.org/wp-content/uploads/sites/59/2020/03/ACRN-Roadmap-External-2020.pdf>`_.
For up-to-date happenings, visit the `ACRN blog <https://projectacrn.org/blog/>`_.
@@ -411,8 +412,8 @@ bootloader used by the Operating System (OS).
Direct boot mode
================
The ACRN hypervisor could be boot from a third-party bootloader directly and we
called this **Direct boot mode**. The most popular bootloader is `grub`_, it is
The ACRN hypervisor can be booted from a third-party bootloader
directly, called **Direct boot mode**. A popular bootloader is `grub`_ and is
also widely used by Linux distributions.
:ref:`using_grub` has a introduction on how to boot ACRN hypervisor with GRUB.
@@ -435,14 +436,18 @@ The Boot process proceeds as follows:
the ACRN Device Model and Virtual bootloader through ``dm-verity``.
#. The virtual bootloader starts the User-side verified boot process.
In this boot mode, the boot options are defined via the ``VM{x}_CONFIG_OS_BOOTARGS``
macro in the source code (replace ``{x}`` with the VM number) by default. But they
could be overridden by GRUB menu also. Please check :ref:`using_grub` for details.
In this boot mode, the boot options of pre-launched VM and service VM are defined
in the variable of ``bootargs`` of struct ``vm_configs[vm id].os_config``
in the source code ``hypervisor/$(SCENARIO)/vm_configurations.c`` by default.
Their boot options can be overridden by the GRUB menu. See :ref:`using_grub` for
details. The boot options of post-launched VM is not covered by hypervisor
source code or GRUB menu, it is defined in guest image file or specified by
launch scripts.
.. note::
`Slim Bootloader`_ is an alternative boot firmware that can be used to
boot ACRN with **Direct boot mode**. The `Boot ACRN Hyervisor
boot ACRN in **Direct boot mode**. The `Boot ACRN Hypervisor
<https://slimbootloader.github.io/how-tos/boot-acrn.html>`_ tutorial
provides more information on how to use SBL with ACRN.