Date:   Sat, 27 Apr 2019 14:58:26 -0300
From:   Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
To:     Changbin Du <changbin.du@...il.com>
Cc:     Jonathan Corbet <corbet@....net>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/27] Documentation: x86: convert microcode.txt to reST

Em Fri, 26 Apr 2019 23:31:39 +0800
Changbin Du <changbin.du@...il.com> escreveu:

> This converts the plain text documentation to reStructuredText format and
> add it to Sphinx TOC tree. No essential content change.
> 
> Signed-off-by: Changbin Du <changbin.du@...il.com>

Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>

> ---
>  Documentation/x86/index.rst                   |  1 +
>  .../x86/{microcode.txt => microcode.rst}      | 62 ++++++++++---------
>  2 files changed, 35 insertions(+), 28 deletions(-)
>  rename Documentation/x86/{microcode.txt => microcode.rst} (81%)
> 
> diff --git a/Documentation/x86/index.rst b/Documentation/x86/index.rst
> index 1c675cef14d7..2fcd10f29b87 100644
> --- a/Documentation/x86/index.rst
> +++ b/Documentation/x86/index.rst
> @@ -22,3 +22,4 @@ Linux x86 Support
>     intel_mpx
>     amd-memory-encryption
>     pti
> +   microcode
> diff --git a/Documentation/x86/microcode.txt b/Documentation/x86/microcode.rst
> similarity index 81%
> rename from Documentation/x86/microcode.txt
> rename to Documentation/x86/microcode.rst
> index 79fdb4a8148a..a320d37982ed 100644
> --- a/Documentation/x86/microcode.txt
> +++ b/Documentation/x86/microcode.rst
> @@ -1,7 +1,11 @@
> -	The Linux Microcode Loader
> +.. SPDX-License-Identifier: GPL-2.0
>  
> -Authors: Fenghua Yu <fenghua.yu@...el.com>
> -	 Borislav Petkov <bp@...e.de>
> +==========================
> +The Linux Microcode Loader
> +==========================
> +
> +:Authors: - Fenghua Yu <fenghua.yu@...el.com>
> +          - Borislav Petkov <bp@...e.de>
>  
>  The kernel has a x86 microcode loading facility which is supposed to
>  provide microcode loading methods in the OS. Potential use cases are
> @@ -10,8 +14,8 @@ and updating the microcode on long-running systems without rebooting.
>  
>  The loader supports three loading methods:
>  
> -1. Early load microcode
> -=======================
> +Early load microcode
> +====================
>  
>  The kernel can update microcode very early during boot. Loading
>  microcode early can fix CPU issues before they are observed during
> @@ -26,8 +30,10 @@ loader parses the combined initrd image during boot.
>  
>  The microcode files in cpio name space are:
>  
> -on Intel: kernel/x86/microcode/GenuineIntel.bin
> -on AMD  : kernel/x86/microcode/AuthenticAMD.bin
> +on Intel:
> +  kernel/x86/microcode/GenuineIntel.bin
> +on AMD  :
> +  kernel/x86/microcode/AuthenticAMD.bin
>  
>  During BSP (BootStrapping Processor) boot (pre-SMP), the kernel
>  scans the microcode file in the initrd. If microcode matching the
> @@ -42,8 +48,8 @@ Here's a crude example how to prepare an initrd with microcode (this is
>  normally done automatically by the distribution, when recreating the
>  initrd, so you don't really have to do it yourself. It is documented
>  here for future reference only).
> +::
>  
> ----
>    #!/bin/bash
>  
>    if [ -z "$1" ]; then
> @@ -76,15 +82,15 @@ here for future reference only).
>    cat ucode.cpio $INITRD.orig > $INITRD
>  
>    rm -rf $TMPDIR
> ----
> +
>  
>  The system needs to have the microcode packages installed into
>  /lib/firmware or you need to fixup the paths above if yours are
>  somewhere else and/or you've downloaded them directly from the processor
>  vendor's site.
>  
> -2. Late loading
> -===============
> +Late loading
> +============
>  
>  There are two legacy user space interfaces to load microcode, either through
>  /dev/cpu/microcode or through /sys/devices/system/cpu/microcode/reload file
> @@ -94,9 +100,9 @@ The /dev/cpu/microcode method is deprecated because it needs a special
>  userspace tool for that.
>  
>  The easier method is simply installing the microcode packages your distro
> -supplies and running:
> +supplies and running::
>  
> -# echo 1 > /sys/devices/system/cpu/microcode/reload
> +  # echo 1 > /sys/devices/system/cpu/microcode/reload
>  
>  as root.
>  
> @@ -104,29 +110,29 @@ The loading mechanism looks for microcode blobs in
>  /lib/firmware/{intel-ucode,amd-ucode}. The default distro installation
>  packages already put them there.
>  
> -3. Builtin microcode
> -====================
> +Builtin microcode
> +=================
>  
>  The loader supports also loading of a builtin microcode supplied through
>  the regular builtin firmware method CONFIG_EXTRA_FIRMWARE. Only 64-bit is
>  currently supported.
>  
> -Here's an example:
> +Here's an example::
>  
> -CONFIG_EXTRA_FIRMWARE="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin"
> -CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware"
> +  CONFIG_EXTRA_FIRMWARE="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin"
> +  CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware"
>  
> -This basically means, you have the following tree structure locally:
> +This basically means, you have the following tree structure locally::
>  
> -/lib/firmware/
> -|-- amd-ucode
> -...
> -|   |-- microcode_amd_fam15h.bin
> -...
> -|-- intel-ucode
> -...
> -|   |-- 06-3a-09
> -...
> +  /lib/firmware/
> +  |-- amd-ucode
> +  ...
> +  |   |-- microcode_amd_fam15h.bin
> +  ...
> +  |-- intel-ucode
> +  ...
> +  |   |-- 06-3a-09
> +  ...
>  
>  so that the build system can find those files and integrate them into
>  the final kernel image. The early loader finds them and applies them.



Thanks,
Mauro

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