| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20190427145826.6761a4cf@coco.lan>
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
Powered by blists - more mailing lists