Re: [PATCH] dracut: add support for updating the CPU microcode

[Andrei Borzenkov <arvidjaar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

16.04.2016 02:18, Guido Trentalancia пишет:
> This is the initial version of a new "microcode" dracut module
> that can be used to update the microcode on Intel(R) CPUs.
> 

??? dracut already supports early microcode loading, why it is not
enough and what problem this patch solves?

> Signed-off-by: Guido Trentalancia <guido-D1bseh+SzQhuxeB9wqlrNw@public.gmane.org>
> ---
>  modules.d/00microcode/module-setup.sh |   26 ++++++++++++++++++++++++++
>  modules.d/99base/init.sh              |    9 +++++++++
>  2 files changed, 35 insertions(+)
> 
> diff -pruN dracut-git/modules.d/00microcode/module-setup.sh dracut-git-microcode-update/modules.d/00microcode/module-setup.sh
> --- dracut-git/modules.d/00microcode/module-setup.sh	1970-01-01 01:00:00.000000000 +0100
> +++ dracut-git-microcode-update/modules.d/00microcode/module-setup.sh	2016-04-16 01:11:20.719287468 +0200
> @@ -0,0 +1,26 @@
> +#!/bin/bash
> +
> +# Dracut module to update the microcode on Intel(R) CPUs
> +# Copyright 2016 Guido Trentalancia <guido-D1bseh+SzQhuxeB9wqlrNw@public.gmane.org>
> +
> +# called by dracut
> +check() {
> +    [[ "$mount_needs" ]] && return 1
> +
> +    require_binaries microcode_ctl || return 1
> +
> +    return 0
> +}
> +
> +# called by dracut
> +depends() {
> +    return 0
> +}
> +
> +# called by dracut
> +install() {
> +    inst microcode_ctl
> +
> +    inst_dir /lib/firmware
> +    inst /lib/firmware/microcode.dat
> +}
> diff -pruN dracut-git/modules.d/99base/init.sh dracut-git-microcode-update/modules.d/99base/init.sh
> --- dracut-git/modules.d/99base/init.sh	2016-04-14 22:21:22.681548895 +0200
> +++ dracut-git-microcode-update/modules.d/99base/init.sh	2016-04-16 01:09:58.517080944 +0200
> @@ -62,6 +62,15 @@ if ! ismounted /dev/shm; then
>      mount -t tmpfs -o mode=1777,noexec,nosuid,nodev,strictatime tmpfs /dev/shm >/dev/null
>  fi
>  
> +# Update CPU microcode
> +if [ -x /usr/sbin/microcode_ctl ]; then
> +    MICROCODE_CTL=/usr/sbin/microcode_ctl
> +elif [ -x /sbin/microcode_ctl ]; then
> +    MICROCODE_CTL=/sbin/microcode_ctl
> +fi
> +[ $MICROCODE_CTL ] && [ ! -e /dev/cpu/microcode ] && echo "Creating microcode update device..." && mknod /dev/cpu/microcode c 10 184
> +[ $MICROCODE_CTL ] && [ -e /lib/firmware/microcode.dat ] && $MICROCODE_CTL -u
> +
>  if ! ismounted /run; then
>      mkdir -m 0755 /newrun
>      if ! str_starts "$(readlink -f /bin/sh)" "/run/"; then
> --
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