From: Tomasz Maciej Nowak <tomek_n@o2.pl>
Date: Tue, 20 Nov 2018 16:20:43 +0000 (+0100)
Subject: x86: add intel microcode entries to grub config
X-Git-Url: http://git.openwrt.org/?a=commitdiff_plain;h=74a8b95b69d50bff8f6b3128e18b770cd427d18e;p=openwrt%2Fstaging%2Fjow.git

x86: add intel microcode entries to grub config

Create initrd enries for x86 images, that'll load intel microcode as
early as possible. To achieve that the test module for grub is enabled
which provides shell-like conditionals. Also restrict the late load of
microcode to AMD processors.

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>
(backported from 546fced2a23557e95dd34246744c3aa6cad92fe6)
---

diff --git a/target/linux/x86/base-files/lib/preinit/02_load_x86_ucode b/target/linux/x86/base-files/lib/preinit/02_load_x86_ucode
index fb309c75c1..d3a23e24b2 100644
--- a/target/linux/x86/base-files/lib/preinit/02_load_x86_ucode
+++ b/target/linux/x86/base-files/lib/preinit/02_load_x86_ucode
@@ -2,8 +2,10 @@
 # Copyright (C) 2018 OpenWrt.org
 
 do_load_x86_ucode() {
-	if [ -e "/sys/devices/system/cpu/microcode/reload" ]; then
-		echo 1 > /sys/devices/system/cpu/microcode/reload
+	if grep -q AuthenticAMD /proc/cpuinfo; then
+		if [ -e "/sys/devices/system/cpu/microcode/reload" ]; then
+			echo 1 > /sys/devices/system/cpu/microcode/reload
+		fi
 	fi
 }
 
diff --git a/target/linux/x86/image/Makefile b/target/linux/x86/image/Makefile
index dbf8a8594b..f8c3700d32 100644
--- a/target/linux/x86/image/Makefile
+++ b/target/linux/x86/image/Makefile
@@ -9,8 +9,8 @@ include $(INCLUDE_DIR)/image.mk
 
 export PATH=$(TARGET_PATH):/sbin
 
-GRUB2_MODULES = biosdisk boot chain configfile ext2 linux ls part_msdos reboot serial vga
-GRUB2_MODULES_ISO = biosdisk boot chain configfile iso9660 linux ls part_msdos reboot serial vga
+GRUB2_MODULES = biosdisk boot chain configfile ext2 linux ls part_msdos reboot serial test vga
+GRUB2_MODULES_ISO = biosdisk boot chain configfile iso9660 linux ls part_msdos reboot serial test vga
 GRUB_TERMINALS =
 GRUB_SERIAL_CONFIG =
 GRUB_TERMINAL_CONFIG =
diff --git a/target/linux/x86/image/grub-iso.cfg b/target/linux/x86/image/grub-iso.cfg
index 9c59bdf6d4..5d128aa3aa 100644
--- a/target/linux/x86/image/grub-iso.cfg
+++ b/target/linux/x86/image/grub-iso.cfg
@@ -7,4 +7,7 @@ set root='(cd)'
 
 menuentry "@TITLE@" {
 	linux /boot/vmlinuz @CMDLINE@ noinitrd
+	if [ -s /boot/intel-ucode.img ]; then
+		initrd /boot/intel-ucode.img
+	fi
 }
diff --git a/target/linux/x86/image/grub.cfg b/target/linux/x86/image/grub.cfg
index dedfa0a636..a665686863 100644
--- a/target/linux/x86/image/grub.cfg
+++ b/target/linux/x86/image/grub.cfg
@@ -7,6 +7,9 @@ set root='(@ROOT@)'
 
 menuentry "@TITLE@" {
 	linux /boot/vmlinuz @CMDLINE@ noinitrd
+	if [ -s /boot/intel-ucode.img ]; then
+		initrd /boot/intel-ucode.img
+	fi
 }
 menuentry "@TITLE@ (failsafe)" {
 	linux /boot/vmlinuz failsafe=true @CMDLINE@ noinitrd