linux-kernel - [PATCH 09/11] x86/smpboot.c: Early update ucode on AP

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Date:	Sat, 18 Aug 2012 01:15:27 -0700
From:	"Fenghua Yu" <fenghua.yu@...el.com>
To:	"H Peter Anvin" <hpa@...or.com>, "Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Asit K Mallick" <asit.k.mallick@...el.com>,
	"Tigran Aivazian" <tigran@...azian.fsnet.co.uk>,
	"Andreas Herrmann" <andreas.herrmann3@....com>,
	"Borislav Petkov" <borislav.petkov@....com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"x86" <x86@...nel.org>
Cc:	"Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH 09/11] x86/smpboot.c: Early update ucode on AP

From: Fenghua Yu <fenghua.yu@...el.com>

This updates ucode on AP. At this point, BSP should store some valid ucode
patches in memory if it finds the ucode patches in initrd. AP searches the
stored ucode and uploads the ucode.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 arch/x86/kernel/smpboot.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 7c5a8c3..c72e230 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -76,6 +76,7 @@
 #include <asm/i8259.h>
 
 #include <asm/realmode.h>
+#include <asm/microcode.h>
 
 /* State of each CPU */
 DEFINE_PER_CPU(int, cpu_state) = { 0 };
@@ -239,6 +240,12 @@ notrace static void __cpuinit start_secondary(void *unused)
 	 * most necessary things.
 	 */
 	cpu_init();
+	/*
+	 * Load microcode on this cpu if a valid microcode is available.
+	 * This is early microcode loading procedure.
+	 */
+	load_ucode_ap();
+
 	x86_cpuinit.early_percpu_clock_init();
 	preempt_disable();
 	smp_callin();
-- 
1.7.2

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