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From 84749d83758af6576552046b215b9b7f37f9556b Mon Sep 17 00:00:00 2001
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From: Borislav Petkov <bp@suse.de>
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Date: Sat, 21 Apr 2018 10:19:29 +0200
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Subject: x86/microcode/intel: Save microcode patch unconditionally
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save_mc_for_early() was a no-op on !CONFIG_HOTPLUG_CPU but the
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generic_load_microcode() path saves the microcode patches it has found into
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the cache of patches which is used for late loading too. Regardless of
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whether CPU hotplug is used or not.
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Make the saving unconditional so that late loading can find the proper
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patch.
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Reported-by: Vitezslav Samel <vitezslav@samel.cz>
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Signed-off-by: Borislav Petkov <bp@suse.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Tested-by: Vitezslav Samel <vitezslav@samel.cz>
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Tested-by: Ashok Raj <ashok.raj@intel.com>
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Cc: stable@vger.kernel.org
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Link: http://lkml.kernel.org/r/20180418081140.GA2439@pc11.op.pod.cz
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Link: https://lkml.kernel.org/r/20180421081930.15741-1-bp@alien8.de
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---
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arch/x86/kernel/cpu/microcode/intel.c | 2 --
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1 file changed, 2 deletions(-)
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diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
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index 32b8e57..1c2cfa0 100644
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--- a/arch/x86/kernel/cpu/microcode/intel.c
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+++ b/arch/x86/kernel/cpu/microcode/intel.c
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@@ -485,7 +485,6 @@ static void show_saved_mc(void)
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*/
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static void save_mc_for_early(u8 *mc, unsigned int size)
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{
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-#ifdef CONFIG_HOTPLUG_CPU
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/* Synchronization during CPU hotplug. */
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static DEFINE_MUTEX(x86_cpu_microcode_mutex);
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@@ -495,7 +494,6 @@ static void save_mc_for_early(u8 *mc, unsigned int size)
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show_saved_mc();
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mutex_unlock(&x86_cpu_microcode_mutex);
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-#endif
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}
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static bool load_builtin_intel_microcode(struct cpio_data *cp)
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--
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cgit v1.1
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