x86/microcode/intel: Save microcode patch unconditionally

commit 84749d83758af6576552046b215b9b7f37f9556b upstream.

save_mc_for_early() was a no-op on !CONFIG_HOTPLUG_CPU but the
generic_load_microcode() path saves the microcode patches it has found into
the cache of patches which is used for late loading too. Regardless of
whether CPU hotplug is used or not.

Make the saving unconditional so that late loading can find the proper
patch.

Reported-by: Vitezslav Samel <vitezslav@samel.cz>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Vitezslav Samel <vitezslav@samel.cz>
Tested-by: Ashok Raj <ashok.raj@intel.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20180418081140.GA2439@pc11.op.pod.cz
Link: https://lkml.kernel.org/r/20180421081930.15741-1-bp@alien8.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 4bcd30c875315a14f64f7641f4631c6e8ec863cb..79291d6fb301dbbe5a3a3a4d6f58238913195121 100644 (file)
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -474,7 +474,6 @@ static void show_saved_mc(void)
  */
 static void save_mc_for_early(u8 *mc)
 {
-#ifdef CONFIG_HOTPLUG_CPU
        /* Synchronization during CPU hotplug. */
        static DEFINE_MUTEX(x86_cpu_microcode_mutex);
 
@@ -521,7 +520,6 @@ static void save_mc_for_early(u8 *mc)
 
 out:
        mutex_unlock(&x86_cpu_microcode_mutex);
-#endif
 }
 
 static bool __init load_builtin_intel_microcode(struct cpio_data *cp)