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x86/microcode/intel: Save microcode patch unconditionally

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commit 84749d8375 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>
This commit is contained in:
Borislav Petkov
2018-04-21 10:19:29 +02:00
committed by Greg Kroah-Hartman
parent 09e43b9be9
commit c11a6ed509
1 changed files with 0 additions and 2 deletions
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2
arch/x86/kernel/cpu/microcode/intel.c
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@@ -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)