Messages in this thread Patch in this message | | | Date | Fri, 20 Apr 2018 12:34:28 +0200 | From | Borislav Petkov <> | Subject | [PATCH 1/2] 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 generic_load_microcode() path saves the microcode patches it has found into our cache of patches which is used for late loading too. Regardless of whether we do CPU hotplug or not.
So 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> Cc: Ashok Raj <ashok.raj@intel.com> Cc: <stable@vger.kernel.org> # if it has backported d8c3b52c00a05036e0a6b315b4b17921a7b67997 Link: http://lkml.kernel.org/r/20180418081140.GA2439@pc11.op.pod.cz --- arch/x86/kernel/cpu/microcode/intel.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c index 32b8e5724f96..1c2cfa0644aa 100644 --- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -485,7 +485,6 @@ static void show_saved_mc(void) */ static void save_mc_for_early(u8 *mc, unsigned int size) { -#ifdef CONFIG_HOTPLUG_CPU /* Synchronization during CPU hotplug. */ static DEFINE_MUTEX(x86_cpu_microcode_mutex); @@ -495,7 +494,6 @@ static void save_mc_for_early(u8 *mc, unsigned int size) show_saved_mc(); mutex_unlock(&x86_cpu_microcode_mutex); -#endif } static bool load_builtin_intel_microcode(struct cpio_data *cp) -- 2.13.0 SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
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