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x86/microcode: Collect CPU info on resume 

We need to reread the CPU's microcode revision after resume because
applied microcode gets "forgotten" depending on the sleep state.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20161025095522.11964-9-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Borislav Petkov 2016-10-25 11:55:18 +02:00 committed by Ingo Molnar
parent 6b14b81899
commit 7f709d0c32
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/cpu/microcode/core.c
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@ -498,6 +498,9 @@ static enum ucode_state microcode_update_cpu(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
/* Refresh CPU microcode revision after resume. */
collect_cpu_info(cpu);
if (uci->valid)
return microcode_resume_cpu(cpu);