47 lines
1.7 KiB
Diff
47 lines
1.7 KiB
Diff
From fb86b97300d930b57471068720c52bfa8622eab7 Mon Sep 17 00:00:00 2001
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From: Borislav Petkov <bp@suse.de>
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Date: Tue, 18 Nov 2014 10:46:57 +0100
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Subject: [PATCH] x86, microcode: Update BSPs microcode on resume
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In the situation when we apply early microcode but do *not* apply late
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microcode, we fail to update the BSP's microcode on resume because we
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haven't initialized the uci->mc microcode pointer. So, in order to
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alleviate that, we go and dig out the stashed microcode patch during
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early boot. It is basically the same thing that is done on the APs early
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during boot so do that too here.
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Tested-by: alex.schnaidt@gmail.com
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Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=88001
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Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
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Cc: Fenghua Yu <fenghua.yu@intel.com>
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Cc: <stable@vger.kernel.org> # v3.9
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Signed-off-by: Borislav Petkov <bp@suse.de>
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Link: http://lkml.kernel.org/r/20141118094657.GA6635@pd.tnic
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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arch/x86/kernel/cpu/microcode/core.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
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index dd9d619..2ce9051 100644
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--- a/arch/x86/kernel/cpu/microcode/core.c
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+++ b/arch/x86/kernel/cpu/microcode/core.c
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@@ -465,6 +465,14 @@ static void mc_bp_resume(void)
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if (uci->valid && uci->mc)
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microcode_ops->apply_microcode(cpu);
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+ else if (!uci->mc)
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+ /*
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+ * We might resume and not have applied late microcode but still
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+ * have a newer patch stashed from the early loader. We don't
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+ * have it in uci->mc so we have to load it the same way we're
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+ * applying patches early on the APs.
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+ */
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+ load_ucode_ap();
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}
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static struct syscore_ops mc_syscore_ops = {
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--
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2.1.3
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