This is a note to let you know that I've just added the patch titled
x86, microcode: Update BSPs microcode on resume
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-microcode-update-bsps-microcode-on-resume.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fb86b97300d930b57471068720c52bfa8622eab7 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@xxxxxxx>
Date: Tue, 18 Nov 2014 10:46:57 +0100
Subject: x86, microcode: Update BSPs microcode on resume
From: Borislav Petkov <bp@xxxxxxx>
commit fb86b97300d930b57471068720c52bfa8622eab7 upstream.
In the situation when we apply early microcode but do *not* apply late
microcode, we fail to update the BSP's microcode on resume because we
haven't initialized the uci->mc microcode pointer. So, in order to
alleviate that, we go and dig out the stashed microcode patch during
early boot. It is basically the same thing that is done on the APs early
during boot so do that too here.
Tested-by: alex.schnaidt@xxxxxxxxx
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=88001
Cc: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: http://lkml.kernel.org/r/20141118094657.GA6635@xxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/microcode/core.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -465,6 +465,14 @@ static void mc_bp_resume(void)
if (uci->valid && uci->mc)
microcode_ops->apply_microcode(cpu);
+ else if (!uci->mc)
+ /*
+ * We might resume and not have applied late microcode but still
+ * have a newer patch stashed from the early loader. We don't
+ * have it in uci->mc so we have to load it the same way we're
+ * applying patches early on the APs.
+ */
+ load_ucode_ap();
}
static struct syscore_ops mc_syscore_ops = {
Patches currently in stable-queue which might be from bp@xxxxxxx are
queue-3.17/x86-microcode-update-bsps-microcode-on-resume.patch
queue-3.17/uprobes-x86-fix-_tif_uprobe-vs-_tif_notify_resume.patch
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