Patch "x86/microcode/intel: Look into the patch cache first" has been added to the 4.14-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    x86/microcode/intel: Look into the patch cache first

to the 4.14-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-intel-look-into-the-patch-cache-first.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d8c3b52c00a05036e0a6b315b4b17921a7b67997 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 28 Feb 2018 11:28:44 +0100
Subject: x86/microcode/intel: Look into the patch cache first

From: Borislav Petkov <bp@suse.de>

commit d8c3b52c00a05036e0a6b315b4b17921a7b67997 upstream.

The cache might contain a newer patch - look in there first.

A follow-on change will make sure newest patches are loaded into the
cache of microcode patches.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Ashok Raj <ashok.raj@intel.com>
Cc: Arjan Van De Ven <arjan.van.de.ven@intel.com>
Link: https://lkml.kernel.org/r/20180228102846.13447-6-bp@alien8.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/kernel/cpu/microcode/intel.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -791,9 +791,9 @@ static int collect_cpu_info(int cpu_num,
 
 static enum ucode_state apply_microcode_intel(int cpu)
 {
-	struct microcode_intel *mc;
-	struct ucode_cpu_info *uci;
+	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
+	struct microcode_intel *mc;
 	static int prev_rev;
 	u32 rev;
 
@@ -801,11 +801,10 @@ static enum ucode_state apply_microcode_
 	if (WARN_ON(raw_smp_processor_id() != cpu))
 		return UCODE_ERROR;
 
-	uci = ucode_cpu_info + cpu;
-	mc = uci->mc;
+	/* Look for a newer patch in our cache: */
+	mc = find_patch(uci);
 	if (!mc) {
-		/* Look for a newer patch in our cache: */
-		mc = find_patch(uci);
+		mc = uci->mc;
 		if (!mc)
 			return UCODE_NFOUND;
 	}


Patches currently in stable-queue which might be from bp@suse.de are

queue-4.14/x86-microcode-intel-check-microcode-revision-before-updating-sibling-threads.patch
queue-4.14/x86-microcode-attempt-late-loading-only-when-new-microcode-is-present.patch
queue-4.14/x86-microcode-propagate-return-value-from-updating-functions.patch
queue-4.14/x86-cpu-check-cpu-feature-bits-after-microcode-upgrade.patch
queue-4.14/x86-microcode-intel-writeback-and-invalidate-caches-before-updating-microcode.patch
queue-4.14/x86-microcode-intel-look-into-the-patch-cache-first.patch
queue-4.14/edac-mv64x60-fix-an-error-handling-path.patch
queue-4.14/x86-microcode-request-microcode-on-the-bsp.patch
queue-4.14/x86-microcode-get-rid-of-struct-apply_microcode_ctx.patch
queue-4.14/x86-microcode-fix-cpu-synchronization-routine.patch
queue-4.14/x86-microcode-synchronize-late-microcode-loading.patch
queue-4.14/x86-microcode-do-not-upload-microcode-if-cpus-are-offline.patch
queue-4.14/x86-cpu-add-a-microcode-loader-callback.patch