linux-kernel - [PATCH 4.4 043/107] x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist

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Date:   Mon, 23 Jul 2018 14:41:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexander Sergeyev <sergeev917@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jia Zhang <qianyue.zj@...baba-inc.com>,
        Kyle Huey <me@...ehuey.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        "Srivatsa S. Bhat" <srivatsa@...il.mit.edu>,
        "Matt Helsley (VMware)" <matt.helsley@...il.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        Bo Gan <ganb@...are.com>
Subject: [PATCH 4.4 043/107] x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Sergeyev <sergeev917@...il.com>

commit e3b3121fa8da94cb20f9e0c64ab7981ae47fd085 upstream.

In accordance with Intel's microcode revision guidance from March 6 MCU
rev 0xc2 is cleared on both Skylake H/S and Skylake Xeon E3 processors
that share CPUID 506E3.

Signed-off-by: Alexander Sergeyev <sergeev917@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Jia Zhang <qianyue.zj@...baba-inc.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Kyle Huey <me@...ehuey.com>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Link: https://lkml.kernel.org/r/20180313193856.GA8580@localhost.localdomain
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa@...il.mit.edu>
Reviewed-by: Matt Helsley (VMware) <matt.helsley@...il.com>
Reviewed-by: Alexey Makhalov <amakhalov@...are.com>
Reviewed-by: Bo Gan <ganb@...are.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---

 arch/x86/kernel/cpu/intel.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -29,7 +29,7 @@
 /*
  * Early microcode releases for the Spectre v2 mitigation were broken.
  * Information taken from;
- * - https://newsroom.intel.com/wp-content/uploads/sites/11/2018/01/microcode-update-guidance.pdf
+ * - https://newsroom.intel.com/wp-content/uploads/sites/11/2018/03/microcode-update-guidance.pdf
  * - https://kb.vmware.com/s/article/52345
  * - Microcode revisions observed in the wild
  * - Release note from 20180108 microcode release
@@ -47,7 +47,6 @@ static const struct sku_microcode spectr
 	{ INTEL_FAM6_KABYLAKE_MOBILE,	0x09,	0x80 },
 	{ INTEL_FAM6_SKYLAKE_X,		0x03,	0x0100013e },
 	{ INTEL_FAM6_SKYLAKE_X,		0x04,	0x0200003c },
-	{ INTEL_FAM6_SKYLAKE_DESKTOP,	0x03,	0xc2 },
 	{ INTEL_FAM6_BROADWELL_CORE,	0x04,	0x28 },
 	{ INTEL_FAM6_BROADWELL_GT3E,	0x01,	0x1b },
 	{ INTEL_FAM6_BROADWELL_XEON_D,	0x02,	0x14 },