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

x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: x86-speculation-remove-skylake-c2-from-speculation-control-microcode-blacklist.patch and it can be found in the queue-4.15 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 e3b3121fa8da94cb20f9e0c64ab7981ae47fd085 Mon Sep 17 00:00:00 2001

From: Alexander Sergeyev sergeev917@gmail.com Date: Tue, 13 Mar 2018 22:38:56 +0300 Subject: x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist

From: Alexander Sergeyev sergeev917@gmail.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@gmail.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Jia Zhang qianyue.zj@alibaba-inc.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Kyle Huey me@kylehuey.com Cc: David Woodhouse dwmw@amazon.co.uk Link: https://lkml.kernel.org/r/20180313193856.GA8580@localhost.localdomain Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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 @@ -105,7 +105,7 @@ static void probe_xeon_phi_r3mwait(struc /* * 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-upd... + * - https://newsroom.intel.com/wp-content/uploads/sites/11/2018/03/microcode-upd... * - https://kb.vmware.com/s/article/52345 * - Microcode revisions observed in the wild * - Release note from 20180108 microcode release @@ -123,7 +123,6 @@ 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 },

Patches currently in stable-queue which might be from sergeev917@gmail.com are

queue-4.15/x86-speculation-remove-skylake-c2-from-speculation-control-microcode-blacklist.patch