Patch "x86/speculation: Update Speculation Control microcode blacklist" has been added to the 4.15-stable tree

Patch "x86/speculation: Update Speculation Control microcode blacklist" has been added to the 4.15-stable tree

[gregkh]

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

    x86/speculation: Update 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;a=summary

The filename of the patch is:
     x86-speculation-update-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 1751342095f0d2b36fa8114d8e12c5688c455ac4 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw@amazon.co.uk>
Date: Sat, 10 Feb 2018 23:39:22 +0000
Subject: x86/speculation: Update Speculation Control microcode blacklist

From: David Woodhouse <dwmw@amazon.co.uk>

commit 1751342095f0d2b36fa8114d8e12c5688c455ac4 upstream.

Intel have retroactively blessed the 0xc2 microcode on Skylake mobile
and desktop parts, and the Gemini Lake 0x22 microcode is apparently fine
too. We blacklisted the latter purely because it was present with all
the other problematic ones in the 2018-01-08 release, but now it's
explicitly listed as OK.

We still list 0x84 for the various Kaby Lake / Coffee Lake parts, as
that appeared in one version of the blacklist and then reverted to
0x80 again. We can change it if 0x84 is actually announced to be safe.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: arjan.van.de.ven@intel.com
Cc: jmattson@google.com
Cc: karahmed@amazon.de
Cc: kvm@vger.kernel.org
Cc: pbonzini@redhat.com
Cc: rkrcmar@redhat.com
Cc: sironi@amazon.de
Link: http://lkml.kernel.org/r/1518305967-31356-2-git-send-email-dwmw@amazon.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/kernel/cpu/intel.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -123,8 +123,6 @@ static const struct sku_microcode spectr
 	{ INTEL_FAM6_KABYLAKE_MOBILE,	0x09,	0x84 },
 	{ INTEL_FAM6_SKYLAKE_X,		0x03,	0x0100013e },
 	{ INTEL_FAM6_SKYLAKE_X,		0x04,	0x0200003c },
-	{ INTEL_FAM6_SKYLAKE_MOBILE,	0x03,	0xc2 },
-	{ 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 },
@@ -136,8 +134,6 @@ static const struct sku_microcode spectr
 	{ INTEL_FAM6_HASWELL_X,		0x02,	0x3b },
 	{ INTEL_FAM6_HASWELL_X,		0x04,	0x10 },
 	{ INTEL_FAM6_IVYBRIDGE_X,	0x04,	0x42a },
-	/* Updated in the 20180108 release; blacklist until we know otherwise */
-	{ INTEL_FAM6_ATOM_GEMINI_LAKE,	0x01,	0x22 },
 	/* Observed in the wild */
 	{ INTEL_FAM6_SANDYBRIDGE_X,	0x06,	0x61b },
 	{ INTEL_FAM6_SANDYBRIDGE_X,	0x07,	0x712 },


Patches currently in stable-queue which might be from dwmw@amazon.co.uk are

queue-4.15/kvm-nvmx-set-the-cpu_based_use_msr_bitmaps-if-we-have-a-valid-l02-msr-bitmap.patch
queue-4.15/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.15/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.15/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.15/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.15/x86-speculation-clean-up-various-spectre-related-details.patch
queue-4.15/revert-x86-speculation-simplify-indirect_branch_prediction_barrier.patch