Patch "[PATCH 23/27] s390/speculation: Support 'mitigations=' cmdline option" has been added to the 5.0-stable tree
gregkh at linuxfoundation.org
gregkh at linuxfoundation.org
Wed May 15 03:06:17 AEST 2019
This is a note to let you know that I've just added the patch titled
[PATCH 23/27] s390/speculation: Support 'mitigations=' cmdline option
to the 5.0-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:
0023-s390-speculation-Support-mitigations-cmdline-option.patch
and it can be found in the queue-5.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.
>From aa18d76c6cd803424e787d15d6af34d7339c8419 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe at redhat.com>
Date: Fri, 12 Apr 2019 15:39:31 -0500
Subject: [PATCH 23/27] s390/speculation: Support 'mitigations=' cmdline option
commit 0336e04a6520bdaefdb0769d2a70084fa52e81ed upstream
Configure s390 runtime CPU speculation bug mitigations in accordance
with the 'mitigations=' cmdline option. This affects Spectre v1 and
Spectre v2.
The default behavior is unchanged.
Signed-off-by: Josh Poimboeuf <jpoimboe at redhat.com>
Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
Tested-by: Jiri Kosina <jkosina at suse.cz> (on x86)
Reviewed-by: Jiri Kosina <jkosina at suse.cz>
Cc: Borislav Petkov <bp at alien8.de>
Cc: "H . Peter Anvin" <hpa at zytor.com>
Cc: Andy Lutomirski <luto at kernel.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Jiri Kosina <jikos at kernel.org>
Cc: Waiman Long <longman at redhat.com>
Cc: Andrea Arcangeli <aarcange at redhat.com>
Cc: Jon Masters <jcm at redhat.com>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: linuxppc-dev at lists.ozlabs.org
Cc: Martin Schwidefsky <schwidefsky at de.ibm.com>
Cc: Heiko Carstens <heiko.carstens at de.ibm.com>
Cc: linux-s390 at vger.kernel.org
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will.deacon at arm.com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-arch at vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: Tyler Hicks <tyhicks at canonical.com>
Cc: Linus Torvalds <torvalds at linux-foundation.org>
Cc: Randy Dunlap <rdunlap at infradead.org>
Cc: Steven Price <steven.price at arm.com>
Cc: Phil Auld <pauld at redhat.com>
Link: https://lkml.kernel.org/r/e4a161805458a5ec88812aac0307ae3908a030fc.1555085500.git.jpoimboe@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
Documentation/admin-guide/kernel-parameters.txt | 5 +++--
arch/s390/kernel/nospec-branch.c | 3 ++-
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index ed9ec2ea362d..9aa3543a8723 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2540,7 +2540,7 @@
http://repo.or.cz/w/linux-2.6/mini2440.git
mitigations=
- [X86,PPC] Control optional mitigations for CPU
+ [X86,PPC,S390] Control optional mitigations for CPU
vulnerabilities. This is a set of curated,
arch-independent options, each of which is an
aggregation of existing arch-specific options.
@@ -2551,7 +2551,8 @@
expose users to several CPU vulnerabilities.
Equivalent to: nopti [X86,PPC]
nospectre_v1 [PPC]
- nospectre_v2 [X86,PPC]
+ nobp=0 [S390]
+ nospectre_v2 [X86,PPC,S390]
spectre_v2_user=off [X86]
spec_store_bypass_disable=off [X86,PPC]
l1tf=off [X86]
diff --git a/arch/s390/kernel/nospec-branch.c b/arch/s390/kernel/nospec-branch.c
index bdddaae96559..649135cbedd5 100644
--- a/arch/s390/kernel/nospec-branch.c
+++ b/arch/s390/kernel/nospec-branch.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/cpu.h>
#include <asm/nospec-branch.h>
static int __init nobp_setup_early(char *str)
@@ -58,7 +59,7 @@ early_param("nospectre_v2", nospectre_v2_setup_early);
void __init nospec_auto_detect(void)
{
- if (test_facility(156)) {
+ if (test_facility(156) || cpu_mitigations_off()) {
/*
* The machine supports etokens.
* Disable expolines and disable nobp.
--
2.21.0
Patches currently in stable-queue which might be from jpoimboe at redhat.com are
queue-5.0/0019-x86-speculation-mds-Print-SMT-vulnerable-on-MSBDS-wi.patch
queue-5.0/0016-x86-speculation-Move-arch_smt_update-call-to-after-m.patch
queue-5.0/0024-x86-speculation-mds-Add-mitigations-support-for-MDS.patch
queue-5.0/0021-x86-speculation-Support-mitigations-cmdline-option.patch
queue-5.0/0022-powerpc-speculation-Support-mitigations-cmdline-opti.patch
queue-5.0/0020-cpu-speculation-Add-mitigations-cmdline-option.patch
queue-5.0/0023-s390-speculation-Support-mitigations-cmdline-option.patch
queue-5.0/0015-x86-speculation-mds-Add-mds-full-nosmt-cmdline-optio.patch
queue-5.0/0027-x86-speculation-mds-Fix-documentation-typo.patch
queue-5.0/0017-x86-speculation-mds-Add-SMT-warning-message.patch
queue-5.0/0018-x86-speculation-mds-Fix-comment.patch
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