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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hQayF-0004x5-8M; Tue, 14 May 2019 17:12:07 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hQaxx-0004aU-7t for linux-arm-kernel@lists.infradead.org; Tue, 14 May 2019 17:11:55 +0000 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 705D92084A; Tue, 14 May 2019 17:11:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557853908; bh=tEH1pUgSLTYMcLMBlk49WqxJ4UmiPyx4BXwWoxMadtI=; h=Subject:To:Cc:From:Date:From; b=OIsSdV88VWeTlQSWreoBOOJBDYhYkriOwG1u8FzCvmbzOqMGdZpoBmcUhIxvpRWDC 4aQ8JLeKjzdypxAU/6ECdrXmkYVKcODf6v8UJF5zuRXU6Ig95HfRDOZiXXCp3Sfel9 glYmOU3zyNFT0wIHfeX7nAnHJ7PiBTNXR1Zm3bAE= Subject: Patch "[PATCH 25/30] powerpc/speculation: Support 'mitigations=' cmdline" has been added to the 4.19-stable tree To: 245a606e1a42a558a310220312d9b6adb9159df6.1555085500.git.jpoimboe@redhat.com, aarcange@redhat.com, benh@kernel.crashing.org, bp@alien8.de, catalin.marinas@arm.com, gregkh@linuxfoundation.org, heiko.carstens@de.ibm.com, hpa@zytor.com, jcm@redhat.com, jikos@kernel.org, jkosina@suse.cz, jpoimboe@redhat.com, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, longman@redhat.com, luto@kernel.org, mpe@ellerman.id.au, pauld@redhat.com, paulus@samba.org, peterz@infradead.org, rdunlap@infradead.org, schwidefsky@de.ibm.com, steven.price@arm.com, tglx@linutronix.de, torvalds@linux-foundation.org, tyhicks@canonical.com, will.deacon@arm.com From: Date: Tue, 14 May 2019 19:06:14 +0200 Message-ID: <155785357470250@kroah.com> MIME-Version: 1.0 X-stable: commit X-Patchwork-Hint: ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190514_101149_759756_8ABBC8B4 X-CRM114-Status: GOOD ( 15.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: stable-commits@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is a note to let you know that I've just added the patch titled [PATCH 25/30] powerpc/speculation: Support 'mitigations=' cmdline to the 4.19-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: 0025-powerpc-speculation-Support-mitigations-cmdline-opti.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From 1caa66c02b21ad771c6bfa38327c68ba308a633d Mon Sep 17 00:00:00 2001 From: Josh Poimboeuf Date: Fri, 12 Apr 2019 15:39:30 -0500 Subject: [PATCH 25/30] powerpc/speculation: Support 'mitigations=' cmdline option commit 782e69efb3dfed6e8360bc612e8c7827a901a8f9 upstream Configure powerpc CPU runtime speculation bug mitigations in accordance with the 'mitigations=' cmdline option. This affects Meltdown, Spectre v1, Spectre v2, and Speculative Store Bypass. The default behavior is unchanged. Signed-off-by: Josh Poimboeuf Signed-off-by: Thomas Gleixner Tested-by: Jiri Kosina (on x86) Reviewed-by: Jiri Kosina Cc: Borislav Petkov Cc: "H . Peter Anvin" Cc: Andy Lutomirski Cc: Peter Zijlstra Cc: Jiri Kosina Cc: Waiman Long Cc: Andrea Arcangeli Cc: Jon Masters Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: linux-s390@vger.kernel.org Cc: Catalin Marinas Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: linux-arch@vger.kernel.org Cc: Greg Kroah-Hartman Cc: Tyler Hicks Cc: Linus Torvalds Cc: Randy Dunlap Cc: Steven Price Cc: Phil Auld Link: https://lkml.kernel.org/r/245a606e1a42a558a310220312d9b6adb9159df6.1555085500.git.jpoimboe@redhat.com Signed-off-by: Greg Kroah-Hartman --- Documentation/admin-guide/kernel-parameters.txt | 9 +++++---- arch/powerpc/kernel/security.c | 6 +++--- arch/powerpc/kernel/setup_64.c | 2 +- 3 files changed, 9 insertions(+), 8 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 31c17532c219..49aa191979c1 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2503,7 +2503,7 @@ http://repo.or.cz/w/linux-2.6/mini2440.git mitigations= - [X86] Control optional mitigations for CPU + [X86,PPC] 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. @@ -2512,10 +2512,11 @@ Disable all optional CPU mitigations. This improves system performance, but it may also expose users to several CPU vulnerabilities. - Equivalent to: nopti [X86] - nospectre_v2 [X86] + Equivalent to: nopti [X86,PPC] + nospectre_v1 [PPC] + nospectre_v2 [X86,PPC] spectre_v2_user=off [X86] - spec_store_bypass_disable=off [X86] + spec_store_bypass_disable=off [X86,PPC] l1tf=off [X86] auto (default) diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c index 1341325599a7..4ccbf611a3c5 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -56,7 +56,7 @@ void setup_barrier_nospec(void) enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR); - if (!no_nospec) + if (!no_nospec && !cpu_mitigations_off()) enable_barrier_nospec(enable); } @@ -115,7 +115,7 @@ static int __init handle_nospectre_v2(char *p) early_param("nospectre_v2", handle_nospectre_v2); void setup_spectre_v2(void) { - if (no_spectrev2) + if (no_spectrev2 || cpu_mitigations_off()) do_btb_flush_fixups(); else btb_flush_enabled = true; @@ -299,7 +299,7 @@ void setup_stf_barrier(void) stf_enabled_flush_types = type; - if (!no_stf_barrier) + if (!no_stf_barrier && !cpu_mitigations_off()) stf_barrier_enable(enable); } diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index faf00222b324..eaf7300be5ab 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -955,7 +955,7 @@ void setup_rfi_flush(enum l1d_flush_type types, bool enable) enabled_flush_types = types; - if (!no_rfi_flush) + if (!no_rfi_flush && !cpu_mitigations_off()) rfi_flush_enable(enable); } -- 2.21.0 Patches currently in stable-queue which might be from jpoimboe@redhat.com are queue-4.19/0025-powerpc-speculation-Support-mitigations-cmdline-opti.patch queue-4.19/0022-x86-speculation-mds-Print-SMT-vulnerable-on-MSBDS-wi.patch queue-4.19/0024-x86-speculation-Support-mitigations-cmdline-option.patch queue-4.19/0023-cpu-speculation-Add-mitigations-cmdline-option.patch queue-4.19/0018-x86-speculation-mds-Add-mds-full-nosmt-cmdline-optio.patch queue-4.19/0030-x86-speculation-mds-Fix-documentation-typo.patch queue-4.19/0027-x86-speculation-mds-Add-mitigations-support-for-MDS.patch queue-4.19/0020-x86-speculation-mds-Add-SMT-warning-message.patch queue-4.19/0001-Documentation-l1tf-Fix-small-spelling-typo.patch queue-4.19/0019-x86-speculation-Move-arch_smt_update-call-to-after-m.patch queue-4.19/0026-s390-speculation-Support-mitigations-cmdline-option.patch queue-4.19/0021-x86-speculation-mds-Fix-comment.patch _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel