From patchwork Mon Jun 11 12:53:26 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Diana Craciun X-Patchwork-Id: 927651 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 414Cfm2lSPz9s01 for ; Mon, 11 Jun 2018 22:55:28 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=nxp.com Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 414Cfl5NJlzF0pl for ; Mon, 11 Jun 2018 22:55:27 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=nxp.com X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nxp.com (client-ip=92.121.34.13; helo=inva020.nxp.com; envelope-from=diana.craciun@nxp.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=nxp.com Received: from inva020.nxp.com (inva020.nxp.com [92.121.34.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 414Ccd5hfSzF3c1 for ; Mon, 11 Jun 2018 22:53:36 +1000 (AEST) Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id E5CAC1A0174; Mon, 11 Jun 2018 14:53:32 +0200 (CEST) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id D9FCF1A0170; Mon, 11 Jun 2018 14:53:32 +0200 (CEST) Received: from fsr-ub1664-009.ea.freescale.net (fsr-ub1664-009.ea.freescale.net [10.171.71.77]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id 891FE20621; Mon, 11 Jun 2018 14:53:32 +0200 (CEST) From: Diana Craciun To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 1/3] powerpc/fsl: Disable the speculation barrier from the command line Date: Mon, 11 Jun 2018 15:53:26 +0300 Message-Id: <1528721608-15443-2-git-send-email-diana.craciun@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1528721608-15443-1-git-send-email-diana.craciun@nxp.com> References: <1528721608-15443-1-git-send-email-diana.craciun@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: oss@buserror.net, Diana Craciun , bharat.bhushan@nxp.com, leoyang.li@nxp.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" The speculation barrier can be disabled from the command line with the parameter: "nospectre_v1". Signed-off-by: Diana Craciun --- arch/powerpc/kernel/security.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c index 3eb9c45..c55e102 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -16,6 +16,7 @@ unsigned long powerpc_security_features __read_mostly = SEC_FTR_DEFAULT; bool barrier_nospec_enabled; +static bool no_nospec; static void enable_barrier_nospec(bool enable) { @@ -42,9 +43,18 @@ void setup_barrier_nospec(void) enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR); - enable_barrier_nospec(enable); + if (!no_nospec) + enable_barrier_nospec(enable); } +static int __init handle_nospectre_v1(char *p) +{ + no_nospec = true; + + return 0; +} +early_param("nospectre_v1", handle_nospectre_v1); + #ifdef CONFIG_DEBUG_FS static int barrier_nospec_set(void *data, u64 val) {