From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4FDDAC32792 for ; Thu, 3 Oct 2019 16:06:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1077B21783 for ; Thu, 3 Oct 2019 16:06:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118803; bh=Qr5EGmTQNR2o9tv56lUO1BpJvOjnhnOrG5GY8KDWsgs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pEjGqROyL0hae2taztQ0NV3C+F42MI5xfTMsiwuMQkNVnDUZZbT9XNZOTS2Yc2cDK BDCsT75OglhmADMEffL/rNy5cGSbueaBz4jSlmnDgWjakaTfBN6rgaiytHPF/Ob53t 95wc8W2DvSOfRMW+3sIH1KezqwOaDvYsrqTZ/GXI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732806AbfJCQGm (ORCPT ); Thu, 3 Oct 2019 12:06:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:54044 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732795AbfJCQGj (ORCPT ); Thu, 3 Oct 2019 12:06:39 -0400 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 95A61207FF; Thu, 3 Oct 2019 16:06:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118799; bh=Qr5EGmTQNR2o9tv56lUO1BpJvOjnhnOrG5GY8KDWsgs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ATwvV+HlCSUsS7q7ijz59TBANNbs/9zOj70LpwSyB6qbt5aXF4w+H4NKHm5LDKRpQ dgtMXjDXCbtCkS6lUytRstV3HrBK32dH1BwjyeJTk4MMaAZ11Uc+owrzKWRxH/NrIG lW/zE8K+IBYFVbQFZd7cM+O+q0H1cve3bcvRQDNY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Will Deacon , Niklas Cassel Subject: [PATCH 4.14 014/185] arm64: kpti: Whitelist Cortex-A CPUs that dont implement the CSV3 field Date: Thu, 3 Oct 2019 17:51:32 +0200 Message-Id: <20191003154440.681273301@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154437.541662648@linuxfoundation.org> References: <20191003154437.541662648@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Will Deacon commit 2a355ec25729053bb9a1a89b6c1d1cdd6c3b3fb1 upstream. While the CSV3 field of the ID_AA64_PFR0 CPU ID register can be checked to see if a CPU is susceptible to Meltdown and therefore requires kpti to be enabled, existing CPUs do not implement this field. We therefore whitelist all unaffected Cortex-A CPUs that do not implement the CSV3 field. Signed-off-by: Will Deacon Signed-off-by: Niklas Cassel Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/cpufeature.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -838,6 +838,11 @@ static bool unmap_kernel_at_el0(const st switch (read_cpuid_id() & MIDR_CPU_MODEL_MASK) { case MIDR_CAVIUM_THUNDERX2: case MIDR_BRCM_VULCAN: + case MIDR_CORTEX_A53: + case MIDR_CORTEX_A55: + case MIDR_CORTEX_A57: + case MIDR_CORTEX_A72: + case MIDR_CORTEX_A73: return false; }