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,URIBL_BLOCKED,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 2E36BC3A5A6 for ; Thu, 19 Sep 2019 22:30:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 01B11208C0 for ; Thu, 19 Sep 2019 22:30:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568932259; bh=7MGaVN2wL64VImoAPcctyBsgIy7kwhtcTXeqnOhqXb4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=R4HszJVI4qp+7//v2SwU/4KfSR8wQnAL95rNTrI7SN/MPRnmg0z9MFONaa1vU6bXz C3e/OmCfKLKkfIrQO1X2USwWRajkgja8zrsjCSyLxRT92GDJmt/FvrKydHlJfxKC6e uHzXjtamiOcUhpnJQRrMGKG9Ov6tWNGfE0Anw9IE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403766AbfISWaw (ORCPT ); Thu, 19 Sep 2019 18:30:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:55370 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406126AbfISWP0 (ORCPT ); Thu, 19 Sep 2019 18:15:26 -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 AB659218AF; Thu, 19 Sep 2019 22:15:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568931326; bh=7MGaVN2wL64VImoAPcctyBsgIy7kwhtcTXeqnOhqXb4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LW9BVM7HUMFd6CwFwiALxgAcztryqeDxYe0mHBiiRJUX8L7dRSGDXCIoGdE0aGT3P crhpqjmyz+ZVAC0GC6EHAHcv9s1erohjTl0Fv/thhRsFapmTm2KkutHdEvEv730y3e nkKR3IAg061Swoumv9syvNQrPkWOQ4b4L5cu2Dc0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Will Deacon , Niklas Cassel Subject: [PATCH 4.19 78/79] arm64: kpti: Whitelist Cortex-A CPUs that dont implement the CSV3 field Date: Fri, 20 Sep 2019 00:04:03 +0200 Message-Id: <20190919214814.627750263@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190919214807.612593061@linuxfoundation.org> References: <20190919214807.612593061@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 Cc: Niklas Cassel Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/cpufeature.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -895,6 +895,12 @@ static bool unmap_kernel_at_el0(const st static const struct midr_range kpti_safe_list[] = { MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), { /* sentinel */ } }; char const *str = "command line option";