From patchwork Thu Oct 3 15:51:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 175101 Delivered-To: patch@linaro.org Received: by 2002:a92:7e96:0:0:0:0:0 with SMTP id q22csp528014ill; Thu, 3 Oct 2019 09:09:04 -0700 (PDT) X-Google-Smtp-Source: APXvYqyuKQd6hQ3TO4NLF5VOnsbNs1836WEvzywgpQfGRxXtF/4mK9drIZ3Oum785us5Wl/+WiaS X-Received: by 2002:a17:907:411d:: with SMTP id nw21mr8231021ejb.8.1570118812985; Thu, 03 Oct 2019 09:06:52 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1570118812; cv=none; d=google.com; s=arc-20160816; b=x36fNwBZciy/V4u9ivYfPiPSIMkRmyBY200XwAQd4cG80QgZHMAYnoHNYYV14szpFd Z6DscVkdyq5WxBUNWv/iZ3+vsVBk/KIeB2zzUYy0Rw1TJeDzXv0BbupHN4jh53fEtEpI SkuzE0aat6BDqJJCBaYKuRenIHHoLGJqwSHBLYG5AAm2yxXsOQ+l7jOTXzbWCmQXRvFT XOzqttT4I//+Lxf0M4+WvKmcqizXav/c63Da63VEBqmCXbivR+INNM6R5gbWawYlbW63 Ui97ScOAEFNNxdjEXVO+FIMTSSlob6Y+xyI+M2HoqXr53cIpPk9Ma026KBDoePerMPqi FsXQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=NCJzVWiFrrjV0qmVUbCYk0qoM5YkKiN80l6PyyKbPkQ=; b=V/i0uNDfawVvUv20VpyHDKVvWyDdn1GkTr8J0yV+mNNNhNz51PEKTHoViWjD6W1BcL B5kt6C0y7Sscz2tWcUS2f+8JvchYjqiGsLa6WWdnbNfIVmo2TM/Dn5cvZ3ekwBdfmgyN 75hRN9RtpKMXC2Z+Lb0ImabbdetYYMGwTpUEwy8FDyyzaN98dNj6tlm0Um87YhG01h/G RVTLCEnkpm5lHXUMVB78Vr/bqv/ltAr4pjnYrBedyDsWm0wjnbZujFOh1RkEIKOFX3RT DhfNvb3RYeyivfLVZnOWlIc9f3qjjKUOS4HlSh24OsgwxtRO2dLKUkaYdv/xZIa1/TKQ s//Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=ATwvV+Hl; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id k6si1512117ejc.399.2019.10.03.09.06.52; Thu, 03 Oct 2019 09:06:52 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=ATwvV+Hl; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732806AbfJCQGm (ORCPT + 27 others); 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 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; }