From patchwork Fri Jan 24 20:08:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Fainelli X-Patchwork-Id: 11350883 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CDE7713A4 for ; Fri, 24 Jan 2020 20:08:42 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A4EA92071E for ; Fri, 24 Jan 2020 20:08:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="dQAnjGDU"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="j5++EJNQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A4EA92071E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Owner; bh=cDVVME4gJvH2TK8MBzUV4qL//R12bdM3+/XpCa9+Tgg=; b=dQA njGDUY4KtKFtt6AJATuU1/UTFCUq6ScFxzg4RL0jPw0qOKCiBzALND/1rWhX4unrGAURzL9Mc/XLG CxBEivFcmhJGnPs7ZdhNYUyzMrwN+JjwkIXKQUXlCcukRdeMFSJyaVW2mzB5A/7VAyEpFDnpzeHRB P5Q9Wf4Y/BT3Koakjx0Jz64KwdNtV5rr5/9YH3+qUDzGDA37IqdWje9oBGafSK3SuedtHwmIcgG+u kt9D88xpJtIRVeKfm50wk7vsy5DrA9hHayhp2/kSQ79HRuEMpCgN8A6q7DUMUNma1TpNTahEoYJaV 98gx5jsei9rJ/RhlZDwEHMHY9updILw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iv5Fs-0005l7-Tu; Fri, 24 Jan 2020 20:08:36 +0000 Received: from mail-pg1-x544.google.com ([2607:f8b0:4864:20::544]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iv5Fp-0005kh-7E for linux-arm-kernel@lists.infradead.org; Fri, 24 Jan 2020 20:08:35 +0000 Received: by mail-pg1-x544.google.com with SMTP id k25so1668458pgt.7 for ; Fri, 24 Jan 2020 12:08:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=6ErqDnPmvotTKNe1KfqwWHr2o3aJpwAhGPt+q+2RIGY=; b=j5++EJNQx/pjiInQRmR1C7PmvfNsiq2RQhNl8BaqnCPdx4a+wAFMN8wLG7w7bb9Vnz ZjnuJhqdGlB3TU/IZ6LRpAEbanmwIjkvON4qMIlxY93ay8RMdS3SXC+K9crIPyTc48x0 FHfk9xbI4rm9ZXqkp0/u7iGDyQvdrP/8MIbqWJ64ClmYb59cFFjuaIrKEcr2y7EDw4S2 V8m9by4tOdeJsC8pq+oNl/2B5FmbXTl+1zkjRpofaN7M1dVBK0T9k+jDy5hOKqAP6EPi 74O34mVEfi2AW+bEPmenVuKYw+KeHQkbVbqHMcIxi/rqLDdtQ2va5N/4NG7PIGcyNuNJ q7qw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=6ErqDnPmvotTKNe1KfqwWHr2o3aJpwAhGPt+q+2RIGY=; b=qY6jtYDaGGzqUFZurqmwyh2cp2Yq2iMxaK7uGtq+qhO6mZwo07eCX2Uerm1Wo96FSB cuHx/aIZCtsqqB52ocXglHSplUtzKz801tv4kWxFeh5DLD0w8R6GkFKm87hlVw5Z98sL IifXjvA0N8vnY+/6njjG2blkrN077L53U7VqkBP0i2laI6J2Az3qH/rBZO1+gnZB6pFl WjLpQ48DzMmi+FOjUgyUNjYUIxteaKQt2Q5r0hdj/eYdIDpNE0h4Xqp48FFwMr7QhU2e +nCbcV691kKoORxitTr9HV1ds1Zd6J5rCmTIXxPREvBW0XGzWlmnHmWA5icZvFaWU8Lk 4g4A== X-Gm-Message-State: APjAAAUZKvTPQyBHdSfs1pd56htpoquqPH/AuPybuYrGxW3M6jnJDbFy +4w4++5KsqlcNDBsiwDJZcDHpyVL X-Google-Smtp-Source: APXvYqyDX71JE8oPFq73PkIkrg9qSc6xt8FGKqhatmzDASLi9r0401eu++SsDf608mt+iTH/hcz4gg== X-Received: by 2002:a63:5a23:: with SMTP id o35mr5912160pgb.4.1579896511412; Fri, 24 Jan 2020 12:08:31 -0800 (PST) Received: from fainelli-desktop.igp.broadcom.net ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id j38sm7363809pgj.27.2020.01.24.12.08.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Jan 2020 12:08:29 -0800 (PST) From: Florian Fainelli To: linux-arm-kernel@lists.infradead.org Subject: [PATCH stable 4.9] arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field Date: Fri, 24 Jan 2020 12:08:20 -0800 Message-Id: <20200124200820.18272-1-f.fainelli@gmail.com> X-Mailer: git-send-email 2.17.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200124_120833_289167_C543759B X-CRM114-Status: UNSURE ( 9.63 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:544 listed in] [list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider [f.fainelli[at]gmail.com] -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: sashal@kernel.org, Florian Fainelli , Suzuki K Poulose , gregkh@linuxfoundation.org, Will Deacon , open list , stable@vger.kernel.org, Catalin Marinas , will@kernel.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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 [florian: adjust whilelist location and table to stable-4.9.y] Signed-off-by: Florian Fainelli --- arch/arm64/kernel/cpufeature.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 9a8e45dc36bd..8cf001baee21 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -789,6 +789,11 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, 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; }