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=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham 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 4F7C5C33CB1 for ; Wed, 15 Jan 2020 14:29:28 +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 1EB67214AF for ; Wed, 15 Jan 2020 14:29:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="q4/siAbT"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="O8eX09fy" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1EB67214AF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.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:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: 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: List-Owner; bh=ty1f0x+69WCZVuQs0S6xHvbZGXWcxBP003NkyU1C4Wo=; b=q4/siAbTGgrATp KDDvCnwC/pjEjsuuCovWyaDyJuMyPUCFdyD4juzwYKR4LoMtX7zAkDU6/rTrVfuk3qV/RmgX1U4XT GbjfxUu+0h9IxgGbWP/BeOgsih25/CGgT6KoDXJm9prTrBpxZobUjBD342UgvNKPzNN3pWPwyaKog a+HnZGD5V7uFivd98NyjsZZ2bAOId3ayKqc/ecFY0cKVeVBOBvfHNXDNsexBCUUB8iKmnvX/hujKS 5NFwwMu8z/YxzVwZDOXyc75Rp5ikB87op/AItztBwj8c3EvbglRbrlL8/NZ974I/oeEbTf6VbUDOs fqCwYWoPLmFF1DcwECUA==; 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 1irjff-0007hw-UN; Wed, 15 Jan 2020 14:29:23 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1irjfR-0007XH-94 for linux-arm-kernel@lists.infradead.org; Wed, 15 Jan 2020 14:29:10 +0000 Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BC3822467A; Wed, 15 Jan 2020 14:29:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579098549; bh=NS+WkmkBqm1jKci5W7p0yqlGhR7MP0lFDwITqyj1vGg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O8eX09fyKL8fleo5NiMVXHEfcQF5aMiCXeyoO71YuRAuiJoA6DVIVyyWTI0VIXOw4 B3PRt0nuNOU/W7xj9saE7uzwi08pgAT7qV05zebkihfwdf0uWnn0x0qePLViBSpMm5 RosTy+zhIpaDyQzXhrVNofOKm2YlwrkfnlxbW0VQ= From: Will Deacon To: broonie@kernel.org Subject: [PATCH 1/2] arm64: Simplify early check for broken TX1 when KASLR is enabled Date: Wed, 15 Jan 2020 14:28:59 +0000 Message-Id: <20200115142900.28976-2-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200115142900.28976-1-will@kernel.org> References: <20200115142900.28976-1-will@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200115_062909_333890_5D431DCA X-CRM114-Status: GOOD ( 13.90 ) 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: kernel-team@android.com, Suzuki K Poulose , Marc Zyngier , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Now that the decision to use non-global mappings is stored in a variable, the check to avoid enabling them for the terminally broken ThunderX1 platform can be simplified so that it is only keyed off the MIDR value. Signed-off-by: Will Deacon --- arch/arm64/kernel/cpufeature.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 4a031111ceb5..d5242b44dc5a 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -980,9 +980,7 @@ has_useable_cnp(const struct arm64_cpu_capabilities *entry, int scope) */ bool kaslr_requires_kpti(void) { - bool tx1_bug; u64 ftr; - if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE)) return false; @@ -1000,18 +998,13 @@ bool kaslr_requires_kpti(void) * Systems affected by Cavium erratum 24756 are incompatible * with KPTI. */ - if (!IS_ENABLED(CONFIG_CAVIUM_ERRATUM_27456)) { - tx1_bug = false; - } else if (!static_branch_likely(&arm64_const_caps_ready)) { + if (IS_ENABLED(CONFIG_CAVIUM_ERRATUM_27456)) { extern const struct midr_range cavium_erratum_27456_cpus[]; - tx1_bug = is_midr_in_range_list(read_cpuid_id(), - cavium_erratum_27456_cpus); - } else { - tx1_bug = __cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_27456); + if (is_midr_in_range_list(read_cpuid_id(), + cavium_erratum_27456_cpus)) + return false; } - if (tx1_bug) - return false; return kaslr_offset() > 0; } -- 2.25.0.rc1.283.g88dfdc4193-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel