From patchwork Wed Dec 11 18:40:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 11285953 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 A730714B7 for ; Wed, 11 Dec 2019 18:43:42 +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 5754C20663 for ; Wed, 11 Dec 2019 18:43:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="DUrAThUq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5754C20663 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.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: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=VAZ9sn4TCEWSr928VDJW6vYmjWbrT0oClprNJxeQIGQ=; b=DUrAThUqPpXHRi ls3booHMNqlamdKTNQLN8fKYxJdGrLbZ+y+scCnKU7Yn6U3cdobgdOrqRKGjdklPBUAbVAUJpAYys A2gVKH90H2/MQwiEpuRMPRt410fJGt1cgfHSHKPx+bnXBh4K0luNjxefJncwIFsKojAAbw99jOphV a0wEtP8tPMUqAaFmZBWBFWpKUUEVnzd4zUt2iL5IAOxX3KIpa3bXO36KcpUrRPm0yG7mqNXmwlwXD JSH/H88BdFQVkXyY8U1RkHlM6dMNis1f4YfvsiOghqzh5Hu6ufyXzC3FuABlK6rJ/B+mScGYYgE5a 1OxDB8pmrFp++rCR5ypQ==; 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 1if6xZ-0005sV-DE; Wed, 11 Dec 2019 18:43:41 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1if6ur-0003HM-0N for linux-arm-kernel@lists.infradead.org; Wed, 11 Dec 2019 18:40:55 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9467A1435; Wed, 11 Dec 2019 10:40:52 -0800 (PST) Received: from arrakis.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 218BA3F6CF; Wed, 11 Dec 2019 10:40:51 -0800 (PST) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 09/22] arm64: mte: Tags-aware clear_page() implementation Date: Wed, 11 Dec 2019 18:40:14 +0000 Message-Id: <20191211184027.20130-10-catalin.marinas@arm.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191211184027.20130-1-catalin.marinas@arm.com> References: <20191211184027.20130-1-catalin.marinas@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191211_104053_139806_579B08B7 X-CRM114-Status: UNSURE ( 9.52 ) X-CRM114-Notice: Please train this message. X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [217.140.110.172 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 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: linux-arch@vger.kernel.org, Richard Earnshaw , Szabolcs Nagy , Marc Zyngier , Kevin Brodsky , linux-mm@kvack.org, Andrey Konovalov , Vincenzo Frascino , Will Deacon Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Vincenzo Frascino When the Memory Tagging Extension is enabled, the tags need to be set to zero a page is cleared as they are visible to the user. Introduce an MTE-aware clear_page() which clears the tags in addition to data. Signed-off-by: Vincenzo Frascino Co-developed-by: Catalin Marinas Signed-off-by: Catalin Marinas --- arch/arm64/lib/clear_page.S | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/arm64/lib/clear_page.S b/arch/arm64/lib/clear_page.S index 78a9ef66288a..575cea03f68a 100644 --- a/arch/arm64/lib/clear_page.S +++ b/arch/arm64/lib/clear_page.S @@ -5,7 +5,9 @@ #include #include +#include #include +#include #include /* @@ -19,8 +21,9 @@ ENTRY(clear_page) and w1, w1, #0xf mov x2, #4 lsl x1, x2, x1 - -1: dc zva, x0 +1: +alternative_insn "dc zva, x0", "stzgm xzr, [x0]", \ + ARM64_MTE, IS_ENABLED(CONFIG_ARM64_MTE), 1 add x0, x0, x1 tst x0, #(PAGE_SIZE - 1) b.ne 1b