From patchwork Tue Apr 21 14:25:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 11501615 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 6F5741575 for ; Tue, 21 Apr 2020 14:28:10 +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 F130B206D9 for ; Tue, 21 Apr 2020 14:28:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="oKldOPXB" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F130B206D9 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=yVQYF8taY/DpXXTooK10V/QgF5mnog8EkQhztHd/RGU=; b=oKldOPXBQyOo+a Yx6bKF1Rg06pEUOl6wdqjUokBbc7TT6hDWn1L3WR8LzH28JqE0q6ZZzyBsZfXB9GKVZ0Lu7PxKO/6 Z7rUCr/HdA0Gzwi3UA+4WMNkKDwD+wpYbZl5uHeYM909WUlE0VRnZPJAVV+XfZvMabkOcIoOS4V7x PB2vvrp95fJ7Z+UQaSODht5KbjonTdAs+jrqJbVLLs6x2Qtiq+lCfAp4cA+8Z/ASdk1L+wCP4XSYg Ub+LbaOLuejxb5SnOfx8BQyRKkxYkR6NiaazDSg71w9vAoUxn+2xdjtAL3gq2/VVn9evcZMRzCS/R 2MdFhv5TrBqil3czj2Ew==; 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 1jQtsX-0001Bt-9p; Tue, 21 Apr 2020 14:28:01 +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 1jQtqw-00086e-Ig for linux-arm-kernel@lists.infradead.org; Tue, 21 Apr 2020 14:26:24 +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 53DF3C14; Tue, 21 Apr 2020 07:26:22 -0700 (PDT) Received: from localhost.localdomain (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id BBE6A3F68F; Tue, 21 Apr 2020 07:26:20 -0700 (PDT) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 06/23] arm64: mte: Tags-aware clear_page() implementation Date: Tue, 21 Apr 2020 15:25:46 +0100 Message-Id: <20200421142603.3894-7-catalin.marinas@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200421142603.3894-1-catalin.marinas@arm.com> References: <20200421142603.3894-1-catalin.marinas@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200421_072622_682761_041270F9 X-CRM114-Status: GOOD ( 10.25 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [217.140.110.172 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an 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 , Andrey Konovalov , Kevin Brodsky , Peter Collingbourne , linux-mm@kvack.org, 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 Cc: Will Deacon --- 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 073acbf02a7c..9f85a4cf9568 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 @@ SYM_FUNC_START(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