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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 29A02C54FC9 for ; Tue, 21 Apr 2020 14:28:07 +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 A9B59206B9 for ; Tue, 21 Apr 2020 14:28:05 +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 A9B59206B9 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+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=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-Lt; 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-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 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 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel