From patchwork Wed Feb 26 18:05:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 11406941 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 886F314B4 for ; Wed, 26 Feb 2020 18:07:56 +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 4759624650 for ; Wed, 26 Feb 2020 18:07:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="RW6+kY+F" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4759624650 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=YYckhrdowN/EqxJYy96Hbku6m078DyWObIyAJ7qiCsE=; b=RW6+kY+FmpcsrV idP+FbqzqhCqYyhVb/pGf7j05J4G6aWb6h6cmjiVAtQIFpMo8f7+wEnWw6313HYXQu4/VzLp3i4fB /I9kiGZaX1lRBnqDCwsCejUo3eLtyyjrX+Fkgir+7QuAISkdWp2inEpDWXn3c6Viuy9rB1KAkSfL+ nJ5H7BR76IDyMHCJ8x4oE0FDltf8qUA0TwUAWWhBUTRQTym5aNIxZwHvTUiDGKGtOyZASdgih224N 2S7NEbo2fXXOyCxtJU+uDHyq6eGeYw9tehxpBit52Qe369TIhdaUv7xv1G8sV36heaBBY7vHmh9LE rPi7vQOrWuSi/zUsp09Q==; 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 1j7169-0000dr-MQ; Wed, 26 Feb 2020 18:07:53 +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 1j7148-0007GI-2s for linux-arm-kernel@lists.infradead.org; Wed, 26 Feb 2020 18:05:50 +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 C8E5030E; Wed, 26 Feb 2020 10:05:47 -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 571993F881; Wed, 26 Feb 2020 10:05:46 -0800 (PST) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 07/19] arm64: mte: Tags-aware copy_page() implementation Date: Wed, 26 Feb 2020 18:05:14 +0000 Message-Id: <20200226180526.3272848-8-catalin.marinas@arm.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200226180526.3272848-1-catalin.marinas@arm.com> References: <20200226180526.3272848-1-catalin.marinas@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200226_100548_186060_8157911C X-CRM114-Status: UNSURE ( 8.19 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.3 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_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 , 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 preserved across page copy (e.g. for copy-on-write). Introduce MTE-aware copy_page() which preserves the tags across page copy. Signed-off-by: Vincenzo Frascino Co-developed-by: Catalin Marinas Signed-off-by: Catalin Marinas --- arch/arm64/lib/copy_page.S | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S index e7a793961408..c3234175efe0 100644 --- a/arch/arm64/lib/copy_page.S +++ b/arch/arm64/lib/copy_page.S @@ -25,6 +25,29 @@ alternative_if ARM64_HAS_NO_HW_PREFETCH prfm pldl1strm, [x1, #384] alternative_else_nop_endif +#ifdef CONFIG_ARM64_MTE +alternative_if_not ARM64_MTE + b 2f +alternative_else_nop_endif + /* + * Copy tags if MTE has been enabled. + */ + mov x2, x0 + mov x3, x1 + + multitag_transfer_size x7, x5 +1: + ldgm x4, [x3] + stgm x4, [x2] + + add x2, x2, x7 + add x3, x3, x7 + + tst x2, #(PAGE_SIZE - 1) + b.ne 1b +2: +#endif + ldp x2, x3, [x1] ldp x4, x5, [x1, #16] ldp x6, x7, [x1, #32]