From patchwork Tue Apr 21 14:25:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 11501619 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 E6C16913 for ; Tue, 21 Apr 2020 14:28:39 +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 98AD2206D9 for ; Tue, 21 Apr 2020 14:28:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ApBLSJNT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 98AD2206D9 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=msC4Vy9/DFuJ7xTaCIIR/r1H9ItevGIczmpvSElk7pw=; b=ApBLSJNTOHZjB2 SL/7eamdXY6C1a07evZl04Rzw0K+xDcKNI0VvDdV1Cag9WgQYS10dyglUzEDwd4iERMNKoV6XKL5J SMd33GpbCs2bZh452d/J8o2a5mSdgvptYCXxc84DstZ8I677XWYnKzmeWgoenfMk+unzujotQzSyG W7S4eLjTHrrZePrHoWzlopUMNGWQRDMliDhgpTbgd9UDQ6T8RqNsOvzcrGAiqwkt+K94HlNldB6nC BHLUyOC8SmGlR5K1hxj+7WJHFECy5qevELOADtRyl/E7z8BFmSx+qubLs/IqjI/83ywhMBBWjzorh myrECk+OTHRLYldNyQ5w==; 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 1jQtt8-0001fr-31; Tue, 21 Apr 2020 14:28:38 +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 1jQtqy-0008D6-To for linux-arm-kernel@lists.infradead.org; Tue, 21 Apr 2020 14:26:26 +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 2F53731B; Tue, 21 Apr 2020 07:26:24 -0700 (PDT) Received: from localhost.localdomain (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 885653F68F; Tue, 21 Apr 2020 07:26:22 -0700 (PDT) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 07/23] arm64: mte: Tags-aware copy_page() implementation Date: Tue, 21 Apr 2020 15:25:47 +0100 Message-Id: <20200421142603.3894-8-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_072625_014490_CD7C7DD2 X-CRM114-Status: UNSURE ( 8.84 ) X-CRM114-Notice: Please train this message. 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 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 Cc: Will Deacon --- 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]