From patchwork Wed Dec 11 18:40:15 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 11286007 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 CA6F1109A for ; Wed, 11 Dec 2019 18:48:55 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A26A8206A5 for ; Wed, 11 Dec 2019 18:48:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A26A8206A5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D56A16B3368; Wed, 11 Dec 2019 13:48:51 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id A8FE06B3364; Wed, 11 Dec 2019 13:48:51 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 92AF96B3366; Wed, 11 Dec 2019 13:48:51 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0111.hostedemail.com [216.40.44.111]) by kanga.kvack.org (Postfix) with ESMTP id 76C606B3364 for ; Wed, 11 Dec 2019 13:48:51 -0500 (EST) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 40355180AD81F for ; Wed, 11 Dec 2019 18:48:51 +0000 (UTC) X-FDA: 76253747262.24.roll48_130221ee85848 X-Spam-Summary: 2,0,0,bc14bb2b0318214e,d41d8cd98f00b204,catalin.marinas@arm.com,:linux-arm-kernel@lists.infradead.org:will@kernel.org:maz@kernel.org:vincenzo.frascino@arm.com:szabolcs.nagy@arm.com:richard.earnshaw@arm.com:kevin.brodsky@arm.com:andreyknvl@google.com::linux-arch@vger.kernel.org,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1261:1311:1314:1345:1359:1437:1515:1534:1541:1711:1730:1747:1777:1792:2393:2559:2562:3138:3139:3140:3141:3142:3352:3865:3867:3871:4250:4321:5007:6117:6119:6261:7576:8634:10004:11026:11473:11658:11914:12291:12297:12438:12555:12679:13069:13311:13357:13894:14181:14384:14394:14721:21080:21230:21451:21627:30054:30079,0,RBL:217.140.110.172:@arm.com:.lbl8.mailshell.net-62.2.0.100 64.100.201.201,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:29,LUA_SUMMARY:none X-HE-Tag: roll48_130221ee85848 X-Filterd-Recvd-Size: 2644 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Wed, 11 Dec 2019 18:48:50 +0000 (UTC) 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 46349143B; Wed, 11 Dec 2019 10:40:54 -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 C8DE03F6CF; Wed, 11 Dec 2019 10:40:52 -0800 (PST) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Cc: Will Deacon , Marc Zyngier , Vincenzo Frascino , Szabolcs Nagy , Richard Earnshaw , Kevin Brodsky , Andrey Konovalov , linux-mm@kvack.org, linux-arch@vger.kernel.org Subject: [PATCH 10/22] arm64: mte: Tags-aware copy_page() implementation Date: Wed, 11 Dec 2019 18:40:15 +0000 Message-Id: <20191211184027.20130-11-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-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 bbb8562396af..970b7a20da70 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]