From patchwork Wed Apr 22 14:25:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 11503975 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 82DB814DD for ; Wed, 22 Apr 2020 14:25:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 598492076E for ; Wed, 22 Apr 2020 14:25:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 598492076E 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 508378E0028; Wed, 22 Apr 2020 10:25:43 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 491C48E0003; Wed, 22 Apr 2020 10:25:43 -0400 (EDT) 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 359188E0028; Wed, 22 Apr 2020 10:25:43 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0165.hostedemail.com [216.40.44.165]) by kanga.kvack.org (Postfix) with ESMTP id 19E558E0003 for ; Wed, 22 Apr 2020 10:25:43 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id CF9DE180AD806 for ; Wed, 22 Apr 2020 14:25:42 +0000 (UTC) X-FDA: 76735714524.02.waste72_4eeeea74f7314 X-Spam-Summary: 2,0,0,a1202845cb459ee3,d41d8cd98f00b204,steven.price@arm.com,,RULES_HIT:41:355:379:541:800:967:973:981:988:989:1260:1261:1311:1314:1345:1437:1515:1534:1541:1711:1730:1747:1777:1792:1801:1981:2194:2199:2393:2525:2553:2559:2563:2682:2685:2730:2859:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3353:3865:3866:3867:3868:3870:3871:3872:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4250:4321:4605:5007:6261:7903:8634:9025:10004:11026:11658:11914:12043:12291:12297:12517:12519:12555:12679:12683:12895:12986:13069:13311:13357:13894:14096:14181:14384:14394:14581:14721:21080:21220:21325:21451:21627:21795:21811:30051:30054:30055:30069:30090,0,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:24,LUA_SUMMARY:none X-HE-Tag: waste72_4eeeea74f7314 X-Filterd-Recvd-Size: 3092 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf28.hostedemail.com (Postfix) with ESMTP for ; Wed, 22 Apr 2020 14:25:42 +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 5028E30E; Wed, 22 Apr 2020 07:25:41 -0700 (PDT) Received: from e112269-lin.arm.com (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D8D333F68F; Wed, 22 Apr 2020 07:25:39 -0700 (PDT) From: Steven Price To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Cc: Steven Price , linux-arch@vger.kernel.org, Andrew Morton , Arnd Bergmann , Catalin Marinas , Hugh Dickins , Vincenzo Frascino , Will Deacon Subject: [PATCH 0/4] arm64: MTE swap and hibernation support Date: Wed, 22 Apr 2020 15:25:26 +0100 Message-Id: <20200422142530.32619-1-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 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: This adds support for swapping and hibernation with MTE tagged memory. It's based on Catalin's v3 series[1]. To support swap, a new page flag is added which tracks whether a page has been mapped into user space with MTE enabled (and therefore may have valid data in the tags). Arch hooks are added to enable the saving/restoring of these tags (in memory) when the pages are swapped out. Hibernation builds on the swap support by simply copying the tags out of hardware tag storage into normal memory before the hibernation image is created. On restore the tags are returned to the hardware tag storage. Feedback on the approach is welcomed. [1] https://lore.kernel.org/linux-arm-kernel/20200421142603.3894-1-catalin.marinas@arm.com/ Steven Price (4): mm: Add PG_ARCH_2 page flag mm: Add arch hooks for saving/restoring tags arm64: mte: Enable swap of tagged pages arm64: mte: Save tags when hibernating arch/arm64/Kconfig | 2 +- arch/arm64/include/asm/mte.h | 6 ++ arch/arm64/include/asm/pgtable.h | 44 ++++++++++++ arch/arm64/kernel/hibernate.c | 116 ++++++++++++++++++++++++++++++ arch/arm64/lib/mte.S | 50 +++++++++++++ arch/arm64/mm/Makefile | 2 +- arch/arm64/mm/mteswap.c | 98 +++++++++++++++++++++++++ fs/proc/page.c | 3 + include/asm-generic/pgtable.h | 23 ++++++ include/linux/kernel-page-flags.h | 1 + include/linux/page-flags.h | 3 + include/trace/events/mmflags.h | 9 ++- mm/Kconfig | 3 + mm/page_io.c | 6 ++ mm/shmem.c | 6 ++ mm/swapfile.c | 2 + tools/vm/page-types.c | 2 + 17 files changed, 373 insertions(+), 3 deletions(-) create mode 100644 arch/arm64/mm/mteswap.c