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=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=no 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 2F85AC5518B for ; Wed, 22 Apr 2020 14:25:51 +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 056B920787 for ; Wed, 22 Apr 2020 14:25:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="iWPj95Gw" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 056B920787 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: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:In-Reply-To:References: List-Owner; bh=bR4qEEIVWOSEo6wvAYicGzc5SmdwezTox1tCt6hqGhs=; b=iWPj95GwnujTGT 9szFBUs8YMUaWlkgC/7ERgi1svAsTRUo8W0/B022M6D6xRdFFoU7XjUEH1Qm07yId6QHjc7pdSAev Su614oMT26PpGHpYdYu4SZE5EZsw7fT9zG3xEtQ8sgoqn9L4Un1pX+363oABLxxnv2wvlShfe87UU HSWUeKuZqp1EDLTpbAm3II041xJnIZqw1xICQvvSKD7e+4SF0DmGAg/4yR9wyaNjY0w2rO075uBIa rEcPxDmIRHpW64PDpVbXeIh7rALLWPHNN8Jd/s33h0cVZw4jGtzZNEuf1X6NDEommhDGg/hMcST8r JpX5wzp3W8RXlVSyGLCQ==; 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 1jRGJu-0000dX-KF; Wed, 22 Apr 2020 14:25:46 +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 1jRGJq-0000bu-53 for linux-arm-kernel@lists.infradead.org; Wed, 22 Apr 2020 14:25:44 +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 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 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200422_072543_023886_7E1DC241 X-CRM114-Status: GOOD ( 11.59 ) 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, Arnd Bergmann , Catalin Marinas , Hugh Dickins , Steven Price , Andrew Morton , 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 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 -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel