From patchwork Wed May 17 02:21:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Peter Collingbourne X-Patchwork-Id: 94999 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b0ea:0:b0:3b6:4342:cba0 with SMTP id b10csp830149vqo; Tue, 16 May 2023 19:28:06 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ52IFOVDP/pny4gchJwDF1058M62mufN9tW2iiiAYMsAy5rjS1glNvpjA25GZTsaQOZLXeW X-Received: by 2002:a05:6a20:7492:b0:100:b137:3563 with SMTP id p18-20020a056a20749200b00100b1373563mr35580010pzd.32.1684290486587; Tue, 16 May 2023 19:28:06 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1684290486; cv=none; d=google.com; s=arc-20160816; b=bnc3b+9+9vyEmPlgNHdgdtYyIp1Aw9fO2u9z00px30T3jkK3E17NLYycMPHpko2IPJ 0GE60Ixb2siogJGIHO7t1nVP9pFnzBludd6UJkwIIoghrq9WX2F39caDEU7BwkDPzSkX mM8fQhggEfHwS2AVG7np5ZqxOdMIIkv+3NCxgzdSLFqldRbzKXSfadU9bi2CGJe6zMvG Kk1rVy1+Qsl8wc4vWGE653B89zKPTthHqVIWhhaklblbrobP9C45dbtmZg57n0E9jKP9 N4K18Nrl6rA63lERvt8zjxgYHiSr4/Um8mc3wBhGwPoX1wzosk7dznqeLehNuqZxE/Lf w2AQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:cc:to:from:subject :references:mime-version:message-id:in-reply-to:date:dkim-signature; bh=icy+EhZ3UBgzX+LkBKZmwy9I7D5yLVOL3MyBuUnW0II=; b=di0s+mBZ9ET+szi6Ddll5tpFc7K4QB3pdcHNihlRyywCAW/RUpxZ7rXdDsMQsLLdR/ Hkq2AaGvRBQ40IlMS3S01f3A24BoWBgYAMwED1xHare8xdurbu3vTgmpsZK4J43nMlsQ oavC0NtPNEdGU705qXA+FAcuj2/EJ35DbpmspUjCmH1MEDvknTJmu2VYS7seelbM3iNI Yu5LhkxgiCk3h3D07s1Zl6g852c5U3euFWUJCfB473O5RL5/oJLhrVaN5YxbOgaS9sTo MP+PY4aLHx4FhC5YY9P25LQp95kOGc88rhG/sIVZUIj4P5DUy8rI120NFK3/wfHjzOWZ fRrg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20221208 header.b="kU3u/jVP"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id c19-20020a637253000000b0052c81b183a8si20446041pgn.385.2023.05.16.19.27.52; Tue, 16 May 2023 19:28:06 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20221208 header.b="kU3u/jVP"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231902AbjEQCVa (ORCPT + 99 others); Tue, 16 May 2023 22:21:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43432 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230176AbjEQCV1 (ORCPT ); Tue, 16 May 2023 22:21:27 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2E6BA171E for ; Tue, 16 May 2023 19:21:26 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-ba81b37d9d2so220670276.3 for ; Tue, 16 May 2023 19:21:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1684290085; x=1686882085; h=content-transfer-encoding:cc:to:from:subject:references :mime-version:message-id:in-reply-to:date:from:to:cc:subject:date :message-id:reply-to; bh=icy+EhZ3UBgzX+LkBKZmwy9I7D5yLVOL3MyBuUnW0II=; b=kU3u/jVPNbJOPkDSOv1M9xE9gA7eqoTFhSdZQD4qt7SNgcYJYLu77i/2peyYkaoM+E 1CklaeTAYSmTwv8Km5dGKi7C0WCfutgqDI2sGNHRkPp+sdYNdJ963Ikhl8N6lfTWY03r Jc0A1tNgoUDHR5FiwBDbsHV8XCGmQ1kAqZSfPSuC5DautA1wUknPrMKD4FBEPRXJM1cI zDV47+hqam9u7nttpZOONvGIAgOZpyS9w/3N1M0W8GoFsxZc0Tu51VmRu5U30nbsUdLv KRfdPlHe57ebRvFOgibo1B8s53lcdE03PGn3ebRw8zfKd/8XLAR3q4VID38yQeldPd39 cHzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684290085; x=1686882085; h=content-transfer-encoding:cc:to:from:subject:references :mime-version:message-id:in-reply-to:date:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=icy+EhZ3UBgzX+LkBKZmwy9I7D5yLVOL3MyBuUnW0II=; b=Q8iFC7Wn+liBu/RpKPShQUgrIsbC2BiPVqKQJ4ow151j0pZ2Pyn2rOccHXiFGrvBCJ pEDhrlL4R+n/qi885dix8svSDM0nDb5I3bTrd+usVawrwYIRgDPdN9UeHaRVJjhBBGHs 1VZqthVsY00X8Mp4w28l8/SyQ2Ysl/NGIoHuL0QwHQgSB/HzxUqI1KKVDm7BVFntyqyI hp4F+ai4umGdi+9dIBma+oKRsxhcM2Djt1t/ELhKDazz5JbfGBA9lsVQ7XLkkfUjkupv ATatYWCKatBo3KEscrJuwBUXafcMamFHiPf4O4NnzXz1EBtFfgi/VYFOVaYQ6DYcQyhH Xc1A== X-Gm-Message-State: AC+VfDwVEBvmyRt1+NqG5V9q1BQXHbmZ3LIKGCXWf2q9Zc01X61Av/GQ E77G+DuJEoCNBcrrfLCy2DUCUcc= X-Received: from pcc-desktop.svl.corp.google.com ([2620:15c:2d3:205:b3a7:7c59:b96b:adaa]) (user=pcc job=sendgmr) by 2002:a5b:309:0:b0:ba6:a54d:1cae with SMTP id j9-20020a5b0309000000b00ba6a54d1caemr8869621ybp.0.1684290085477; Tue, 16 May 2023 19:21:25 -0700 (PDT) Date: Tue, 16 May 2023 19:21:11 -0700 In-Reply-To: <20230517022115.3033604-1-pcc@google.com> Message-Id: <20230517022115.3033604-2-pcc@google.com> Mime-Version: 1.0 References: <20230517022115.3033604-1-pcc@google.com> X-Mailer: git-send-email 2.40.1.606.ga4b1b128d6-goog Subject: [PATCH v3 1/3] mm: Call arch_swap_restore() from do_swap_page() From: Peter Collingbourne To: Catalin Marinas Cc: Peter Collingbourne , " =?utf-8?b?UXVuLXdlaSBMaW4gKA==?= =?utf-8?b?5p6X576k5bS0KQ==?= " , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "surenb@google.com" , "david@redhat.com" , " =?utf-8?b?Q2hpbndlbiBDaGFuZyAo5by1?= =?utf-8?b?6Yym5paHKQ==?= " , "kasan-dev@googlegroups.com" , " =?utf-8?b?S3Vh?= =?utf-8?b?bi1ZaW5nIExlZSAo5p2O5Yag56mOKQ==?= " , " =?utf-8?b?Q2FzcGVyIExpICjmnY7kuK3mpq4p?= " , "gregkh@linuxfoundation.org" , vincenzo.frascino@arm.com, Alexandru Elisei , will@kernel.org, eugenis@google.com, Steven Price , stable@vger.kernel.org X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED, USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1766106581188509556?= X-GMAIL-MSGID: =?utf-8?q?1766106581188509556?= Commit c145e0b47c77 ("mm: streamline COW logic in do_swap_page()") moved the call to swap_free() before the call to set_pte_at(), which meant that the MTE tags could end up being freed before set_pte_at() had a chance to restore them. Fix it by adding a call to the arch_swap_restore() hook before the call to swap_free(). Signed-off-by: Peter Collingbourne Link: https://linux-review.googlesource.com/id/I6470efa669e8bd2f841049b8c61020c510678965 Cc: # 6.1 Fixes: c145e0b47c77 ("mm: streamline COW logic in do_swap_page()") Reported-by: Qun-wei Lin (林群崴) Closes: https://lore.kernel.org/all/5050805753ac469e8d727c797c2218a9d780d434.camel@mediatek.com/ Acked-by: "Huang, Ying" Acked-by: David Hildenbrand Reviewed-by: Steven Price Acked-by: Catalin Marinas --- v2: - Call arch_swap_restore() directly instead of via arch_do_swap_page() mm/memory.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index f69fbc251198..fc25764016b3 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3932,6 +3932,13 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) } } + /* + * Some architectures may have to restore extra metadata to the page + * when reading from swap. This metadata may be indexed by swap entry + * so this must be called before swap_free(). + */ + arch_swap_restore(entry, folio); + /* * Remove the swap entry and conditionally try to free up the swapcache. * We're already holding a reference on the page but haven't mapped it From patchwork Wed May 17 02:21:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Collingbourne X-Patchwork-Id: 95013 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b0ea:0:b0:3b6:4342:cba0 with SMTP id b10csp839957vqo; Tue, 16 May 2023 19:57:29 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ67/No4/meVe85Pwfxcb8XTS+uqio79g876Lrebx/8BaeuxPT2PykNOsLWeuPx2YcxKlOek X-Received: by 2002:a17:902:c115:b0:1aa:d866:33cf with SMTP id 21-20020a170902c11500b001aad86633cfmr39657118pli.56.1684292249575; Tue, 16 May 2023 19:57:29 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1684292249; cv=none; d=google.com; s=arc-20160816; b=dado3llHw8XC65BklBs9RHBnqujZznSsI/PxkzRMuQsWhZOczFSrQwm9mFV/DWtJi2 I8Kjy9CYIjpFwZmYnl8srCO08pnfhz/w1qAAcOvC/URJGImPZqmRgry1qSeDzPKRYuUE 3UWXo5sdVY1b5KtzD511FNz2x+RHZ0FGXAlyW1EI4KKq81q9Uj6povNcgDK0HLAWhsD1 pu0zxQ25S/P5Td1Ulr63b954uPUz9SmdmSKVUC55lFdPB9DAn6nMVVW/xirWr5k/jM8Q roGaAQffVHhHrd16HKGi/6Llr8shBgFuH4K62ukePuqZtB8Mbf4HFjCtDL2Kv+BpgOsz 7mIQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:from:subject:references:mime-version :message-id:in-reply-to:date:dkim-signature; bh=DmZ7qJu2QJbmubDEgRMJhswdry7Qhukww11ZPOJRgvs=; b=VE+0Gt8ontKgDIWTrIZLrz8SzwsByEwQ/Bp058rJMqwa0CyPgXb7yz3m/hf3LahMwX /sOlaucO7MrhSdak8AtU2vuH18seSVFXF0Nm53qebqNtMbKD9IWROFR88VM4vM3fChUn KXMjvjw68FDNu0M7zBDIeILbxml/l/pRbF6OLd3nHTsvuCd46r8E1UHWMG+Rk4KoJ1X4 3DhexlXpxey06NENf0Ezcwri4Ky1sEMjxUaRcVOJcHlJz8LoAkx6BzYx1lUiVqpe9cBT Q7BRuIYKMV+AbgDiNN8OyWR77CQZ6zKaXl/W+j8Pr5b3QwL4mSoO7n7SAvwsVwznapuh oQzw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20221208 header.b=pXVJppsk; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id b6-20020a170902b60600b001ab0c00aec4si12075766pls.482.2023.05.16.19.57.17; Tue, 16 May 2023 19:57:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20221208 header.b=pXVJppsk; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231919AbjEQCVd (ORCPT + 99 others); Tue, 16 May 2023 22:21:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231899AbjEQCV3 (ORCPT ); Tue, 16 May 2023 22:21:29 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8A4E940EF for ; Tue, 16 May 2023 19:21:28 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-ba8337a578dso151746276.1 for ; Tue, 16 May 2023 19:21:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1684290087; x=1686882087; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=DmZ7qJu2QJbmubDEgRMJhswdry7Qhukww11ZPOJRgvs=; b=pXVJppsksfHh4I2n3d8xVcufhKZZlJjnCny+rmQ4mjQKI0AW/cCK2hASK83KfSiYpL SwH5TVvYpvNqffEsNvDPgC+nhgLYFM3KaqHCuYbPaIFzls2lqfx0JYU50+6NVWzrME9W 1mfRz5hwNYEvKHUFnlT4dknNheNNzedfdZLSkBZlu7QlWmiIOdq/l+RcVRDobfHZBP0c 7otPYVh11OT4odfN5rNmMB6Xfe/sUmOnKNfozY8i+NNWwTSKo6jWbGtluyHsGeqrt/Um gaSjHg7Sh7LXhrO/UUQMLAjulMUlLvxOhNHHmrBn6+ZKABwqhlZs4QhdwbdE4TaSFaoL o8HQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684290087; x=1686882087; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=DmZ7qJu2QJbmubDEgRMJhswdry7Qhukww11ZPOJRgvs=; b=e0ftyAVCqq0vRIdKMF0bGZLpGogtMPzjlg4t1U0bEifTF8sPW2g/m4qPHPP7hMcoo2 Pw3wqQPyLXdsPHy5t7tVwmHuimJMpbduAZBxm1XNiS/CSDtbfCU2cCcTMpFjQ6g5DGWq NgZh7X7IR6cx1lt4u4MgvXVIz6vshHRyI1hCkigYH0rjgOPm5feIhvuDt64bZUqzjmxe 8OFsdRQSyoJAxlzcPH/Zq2wpqe/iIj3fgijCHnHP/gZutFL0tRWyp8U5WmLVlEpF9mf8 H8QqRJgcqsEAor9HDI5iDURQMQTv/x6BKAnbBiLGayDNd5GHzsp+CfspiTyLoXiiVBoI L7zQ== X-Gm-Message-State: AC+VfDyZec4nQXNQQ17UaFIPhwAiiuj4uoQACgfBnb8W1MAacB3XvOuf Q/7w9KbMD/FFTW4ppXUh63AHn+o= X-Received: from pcc-desktop.svl.corp.google.com ([2620:15c:2d3:205:b3a7:7c59:b96b:adaa]) (user=pcc job=sendgmr) by 2002:a25:8407:0:b0:ba8:4b22:4e8a with SMTP id u7-20020a258407000000b00ba84b224e8amr1065312ybk.0.1684290087741; Tue, 16 May 2023 19:21:27 -0700 (PDT) Date: Tue, 16 May 2023 19:21:12 -0700 In-Reply-To: <20230517022115.3033604-1-pcc@google.com> Message-Id: <20230517022115.3033604-3-pcc@google.com> Mime-Version: 1.0 References: <20230517022115.3033604-1-pcc@google.com> X-Mailer: git-send-email 2.40.1.606.ga4b1b128d6-goog Subject: [PATCH v3 2/3] mm: Call arch_swap_restore() from unuse_pte() From: Peter Collingbourne To: Catalin Marinas Cc: Peter Collingbourne , " =?utf-8?b?UXVuLXdlaSBMaW4gKA==?= =?utf-8?b?5p6X576k5bS0KQ==?= " , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "surenb@google.com" , "david@redhat.com" , " =?utf-8?b?Q2hpbndlbiBDaGFuZyAo5by1?= =?utf-8?b?6Yym5paHKQ==?= " , "kasan-dev@googlegroups.com" , " =?utf-8?b?S3Vh?= =?utf-8?b?bi1ZaW5nIExlZSAo5p2O5Yag56mOKQ==?= " , " =?utf-8?b?Q2FzcGVyIExpICjmnY7kuK3mpq4p?= " , "gregkh@linuxfoundation.org" , vincenzo.frascino@arm.com, Alexandru Elisei , will@kernel.org, eugenis@google.com, Steven Price X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED, USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1766108429867654868?= X-GMAIL-MSGID: =?utf-8?q?1766108429867654868?= We would like to move away from requiring architectures to restore metadata from swap in the set_pte_at() implementation, as this is not only error-prone but adds complexity to the arch-specific code. This requires us to call arch_swap_restore() before calling swap_free() whenever pages are restored from swap. We are currently doing so everywhere except in unuse_pte(); do so there as well. Signed-off-by: Peter Collingbourne Link: https://linux-review.googlesource.com/id/I68276653e612d64cde271ce1b5a99ae05d6bbc4f Acked-by: David Hildenbrand Reviewed-by: Steven Price Acked-by: Catalin Marinas --- mm/swapfile.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/swapfile.c b/mm/swapfile.c index 274bbf797480..e9843fadecd6 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1794,6 +1794,13 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd, goto setpte; } + /* + * Some architectures may have to restore extra metadata to the page + * when reading from swap. This metadata may be indexed by swap entry + * so this must be called before swap_free(). + */ + arch_swap_restore(entry, page_folio(page)); + /* See do_swap_page() */ BUG_ON(!PageAnon(page) && PageMappedToDisk(page)); BUG_ON(PageAnon(page) && PageAnonExclusive(page)); From patchwork Wed May 17 02:21:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Collingbourne X-Patchwork-Id: 95004 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b0ea:0:b0:3b6:4342:cba0 with SMTP id b10csp838062vqo; Tue, 16 May 2023 19:52:06 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ5aZaUW1QMVJzE5TgIOABqf5xc6efVVwI0g909r0PhjcifXxq+Jw0O4Dl8HAR2FLtIfxPzq X-Received: by 2002:a05:6a20:3d09:b0:ee:f290:5b5e with SMTP id y9-20020a056a203d0900b000eef2905b5emr50060111pzi.43.1684291926006; Tue, 16 May 2023 19:52:06 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1684291925; cv=none; d=google.com; s=arc-20160816; b=YVmu8fUInH+9alPtOpp9xmz2t4TLnCWQbjqm8gP6gmC1mwW395W4hT6Y1XurNQcNUT GMxlMOojZg+3VoTIrE4rj/5d3F6Emdw4KPAGdGTRaXo/EonYXjo15nO3DgD2VieVMLnl 3xmeHmtd7quFsJivKBoFOssO+ig40GGLpAN9cugVkv0PaLzD4GqbumZcvXZpyeMSYDh/ qKK6yHDZQf8o/xjHISUIqFeEGsqkfLhGjn7MjmUY4SOidPe7iFQfvLEcW1xdsC64lFwt pf9h348z/pNMEnyyzAI22gWaU7uJp7nz5FiUujTHNqG4xnOzGlUFRBm16fn9OsMWJrFa taaQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:from:subject:references:mime-version :message-id:in-reply-to:date:dkim-signature; bh=rrlZpn5lxQz0wYWidXhNS5k4qYdBDD7AOOGwfPiDsdQ=; b=TBOMEooe+es+piyvmxe14p31AMyQOvfyOFU8UYNW0oKf9QHp9c+6v+q0L0B86K9ch8 limucqPQx2zYZNJakhpmcr2CmKzEdbUfgPByXHRo4sZPFJWsTe3WMUWjh2noNVMxnq9l MqOvvtWjx8jznn26C54bSsbqHZuvum00b215GWIuNQ8MdIlfb/+yk1KtmEgXZbb86qG5 dm6CBBuhuNaP1jP9fKOl3nPTDsucJlOMyfqxTAjLc45LRk5rwwDnmqPSag2xMSzGM90x eQDfChmOTraFUaPJUgJ+Ui+dorUSfdPclLDH3MteQE/VxwMrW0KLQITYbzb88cRk5DSD bcpg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20221208 header.b=nS7ih6tl; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id x11-20020a17090a970b00b002498408b1c5si719396pjo.39.2023.05.16.19.51.54; Tue, 16 May 2023 19:52:05 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20221208 header.b=nS7ih6tl; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231924AbjEQCVm (ORCPT + 99 others); Tue, 16 May 2023 22:21:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231913AbjEQCVd (ORCPT ); Tue, 16 May 2023 22:21:33 -0400 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 17465468E for ; Tue, 16 May 2023 19:21:30 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-5611211f767so2888547b3.0 for ; Tue, 16 May 2023 19:21:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1684290090; x=1686882090; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=rrlZpn5lxQz0wYWidXhNS5k4qYdBDD7AOOGwfPiDsdQ=; b=nS7ih6tlhFuvsMZlYwq74HbaDFXcOaTcEpDv9JgzLfbOcJeYHe55FxK9/JT/+cQbri Mn6JAGOT1VNNKqihdxteunOmx5PruJg2/fGmmxtN3oJJTqr4S4WMMQ0nGGzH9yNCitD0 Kqebqjin+DuMmuu1ErU226+1fL8do4fC3XsOIDYwtzvXNYfy2fVo4kDBR9Dx2K31khL6 UbHaRwmvEWWPO7TJUQ+CmLPQ8R7iMGPQ8aPuRy4ci2qpyyMDXCg6i23WhA35RidSAMDh 2IbzmeSuiKtMSP2SW/XYy9SByGadBaD56U2heVCkkevaE6uaQskw46S6Abvm/vT+UB+O 0DLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684290090; x=1686882090; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=rrlZpn5lxQz0wYWidXhNS5k4qYdBDD7AOOGwfPiDsdQ=; b=MYB5QbFGczcaptYxK/3BpkyT4YbBgDlt3dmpy6Cfxb5irAakUpuovuX51GgMn2+r+b 2ycx1F1x9fwUN3U1bUFp7wG3XOeilE88F4pSaAdC7Kfmjp1fkWWfQZDZ5zMHWAXbPOSR mIgAMZ2//G+nUMw2IykR/2EBToDRYPGokILg4eWCOOx0oVJqIx4liEBaqGQKmNc6UzTw 0LgF3ZN796DZpowfc9O34UB8Wde9Jp+6VcsaR0LXU1BW9P1WgIOA8S/mcCCd2Y1EGKRm zmRGakWw1DCIjfOD5F43GVL0l7aGs8MSnYD/3B4sHWgJ8a4lELwmdylhKiYc6H7x1OVs spPw== X-Gm-Message-State: AC+VfDzqCx81MCvv5/h8deGnK/akP5vXKQpo6uCVLe+M3DtnxRiFgKBw ncwQFGVwAfk/sw8QjxUX7ygcXeQ= X-Received: from pcc-desktop.svl.corp.google.com ([2620:15c:2d3:205:b3a7:7c59:b96b:adaa]) (user=pcc job=sendgmr) by 2002:a81:ae54:0:b0:559:f89f:bc81 with SMTP id g20-20020a81ae54000000b00559f89fbc81mr23166501ywk.6.1684290089941; Tue, 16 May 2023 19:21:29 -0700 (PDT) Date: Tue, 16 May 2023 19:21:13 -0700 In-Reply-To: <20230517022115.3033604-1-pcc@google.com> Message-Id: <20230517022115.3033604-4-pcc@google.com> Mime-Version: 1.0 References: <20230517022115.3033604-1-pcc@google.com> X-Mailer: git-send-email 2.40.1.606.ga4b1b128d6-goog Subject: [PATCH v3 3/3] arm64: mte: Simplify swap tag restoration logic From: Peter Collingbourne To: Catalin Marinas Cc: Peter Collingbourne , " =?utf-8?b?UXVuLXdlaSBMaW4gKA==?= =?utf-8?b?5p6X576k5bS0KQ==?= " , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "surenb@google.com" , "david@redhat.com" , " =?utf-8?b?Q2hpbndlbiBDaGFuZyAo5by1?= =?utf-8?b?6Yym5paHKQ==?= " , "kasan-dev@googlegroups.com" , " =?utf-8?b?S3Vh?= =?utf-8?b?bi1ZaW5nIExlZSAo5p2O5Yag56mOKQ==?= " , " =?utf-8?b?Q2FzcGVyIExpICjmnY7kuK3mpq4p?= " , "gregkh@linuxfoundation.org" , vincenzo.frascino@arm.com, Alexandru Elisei , will@kernel.org, eugenis@google.com, Steven Price X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED, USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1766108090248613844?= X-GMAIL-MSGID: =?utf-8?q?1766108090248613844?= As a result of the previous two patches, there are no circumstances in which a swapped-in page is installed in a page table without first having arch_swap_restore() called on it. Therefore, we no longer need the logic in set_pte_at() that restores the tags, so remove it. Because we can now rely on the page being locked, we no longer need to handle the case where a page is having its tags restored by multiple tasks concurrently, so we can slightly simplify the logic in mte_restore_tags(). Signed-off-by: Peter Collingbourne Link: https://linux-review.googlesource.com/id/I8ad54476f3b2d0144ccd8ce0c1d7a2963e5ff6f3 Reviewed-by: Steven Price Reviewed-by: Catalin Marinas --- v3: - Rebased onto arm64/for-next/fixes, which already has a fix for the issue previously tagged, therefore removed Fixes: tag arch/arm64/include/asm/mte.h | 4 ++-- arch/arm64/include/asm/pgtable.h | 14 ++---------- arch/arm64/kernel/mte.c | 37 ++++++-------------------------- arch/arm64/mm/mteswap.c | 7 +++--- 4 files changed, 14 insertions(+), 48 deletions(-) diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h index c028afb1cd0b..4cedbaa16f41 100644 --- a/arch/arm64/include/asm/mte.h +++ b/arch/arm64/include/asm/mte.h @@ -90,7 +90,7 @@ static inline bool try_page_mte_tagging(struct page *page) } void mte_zero_clear_page_tags(void *addr); -void mte_sync_tags(pte_t old_pte, pte_t pte); +void mte_sync_tags(pte_t pte); void mte_copy_page_tags(void *kto, const void *kfrom); void mte_thread_init_user(void); void mte_thread_switch(struct task_struct *next); @@ -122,7 +122,7 @@ static inline bool try_page_mte_tagging(struct page *page) static inline void mte_zero_clear_page_tags(void *addr) { } -static inline void mte_sync_tags(pte_t old_pte, pte_t pte) +static inline void mte_sync_tags(pte_t pte) { } static inline void mte_copy_page_tags(void *kto, const void *kfrom) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 0bd18de9fd97..e8a252e62b12 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -337,18 +337,8 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, * don't expose tags (instruction fetches don't check tags). */ if (system_supports_mte() && pte_access_permitted(pte, false) && - !pte_special(pte)) { - pte_t old_pte = READ_ONCE(*ptep); - /* - * We only need to synchronise if the new PTE has tags enabled - * or if swapping in (in which case another mapping may have - * set tags in the past even if this PTE isn't tagged). - * (!pte_none() && !pte_present()) is an open coded version of - * is_swap_pte() - */ - if (pte_tagged(pte) || (!pte_none(old_pte) && !pte_present(old_pte))) - mte_sync_tags(old_pte, pte); - } + !pte_special(pte) && pte_tagged(pte)) + mte_sync_tags(pte); __check_safe_pte_update(mm, ptep, pte); diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c index 7e89968bd282..c40728046fed 100644 --- a/arch/arm64/kernel/mte.c +++ b/arch/arm64/kernel/mte.c @@ -35,41 +35,18 @@ DEFINE_STATIC_KEY_FALSE(mte_async_or_asymm_mode); EXPORT_SYMBOL_GPL(mte_async_or_asymm_mode); #endif -static void mte_sync_page_tags(struct page *page, pte_t old_pte, - bool check_swap, bool pte_is_tagged) -{ - if (check_swap && is_swap_pte(old_pte)) { - swp_entry_t entry = pte_to_swp_entry(old_pte); - - if (!non_swap_entry(entry)) - mte_restore_tags(entry, page); - } - - if (!pte_is_tagged) - return; - - if (try_page_mte_tagging(page)) { - mte_clear_page_tags(page_address(page)); - set_page_mte_tagged(page); - } -} - -void mte_sync_tags(pte_t old_pte, pte_t pte) +void mte_sync_tags(pte_t pte) { struct page *page = pte_page(pte); long i, nr_pages = compound_nr(page); - bool check_swap = nr_pages == 1; - bool pte_is_tagged = pte_tagged(pte); - - /* Early out if there's nothing to do */ - if (!check_swap && !pte_is_tagged) - return; /* if PG_mte_tagged is set, tags have already been initialised */ - for (i = 0; i < nr_pages; i++, page++) - if (!page_mte_tagged(page)) - mte_sync_page_tags(page, old_pte, check_swap, - pte_is_tagged); + for (i = 0; i < nr_pages; i++, page++) { + if (try_page_mte_tagging(page)) { + mte_clear_page_tags(page_address(page)); + set_page_mte_tagged(page); + } + } /* ensure the tags are visible before the PTE is set */ smp_wmb(); diff --git a/arch/arm64/mm/mteswap.c b/arch/arm64/mm/mteswap.c index cd508ba80ab1..3a78bf1b1364 100644 --- a/arch/arm64/mm/mteswap.c +++ b/arch/arm64/mm/mteswap.c @@ -53,10 +53,9 @@ void mte_restore_tags(swp_entry_t entry, struct page *page) if (!tags) return; - if (try_page_mte_tagging(page)) { - mte_restore_page_tags(page_address(page), tags); - set_page_mte_tagged(page); - } + WARN_ON_ONCE(!try_page_mte_tagging(page)); + mte_restore_page_tags(page_address(page), tags); + set_page_mte_tagged(page); } void mte_invalidate_tags(int type, pgoff_t offset)