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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79984C77B75 for ; Tue, 23 May 2023 00:51:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234002AbjEWAv6 (ORCPT ); Mon, 22 May 2023 20:51:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232331AbjEWAvm (ORCPT ); Mon, 22 May 2023 20:51:42 -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 71B6E4C3F for ; Mon, 22 May 2023 17:44:59 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-babb7aaa605so5322208276.3 for ; Mon, 22 May 2023 17:44:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1684802597; x=1687394597; 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=msTm3oYdeXIT0hSlyDwQQkvc5wY+Q8yhko13bmJatr8=; b=GVCKc+6rFVLitBZRgjiG8Xp6MHuRDVhZtsHNX/VKvhjNUXI2g+oF9FkWUEYw2KzSxD jp4IhTdFiglLXHuJvOecRUNblTjQqoij5ls5a85sMq/WccA2cWXYiEuTGZE2QPc25z1P I8fzTiWeaDqvG0LuwqBGkTuunNP3dF5yHaQZQWU03AGRfLddIWVSlV0GDW2IfHKUwGIa kJWuZ1I6IkldXrYkOwPS0n6CmraBvOXwhnVIajQXxhcVGPXShTLQ3KiXtaS4Kg9Pbdet qc17JRlFojhHHmnUA1aiDUv9PQDzUO/0c5Sa9DD8d5/h5mOmX7eaqslAsS0IaFcRV2+j ohtg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684802597; x=1687394597; 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=msTm3oYdeXIT0hSlyDwQQkvc5wY+Q8yhko13bmJatr8=; b=QIb8BqVmpvSIr7HnVXogYInd6JS3on4Oeoi0x3fMuBOJNG6pWo3xmj0xcuTy4TBlKT pLoohja6XEYuVcHzL5CGysbgqm6iy0vKZ7jeUFfUC3/u+M0szgwhVTJM47rP4MckNlbh MI+IYM1SsgsXlMt4HuDA3La0dh33hr0iBr3ofdwKpkm8u/+O9Kb2fKO1Gw4daBhP2i2F VPKpgbDFkVpWR9oByWM0FQi3oTWtYtBDjeyehSYqG32OqxZmcYKhlBmaNylngrMaPkHp nlqx4OhbeFqOWnk26YNBCWNka73mOxPqErCo1gKP7gxrfyXRfFw3HwWtRwryxA5L8Q2T aQvg== X-Gm-Message-State: AC+VfDyYU1+IIGipQf+kyhS2/1ayvuNknJrxZw6afo6kNs4lzWlyPRwE 6E+xfJQmj61VVMcFvCmbPvesywY= X-Google-Smtp-Source: ACHHUZ6kHjMTCHPdYe9Jo2a981mU1PnCLbxJJT05Im440Cs+gDDAq2rqaJTbIgDZ3JZeNb3/fmzcm8U= X-Received: from pcc-desktop.svl.corp.google.com ([2620:15c:2d3:205:3d33:90fe:6f02:afdd]) (user=pcc job=sendgmr) by 2002:a25:10d4:0:b0:ba8:181b:2558 with SMTP id 203-20020a2510d4000000b00ba8181b2558mr7332911ybq.4.1684802597761; Mon, 22 May 2023 17:43:17 -0700 (PDT) Date: Mon, 22 May 2023 17:43:08 -0700 In-Reply-To: <20230523004312.1807357-1-pcc@google.com> Message-Id: <20230523004312.1807357-2-pcc@google.com> Mime-Version: 1.0 References: <20230523004312.1807357-1-pcc@google.com> X-Mailer: git-send-email 2.40.1.698.g37aff9b760-goog Subject: [PATCH v4 1/3] mm: Call arch_swap_restore() from do_swap_page() From: Peter Collingbourne To: Catalin Marinas Cc: Peter Collingbourne , "=?UTF-8?q?Qun-wei=20Lin=20=28=E6=9E=97=E7=BE=A4=E5=B4=B4=29?=" , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "surenb@google.com" , "david@redhat.com" , "=?UTF-8?q?Chinwen=20Chang=20=28=E5=BC=B5=E9=8C=A6=E6=96=87=29?=" , "kasan-dev@googlegroups.com" , "=?UTF-8?q?Kuan-Ying=20Lee=20=28=E6=9D=8E=E5=86=A0=E7=A9=8E=29?=" , "=?UTF-8?q?Casper=20Li=20=28=E6=9D=8E=E4=B8=AD=E6=A6=AE=29?=" , "gregkh@linuxfoundation.org" , vincenzo.frascino@arm.com, Alexandru Elisei , will@kernel.org, eugenis@google.com, Steven Price , stable@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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/I6470efa669e8bd2f841049b8c61= 020c510678965 Cc: # 6.1 Fixes: c145e0b47c77 ("mm: streamline COW logic in do_swap_page()") Reported-by: Qun-wei Lin (=E6=9E=97=E7=BE=A4=E5=B4=B4) Closes: https://lore.kernel.org/all/5050805753ac469e8d727c797c2218a9d780d43= 4.camel@mediatek.com/ Acked-by: David Hildenbrand Acked-by: "Huang, Ying" 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) } } =20 + /* + * 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 --=20 2.40.1.698.g37aff9b760-goog