From patchwork Fri Sep 4 10:30:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 11756525 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 3D73B618 for ; Fri, 4 Sep 2020 10:30:56 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0D1082151B for ; Fri, 4 Sep 2020 10:30:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D1082151B 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 00F336B007E; Fri, 4 Sep 2020 06:30:54 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id EB6546B0081; Fri, 4 Sep 2020 06:30:53 -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 D3A546B007E; Fri, 4 Sep 2020 06:30:53 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0155.hostedemail.com [216.40.44.155]) by kanga.kvack.org (Postfix) with ESMTP id B638A6B007E for ; Fri, 4 Sep 2020 06:30:53 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 87B5B824556B for ; Fri, 4 Sep 2020 10:30:53 +0000 (UTC) X-FDA: 77225010786.02.part74_1b0bafb270b1 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin02.hostedemail.com (Postfix) with ESMTP id 57F23100AF08B for ; Fri, 4 Sep 2020 10:30:53 +0000 (UTC) X-Spam-Summary: 1,0,0,d9e0195e4c7a9526,d41d8cd98f00b204,cmainas@kernel.org,,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1311:1314:1345:1359:1431:1437:1515:1534:1541:1711:1730:1747:1777:1792:2198:2199:2393:2553:2559:2562:2693:2731:3138:3139:3140:3141:3142:3352:3865:3866:3867:3868:3870:3871:3872:3874:4321:4605:5007:6261:7875:7903:10004:11026:11232:11233:11658:11914:12114:12296:12297:12438:12517:12519:12555:13069:13180:13229:13311:13357:13894:14096:14181:14384:14394:14721:21080:21220:21230:21451:21627:21740:21795:30051:30054:30090,0,RBL:198.145.29.99:@kernel.org:.lbl8.mailshell.net-62.2.0.100 64.100.201.201;04yfocjx3qymcegdfzrm5fsr435j1ycmg7ncymac3ros8gyobdpyp69goph9ic8.qb885dc7wsnojjmr4zeosqm9y9p4f7a8wjhr7t6h5ndauine96k9iysgkmwganb.o-lbl8.mailshell.net-223.238.255.100,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:23,LUA_SUMMARY:none X-HE-Tag: part74_1b0bafb270b1 X-Filterd-Recvd-Size: 2762 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf40.hostedemail.com (Postfix) with ESMTP for ; Fri, 4 Sep 2020 10:30:52 +0000 (UTC) Received: from localhost.localdomain (unknown [46.69.195.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3A1502145D; Fri, 4 Sep 2020 10:30:50 +0000 (UTC) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, Will Deacon , Dave P Martin , Vincenzo Frascino , Szabolcs Nagy , Kevin Brodsky , Andrey Konovalov , Peter Collingbourne , Andrew Morton Subject: [PATCH v9 08/29] mm: Preserve the PG_arch_2 flag in __split_huge_page_tail() Date: Fri, 4 Sep 2020 11:30:08 +0100 Message-Id: <20200904103029.32083-9-catalin.marinas@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200904103029.32083-1-catalin.marinas@arm.com> References: <20200904103029.32083-1-catalin.marinas@arm.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 57F23100AF08B X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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: When a huge page is split into normal pages, part of the head page flags are transferred to the tail pages. However, the PG_arch_* flags are not part of the preserved set. PG_arch_2 is used by the arm64 MTE support to mark pages that have valid tags. The absence of such flag would cause the arm64 set_pte_at() to clear the tags in order to avoid stale tags exposed to user or the swapping out hooks to ignore the tags. Not preserving PG_arch_2 on huge page splitting leads to tag corruption in the tail pages. Preserve the newly added PG_arch_2 flag in __split_huge_page_tail(). Signed-off-by: Catalin Marinas Cc: Andrew Morton --- Notes: v7: - Only preserve PG_arch_2 in __split_huge_page_tail(). The PG_arch_1 flag will be discussed separately as it may potentially impact s390 and x86. New in v6. mm/huge_memory.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 2ccff8472cd4..1a5773c95f53 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2337,6 +2337,9 @@ static void __split_huge_page_tail(struct page *head, int tail, (1L << PG_workingset) | (1L << PG_locked) | (1L << PG_unevictable) | +#ifdef CONFIG_64BIT + (1L << PG_arch_2) | +#endif (1L << PG_dirty))); /* ->mapping in first tail page is compound_mapcount */