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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7D856CCF9F0 for ; Thu, 30 Oct 2025 14:55:17 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D9DF680007; Thu, 30 Oct 2025 10:55:16 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D75398E007D; Thu, 30 Oct 2025 10:55:16 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CB2BF80007; Thu, 30 Oct 2025 10:55:16 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id B7DC98E007D for ; Thu, 30 Oct 2025 10:55:16 -0400 (EDT) Received: from smtpin30.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 6FA4E140186 for ; Thu, 30 Oct 2025 14:55:16 +0000 (UTC) X-FDA: 84055078632.30.9085DC5 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by imf07.hostedemail.com (Postfix) with ESMTP id 1AA5D40011 for ; Thu, 30 Oct 2025 14:55:13 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=M92nI7JD; spf=pass (imf07.hostedemail.com: domain of hca@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=hca@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1761836114; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:references:dkim-signature; bh=PjzyxOO3ljwrWLzxHKYkz0ZaromW3OhRhgdBvzSjnGg=; b=T706Y9q+NxSCtY7wi/Pl9ZAyGcnlJSWmSf7pgGAlaO3LfmOc6tWlNWuSW48QTD5WT2KLdQ gFyNNIzqwGMp/0lOz60xKS5y04EOsIzGDQ7Tc2u8UkahsH/4m6V5qldlLiIV5TKp8wZyb8 wPrmVrW1aw5jLBSDZFn1DbqYqkfw0vk= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=M92nI7JD; spf=pass (imf07.hostedemail.com: domain of hca@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=hca@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1761836114; a=rsa-sha256; cv=none; b=Y8sgRUg1xTrKwMZWv54i3ra2UEKQcbIRWE6dMlqtIuulpZ0QwWlvr3l0B4fOyNLD07edTZ JP1A0neAE+MDCq733zsLXtKit9yPlH3VJIk2X3+aPFOKO/RxIOY5Kn7IHJEH51I8QjzAYN XQF3I/kuSNgD7tO+MEPYZ9hahPfXV/s= Received: from pps.filterd (m0360083.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 59UDADVQ003305; Thu, 30 Oct 2025 14:55:11 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:message-id:mime-version :subject:to; s=pp1; bh=PjzyxOO3ljwrWLzxHKYkz0ZaromW3OhRhgdBvzSjn Gg=; b=M92nI7JDK0C3voI1ojGRzDTU8RZBm4Az1TgZnMbgb9xjxAqUuMrpOaHbp DHOl7zDygZ0P1mqHIBj1JiLXJuQdV17FL8eEY5l9a6fBgh1sZPndGCaPPBqS2snc JggtT0IDWwde7mAozuLFI3L4OzuWiSKxEcaSGEgOOZR9eJuACePKBm9EJNehyli5 m75mEY2QPQnHxnt/CmCqfNXM67j2M0XP/2W5njbCuMaJqcfc9s7cn2aYYupF0HEo XpI0tle8/jk4ttPVmtUEeoD8W2svqC8/iMOHnFINqHKPsHWgbEQBd8DjOtc0iBMd 6ttry/Gl62cUxWWaoz7WKYyIZzZpg== Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4a34a8s2nw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 30 Oct 2025 14:55:11 +0000 (GMT) Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 59UD8brr023836; Thu, 30 Oct 2025 14:55:09 GMT Received: from smtprelay03.fra02v.mail.ibm.com ([9.218.2.224]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4a33vx99nb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 30 Oct 2025 14:55:09 +0000 Received: from smtpav04.fra02v.mail.ibm.com (smtpav04.fra02v.mail.ibm.com [10.20.54.103]) by smtprelay03.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 59UEt5f251642848 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 30 Oct 2025 14:55:05 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7A88620043; Thu, 30 Oct 2025 14:55:05 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4A7CE20040; Thu, 30 Oct 2025 14:55:05 +0000 (GMT) Received: from tuxmaker.lnxne.boe (unknown [9.152.85.9]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 30 Oct 2025 14:55:05 +0000 (GMT) From: Heiko Carstens To: Luiz Capitulino , Gerald Schaefer , Alexander Gordeev , Vasily Gorbik , Christian Borntraeger Cc: Joao Martins , David Hildenbrand , osalvador@suse.de, aneesh.kumar@kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org Subject: [PATCH] s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP Date: Thu, 30 Oct 2025 15:55:05 +0100 Message-ID: <20251030145505.2764038-1-hca@linux.ibm.com> X-Mailer: git-send-email 2.48.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=DYkaa/tW c=1 sm=1 tr=0 ts=69037c4f cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=20KFwNOVAAAA:8 a=VnNF1IyMAAAA:8 a=a44tTfYfhnqc_Lg12qoA:9 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-GUID: iMMC-bQfclUX4SL_LRv1u-0FsUQmA35x X-Proofpoint-ORIG-GUID: iMMC-bQfclUX4SL_LRv1u-0FsUQmA35x X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDI4MDE2NiBTYWx0ZWRfXyKmS31ZKoikD DpRLyjcWCZHMaGqL2jmly+DRIIPTCimQSXJjpHHNpP7Cw3e2AaoyZfZ1sPYZ5g0TiXZj7Cqhvnw mGX5jmEtnBngBH/C0jxc53+9dxOiGwuUA00Uq/DOBY5OS64GI/3UMaikh/l+RXbRyWUypJN45eK tCf73BmX5IVqcgRZXyPlInSMlYtuOB80HH42T9cqGAhmzQMCfPeLeaYDTpCNG+vVyyiav5/uNJC KXQdlYLDQcav/rhq9tjeIHUXGqV676+NOToVyZztGuuNS11lRDTUxGqKn3fvE5lTqyLh5UJZqzf g51j3moXpQ8+OvJFI1MjsJI7fNNiwvf4+kCxKIJN9jNLhXKF6DJQVn8HQ2t2lrACrtOJOk5ydwF OU1dlQsNQppL7T0dqHSMugBcJJUy7Q== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-10-30_04,2025-10-29_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 malwarescore=0 bulkscore=0 impostorscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2510280166 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 1AA5D40011 X-Stat-Signature: utnqfcem71qjnweok76cozz1cz7ekdmu X-Rspam-User: X-HE-Tag: 1761836113-237836 X-HE-Meta: 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 m5RrpfN+ jiJdEJ8MlnddgZ3qq3qHJBOrekLLhjUYWLdI88urOnbw8hhhZRihFIG/VaY9e0c++Mu3a1mo2LL65AJoRLUocxHEnL6/CWm0+p4WC8/SfFiQ2Doml6zaLyzWnhKTxy1NiZCCfYxeDRVQpbJMOziB3MrmsHdRYtz8Q2joMRDvqqcW1edsG6KNs8ssFZ8LICK8AtOVIfwsI6HluroZYcI+7qVZK62ypn/q5t1inkkMJMsehC3KjqewjH8B87SOr/RBMTWWzob1q2TTPF3OJ/KZuxLMJ68xugRjERcAfbvrzNApH68Q= 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: List-Subscribe: List-Unsubscribe: As reported by Luiz Capitulino enabling HVO on s390 leads to reproducible crashes. The problem is that kernel page tables are modified without flushing corresponding TLB entries. Even if it looks like the empty flush_tlb_all() implementation on s390 is the problem, it is actually a different problem: on s390 it is not allowed to replace an active/valid page table entry with another valid page table entry without the detour over an invalid entry. A direct replacement may lead to random crashes and/or data corruption. In order to invalidate an entry special instructions have to be used (e.g. ipte or idte). Alternatively there are also special instructions available which allow to replace a valid entry with a different valid entry (e.g. crdte or cspg). Given that the HVO code currently does not provide the hooks to allow for an implementation which is compliant with the s390 architecture requirements, disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP again, which is basically a revert of the original patch which enabled it. Reported-by: Luiz Capitulino Closes: https://lore.kernel.org/all/20251028153930.37107-1-luizcap@redhat.com/ Fixes: 00a34d5a99c0 ("s390: select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP") Cc: stable@vger.kernel.org Signed-off-by: Heiko Carstens --- arch/s390/Kconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index c4145672ca34..df22b10d9141 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -158,7 +158,6 @@ config S390 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM select ARCH_WANT_KERNEL_PMD_MKWRITE select ARCH_WANT_LD_ORPHAN_WARN - select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP select ARCH_WANTS_THP_SWAP select BUILDTIME_TABLE_SORT select CLONE_BACKWARDS2 -- 2.48.1