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=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 B57B9C3A5A4 for ; Fri, 30 Aug 2019 12:07:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6842521897 for ; Fri, 30 Aug 2019 12:07:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6842521897 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B8AFC6B0006; Fri, 30 Aug 2019 08:07:24 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B12B06B0008; Fri, 30 Aug 2019 08:07:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9D9D66B000A; Fri, 30 Aug 2019 08:07:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0246.hostedemail.com [216.40.44.246]) by kanga.kvack.org (Postfix) with ESMTP id 75CC36B0006 for ; Fri, 30 Aug 2019 08:07:24 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 1C985181AC9B6 for ; Fri, 30 Aug 2019 12:07:24 +0000 (UTC) X-FDA: 75878969208.03.day26_7abc01fc8f804 X-HE-Tag: day26_7abc01fc8f804 X-Filterd-Recvd-Size: 5260 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by imf35.hostedemail.com (Postfix) with ESMTP for ; Fri, 30 Aug 2019 12:07:23 +0000 (UTC) Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x7UC3Fmg061175 for ; Fri, 30 Aug 2019 08:07:22 -0400 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2uq25wk8fr-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 30 Aug 2019 08:07:21 -0400 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 30 Aug 2019 13:07:16 +0100 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x7UC7ELY37355652 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 30 Aug 2019 12:07:14 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7E1E04204F; Fri, 30 Aug 2019 12:07:14 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B398742047; Fri, 30 Aug 2019 12:07:13 +0000 (GMT) Received: from pomme.com (unknown [9.145.17.35]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 30 Aug 2019 12:07:13 +0000 (GMT) From: Laurent Dufour To: mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, aneesh.kumar@linux.ibm.com, npiggin@gmail.com Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 0/3] powerpc/mm: Conditionally call H_BLOCK_REMOVE Date: Fri, 30 Aug 2019 14:07:09 +0200 X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 19083012-0016-0000-0000-000002A4A2D8 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19083012-0017-0000-0000-00003304FD2D Message-Id: <20190830120712.22971-1-ldufour@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-08-30_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=787 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908300132 Content-Transfer-Encoding: quoted-printable 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: Since the commit ba2dd8a26baa ("powerpc/pseries/mm: call H_BLOCK_REMOVE")= , the call to H_BLOCK_REMOVE is always done if the feature is exhibited. On some system, the hypervisor may not support all the combination of segment base page size and page size. When this happens the hcall is returning H_PARAM, which is triggering a BUG_ON check leading to a panic. The PAPR document is specifying a TLB Block Invalidate Characteristics it= em detailing which couple base page size, page size the hypervisor is supporting through H_BLOCK_REMOVE. Furthermore, the characteristics are also providing the size of the block the hcall could process. Supporting various block size seems not needed as all systems I was able = to play with was support an 8 addresses block size, which is the maximum through the hcall. Supporting various size may complexify the algorithm i= n call_block_remove() so unless this is required, this is not done. In the case of block size different from 8, a warning message is displaye= d at boot time and that block size will be ignored checking for the H_BLOCK_REMOVE support. Due to the minimal amount of hardware showing a limited set of H_BLOCK_REMOVE supported page size, I don't think there is a need to push this series to the stable mailing list. The first patch is initializing the penc values for each page size to an invalid value to be able to detect those which have been initialized as 0 is a valid value. The second patch is reading the characteristic through the hcall ibm,get-system-parameter and record the supported block size for each pag= e size. The third patch is changing the check used to detect the H_BLOCK_REMOVE availability to take care of the base page size and page size couple. Laurent Dufour (3): powerpc/mm: Initialize the HPTE encoding values powperc/mm: read TLB Block Invalidate Characteristics powerpc/mm: call H_BLOCK_REMOVE when supported arch/powerpc/include/asm/book3s/64/mmu.h | 3 + arch/powerpc/mm/book3s64/hash_utils.c | 8 +- arch/powerpc/platforms/pseries/lpar.c | 118 ++++++++++++++++++++++- 3 files changed, 125 insertions(+), 4 deletions(-) --=20 2.23.0