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Thu, 13 Mar 2025 02:54:43 +0000 (GMT) Received: from jarvis.ozlabs.ibm.com (haven.au.ibm.com [9.63.198.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 0DB40602DC; Thu, 13 Mar 2025 13:54:40 +1100 (AEDT) Message-ID: <006ac081cf0e130426bcf0ef777bed346f6df002.camel@linux.ibm.com> Subject: Re: [PATCH v13 00/11] Support page table check on PowerPC From: Andrew Donnellan To: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, pasha.tatashin@soleen.com, akpm@linux-foundation.org, maddy@linux.ibm.com Cc: x86@kernel.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, sweettea-kernel@dorminy.me Date: Thu, 13 Mar 2025 13:54:39 +1100 In-Reply-To: <20250211161404.850215-1-ajd@linux.ibm.com> References: <20250211161404.850215-1-ajd@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 (3.54.3-1.fc41) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: jFxsMj_j4znHUDzGj8WLKmOskt7bM7Fc X-Proofpoint-ORIG-GUID: jFxsMj_j4znHUDzGj8WLKmOskt7bM7Fc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-13_01,2025-03-11_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 mlxlogscore=845 lowpriorityscore=0 spamscore=0 impostorscore=0 bulkscore=0 clxscore=1011 mlxscore=0 phishscore=0 adultscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503130018 X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 1FD36C000B X-Stat-Signature: 9phfct7y4xynd6abwyr7b3xt1jdku4q4 X-HE-Tag: 1741834490-701583 X-HE-Meta: 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 v1g== 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: On Wed, 2025-02-12 at 03:13 +1100, Andrew Donnellan wrote: > Support page table check on all PowerPC platforms. This works by > serialising assignments, reassignments and clears of page table > entries at each level in order to ensure that anonymous mappings > have at most one writable consumer, and likewise that file-backed > mappings are not simultaneously also anonymous mappings. >=20 > In order to support this infrastructure, a number of stubs must be > defined for all powerpc platforms. Additionally, seperate > set_pte_at() > and set_pte_at_unchecked(), to allow for internal, uninstrumented > mappings. Talking to Maddy about this off-list - given that this series touches on generic code and several architectures, would it be best to take it through the mm tree rather than powerpc? --=20 Andrew Donnellan OzLabs, ADL Canberra ajd@linux.ibm.com IBM Australia Limited