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Thu, 25 Sep 2025 22:42:37 +0000 (GMT) Message-ID: <336c0402c59363956d0c4eefc1b8a059e1fcc8e4.camel@linux.ibm.com> Subject: Re: [PATCH v17 00/12] Support page table check on PowerPC From: Andrew Donnellan To: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org Cc: akpm@linux-foundation.org, x86@kernel.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, pasha.tatashin@soleen.com, sweettea-kernel@dorminy.me, nicholas@linux.ibm.com, christophe.leroy@csgroup.eu, alexghiti@rivosinc.com Date: Fri, 26 Sep 2025 08:42:35 +1000 In-Reply-To: <20250909091335.183439-1-ajd@linux.ibm.com> References: <20250909091335.183439-1-ajd@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTI1MDE3NCBTYWx0ZWRfX5ysG32sTPFXd uf1R0BRsI0BKicwSpsBxEsSI2a3nnZJqMzF1o90w6Fz3y2zUhPJ2779DnKRJOVaK9VhKCmsSlHP /2MXq9DBNTVGPSPGGD9cbqJyAOkD0q7UeemycTSAdzGpVHSooWMOLLYPjP3KyU20YaYxH+bkEin MGJn3OOl4+vJti0slRv6mCHzTZ0n7nQaw9gF4Vg4N0KsY1Vd6Dwr0iLkqNCzKSRcTrk+q8Dol9Q qU4YSwx4Ahh4WWCTr1UhV4TK9Af+6BnwFIHzvgf7l8TqmRVWGOLGhqpqa+uiQSq8ueI4HKd5JZh VqBopl4TR4l8azCp1YGG5ilHhX/5mUQSAG+mGp/8c7m70OyuL/TydKQdeAYOkVykSxlq+rjcDlP DcEqcvCGhSw8iFb5/oSEczTL3v5p3Q== X-Proofpoint-GUID: dpRrG9bUj2ZLNf81WWW-h6dqNNtNb9Wo X-Authority-Analysis: v=2.4 cv=T/qBjvKQ c=1 sm=1 tr=0 ts=68d5c564 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=VnNF1IyMAAAA:8 a=owR7qqmZskU0YpnQVroA:9 a=QEXdDO2ut3YA:10 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-ORIG-GUID: dpRrG9bUj2ZLNf81WWW-h6dqNNtNb9Wo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-25_02,2025-09-25_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 priorityscore=1501 impostorscore=0 suspectscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 clxscore=1015 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2509150000 definitions=main-2509250174 X-Stat-Signature: 77hb8qpzfyexdt575od5se467qkt1mw5 X-Rspam-User: X-Rspamd-Queue-Id: 9CFEE1A0007 X-Rspamd-Server: rspam04 X-HE-Tag: 1758840170-862882 X-HE-Meta: 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 lVqwR247 qLR6huE16FIBNec1k7w7kBQ2FZ+PnXPw490yWGUC+sMgkT+aecbImor13ZVPA8qHJfWHHmvhQLk7BmUzZxJbfDqla1o49ruM35A9JCQxvXiE4FYC09HUUOLAz7LWmL37ZaUQHtrN371sbP3eqB0HYpkSKcLThb/e96SJd27T2AD4BfRkeydt8pSYw84GlICYsP6A0/gYbGi+6koFbbdDWzZnfHQ== 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: Hi Andrew, On Tue, 2025-09-09 at 19:13 +1000, Andrew Donnellan wrote: > Support page table check on all PowerPC platforms. This works by serialis= ing > assignments, reassignments and clears of page table entries at each level= in > order to ensure that anonymous mappings have at most one writable consume= r, > and likewise that file-backed mappings are not simultaneously also anonym= ous > mappings. >=20 > In order to support this infrastructure, a number of helpers or stubs mus= t be > defined or updated for all powerpc platforms. Additionally, we separate > set_pte_at() and set_pte_at_unchecked(), to allow for internal, uninstrum= ented > mappings. >=20 > On some PowerPC platforms, implementing {pte,pmd,pud}_user_accessible_pag= e() > requires the address. We revert previous changes that removed the address > parameter from various interfaces, and add it to some other interfaces, > in order to allow this. >=20 > Note that on 32 bit systems with CONFIG_KFENCE=3Dy, you need [0] to avoid > possible failures in init code (this is a code patching/static keys issue= , > which was discovered by a user testing this series but isn't a bug in pag= e > table check). >=20 > (This series was initially written by Rohan McLure, who has left IBM and > is no longer working on powerpc.) Is this likely to make it in in time for 6.18, or should I respin it post m= erge window? Thanks, Andrew --=20 Andrew Donnellan OzLabs, ADL Canberra ajd@linux.ibm.com IBM Australia Limited