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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) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: 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 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