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Mon, 12 May 2025 15:05:08 +1000 (AEST) Message-ID: <7f40b03a926145e79c060f5a0cfdab829b2a5f1c.camel@linux.ibm.com> Subject: Re: [PATCH v14 00/11] Support page table check on PowerPC From: Andrew Donnellan To: linuxppc-dev@lists.ozlabs.org, akpm@linux-foundation.org, maddy@linux.ibm.com Cc: x86@kernel.org, linux-mm@kvack.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, christophe.leroy@csgroup.eu Date: Mon, 12 May 2025 15:04:55 +1000 In-Reply-To: <20250411054354.511145-1-ajd@linux.ibm.com> References: <20250411054354.511145-1-ajd@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.1 (3.56.1-1.fc42) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=dNSmmPZb c=1 sm=1 tr=0 ts=68218d5c cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=dt9VzEwgFbYA:10 a=VnNF1IyMAAAA:8 a=VlGTkuFJ5WdtLxIKyCAA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: BEhtyqcew9NhysJzzJPiJH-Y-nhqpckr X-Proofpoint-ORIG-GUID: BEhtyqcew9NhysJzzJPiJH-Y-nhqpckr X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTEyMDA1MiBTYWx0ZWRfXxkgdbtEmf1nz dwd7yYAc5Bva+GTN20ZcaaRJI8dRBGYqlLgSgKVPxDqPaR6nHfb8HftYw/MUT5Pccf9AOHh+lXm Q2he+N8skgs1knm9yr1SAniMXxWCEQptEdIyRFgofwnKH7Nr65r5FhKvJ5t+WWz0934l5Z0tSXx tBO9kzHyy+03JWmDebEltQ0cA1lYhj6PZ+L8R4UBJsehl3Zmloz92oOZ/OBmyEFjB2OUUFpK5Rl g1bOX8IeClFPgllsfpqzZToIVTmXeFfH3VYdhTg8VnVAUuJ6hmP2ygvjHKgKEtqVg1as+SRjpS/ 2bL0qEl5fFyE5HechMx2LuOeZwKveA98APYPOmYvGo9/L36yZEqLjdx2r8tmKXFdxVisOTxvYgw Wsrx2E6M6AW3YRzLDj4mxn8pJsIydIwqWdGM+L7EnvZyMDNVB1iB4wq/1SVLvacjZ6dPiz1/ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-12_01,2025-05-09_01,2025-02-21_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 spamscore=0 adultscore=0 phishscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 impostorscore=0 mlxlogscore=953 malwarescore=0 suspectscore=0 bulkscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2504070000 definitions=main-2505120052 X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 04B2F18000B X-Stat-Signature: sba1a9ushpyf49boznkcpoc87qgyjrhe X-HE-Tag: 1747029346-477101 X-HE-Meta: U2FsdGVkX1/E/tN4vHzuwn8wn8cGJVgvMzu1rytsmSt0a97kn2RelA/I0k9KnKMiB4VikTKAiGEDcGPqVT+5Z2Fvy/Af6WfHnQ3B9/8RpJCX6mZfLsM7xSh9uV5s/v/bciKTI0Z07tyn1DKTVTa+jCWkrhyfw67vbKGorYA0UIrXK2OXi9OR5OHIibzr2p/geeXwO6SEN98IGc8/OtGp7Bg8fgvWB5EV7Q5RFQt8xwm+HneQ6XpLhfP5Kv0Rk67+xwJZ+7bS7w4ibHHoMsuoDBTdLZWWmS0HYrIr2i6zOzcRNbIsS1tXv0C/JA+e52dZx+0wkEt56hasIDhK1vtuN6ZpIcUFsbD8myYSJiPcVHyRXsdtMX/yKzghv+tqfG8ncPeWpCWdIzs/S7j6C7vjZg30fm93+/cdaQBDvibDdyiLE+SiNjD+kBD0exq08sjxWOx22b7xHw7Ry82GC1x4T6/hJwEXQ8jHsLwF/3BU7tvZnUjbjKqEJGi7IvPSGXe3I8nj9UVlPJC4Wrk8MY6Ge6dhYjLUyfUniMOHKkhGAAgxrgxF7vGM1WsdIsHmQ+mNK9GCAEAx7bmQdRBPHrgehJhABWGViVT9UXImd1KHdfcSbxKxpLyRKvaDnwu8EJ2ygknJbfrnYqnGt+wOtm+982QJhQSw4izQGBS0j3NJtGwJYp4K8SP+QlCXwMe72ESEzXLBdR3l29WZP9m84jkWhyvwT416E0ZsOgWamUuLgeS9Yu7c9wsgG/nSQ/PZN8KU0ef2XFl27Y4ZwIlAahKvvGDHoScVYky6Y+CV2MchK9vqKTQmo2p3rkYjr3ZCppG6+Op6Jyzs7/GWNspHJkII2+zbtdjpbzE1qGelWw+7SzD5r1/My7EuajlYMBWooGrbbYUWTRx7Evb6+YviPB3dZhpqcriAlnALuejzBgQyhqS2aXAjutrQpu5GKObtvyJbLdrItJY+bquSMklN1U6 wYHNVjHw /CkR+ZSib3YQvZP1Tg5eaTzyojZeoJ7izCgL6mzO9q7QAiIgn9lzZSgDVKo4yhfQMkdZ2+bJX8geGYRflAwJHmXU/wdXfyB9PJqRPveL8m+l7GxNjeddpNxpJQp9vYTeVQENRDjplfToGiFnNHt2a3JC2VDNCmIxjPr7Dr18+fy8naZppDSyM6SJFpVdSzlaUw/Bh+KutRXRb8dgFDKSsj6+lBzXDAjBmgfNLCQa5J8LVlsQog3GdF8JttXx3becsWe3m6n2u8KiJI4Nwjru4t6CHeXzu3Wd7kByFDwvsZbpwELeDfRxXu2EE3+MRCHlb7vBeGF2BSazyXroVFlSF5hKrLw== 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 Fri, 2025-04-11 at 15:43 +1000, 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, separate > set_pte_at() > and set_pte_at_unchecked(), to allow for internal, uninstrumented > mappings. >=20 > (This series was written by Rohan McLure, who has left IBM and is no > longer > working on powerpc.) Anything more we need to get this merged? Thanks, --=20 Andrew Donnellan OzLabs, ADL Canberra ajd@linux.ibm.com IBM Australia Limited