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Tue, 11 Jul 2023 09:07:08 +0000 (GMT) Message-ID: <8cfc3eef-e387-88e1-1006-2d7d97a09213@linux.ibm.com> Date: Tue, 11 Jul 2023 11:07:06 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH v5 00/38] New page table range API To: "Matthew Wilcox (Oracle)" , Andrew Morton , Claudio Imbrenda Cc: linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Gerald Schaefer , linux-s390 References: <20230710204339.3554919-1-willy@infradead.org> Content-Language: en-US From: Christian Borntraeger In-Reply-To: <20230710204339.3554919-1-willy@infradead.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: yWhAr4gPvnS30Ln_V4ohQeR9uQatdToz X-Proofpoint-ORIG-GUID: yWhAr4gPvnS30Ln_V4ohQeR9uQatdToz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-11_04,2023-07-06_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 spamscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 clxscore=1011 impostorscore=0 mlxlogscore=490 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2307110080 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 7837BC000F X-Stat-Signature: g8h6y6kbzwyb4huhwepnrpd8m6kwz7hc X-Rspam-User: X-HE-Tag: 1689066443-78289 X-HE-Meta: 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 Hz43Aawb FZBflDqx07qp9XXiDVtZk6I1uGXJYS1eBZmy4nLJWfP8KKRHdscM2MRIxSOTyCo1Bo6DWMMN8kfyor4OyV5qXlzSZuH1k6z2YDf9AxEK0/IWwIjD7HJFcRn9lMOHmN7erw2h8 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: Am 10.07.23 um 22:43 schrieb Matthew Wilcox (Oracle): > This patchset changes the API used by the MM to set up page table entries. > The four APIs are: > set_ptes(mm, addr, ptep, pte, nr) > update_mmu_cache_range(vma, addr, ptep, nr) > flush_dcache_folio(folio) > flush_icache_pages(vma, page, nr) > > flush_dcache_folio() isn't technically new, but no architecture > implemented it, so I've done that for them. The old APIs remain around > but are mostly implemented by calling the new interfaces. > > The new APIs are based around setting up N page table entries at once. > The N entries belong to the same PMD, the same folio and the same VMA, > so ptep++ is a legitimate operation, and locking is taken care of for > you. Some architectures can do a better job of it than just a loop, > but I have hesitated to make too deep a change to architectures I don't > understand well. > > One thing I have changed in every architecture is that PG_arch_1 is now a > per-folio bit instead of a per-page bit. This was something that would > have to happen eventually, and it makes sense to do it now rather than > iterate over every page involved in a cache flush and figure out if it > needs to happen. I think we do use PG_arch_1 on s390 for our secure page handling and making this perf folio instead of physical page really seems wrong and it probably breaks this code. Claudio, can you have a look?