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Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Alexander Potapenko , Marco Elver , Dmitry Vyukov , Masami Hiramatsu , Mathieu Desnoyers , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux.dev, virtualization@lists.linux.dev, kasan-dev@googlegroups.com, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, Jason Gunthorpe Content-Language: en-US From: Marek Szyprowski In-Reply-To: <20250708110007.GF592765@unreal> Content-Transfer-Encoding: 8bit X-CMS-MailID: 20250708114523eucas1p2d8771c6a0d017b9bb67a6528e7582617 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20250625131920eucas1p271b196cde042bd39ac08fb12beff5baf X-EPHeader: CA X-CMS-RootMailID: 20250625131920eucas1p271b196cde042bd39ac08fb12beff5baf References: <35df6f2a-0010-41fe-b490-f52693fe4778@samsung.com> <20250627170213.GL17401@unreal> <20250630133839.GA26981@lst.de> <69b177dc-c149-40d3-bbde-3f6bad0efd0e@samsung.com> <20250708110007.GF592765@unreal> X-Stat-Signature: joefpx857pk8kiq3imktscjqrxi7ihhr X-Rspamd-Queue-Id: E774840011 X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1751975126-5867 X-HE-Meta: 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 viYvvscK t2T9I+roePQRhTSBrTmcYuf7aAU8i8y4O+hQllTvqVdpByyaaOA0NIAwddwDiUDSCrINFCJaDDYSyt/mKP+qsJ9FFJcxfBZrNbd5rP5A75BORls5QvN0Gypebh8XzbjPxHILP 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 08.07.2025 13:00, Leon Romanovsky wrote: > On Tue, Jul 08, 2025 at 12:27:09PM +0200, Marek Szyprowski wrote: >> On 30.06.2025 15:38, Christoph Hellwig wrote: >>> On Fri, Jun 27, 2025 at 08:02:13PM +0300, Leon Romanovsky wrote: >>>>> Thanks for this rework! I assume that the next step is to add map_phys >>>>> callback also to the dma_map_ops and teach various dma-mapping providers >>>>> to use it to avoid more phys-to-page-to-phys conversions. >>>> Probably Christoph will say yes, however I personally don't see any >>>> benefit in this. Maybe I wrong here, but all existing .map_page() >>>> implementation platforms don't support p2p anyway. They won't benefit >>>> from this such conversion. >>> I think that conversion should eventually happen, and rather sooner than >>> later. >> Agreed. >> >> Applied patches 1-7 to my dma-mapping-next branch. Let me know if one >> needs a stable branch with it. > Thanks a lot, I don't think that stable branch is needed. Realistically > speaking, my VFIO DMA work won't be merged this cycle, We are in -rc5, > it is complete rewrite from RFC version and touches pci-p2p code (to > remove dependency on struct page) in addition to VFIO, so it will take > time. > > Regarding, last patch (hmm), it will be great if you can take it. > We didn't touch anything in hmm.c this cycle and have no plans to send PR. > It can safely go through your tree. Okay, then I would like to get an explicit ack from Jérôme for this. >> Leon, it would be great if You could also prepare an incremental patch >> adding map_phys callback to the dma_maps_ops, so the individual >> arch-specific dma-mapping providers can be then converted (or simplified >> in many cases) too. > Sure, will do. Thanks! Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland