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[156.34.48.30]) by smtp.gmail.com with ESMTPSA id o63sm432040qkd.96.2020.11.06.04.58.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Nov 2020 04:58:41 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kb1KC-000leP-L9; Fri, 06 Nov 2020 08:58:40 -0400 Date: Fri, 6 Nov 2020 08:58:40 -0400 From: Jason Gunthorpe To: Daniel Vetter Cc: John Hubbard , Christoph Hellwig , J??r??me Glisse , linux-samsung-soc , Jan Kara , Pawel Osciak , KVM list , Mauro Carvalho Chehab , LKML , DRI Development , Tomasz Figa , Linux MM , Kyungmin Park , Daniel Vetter , Andrew Morton , Marek Szyprowski , Dan Williams , Linux ARM , "open list:DMA BUFFER SHARING FRAMEWORK" Subject: Re: [PATCH v5 05/15] mm/frame-vector: Use FOLL_LONGTERM Message-ID: <20201106125840.GP36674@ziepe.ca> References: <20201104162125.GA13007@infradead.org> <20201104163758.GA17425@infradead.org> <20201104164119.GA18218@infradead.org> <20201104181708.GU36674@ziepe.ca> <20201105092524.GQ401619@phenom.ffwll.local> <20201105124950.GZ36674@ziepe.ca> <7ae3486d-095e-cf4e-6b0f-339d99709996@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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: On Fri, Nov 06, 2020 at 11:01:57AM +0100, Daniel Vetter wrote: > gpu drivers also tend to use vmf_insert_pfn* directly, so we can do > on-demand paging and move buffers around. From what I glanced for > lowest level we to the pte_mkspecial correctly (I think I convinced > myself that vm_insert_pfn does that), but for pud/pmd levels it seems > just yolo. > > remap_pfn_range seems to indeed split down to pte level always. Thats what it looked like to me too. > > From my reading, yes. See ioremap_try_huge_pmd(). > > The ioremap here shouldn't matter, since this is for kernel-internal > mappings. So that's all fine I think. Right, sorry to be unclear, we are talking about io_remap_pfn_range() which is for userspace mappings in VMAs Jason