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[156.34.48.30]) by smtp.gmail.com with ESMTPSA id n63sm2410770qka.45.2020.10.21.16.20.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 16:20:23 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kVNP4-003k7m-9M; Wed, 21 Oct 2020 20:20:22 -0300 Date: Wed, 21 Oct 2020 20:20:22 -0300 From: Jason Gunthorpe To: Daniel Vetter Subject: Re: [PATCH v3 12/16] PCI: Obey iomem restrictions for procfs mmap Message-ID: <20201021232022.GN36674@ziepe.ca> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> <20201021085655.1192025-13-daniel.vetter@ffwll.ch> <20201021125030.GK36674@ziepe.ca> <20201021151352.GL36674@ziepe.ca> <20201021163702.GM36674@ziepe.ca> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201021_192026_171057_9598AE4F X-CRM114-Status: GOOD ( 16.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390 , linux-samsung-soc , Jan Kara , Kees Cook , KVM list , Daniel Vetter , John Hubbard , LKML , DRI Development , Linux MM , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Linux PCI , Bjorn Helgaas , Daniel Vetter , Dan Williams , Andrew Morton , Linux ARM , "open list:DMA BUFFER SHARING FRAMEWORK" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Oct 21, 2020 at 09:24:08PM +0200, Daniel Vetter wrote: > On Wed, Oct 21, 2020 at 6:37 PM Jason Gunthorpe wrote: > > > > On Wed, Oct 21, 2020 at 05:54:54PM +0200, Daniel Vetter wrote: > > > > > The trouble is that io_remap_pfn adjust vma->pgoff, so we'd need to > > > split that. So ideally ->mmap would never set up any ptes. > > > > /dev/mem makes pgoff == pfn so it doesn't get changed by remap. > > > > pgoff doesn't get touched for MAP_SHARED either, so there are other > > users that could work like this - eg anyone mmaping IO memory is > > probably OK. > > I was more generally thinking for io_remap_pfn_users because of the > mkwrite use-case we might have in fbdev emulation in drm. You have a use case for MAP_PRIVATE and io_remap_pfn_range()?? Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel