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b=re3qBfXG4XyZtA/RqPxafo444qv+5COTZZvAJcsIAudJvNJ5GRUrGxzmLMht7qn04 hwCyO3Hzt2ruEpZEzwjjG5TqM57jCt7NS/wTLq9A4i30flu1luxSTT3gmO7ssNsvS2 Lb5pXFUz6XiBnwlYG8HhanlHIjmJFWfrePje/Dln8nbnfZZITOpG3X+Mc4VYGCgMtY LtRFBtuou9BEeShW+H/gLAcqTOk0FFSJQaVIa0Z6ohVZeUE9/L2qylX3UiuRgQ91sw bEWg/OKcbPZyTRB/9hC19ZqDyhbFiEikEPzuwYdJ2SVd4jtrfVeKeJap5nBj7dN4c4 1MrJJzfkPtKTQ== Date: Wed, 30 Jul 2025 12:32:15 +0300 From: Leon Romanovsky To: Jason Gunthorpe Cc: Robin Murphy , Alex Williamson , Christoph Hellwig , Andrew Morton , Bjorn Helgaas , Christian =?iso-8859-1?Q?K=F6nig?= , dri-devel@lists.freedesktop.org, iommu@lists.linux.dev, Jens Axboe , =?iso-8859-1?B?Suly9G1l?= Glisse , Joerg Roedel , kvm@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Logan Gunthorpe , Marek Szyprowski , Sumit Semwal , Vivek Kasireddy , Will Deacon Subject: Re: [PATCH 10/10] vfio/pci: Add dma-buf export support for MMIO regions Message-ID: <20250730093215.GP402218@unreal> References: <8f912671-f1d9-4f73-9c1d-e39938bfc09f@arm.com> <20250729201351.GA82395@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250729201351.GA82395@nvidia.com> X-Stat-Signature: spwawsd1eh8rqz1pyqbmbjaceau5yxkw X-Rspam-User: X-Rspamd-Queue-Id: 5FC8220016 X-Rspamd-Server: rspam02 X-HE-Tag: 1753867942-680433 X-HE-Meta: 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 z6wyAs4K IG/C1CZT9d91eJOQQ5V64KnoRkkUDG1OFMBoXxDdF11LCzP6MhVST9cAehio2svnFh+0aETsHn0y/6aegP+0a7zTJSvZsBhGuSbFgUa0gT0Y+ExnC1faryEMbyXEXOpazKkACQRhwguccE15VzY3zB28zywhzkldGPm9Mxj7TvGXW81v0CeiYUUMV2yxqCYtLQgrUchiGFKvZ4WT/UMBawtiGdFIOZRziTZJJPZHZuigBKNAtBSIudANajP+RkIgZQm+M 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 Tue, Jul 29, 2025 at 05:13:51PM -0300, Jason Gunthorpe wrote: > On Tue, Jul 29, 2025 at 08:44:21PM +0100, Robin Murphy wrote: > > > In this case with just one single > > contiguous mapping, it is clearly objectively worse to have to bounce in and > > out of the IOMMU layer 3 separate times and store a dma_map_state, > > The non-contiguous mappings are comming back, it was in earlier drafts > of this. Regardless, the point is to show how to use the general API > that we would want to bring into the DRM drivers that don't have > contiguity even though VFIO is a bit special. Yes, we will see comeback of DMA ranges in v2. Thanks