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[142.68.80.239]) by smtp.gmail.com with ESMTPSA id af79cd13be357-79f1902ac2esm394037485a.59.2024.07.12.05.42.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jul 2024 05:42:38 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.95) (envelope-from ) id 1sSFbh-000FUg-Ne; Fri, 12 Jul 2024 09:42:37 -0300 Date: Fri, 12 Jul 2024 09:42:37 -0300 From: Jason Gunthorpe To: Christoph Hellwig Cc: Leon Romanovsky , Jens Axboe , Robin Murphy , Joerg Roedel , Will Deacon , Keith Busch , "Zeng, Oak" , Chaitanya Kulkarni , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Andrew Morton , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API Message-ID: <20240712124237.GX14050@ziepe.ca> References: <20240705063910.GA12337@lst.de> <20240708235721.GF14050@ziepe.ca> <20240709062015.GB16180@lst.de> <20240709190320.GN14050@ziepe.ca> <20240710062212.GA25895@lst.de> <20240711232917.GR14050@ziepe.ca> <20240712045422.GA4774@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240712045422.GA4774@lst.de> X-Stat-Signature: x8bpgrsoohowsoeqhdt5fbfjw1kfugt8 X-Rspam-User: X-Rspamd-Queue-Id: 09406160009 X-Rspamd-Server: rspam02 X-HE-Tag: 1720788159-204272 X-HE-Meta: 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 DfEYzTWg VmsxEeREol9mASbQEfvgPPIKhjDCY0Cyw24E9xuec8DvsxQeVXkP8wOzzhyrrTiFUnLVDBfeOPxZKA8s3cWgLPkZZjbAy4ywQ8p8y5tScn1jmKHQNvDrPxl057Zam5if12qXu7CY2rteR390DCq4YRkOdMSLCXLfOMg8w13jlFneLAqrG58IYFjhl6JiXCF1oVeruuAQiPQHu71uZg9ZPajU/XAVj+8IOaactkUHQ2tIwNBwLLeZ0X+vWOwkDRQisHnwSJ0raYz8RR/A= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000086, 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 Fri, Jul 12, 2024 at 06:54:22AM +0200, Christoph Hellwig wrote: > This is all purely hypothetical, and I'm happy to just check for it > and reject it for it now. I do know a patch set is cooking to allow mixing ZONE_DEVICE P2P and anon memory in the same VMA ala HMM with transparent migration of ZONE_DEVICE to anon. In this situation userspace will be generating IO with no idea about any P2P/!P2P boundaries. Jason