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[142.167.219.86]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-47ae9cf9f29sm70808611cf.71.2025.04.23.10.17.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Apr 2025 10:17:20 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1u7diq-00000007LSZ-1iS9; Wed, 23 Apr 2025 14:17:20 -0300 Date: Wed, 23 Apr 2025 14:17:20 -0300 From: Jason Gunthorpe To: Leon Romanovsky Cc: Marek Szyprowski , Jens Axboe , Christoph Hellwig , Keith Busch , Leon Romanovsky , Jake Edge , Jonathan Corbet , Zhu Yanjun , Robin Murphy , Joerg Roedel , Will Deacon , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@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, Niklas Schnelle , Chuck Lever , Luis Chamberlain , Matthew Wilcox , Dan Williams , Kanchan Joshi , Chaitanya Kulkarni Subject: Re: [PATCH v9 10/24] mm/hmm: let users to tag specific PFN with DMA mapped bit Message-ID: <20250423171720.GL1213339@ziepe.ca> References: <0a7c1e06269eee12ff8912fe0da4b7692081fcde.1745394536.git.leon@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0a7c1e06269eee12ff8912fe0da4b7692081fcde.1745394536.git.leon@kernel.org> X-Stat-Signature: xhi3s3a65bti1dh78mo7xfcgpkodniiu X-Rspamd-Queue-Id: 4644340004 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1745428642-477888 X-HE-Meta: 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 mFJWqsTi Si4DsxAxpN1ST4hz+VrdpNdekqKmhQ2Q3naUA26tCo7cvExXVzqCXOP7XhSxMFJ6ZgiEP7/0Qb1riT/BYvR9U7be/gY1mFszdbe1p9+BbgInmQgboU9R+wH3ZeGwI29bIECMPt7OL7JZguMkvabHrYLlxSAMysA5m2xeYxdi+eFna8pG9MPY+5U5dczYX3rgPpKejNUrctv2tYsEvkCEEp/ZJ0U0gKkILchDWm5INp2OJjGh9VKDttZNfKg4HnXtkZLQd5g1PZwAgEvdTttO5oWwfiJGLfnfOfh3jk+iV0GLI4bX06lKYgSFW1KaI9AFutsNBj9ldXI1xsSA2M/sS6GIXaQ== 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 Wed, Apr 23, 2025 at 11:13:01AM +0300, Leon Romanovsky wrote: > From: Leon Romanovsky > > Introduce new sticky flag (HMM_PFN_DMA_MAPPED), which isn't overwritten > by HMM range fault. Such flag allows users to tag specific PFNs with > information if this specific PFN was already DMA mapped. > > Tested-by: Jens Axboe > Reviewed-by: Christoph Hellwig > Signed-off-by: Leon Romanovsky > --- > include/linux/hmm.h | 17 +++++++++++++++ > mm/hmm.c | 51 ++++++++++++++++++++++++++++----------------- > 2 files changed, 49 insertions(+), 19 deletions(-) Reviewed-by: Jason Gunthorpe This would be part of the RDMA bits Jason