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b=M/jQIqzdz82x0nWSTcq4f0buV83Pk0LJSgQODn5pjrmjpwv5oy9a1d8mvYOCYdVOH bdXSPn4PgwRtO9dST3nKHT5TYXR4D0lbuq0VYMy2LK2WQ8tGkqd62MiFZw3E5YA1+V APES5GMOW46WRZWXbPOt0PFGaEfxcmpX5ZU7O9INHYCZGqFw/ylFGGERRmyWD2Q5u+ C0riJKs1eAlwPzfqs69FDmjTezmgWk9NwcQbHqxK4y8D01b28cCc7w3FT3bMoQXkso mDdwnRJk7eIzRHR57iMNUzD9DuAxsqerjLb5vvC3jhbdTL1pfEkFX8w1K57J9Sc/r3 j+tg72bbOJh1Q== Date: Wed, 23 Jul 2025 11:44:13 +0300 From: Leon Romanovsky To: Jason Gunthorpe Cc: Yonatan Maman , =?iso-8859-1?B?Suly9G1l?= Glisse , Andrew Morton , Lyude Paul , Danilo Krummrich , David Airlie , Simona Vetter , Alistair Popple , Ben Skeggs , Michael Guralnik , Or Har-Toov , Daisuke Matsuda , Shay Drory , linux-mm@kvack.org, linux-rdma@vger.kernel.org, dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 0/5] *** GPU Direct RDMA (P2P DMA) for Device Private Pages *** Message-ID: <20250723084413.GO402218@unreal> References: <20250718115112.3881129-1-ymaman@nvidia.com> <20250720103003.GH402218@unreal> <35ff6080-9cb8-43cf-b77a-9ef3afd2ae59@nvidia.com> <20250721064904.GK402218@unreal> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 8128E2000D X-Stat-Signature: yuqhkypmenk8d6msw8ae51p3tcctm3ji X-Rspam-User: X-HE-Tag: 1753260258-984276 X-HE-Meta: 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 Y5hjWRYm VVCm6RgJdqmQ0BlGAilaavOovKyEmPe9+jT6s3QdWoK/54jnw6NVlTwudhNl2kL8bdSrnkLuK4yoi7NKe+WOD1JBRW4QYYOccWK+v5aaS6jFD93dLaFXj9ZtEIENNc05gltzZc9m62hLLuw8qYRVdGwS0xENGFGB2+lHmKg6B8yXK1ASYgXTMby7tmTaycM9pJmx/N+6xW5En5zeHezV4Q/F/L7sOCu+NC4F9C5EWkXdwh3FRz1dABLziEKq+hlpAeji8 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, Jul 23, 2025 at 01:03:47AM -0300, Jason Gunthorpe wrote: > On Mon, Jul 21, 2025 at 09:49:04AM +0300, Leon Romanovsky wrote: > > > In fact, hmm_range_fault doesn't have information about the destination > > > device that will perform the DMA mapping. > > > > So probably you need to teach HMM to perform page_faults on specific device. > > That isn't how the HMM side is supposed to work, this API is just > giving the one and only P2P page that is backing the device private. I know, but somehow you need to say: "please give me p2p pages for specific device and not random device in the system as it is now". This is what is missing from my PoV. Thanks