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[47.55.120.4]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-87d028a9a48sm87209396d6.43.2025.10.22.06.02.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Oct 2025 06:02:05 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vBYTc-00000001288-0pdQ; Wed, 22 Oct 2025 10:02:04 -0300 Date: Wed, 22 Oct 2025 10:02:04 -0300 From: Jason Gunthorpe To: Matthew Brost Cc: =?utf-8?Q?Micha=C5=82?= Winiarski , Alex Williamson , Lucas De Marchi , Thomas =?utf-8?Q?Hellstr=C3=B6m?= , Rodrigo Vivi , Yishai Hadas , Kevin Tian , Shameer Kolothum , intel-xe@lists.freedesktop.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, Michal Wajdeczko , Jani Nikula , Joonas Lahtinen , Tvrtko Ursulin , David Airlie , Simona Vetter , Lukasz Laguna Subject: Re: [PATCH 26/26] vfio/xe: Add vendor-specific vfio_pci driver for Intel graphics Message-ID: <20251022130204.GD21554@ziepe.ca> References: <20251011193847.1836454-1-michal.winiarski@intel.com> <20251011193847.1836454-27-michal.winiarski@intel.com> <20251021230328.GA21554@ziepe.ca> <20251021233811.GB21554@ziepe.ca> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Oct 21, 2025 at 06:15:19PM -0700, Matthew Brost wrote: > Ok, I think I see what you're getting at. The idea is to call > dev_set_drvdata on the Xe side, then use pci_iov_get_pf_drvdata on the > VFIO side to retrieve that data. This allows passing whatever Xe sets > via dev_set_drvdata between the module interfaces, while only > forward-declaring the interface struct in the shared header. Yes. The other email looks good: struct xe_device *xe_sriov_vfio_get_xe_device(struct pci_dev *pdev); Should call pci_iov_get_pf_drvdata() internally. And 'struct xe_device' can be a forward declared type that cannot be dereferenced by VFIO to enforce some code modularity. Using strong types is obviously better than passing around pci_dev and hoping for the best :) Jason