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[47.54.130.67]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-517fb83e8e6sm156638201cf.28.2026.06.16.10.27.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Jun 2026 10:27:29 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wZXZQ-0000000GYyO-259c; Tue, 16 Jun 2026 14:27:28 -0300 Date: Tue, 16 Jun 2026 14:27:28 -0300 From: Jason Gunthorpe To: Alex Williamson Cc: Chengwen Feng , helgaas@kernel.org, wathsala.vithanage@arm.com, wei.huang2@amd.com, zhipingz@meta.com, wangzhou1@hisilicon.com, wangyushan12@huawei.com, liuyonglong@huawei.com, kvm@vger.kernel.org, linux-pci@vger.kernel.org Subject: Re: [PATCH v17 08/12] PCI/TPH: Add sysfs binary file to export CPU to steering-tag mapping Message-ID: <20260616172728.GC3577091@ziepe.ca> References: <20260616104621.41915-1-fengchengwen@huawei.com> <20260616104621.41915-9-fengchengwen@huawei.com> <20260616144224.GB3577091@ziepe.ca> <20260616105754.784be22d@shazbot.org> Precedence: bulk X-Mailing-List: linux-pci@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: <20260616105754.784be22d@shazbot.org> On Tue, Jun 16, 2026 at 10:57:54AM -0600, Alex Williamson wrote: > IMO, this implementation in sysfs more so proves that vfio is the wrong > place for the interface. vfio has a use case to consume STs, but it > doesn't produce them or own any of the mechanism by which they're > generated. I would argue only a VFIO user can consume this information so putting it in general sysfs is overkill. > The weak point is whether this bin attribute, exposing an array of > structures, fits within the socially acceptable norms of sysfs. I'm pretty sure this style of sysfs is not accepted and counter-examples are things that are ancient or slipped through. Jason