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[185.218.66.243]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a1bd9b35a6sm140099685e9.6.2026.10.16.05.35.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 16 Oct 2026 05:35:30 -0700 (PDT) Message-ID: <230ba855-0a7a-4187-aee4-ac551c1cac76@suse.com> Date: Fri, 16 Oct 2026 15:35:28 +0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 1/4] PCI/TSM: Create MMIO descriptors via TDISP Report To: Xu Yilun Cc: Ankit Agrawal , linux-cxl@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, dave@stgolabs.net, jic23@kernel.org, dave.jiang@intel.com, alison.schofield@intel.com, vishal.l.verma@intel.com, jgg@nvidia.com, aneesh.kumar@kernel.org, aik@amd.com, iweiny@kernel.org, ming.li@zohomail.com, icheng@nvidia.com, bhelgaas@google.com, smadhavan@nvidia.com, ilpo.jarvinen@linux.intel.com, Smita.KoralahalliChannabasappa@amd.com, andriy.shevchenko@linux.intel.com, linux-coco@lists.linux.dev References: <20261005070252.84810-1-ankita@nvidia.com> <20261005070252.84810-2-ankita@nvidia.com> <7605d698-b08c-4fcb-b86b-3f79927fb0d5@suse.com> From: Nikolay Borisov Content-Language: en-US Autocrypt: addr=nik.borisov@suse.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 16.10.26 г. 14:57 ч., Xu Yilun wrote: >>> +int pci_tsm_mmio_setup(struct pci_dev *pdev, struct pci_tsm_mmio *mmio) >>> +{ >>> + int i; >>> + >>> + device_lock_assert(&pdev->dev); >>> + if (pdev->dev.driver) >>> + return -EBUSY; >>> + >>> + for (i = 0; i < mmio->nr; i++) { >>> + struct resource *res = pci_tsm_mmio_resource(mmio, i); >>> + int j; >>> + >>> + if (resource_size(res) == 0 || !(res->flags & IORESOURCE_MEM)) >>> + break; >>> + >>> + /* Only require the caller to set the range, init remainder */ >>> + *res = DEFINE_RES_NAMED_DESC(res->start, resource_size(res), >>> + pci_name(pdev), IORESOURCE_MEM, >>> + IORES_DESC_ENCRYPTED); >>> + >>> + for (j = 0; j < PCI_NUM_RESOURCES; j++) >>> + if (resource_contains(pci_resource_n(pdev, j), res)) >>> + break; >>> + >>> + /* Request is outside of device MMIO */ >>> + if (j >= PCI_NUM_RESOURCES) >>> + break; >>> + >>> + if (insert_resource(&encrypted_iomem_resource, res) != 0) >>> + break; >>> + } >>> + >>> + if (i >= mmio->nr) >>> + return 0; >> >> Shouldn't this check be if (i == mmio->nr -1 ) i.e all descriptors have been >> initialized, given the for loop condition i can ever be at most mmio->nr - 1 >> i.e the actual index of a descriptor? > > The original if (i >= mmio->nr) check is correct. Valid i is at most mmio->nr -1, > but you need an invalid i to finish the loop. Shouldn't the check strictly check for i == mmio->nr the loop terminating condition, which means "we've initialized ALL mmio resources" otherwise perform the cleanup, that '>' can never be true. While not wrong per-se having a strict check would be far clearer, no?