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Fri, 16 Aug 2024 11:47:58 +0000 Message-ID: <8a73ef9c-bd37-403f-abdf-b00e8eb45236@intel.com> Date: Fri, 16 Aug 2024 19:52:11 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/4] vfio-pci support pasid attach/detach To: Vasant Hegde , Jason Gunthorpe CC: "Tian, Kevin" , Alex Williamson , "joro@8bytes.org" , "robin.murphy@arm.com" , "eric.auger@redhat.com" , "nicolinc@nvidia.com" , "kvm@vger.kernel.org" , "chao.p.peng@linux.intel.com" , "iommu@lists.linux.dev" , "baolu.lu@linux.intel.com" , "Duan, Zhenzhong" , "Pan, Jacob jun" , =?UTF-8?Q?C=C3=A9dric_Le_Goater?= , Suravee Suthikulpanit References: <20240730113517.27b06160.alex.williamson@redhat.com> <20240731110436.7a569ce0.alex.williamson@redhat.com> <20240802122528.329814a7.alex.williamson@redhat.com> <20240806142047.GN478300@nvidia.com> <0ae87b83-c936-47d2-b981-ef1e8c87f7fa@intel.com> <4f5bfba2-c1e7-4923-aa9c-59d76ccc4390@intel.com> <20240814144031.GO2032816@nvidia.com> <6f293363-1c02-4389-a6b3-7e9845b0f251@amd.com> Content-Language: en-US From: Yi Liu In-Reply-To: <6f293363-1c02-4389-a6b3-7e9845b0f251@amd.com> Content-Type: text/plain; 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>>> >>> I think it would be appropriate to add the flag here >> >> ok. >> >>> Is it OK to rely on the PCI config space PASID enable? I see all the >>> drivers right now are turning on PASID support during probe if the >>> iommu supports it. >> >> Intel side is not ready yet as it enables pasid when the device is attached >> to a non-blocking domain. I've chatted with Baolu, and he will kindly to >> enable the pasid cap in the probe_device() op if both iommu and device has >> this cap. After that, Intel side should be fine to rely on the PASID enable >> bit in the PCI config space. >> >> How about SMMU and AMD iommu side? @Jason, @Suravee, @Vasant? > > AMD driver currently discovers capability in probe_device() and enabled it in > attach_dev() path. I see. So AMD side also has a gap. Is it easy to make it suit Jason's suggestion in the above? -- Regards, Yi Liu