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From: Baolu Lu <baolu.lu@linux.intel.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: baolu.lu@linux.intel.com, Joerg Roedel <joro@8bytes.org>,
	Christoph Hellwig <hch@infradead.org>,
	Kevin Tian <kevin.tian@intel.com>,
	Ashok Raj <ashok.raj@intel.com>, Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.com>,
	Dave Jiang <dave.jiang@intel.com>, Vinod Koul <vkoul@kernel.org>,
	Eric Auger <eric.auger@redhat.com>, Liu Yi L <yi.l.liu@intel.com>,
	Jacob jun Pan <jacob.jun.pan@intel.com>,
	Zhangfei Gao <zhangfei.gao@linaro.org>,
	Zhu Tony <tony.zhu@intel.com>,
	iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
	Jean-Philippe Brucker <jean-philippe@linaro.org>
Subject: Re: [PATCH v10 04/12] iommu: Add attach/detach_dev_pasid iommu interface
Date: Thu, 28 Jul 2022 14:27:30 +0800	[thread overview]
Message-ID: <ccba785d-9000-09f0-7ca8-b21834924ced@linux.intel.com> (raw)
In-Reply-To: <cf370e4a-9391-4dd3-1e0a-3c7ea70d9ed2@linux.intel.com>

On 2022/7/28 10:44, Baolu Lu wrote:
>>
>> If the fabric routes PASID properly then groups are not an issue - all
>> agree on this?
> 
> I still think the singleton group is required, but it's not related to
> the PCI fabric routing discussed here.
> 
> We have a single array for PASIDs in the iommu group. All devices
> sitting in the group should share a single PASID namespace. However both
> the translation structures for IOMMU hardware or the device drivers can
> only adapt to per-device PASID namespace. Hence, it's reasonable to
> require the singleton group.

Further, conceptually, we cannot support pasid attach/detach on multi-
device groups. If multiple devices cannot be isolated, it is difficult
to ensure that their pasid spaces are isolated from each other.
Therefore, it is wrong to attach a domain to the pasid of a device. All
devices in the group must share a domain.

Best regards,
baolu

  reply	other threads:[~2022-07-28  6:27 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-05  5:06 [PATCH v10 00/12] iommu: SVA and IOPF refactoring Lu Baolu
2022-07-05  5:06 ` [PATCH v10 01/12] iommu: Add max_pasids field in struct iommu_device Lu Baolu
2022-07-23 13:57   ` Jason Gunthorpe
2022-07-31 11:54   ` Yi Liu
2022-07-31 13:33     ` Baolu Lu
2022-07-05  5:07 ` [PATCH v10 02/12] iommu: Add max_pasids field in struct dev_iommu Lu Baolu
2022-07-23 14:02   ` Jason Gunthorpe
2022-07-31 11:55   ` Yi Liu
2022-07-05  5:07 ` [PATCH v10 03/12] iommu: Remove SVM_FLAG_SUPERVISOR_MODE support Lu Baolu
2022-07-31 12:01   ` Yi Liu
2022-07-31 13:39     ` Baolu Lu
2022-07-05  5:07 ` [PATCH v10 04/12] iommu: Add attach/detach_dev_pasid iommu interface Lu Baolu
2022-07-07  1:51   ` Tian, Kevin
2022-07-23 14:11   ` Jason Gunthorpe
2022-07-24  7:03     ` Baolu Lu
2022-07-25 14:40       ` Jason Gunthorpe
2022-07-26  6:23         ` Baolu Lu
2022-07-26 13:57           ` Jason Gunthorpe
2022-07-27  3:20             ` Tian, Kevin
2022-07-27 11:53               ` Jason Gunthorpe
2022-07-28  3:06                 ` Tian, Kevin
2022-07-28 11:59                   ` Jason Gunthorpe
2022-07-29  2:49                     ` Baolu Lu
2022-07-29  2:56                       ` Tian, Kevin
2022-07-29  3:20                         ` Baolu Lu
2022-07-29  4:22                           ` Tian, Kevin
2022-07-30  6:17                             ` Baolu Lu
2022-07-29  2:51                     ` Tian, Kevin
2022-07-29 12:22                       ` Jason Gunthorpe
2022-07-30  6:23                         ` Baolu Lu
2022-07-28  2:44             ` Baolu Lu
2022-07-28  6:27               ` Baolu Lu [this message]
2022-08-02  2:19             ` Baolu Lu
2022-08-02 12:37               ` Jason Gunthorpe
2022-08-03 13:07                 ` Baolu Lu
2022-08-03 19:03                   ` Jason Gunthorpe
2022-08-04  2:03                     ` Tian, Kevin
2022-08-04  2:42                     ` Baolu Lu
2022-07-24  7:23     ` Baolu Lu
2022-07-24  8:39     ` Baolu Lu
2022-07-24  9:13     ` Baolu Lu
2022-07-25  7:46       ` Tian, Kevin
2022-07-25 10:11         ` Baolu Lu
2022-07-31 12:10   ` Yi Liu
2022-07-05  5:07 ` [PATCH v10 05/12] iommu: Add IOMMU SVA domain support Lu Baolu
2022-07-07  1:52   ` Tian, Kevin
2022-07-07  3:01     ` Baolu Lu
2022-07-23 14:15   ` Jason Gunthorpe
2022-07-31 12:19   ` Yi Liu
2022-07-05  5:07 ` [PATCH v10 06/12] iommu/vt-d: Add " Lu Baolu
2022-07-23 14:16   ` Jason Gunthorpe
2022-07-31 12:20   ` Yi Liu
2022-07-05  5:07 ` [PATCH v10 07/12] arm-smmu-v3/sva: " Lu Baolu
2022-07-23 14:20   ` Jason Gunthorpe
2022-07-24 11:58     ` Baolu Lu
2022-07-05  5:07 ` [PATCH v10 08/12] iommu/sva: Refactoring iommu_sva_bind/unbind_device() Lu Baolu
2022-07-05 17:43   ` Jean-Philippe Brucker
2022-07-07  1:56   ` Tian, Kevin
2022-07-07  3:02     ` Baolu Lu
2022-07-23 14:26   ` Jason Gunthorpe
2022-07-24 13:48     ` Baolu Lu
2022-07-25  7:39       ` Jean-Philippe Brucker
2022-07-25  8:02         ` Tian, Kevin
2022-07-25  8:47           ` Jean-Philippe Brucker
2022-07-25  9:33         ` Baolu Lu
2022-07-25  9:52           ` Jean-Philippe Brucker
2022-07-25 14:46             ` Jason Gunthorpe
2022-07-25  7:50       ` Tian, Kevin
2022-07-25 10:22         ` Baolu Lu
2022-07-25 14:47           ` Jason Gunthorpe
2022-07-26  8:47             ` Baolu Lu
2022-07-31 12:36   ` Yi Liu
2022-07-31 13:45     ` Baolu Lu
2022-07-31 12:55   ` Yi Liu
2022-07-31 13:51     ` Baolu Lu
2022-07-05  5:07 ` [PATCH v10 09/12] iommu: Remove SVA related callbacks from iommu ops Lu Baolu
2022-07-23 14:27   ` Jason Gunthorpe
2022-07-31 12:38   ` Yi Liu
2022-07-05  5:07 ` [PATCH v10 10/12] iommu: Prepare IOMMU domain for IOPF Lu Baolu
2022-07-07  1:58   ` Tian, Kevin
2022-07-23 14:33   ` Jason Gunthorpe
2022-07-24 14:04     ` Baolu Lu
2022-07-25 14:49       ` Jason Gunthorpe
2022-07-31 12:50   ` Yi Liu
2022-07-31 13:47     ` Baolu Lu
2022-07-05  5:07 ` [PATCH v10 11/12] iommu: Per-domain I/O page fault handling Lu Baolu
2022-07-07  2:06   ` Tian, Kevin
2022-07-23 14:34   ` Jason Gunthorpe
2022-07-05  5:07 ` [PATCH v10 12/12] iommu: Rename iommu-sva-lib.{c,h} Lu Baolu
2022-07-23 14:34   ` Jason Gunthorpe

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