From: Jason Gunthorpe <jgg@nvidia.com>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Joerg Roedel <joro@8bytes.org>,
Christoph Hellwig <hch@infradead.org>,
Lu Baolu <baolu.lu@linux.intel.com>,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
"Pan, Jacob jun" <jacob.jun.pan@intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
"Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
"Jiang, Dave" <dave.jiang@intel.com>,
"Zanussi, Tom" <tom.zanussi@intel.com>,
"Williams, Dan J" <dan.j.williams@intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
"Liu, Yi L" <yi.l.liu@intel.com>
Subject: Re: [PATCH v2 3/8] iommu/vt-d: Implement device_pasid domain attach ops
Date: Wed, 16 Mar 2022 21:04:10 -0300 [thread overview]
Message-ID: <20220317000410.GU11336@nvidia.com> (raw)
In-Reply-To: <17d73d88e08047f09636cf39edd69892@intel.com>
On Wed, Mar 16, 2022 at 10:23:26PM +0000, Luck, Tony wrote:
> Kernel users (ring0) can supply any PASID when they use
> the ENQCMDS instruction. Is that what you mean when you
> say "real applications"?
I'm not talking about ENQCMD at all
I'm saying I don't see much utility to have two PASIDs assigned to the
same device that perform the same IOVA translation.
So I would expect the list of attachments in an iommu_domain to have
exactly one device in it and multiple PASIDs to the same device from
the same iommu_domain is a oddball corner case we don't need to
optimize for, beyond being able to allow it to happen.
Jason
next prev parent reply other threads:[~2022-03-17 0:04 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-15 5:07 [PATCH v2 0/8] Enable PASID for DMA API users Jacob Pan
2022-03-15 5:07 ` [PATCH v2 1/8] iommu: Assign per device max PASID Jacob Pan
2022-03-15 5:07 ` [PATCH v2 2/8] iommu: Add attach/detach_dev_pasid domain ops Jacob Pan
2022-03-15 10:24 ` Tian, Kevin
2022-03-15 11:26 ` Jean-Philippe Brucker
2022-03-15 11:49 ` Tian, Kevin
2022-03-15 16:11 ` Jacob Pan
2022-03-18 12:01 ` Lu Baolu
2022-03-18 13:50 ` Jason Gunthorpe
2022-03-18 11:52 ` Lu Baolu
2022-03-18 13:48 ` Jason Gunthorpe
2022-03-15 5:07 ` [PATCH v2 3/8] iommu/vt-d: Implement device_pasid domain attach ops Jacob Pan
2022-03-15 10:33 ` Tian, Kevin
2022-03-15 22:23 ` Jacob Pan
2022-03-15 14:33 ` Jason Gunthorpe
2022-03-15 22:36 ` Jacob Pan
2022-03-15 23:04 ` Jason Gunthorpe
2022-03-16 20:50 ` Jacob Pan
2022-03-16 22:15 ` Jason Gunthorpe
2022-03-16 22:23 ` Luck, Tony
2022-03-17 0:04 ` Jason Gunthorpe [this message]
2022-03-18 5:47 ` Tian, Kevin
2022-03-18 13:47 ` Jason Gunthorpe
2022-03-17 0:49 ` Jacob Pan
2022-03-17 13:23 ` Jason Gunthorpe
2022-03-17 18:23 ` Jacob Pan
2022-03-16 7:41 ` Tian, Kevin
2022-03-16 21:01 ` Jacob Pan
2022-03-18 5:33 ` Tian, Kevin
2022-03-28 21:41 ` Jacob Pan
2022-03-16 7:39 ` Tian, Kevin
2022-03-16 20:51 ` Jacob Pan
2022-03-15 5:07 ` [PATCH v2 4/8] iommu/vt-d: Use device_pasid attach op for RID2PASID Jacob Pan
2022-03-16 7:54 ` Tian, Kevin
2022-03-17 20:45 ` Jacob Pan
2022-03-15 5:07 ` [PATCH v2 5/8] iommu: Add PASID support for DMA mapping API users Jacob Pan
2022-03-15 11:16 ` Robin Murphy
2022-03-15 14:22 ` Jason Gunthorpe
2022-03-15 16:31 ` Jacob Pan
2022-03-15 17:05 ` Jason Gunthorpe
2022-03-15 21:24 ` Jacob Pan
2022-03-16 10:32 ` Tian, Kevin
2022-03-16 8:41 ` Tian, Kevin
2022-03-16 14:07 ` Jason Gunthorpe
2022-03-15 14:35 ` Jason Gunthorpe
2022-03-15 16:38 ` Jacob Pan
2022-03-15 23:05 ` Jason Gunthorpe
2022-03-18 12:43 ` Lu Baolu
2022-03-28 21:44 ` Jacob Pan
2022-03-15 5:07 ` [PATCH v2 6/8] dmaengine: idxd: Use DMA API for in-kernel DMA with PASID Jacob Pan
2022-03-18 6:10 ` Tian, Kevin
2022-03-29 17:39 ` Jacob Pan
2022-03-15 5:07 ` [PATCH v2 7/8] iommu/vt-d: Delete supervisor/kernel SVA Jacob Pan
2022-03-18 6:16 ` Tian, Kevin
2022-03-29 17:42 ` Jacob Pan
2022-03-15 5:07 ` [PATCH v2 8/8] iommu: Remove unused driver data in sva_bind_device Jacob Pan
2022-03-15 11:37 ` Jean-Philippe Brucker
2022-03-15 5:07 ` [PATCH v2 9/9] dmaengine: idxd: separate user and kernel pasid enabling Jacob Pan
2022-03-18 6:28 ` Tian, Kevin
2022-03-15 8:16 ` [PATCH v2 0/8] Enable PASID for DMA API users Tian, Kevin
2022-03-15 15:49 ` Jacob Pan
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