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From: "Tian, Kevin" <kevin.tian@intel.com>
To: Jason Gunthorpe <jgg@nvidia.com>,
	David Gibson <david@gibson.dropbear.id.au>
Cc: Alex Williamson <alex.williamson@redhat.com>,
	"Liu, Yi L" <yi.l.liu@intel.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	Auger Eric <eric.auger@redhat.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Joerg Roedel <joro@8bytes.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	David Woodhouse <dwmw2@infradead.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"cgroups@vger.kernel.org" <cgroups@vger.kernel.org>,
	Tejun Heo <tj@kernel.org>, Li Zefan <lizefan@huawei.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Jean-Philippe Brucker <jean-philippe@linaro.com>,
	Jonathan Corbet <corbet@lwn.net>,
	"Raj, Ashok" <ashok.raj@intel.com>, "Wu, Hao" <hao.wu@intel.com>,
	"Jiang, Dave" <dave.jiang@intel.com>,
	"Alexey Kardashevskiy" <aik@ozlabs.ru>
Subject: RE: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs
Date: Wed, 28 Apr 2021 07:47:56 +0000	[thread overview]
Message-ID: <MWHPR11MB1886C9199AA3F00FF72ACB508C409@MWHPR11MB1886.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20210427171212.GD1370958@nvidia.com>

> From: Jason Gunthorpe <jgg@nvidia.com>
> Sent: Wednesday, April 28, 2021 1:12 AM
> 
[...]
> One option is VFIO can keep its group FD but nothing else will have
> anthing like it. However I don't much like the idea that VFIO will
> have a special and unique programming model to do that same things
> other subsystem will do. That will make it harder for userspace to
> implement.

Hi, Jason,

I have a question here. Based on discussions so far, it's clearly that the
new ioasid uAPI will differ from existing VFIO uAPI a lot, e.g. ioasid-
centric operations, no group fd, no incompatible domains, etc. Then 
I wonder how we plan to support legacy VFIO applications in this 
transition phase. Earlier you ever mentioned the desire of directly
replacing /dev/vfio/vfio with /dev/ioasid and having ioasid to present
both VFIO and new uAPI. Doesn't it imply that we have to copy the 
VFIO container/group semantics into /dev/ioasid although it's a special 
programming model only for VFIO?

Alternatively we could keep all the container/group legacy within VFIO
and having /dev/ioasid support only the new uAPI semantics. In this case
VFIO will include a shim iommu backend to connect its legacy uAPI into 
drivers/ioasid backend functions for backward compatibility. Then VFIO
will also support a new model which only uses its device uAPI to bind
to new ioasid fd w/o using any legacy container/group/iommu uAPI.
Does this sound a plan? 

Thanks
Kevin

  parent reply	other threads:[~2021-04-28  7:48 UTC|newest]

Thread overview: 269+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-27 22:01 [PATCH V4 00/18] IOASID extensions for guest SVA Jacob Pan
2021-02-27 22:01 ` [PATCH V4 01/18] docs: Document IO Address Space ID (IOASID) APIs Jacob Pan
2021-02-27 22:01 ` [PATCH V4 02/18] iommu/ioasid: Rename ioasid_set_data() Jacob Pan
2021-02-27 22:01 ` [PATCH V4 03/18] iommu/ioasid: Add a separate function for detach data Jacob Pan
2021-02-27 22:01 ` [PATCH V4 04/18] iommu/ioasid: Support setting system-wide capacity Jacob Pan
2021-02-27 22:01 ` [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs Jacob Pan
2021-03-19  0:22   ` Jacob Pan
2021-03-19  9:58     ` Jean-Philippe Brucker
2021-03-19 12:46       ` Jason Gunthorpe
2021-03-19 13:41         ` Jean-Philippe Brucker
2021-03-19 13:54           ` Jason Gunthorpe
2021-03-19 18:22             ` Jacob Pan
2021-03-22  9:24               ` Jean-Philippe Brucker
2021-03-24 17:02                 ` Jacob Pan
2021-03-24 17:03                   ` Jason Gunthorpe
2021-03-24 22:12                     ` Jacob Pan
2021-03-25 10:21                       ` Jean-Philippe Brucker
2021-03-25 17:02                         ` Jacob Pan
2021-03-25 17:16                           ` Jason Gunthorpe
2021-03-25 18:23                             ` Jacob Pan
2021-03-26  8:06                             ` Jean-Philippe Brucker
2021-03-30 13:07                               ` Jason Gunthorpe
2021-03-30 13:42                                 ` Jean-Philippe Brucker
2021-03-30 13:46                                   ` Jason Gunthorpe
2021-03-25 10:26                   ` Jean-Philippe Brucker
2021-03-22 12:03               ` Jason Gunthorpe
2021-03-24 19:05                 ` Jacob Pan
2021-03-29 16:31                   ` Jason Gunthorpe
2021-03-29 22:55                     ` Jacob Pan
2021-03-30 13:43                       ` Jason Gunthorpe
2021-03-31  0:10                         ` Jacob Pan
2021-03-31 12:28                           ` Jason Gunthorpe
2021-03-31 16:34                             ` Jacob Pan
2021-03-31 17:31                               ` Jason Gunthorpe
2021-03-31 18:20                                 ` Jacob Pan
2021-03-31 18:33                                   ` Jason Gunthorpe
2021-03-31 21:50                                     ` Jacob Pan
2021-03-31  8:38                         ` Liu, Yi L
2021-03-30  1:37                     ` Tian, Kevin
2021-03-30 13:28                       ` Jason Gunthorpe
2021-03-31  7:38                         ` Liu, Yi L
2021-03-31 12:40                           ` Jason Gunthorpe
2021-04-01  4:38                             ` Liu, Yi L
2021-04-01  7:04                               ` Liu, Yi L
2021-04-01 11:54                                 ` Jason Gunthorpe
2021-04-02 12:46                                   ` Liu, Yi L
2021-04-01 12:05                                 ` Jean-Philippe Brucker
2021-04-01 12:12                                   ` Jason Gunthorpe
2021-04-01 13:38                                   ` Liu, Yi L
2021-04-01 13:42                                     ` Jason Gunthorpe
2021-04-01 14:08                                       ` Liu, Yi L
2021-04-01 16:03                                         ` Jason Gunthorpe
2021-04-02  7:30                                           ` Tian, Kevin
2021-04-05 23:35                                             ` Jason Gunthorpe
2021-04-06  0:37                                               ` Tian, Kevin
2021-04-06 12:15                                                 ` Jason Gunthorpe
2021-04-15 13:11                                           ` Auger Eric
2021-04-15 23:07                                             ` Jason Gunthorpe
2021-04-16 13:12                                               ` Jacob Pan
2021-04-16 15:45                                                 ` Alex Williamson
2021-04-16 17:23                                                   ` Jacob Pan
2021-04-16 17:54                                                     ` Jason Gunthorpe
2021-04-21 13:18                                                   ` Liu, Yi L
2021-04-21 16:23                                                     ` Jason Gunthorpe
2021-04-21 16:54                                                       ` Alex Williamson
2021-04-21 17:52                                                         ` Jason Gunthorpe
2021-04-21 19:33                                                           ` Alex Williamson
2021-04-21 23:03                                                             ` Jason Gunthorpe
2021-04-22  8:34                                                               ` Tian, Kevin
2021-04-22 12:10                                                                 ` Jason Gunthorpe
2021-04-23  9:06                                                                   ` Tian, Kevin
2021-04-23 11:49                                                                     ` Jason Gunthorpe
2021-04-25  9:24                                                                       ` Tian, Kevin
2021-04-26 12:38                                                                         ` Jason Gunthorpe
2021-04-28  6:34                                                                           ` Tian, Kevin
2021-04-28 15:06                                                                             ` Alex Williamson
2021-05-07  7:36                                                                               ` Tian, Kevin
2021-05-07 11:56                                                                                 ` Jason Gunthorpe
2021-05-07 17:06                                                                                 ` Alex Williamson
2021-05-07 17:10                                                                                   ` Jason Gunthorpe
2021-05-08  6:08                                                                                     ` Tian, Kevin
2021-05-08  7:31                                                                                   ` Tian, Kevin
2021-05-10  2:56                                                                                     ` Lu Baolu
2021-04-28 20:46                                                                             ` Jason Gunthorpe
2021-05-04 16:22                                                                               ` Jacob Pan
2021-05-04 16:31                                                                                 ` Jason Gunthorpe
2021-05-08  5:46                                                                               ` Tian, Kevin
2021-05-04 15:41                                                                             ` Jacob Pan
2021-05-04 18:00                                                                               ` Jason Gunthorpe
2021-05-04 22:11                                                                                 ` Jacob Pan
2021-05-04 23:15                                                                                   ` Jason Gunthorpe
2021-05-05 17:22                                                                                     ` Jacob Pan
2021-05-05 18:00                                                                                       ` Jason Gunthorpe
2021-05-05 20:04                                                                                         ` Jacob Pan
2021-05-05 22:21                                                                                           ` Jason Gunthorpe
2021-05-05 23:23                                                                                             ` Raj, Ashok
2021-05-06 12:22                                                                                               ` Jason Gunthorpe
2021-05-08  7:06                                                                                             ` Liu Yi L
2021-05-06  7:23                                                                                           ` Jean-Philippe Brucker
2021-05-06 12:27                                                                                             ` Jason Gunthorpe
2021-05-06 16:32                                                                                               ` Raj, Ashok
2021-05-07 17:20                                                                                                 ` Jason Gunthorpe
2021-05-07 18:14                                                                                                   ` Raj, Ashok
2021-05-07 18:20                                                                                                     ` Jason Gunthorpe
2021-05-07 19:23                                                                                                       ` Raj, Ashok
2021-05-07 19:28                                                                                                         ` Jason Gunthorpe
2021-05-07 22:15                                                                                                           ` Jacob Pan
2021-05-08  9:56                                                                                                 ` Tian, Kevin
2021-05-10 12:37                                                                                                   ` Jason Gunthorpe
2021-05-10 15:25                                                                                                     ` Raj, Ashok
2021-05-10 15:31                                                                                                       ` Jason Gunthorpe
2021-05-10 16:22                                                                                                         ` Raj, Ashok
2021-05-10 16:39                                                                                                           ` Jason Gunthorpe
2021-05-10 22:28                                                                                                             ` Jacob Pan
2021-05-10 23:45                                                                                                               ` Jason Gunthorpe
2021-05-11  3:56                                                                                                                 ` Jacob Pan
2021-05-11  9:10                                                                                                     ` Tian, Kevin
2021-05-11 13:24                                                                                                       ` Liu Yi L
2021-05-11 22:52                                                                                                         ` Tian, Kevin
2021-05-11 14:38                                                                                                       ` Jason Gunthorpe
2021-05-11 22:51                                                                                                         ` Tian, Kevin
2021-05-11 23:39                                                                                                           ` Jason Gunthorpe
2021-05-12  0:21                                                                                                             ` Tian, Kevin
2021-05-12  0:25                                                                                                               ` Jason Gunthorpe
2021-05-12  0:40                                                                                                                 ` Tian, Kevin
2021-04-29  8:54                                                                       ` Auger Eric
2021-04-29  8:55                                                                   ` Auger Eric
2021-04-29 13:26                                                                   ` Auger Eric
2021-04-29 20:04                                                                     ` Jason Gunthorpe
2021-05-05  9:10                                                                       ` Auger Eric
2021-04-22 17:13                                                               ` Alex Williamson
2021-04-22 17:57                                                                 ` Jason Gunthorpe
2021-04-22 19:37                                                                   ` Alex Williamson
2021-04-22 20:00                                                                     ` Jason Gunthorpe
2021-04-22 22:38                                                                       ` Alex Williamson
2021-04-22 23:39                                                                         ` Jason Gunthorpe
2021-04-23 10:31                                                                           ` Tian, Kevin
2021-04-23 11:57                                                                             ` Jason Gunthorpe
2021-04-27  5:11                                                                             ` David Gibson
2021-04-27 16:39                                                                               ` Jason Gunthorpe
2021-04-28  0:49                                                                                 ` David Gibson
2021-04-23 16:38                                                                           ` Alex Williamson
2021-04-23 22:28                                                                             ` Jason Gunthorpe
2021-04-27  5:15                                                                               ` David Gibson
2021-04-27  5:08                                                                           ` David Gibson
2021-04-27 17:12                                                                             ` Jason Gunthorpe
2021-04-28  0:58                                                                               ` David Gibson
2021-04-28 14:56                                                                                 ` Jason Gunthorpe
2021-04-29  3:04                                                                                   ` David Gibson
2021-05-03 16:15                                                                                     ` Jason Gunthorpe
2021-05-13  5:48                                                                                       ` David Gibson
2021-05-13 13:59                                                                                         ` Jason Gunthorpe
2021-05-24  7:52                                                                                           ` David Gibson
2021-05-24 23:37                                                                                             ` Jason Gunthorpe
2021-05-25 19:26                                                                                               ` Kirti Wankhede
2021-05-25 19:52                                                                                                 ` Jason Gunthorpe
2021-05-25 21:18                                                                                                   ` Kirti Wankhede
2021-05-27  5:00                                                                                                     ` David Gibson
2021-05-27 18:25                                                                                                       ` Kirti Wankhede
2021-06-01  3:45                                                                                                         ` David Gibson
2021-05-27  4:58                                                                                                   ` David Gibson
2021-05-27 18:48                                                                                                     ` Jason Gunthorpe
2021-06-01  4:03                                                                                                       ` David Gibson
2021-06-01 12:57                                                                                                         ` Jason Gunthorpe
2021-06-08  0:44                                                                                                           ` David Gibson
2021-06-08 18:34                                                                                                             ` Jason Gunthorpe
2021-05-25 22:52                                                                                                 ` Alex Williamson
2021-05-26 18:10                                                                                                   ` Kirti Wankhede
2021-05-26 18:59                                                                                                     ` Alex Williamson
2021-05-26 19:13                                                                                                       ` Jason Gunthorpe
2021-05-27  4:53                                                                                               ` David Gibson
2021-05-27 19:06                                                                                                 ` Jason Gunthorpe
2021-06-01  4:27                                                                                                   ` David Gibson
2021-04-28  6:58                                                                               ` Tian, Kevin
2021-05-04 17:12                                                                                 ` Jason Gunthorpe
2021-05-07  8:09                                                                                   ` Tian, Kevin
2021-04-28  7:47                                                                               ` Tian, Kevin [this message]
2021-04-28 18:41                                                                                 ` Jason Gunthorpe
2021-04-27  4:50                                                                 ` David Gibson
2021-04-27 17:24                                                                   ` Jason Gunthorpe
2021-04-28  1:23                                                                     ` David Gibson
2021-04-29  0:21                                                                       ` Jason Gunthorpe
2021-04-29  3:20                                                                         ` David Gibson
2021-05-03 16:05                                                                           ` Jason Gunthorpe
2021-05-04  3:54                                                                             ` David Gibson
2021-05-04 18:15                                                                               ` Jason Gunthorpe
2021-05-05  4:28                                                                                 ` Alexey Kardashevskiy
2021-05-05 16:39                                                                                   ` Jason Gunthorpe
2021-05-13  6:07                                                                                     ` David Gibson
2021-05-13 13:50                                                                                       ` Jason Gunthorpe
2021-05-24  7:56                                                                                         ` David Gibson
2021-05-13  6:01                                                                                 ` David Gibson
2021-05-13  6:52                                                                                   ` Tian, Kevin
2021-05-13 13:47                                                                                   ` Jason Gunthorpe
2021-04-22 12:55                                                             ` Liu Yi L
2021-04-16 13:38                                               ` Auger Eric
2021-04-16 14:05                                                 ` Jason Gunthorpe
2021-04-16 14:26                                                   ` Auger Eric
2021-04-16 14:34                                                     ` Jason Gunthorpe
2021-04-16 15:00                                                       ` Auger Eric
2021-04-01 11:46                               ` Jason Gunthorpe
2021-04-01 13:10                                 ` Liu, Yi L
2021-04-01 13:15                                   ` Jason Gunthorpe
2021-04-01 13:43                                     ` Liu, Yi L
2021-04-01 13:46                                       ` Jason Gunthorpe
2021-04-02  7:58                                         ` Tian, Kevin
2021-04-05 23:39                                           ` Jason Gunthorpe
2021-04-06  1:02                                             ` Tian, Kevin
2021-04-06 12:21                                               ` Jason Gunthorpe
2021-04-07  2:23                                                 ` Tian, Kevin
     [not found]                                             ` <MWHPR11MB188628BDB37A4EE36F3D99338C769@MWHPR11MB1886.namprd11.prod.outlook.com>
2021-04-06  2:08                                               ` Tian, Kevin
2021-04-02 10:01                                         ` Tian, Kevin
2021-04-02  8:22                         ` Tian, Kevin
2021-04-05 23:42                           ` Jason Gunthorpe
2021-04-06  1:27                             ` Tian, Kevin
2021-04-06 12:34                               ` Jason Gunthorpe
2021-04-07  2:08                                 ` Tian, Kevin
2021-04-07 12:20                                   ` Jason Gunthorpe
2021-04-07 23:50                                     ` Tian, Kevin
2021-04-08 11:41                                       ` Jason Gunthorpe
2021-04-06  1:35                             ` Jason Wang
2021-04-06 12:42                               ` Jason Gunthorpe
2021-04-07  2:06                                 ` Jason Wang
2021-04-07  8:17                                 ` Tian, Kevin
2021-04-07 11:58                                   ` Jason Gunthorpe
2021-04-07 18:43                                   ` Jean-Philippe Brucker
2021-04-07 19:36                                     ` Jason Gunthorpe
2021-04-08  9:37                                       ` Jean-Philippe Brucker
2021-03-30  2:24                     ` Tian, Kevin
2021-03-30 13:24                       ` Jason Gunthorpe
2021-03-30  4:14                     ` Tian, Kevin
2021-03-30 13:27                       ` Jason Gunthorpe
2021-03-31  7:41                         ` Liu, Yi L
2021-03-31 12:38                           ` Jason Gunthorpe
2021-03-31 23:46                             ` Jacob Pan
2021-04-01  0:37                               ` Jason Gunthorpe
2021-04-01 17:23                                 ` Jacob Pan
2021-04-01 17:26                                   ` Jason Gunthorpe
2021-03-19 17:14       ` Jacob Pan
2021-02-27 22:01 ` [PATCH V4 06/18] iommu/ioasid: Add free function and states Jacob Pan
2021-02-27 22:01 ` [PATCH V4 07/18] iommu/ioasid: Add ioasid_set iterator helper functions Jacob Pan
2021-02-27 22:01 ` [PATCH V4 08/18] iommu/ioasid: Introduce ioasid_set private ID Jacob Pan
2021-02-27 22:01 ` [PATCH V4 09/18] iommu/ioasid: Introduce notification APIs Jacob Pan
2021-02-27 22:01 ` [PATCH V4 10/18] iommu/ioasid: Support mm token type ioasid_set notifications Jacob Pan
2021-02-27 22:01 ` [PATCH V4 11/18] iommu/ioasid: Add ownership check in guest bind Jacob Pan
2021-02-27 22:01 ` [PATCH V4 12/18] iommu/vt-d: Remove mm reference for guest SVA Jacob Pan
2021-02-27 22:01 ` [PATCH V4 13/18] iommu/ioasid: Add a workqueue for cleanup work Jacob Pan
2021-02-27 22:01 ` [PATCH V4 14/18] iommu/vt-d: Listen to IOASID notifications Jacob Pan
2021-02-27 22:01 ` [RFC PATCH 15/18] cgroup: Introduce ioasids controller Jacob Pan
2021-03-03 15:44   ` Tejun Heo
2021-03-03 21:17     ` Jacob Pan
2021-03-04  0:02       ` Jacob Pan
2021-03-04  0:23         ` Jason Gunthorpe
2021-03-04  9:49         ` Jean-Philippe Brucker
2021-03-04 17:46           ` Jacob Pan
2021-03-04 17:54             ` Jason Gunthorpe
2021-03-04 19:01               ` Jacob Pan
2021-03-04 19:02                 ` Jason Gunthorpe
2021-03-04 21:28                   ` Jacob Pan
2021-03-05  8:30             ` Jean-Philippe Brucker
2021-03-05 17:16               ` Jean-Philippe Brucker
2021-03-05 18:20               ` Jacob Pan
2021-02-27 22:01 ` [RFC PATCH 16/18] iommu/ioasid: Consult IOASIDs cgroup for allocation Jacob Pan
2021-02-27 22:01 ` [RFC PATCH 17/18] docs: cgroup-v1: Add IOASIDs controller Jacob Pan
2021-02-27 22:01 ` [RFC PATCH 18/18] ioasid: Add /dev/ioasid for userspace Jacob Pan
2021-03-10 19:23   ` Jason Gunthorpe
2021-03-11 22:55     ` Jacob Pan
2021-03-12 14:54       ` Jason Gunthorpe
2021-03-02 12:58 ` [PATCH V4 00/18] IOASID extensions for guest SVA Liu, Yi L

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