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From: Jason Gunthorpe <jgg@nvidia.com>
To: Parav Pandit <parav@nvidia.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	"Alex Williamson \(alex.williamson@redhat.com\)"
	<alex.williamson@redhat.com>, "Raj, Ashok" <ashok.raj@intel.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	Jonathan Corbet <corbet@lwn.net>,
	Robin Murphy <robin.murphy@arm.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Kirti Wankhede <kwankhede@nvidia.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	David Gibson <david@gibson.dropbear.id.au>,
	"Jiang, Dave" <dave.jiang@intel.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Jason Wang <jasowang@redhat.com>
Subject: Re: [RFC] /dev/ioasid uAPI proposal
Date: Mon, 31 May 2021 15:12:43 -0300	[thread overview]
Message-ID: <20210531181243.GY1002214@nvidia.com> (raw)
In-Reply-To: <PH0PR12MB5481C1B2249615257A461EEDDC3F9@PH0PR12MB5481.namprd12.prod.outlook.com>

On Mon, May 31, 2021 at 05:37:35PM +0000, Parav Pandit wrote:

> In that case, can it be a new system call? Why does it have to be under /dev/ioasid?
> For example few years back such system call mpin() thought was proposed in [1].

Reference counting of the overall pins are required

So when a pinned pages is incorporated into an IOASID page table in a
later IOCTL it means it cannot be unpinned while the IOASID page table
is using it.

This is some trick to organize the pinning into groups and then
refcount each group, thus avoiding needing per-page refcounts.

The data structure would be an interval tree of pins in general

The ioasid itself would have an interval tree of its own mappings,
each entry in this tree would reference count against an element in
the above tree

Then the ioasid's interval tree would be mapped into a page table tree
in HW format.

The redundant storages are needed to keep track of the refencing and
the CPU page table values for later unpinning.

Jason
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  reply	other threads:[~2021-05-31 18:12 UTC|newest]

Thread overview: 260+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-27  7:58 [RFC] /dev/ioasid uAPI proposal Tian, Kevin
2021-05-28  2:24 ` Jason Wang
2021-05-28 20:25   ` Jason Gunthorpe
2021-05-31  8:41   ` Liu Yi L
2021-06-01  2:36     ` Jason Wang
2021-06-01  3:31       ` Liu Yi L
2021-06-01  5:08         ` Jason Wang
2021-06-01  5:23           ` Lu Baolu
2021-06-01  5:29             ` Jason Wang
2021-06-01  5:42               ` Tian, Kevin
2021-06-01  6:07                 ` Jason Wang
2021-06-01  6:16                   ` Tian, Kevin
2021-06-01  8:47                     ` Jason Wang
2021-06-01 17:31                       ` Jason Gunthorpe
2021-06-02  8:54                         ` Jason Wang
2021-06-02 17:21                           ` Jason Gunthorpe
2021-06-07 13:30                             ` Enrico Weigelt, metux IT consult
2021-06-07 18:01                               ` Jason Gunthorpe
2021-06-08 10:45                                 ` Enrico Weigelt, metux IT consult
2021-06-10  2:16                                   ` Jason Wang
2021-06-08  1:10                             ` Jason Wang
2021-06-08 13:20                               ` Jason Gunthorpe
2021-06-10  2:00                                 ` Jason Wang
2021-06-10  4:03                                   ` Jason Wang
2021-06-10 11:47                                   ` Jason Gunthorpe
2021-06-11  5:43                                     ` Jason Wang
2021-06-01 17:29                   ` Jason Gunthorpe
2021-06-02  8:58                     ` Jason Wang
2021-06-01  4:27       ` Shenming Lu
2021-06-01  5:10         ` Jason Wang
2021-05-28 16:23 ` Jean-Philippe Brucker
2021-05-28 20:16   ` Jason Gunthorpe
2021-06-01  7:50   ` Tian, Kevin
2021-05-28 17:35 ` Jason Gunthorpe
2021-06-01  8:10   ` Tian, Kevin
2021-06-01 17:42     ` Jason Gunthorpe
2021-06-02  1:33       ` Tian, Kevin
2021-06-02 16:09         ` Jason Gunthorpe
2021-06-03  1:29           ` Tian, Kevin
2021-06-03  5:09             ` David Gibson
2021-06-03  6:49               ` Tian, Kevin
2021-06-03 11:47                 ` Jason Gunthorpe
2021-06-04  2:15                   ` Tian, Kevin
2021-06-08  0:49                 ` David Gibson
2021-06-09  2:52                   ` Tian, Kevin
2021-06-02  6:32   ` David Gibson
2021-06-02 16:16     ` Jason Gunthorpe
2021-06-03  2:11       ` Tian, Kevin
2021-06-03  5:13       ` David Gibson
2021-06-03 11:52         ` Jason Gunthorpe
2021-06-08  0:53           ` David Gibson
2021-06-08 19:04             ` Jason Gunthorpe
2021-06-17  2:42               ` David Gibson
2021-05-28 19:58 ` Jason Gunthorpe
2021-06-01  8:38   ` Tian, Kevin
2021-06-01 17:56     ` Jason Gunthorpe
2021-06-02  2:00       ` Tian, Kevin
2021-06-02  6:57       ` David Gibson
2021-06-02 16:37         ` Jason Gunthorpe
2021-06-03  5:23           ` David Gibson
2021-06-03 12:28             ` Jason Gunthorpe
2021-06-08  6:04               ` David Gibson
2021-06-08 19:23                 ` Jason Gunthorpe
2021-06-02  6:48   ` David Gibson
2021-06-02 16:58     ` Jason Gunthorpe
2021-06-03  2:49       ` Tian, Kevin
2021-06-03  5:48         ` David Gibson
2021-06-03  5:45       ` David Gibson
2021-06-03 12:11         ` Jason Gunthorpe
2021-06-04  6:08           ` Tian, Kevin
2021-06-04 12:33             ` Jason Gunthorpe
2021-06-04 23:20               ` Tian, Kevin
2021-06-08  6:13           ` David Gibson
2021-06-04 10:24         ` Jean-Philippe Brucker
2021-06-04 12:05           ` Jason Gunthorpe
2021-06-04 17:27             ` Jacob Pan
2021-06-04 17:40               ` Jason Gunthorpe
2021-06-08  6:31           ` David Gibson
2021-06-10 16:37             ` Jean-Philippe Brucker
2021-06-17  3:00               ` David Gibson
2021-06-18 17:03                 ` Jean-Philippe Brucker
2021-06-18 18:30                   ` Jason Gunthorpe
2021-06-23  8:19                     ` Tian, Kevin
2021-06-23  7:57                   ` Tian, Kevin
2021-06-24  3:49                   ` David Gibson
2021-05-28 20:03 ` Jason Gunthorpe
2021-06-01  7:01   ` Tian, Kevin
2021-06-01 20:28     ` Jason Gunthorpe
2021-06-02  1:25       ` Tian, Kevin
2021-06-02 23:27         ` Jason Gunthorpe
2021-06-04  8:17         ` Jean-Philippe Brucker
2021-06-04  8:43           ` Tian, Kevin
2021-06-02  8:52       ` Jason Wang
2021-06-02 16:07         ` Jason Gunthorpe
2021-06-01 22:22     ` Alex Williamson
2021-06-02  2:20       ` Tian, Kevin
2021-06-02 16:01         ` Jason Gunthorpe
2021-06-02 17:11           ` Alex Williamson
2021-06-02 17:35             ` Jason Gunthorpe
2021-06-02 18:01               ` Alex Williamson
2021-06-02 18:09                 ` Jason Gunthorpe
2021-06-02 19:00                   ` Alex Williamson
2021-06-02 19:54                     ` Jason Gunthorpe
2021-06-02 20:37                       ` Alex Williamson
2021-06-02 22:45                         ` Jason Gunthorpe
2021-06-03  2:50                           ` Alex Williamson
2021-06-03  3:22                             ` Tian, Kevin
2021-06-03  4:14                               ` Alex Williamson
2021-06-03  5:18                                 ` Tian, Kevin
2021-06-03 12:40                               ` Jason Gunthorpe
2021-06-03 20:41                                 ` Alex Williamson
2021-06-04  9:19                                   ` Tian, Kevin
2021-06-04 15:37                                     ` Alex Williamson
2021-06-04 12:13                                   ` Jason Gunthorpe
2021-06-04 21:45                                     ` Alex Williamson
2021-06-04  7:33                                 ` Tian, Kevin
2021-06-03 12:34                             ` Jason Gunthorpe
2021-06-03 20:01                               ` Alex Williamson
2021-06-03 20:10                                 ` Jason Gunthorpe
2021-06-03 21:44                                   ` Alex Williamson
2021-06-04  8:38                                     ` Tian, Kevin
2021-06-04 12:28                                       ` Jason Gunthorpe
2021-06-04 15:26                                         ` Alex Williamson
2021-06-04 15:40                                           ` Paolo Bonzini
2021-06-04 15:50                                             ` Jason Gunthorpe
2021-06-04 15:57                                               ` Paolo Bonzini
2021-06-04 16:03                                                 ` Jason Gunthorpe
2021-06-04 16:10                                                   ` Paolo Bonzini
2021-06-04 17:22                                                     ` Jason Gunthorpe
2021-06-04 21:29                                                       ` Alex Williamson
2021-06-04 23:01                                                         ` Jason Gunthorpe
2021-06-07 15:41                                                           ` Alex Williamson
2021-06-07 18:18                                                             ` Jason Gunthorpe
2021-06-07 18:59                                                               ` Alex Williamson
2021-06-07 19:08                                                                 ` Jason Gunthorpe
2021-06-07 19:41                                                                   ` Alex Williamson
2021-06-07 23:03                                                                     ` Jason Gunthorpe
2021-06-08  0:30                                                                       ` Alex Williamson
2021-06-08  1:20                                                                     ` Jason Wang
2021-06-30  6:53                                                                       ` Christoph Hellwig
2021-06-30  6:49                                                                   ` Christoph Hellwig
2021-06-07  3:25                                                         ` Tian, Kevin
2021-06-07  6:51                                                           ` Paolo Bonzini
2021-06-07 18:01                                                             ` Jason Gunthorpe
2021-06-30  6:56                                                           ` Christoph Hellwig
2021-06-05  6:22                                                       ` Paolo Bonzini
2021-06-07  3:50                                                         ` Tian, Kevin
2021-06-07 17:59                                                         ` Jason Gunthorpe
2021-06-08  7:56                                                           ` Paolo Bonzini
2021-06-08 13:15                                                             ` Jason Gunthorpe
2021-06-08 13:44                                                               ` Paolo Bonzini
2021-06-08 18:47                                                                 ` Alex Williamson
2021-06-08 19:00                                                                   ` Jason Gunthorpe
2021-06-09  8:51                                                                     ` Enrico Weigelt, metux IT consult
2021-06-09  9:11                                                                       ` Paolo Bonzini
2021-06-09 11:54                                                                         ` Jason Gunthorpe
2021-06-09 14:31                                                                           ` Alex Williamson
2021-06-09 14:45                                                                             ` Jason Gunthorpe
2021-06-09 15:20                                                                               ` Paolo Bonzini
2021-10-27  6:18                                                                                 ` Tian, Kevin
2021-10-27 10:32                                                                                   ` Paolo Bonzini
2021-10-28  1:50                                                                                     ` Tian, Kevin
2021-06-09  2:49                                                                   ` Tian, Kevin
2021-06-09 11:57                                                                     ` Jason Gunthorpe
2021-06-09 12:46                                                                       ` Paolo Bonzini
2021-06-09 12:47                                                                         ` Jason Gunthorpe
2021-06-09 13:24                                                                           ` Paolo Bonzini
2021-06-09 14:32                                                                             ` Jason Gunthorpe
2021-06-30  7:01                                                                           ` Christoph Hellwig
2021-06-09 18:09                                                                     ` Alex Williamson
2021-06-03  2:52                         ` Jason Wang
2021-06-03 13:09                           ` Jason Gunthorpe
2021-06-04  1:11                             ` Jason Wang
2021-06-04 11:58                               ` Jason Gunthorpe
2021-06-07  3:18                                 ` Jason Wang
2021-06-07 14:14                                   ` Jason Gunthorpe
2021-06-08  1:00                                     ` Jason Wang
2021-06-08  8:54                                       ` Enrico Weigelt, metux IT consult
2021-06-08 12:52                                         ` Jason Gunthorpe
2021-06-30  7:07                                     ` Christoph Hellwig
2021-06-30  7:05                                 ` Christoph Hellwig
2021-06-08  2:37       ` David Gibson
2021-06-08 13:17         ` Jason Gunthorpe
2021-06-17  3:47           ` David Gibson
2021-06-23  7:59             ` Tian, Kevin
2021-06-24  3:53               ` David Gibson
2021-05-28 23:36 ` Jason Gunthorpe
2021-05-31 11:31   ` Liu Yi L
2021-05-31 18:09     ` Jason Gunthorpe
2021-06-01  3:08       ` Lu Baolu
2021-06-01 17:24         ` Jason Gunthorpe
2021-06-01  1:25     ` Lu Baolu
2021-06-01 11:09   ` Lu Baolu
2021-06-01 17:26     ` Jason Gunthorpe
2021-06-02  4:01       ` Lu Baolu
2021-06-02 23:23         ` Jason Gunthorpe
2021-06-03  5:49           ` Lu Baolu
2021-06-03  5:54     ` David Gibson
2021-06-03  6:50       ` Lu Baolu
2021-06-03 12:56         ` Jason Gunthorpe
2021-06-02  7:22   ` David Gibson
2021-06-03  6:39   ` Tian, Kevin
2021-06-03 13:05     ` Jason Gunthorpe
2021-06-04  6:37       ` Tian, Kevin
2021-06-04 12:09         ` Jason Gunthorpe
2021-06-04 23:10           ` Tian, Kevin
2021-06-07 17:54             ` Jason Gunthorpe
2021-06-15  8:59       ` Tian, Kevin
2021-06-15 15:06         ` Jason Gunthorpe
2021-06-15 22:59           ` Tian, Kevin
2021-06-15 23:02             ` Jason Gunthorpe
2021-06-15 23:09               ` Tian, Kevin
2021-06-15 23:40                 ` Jason Gunthorpe
2021-06-15 23:56                   ` Tian, Kevin
2021-06-15 23:59                     ` Jason Gunthorpe
2021-06-16  0:02                       ` Tian, Kevin
2021-05-31 17:37 ` Parav Pandit
2021-05-31 18:12   ` Jason Gunthorpe [this message]
2021-06-01 12:04     ` Parav Pandit
2021-06-01 17:36       ` Jason Gunthorpe
2021-06-02  8:38   ` Enrico Weigelt, metux IT consult
2021-06-02 12:41     ` Parav Pandit
2021-06-01  4:31 ` Shenming Lu
2021-06-01  5:10   ` Lu Baolu
2021-06-01  7:15     ` Shenming Lu
2021-06-01 12:30       ` Lu Baolu
2021-06-01 13:10         ` Shenming Lu
2021-06-01 17:33         ` Jason Gunthorpe
2021-06-02  4:50           ` Shenming Lu
2021-06-03 18:19             ` Jacob Pan
2021-06-04  1:30               ` Jason Wang
2021-06-04 16:22                 ` Jacob Pan
2021-06-04 16:22                   ` Jason Gunthorpe
2021-06-04 18:05                     ` Jacob Pan
2021-06-04  2:03               ` Shenming Lu
2021-06-07 12:19                 ` Liu, Yi L
2021-06-08  1:09                   ` Shenming Lu
2021-06-01 17:30 ` Parav Pandit
2021-06-03 20:58   ` Jacob Pan
2021-06-08  6:30     ` Parav Pandit
2021-06-02  6:15 ` David Gibson
2021-06-02 17:19   ` Jason Gunthorpe
2021-06-03  3:02     ` Tian, Kevin
2021-06-03  6:26     ` David Gibson
2021-06-03 12:46       ` Jason Gunthorpe
2021-06-04  6:27         ` Tian, Kevin
2021-06-03  7:17   ` Tian, Kevin
2021-06-03 12:49     ` Jason Gunthorpe
2021-06-08  5:49     ` David Gibson
2021-06-03  8:12   ` Tian, Kevin
2021-06-17  4:07     ` David Gibson
2021-06-23  8:00       ` Tian, Kevin
2021-06-24  3:55         ` David Gibson
2021-06-02  8:56 ` Enrico Weigelt, metux IT consult
2021-06-02 17:24   ` Jason Gunthorpe
2021-06-04 10:44     ` Enrico Weigelt, metux IT consult
2021-06-04 12:30       ` Jason Gunthorpe
2021-06-08  1:15         ` David Gibson
2021-06-08 10:43         ` Enrico Weigelt, metux IT consult
2021-06-08 13:11           ` Jason Gunthorpe

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