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From: Jason Gunthorpe <jgg@nvidia.com>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: 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, 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>,
	Alex Williamson <alex.williamson@redhat.com>,
	Eric Auger <eric.auger@redhat.com>,
	Jonathan Corbet <corbet@lwn.net>, Raj Ashok <ashok.raj@intel.com>,
	"Tian, Kevin" <kevin.tian@intel.com>, Yi Liu <yi.l.liu@intel.com>,
	Wu Hao <hao.wu@intel.com>, Dave Jiang <dave.jiang@intel.com>
Subject: Re: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs
Date: Mon, 22 Mar 2021 09:03:00 -0300	[thread overview]
Message-ID: <20210322120300.GU2356281@nvidia.com> (raw)
In-Reply-To: <20210319112221.5123b984@jacob-builder>

On Fri, Mar 19, 2021 at 11:22:21AM -0700, Jacob Pan wrote:
> Hi Jason,
> 
> On Fri, 19 Mar 2021 10:54:32 -0300, Jason Gunthorpe <jgg@nvidia.com> wrote:
> 
> > On Fri, Mar 19, 2021 at 02:41:32PM +0100, Jean-Philippe Brucker wrote:
> > > On Fri, Mar 19, 2021 at 09:46:45AM -0300, Jason Gunthorpe wrote:  
> > > > On Fri, Mar 19, 2021 at 10:58:41AM +0100, Jean-Philippe Brucker wrote:
> > > >   
> > > > > Although there is no use for it at the moment (only two upstream
> > > > > users and it looks like amdkfd always uses current too), I quite
> > > > > like the client-server model where the privileged process does
> > > > > bind() and programs the hardware queue on behalf of the client
> > > > > process.  
> > > > 
> > > > This creates a lot complexity, how do does process A get a secure
> > > > reference to B? How does it access the memory in B to setup the HW?  
> > > 
> > > mm_access() for example, and passing addresses via IPC  
> > 
> > I'd rather the source process establish its own PASID and then pass
> > the rights to use it to some other process via FD passing than try to
> > go the other way. There are lots of security questions with something
> > like mm_access.
> > 
> 
> Thank you all for the input, it sounds like we are OK to remove mm argument
> from iommu_sva_bind_device() and iommu_sva_alloc_pasid() for now?
> 
> Let me try to summarize PASID allocation as below:
> 
> Interfaces	| Usage	|  Limit	| bind¹ |User visible
> /dev/ioasid²	| G-SVA/IOVA	|  cgroup	| No	|Yes
> char dev³	| SVA		|  cgroup	| Yes	|No
> iommu driver	| default PASID|  no		| No	|No
> kernel		| super SVA	| no		| yes   |No
> 
> ¹ Allocated during SVA bind
> ² PASIDs allocated via /dev/ioasid are not bound to any mm. But its
>   ownership is assigned to the process that does the allocation.

What does "not bound to a mm" mean?

IMHO a use created PASID is either bound to a mm (current) at creation
time, or it will never be bound to a mm and its page table is under
user control via /dev/ioasid.

I thought the whole point of something like a /dev/ioasid was to get
away from each and every device creating its own PASID interface?

It maybe somewhat reasonable that some devices could have some easy
'make a SVA PASID on current' interface built in, but anything more
complicated should use /dev/ioasid, and anything consuming PASID
should also have an API to import and attach a PASID from /dev/ioasid.

> Currently, the proposed /dev/ioasid interface does not map individual PASID
> with an FD. The FD is at the ioasid_set granularity and bond to the current
> mm. We could extend the IOCTLs to cover individual PASID-FD passing case
> when use cases arise. Would this work?

Is it a good idea that the FD is per ioasid_set ? What is the set used
for?

Usually kernel interfaces work nicer with a one fd/one object model.

But even if it is a set, you could pass the set between co-operating
processes and the PASID can be created in the correct 'current'. But
there is all kinds of security questsions as soon as you start doing
anything like this - is there really a use case?

Jason

  parent reply	other threads:[~2021-03-22 12:03 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 [this message]
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
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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