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From: Joerg Roedel <joro@8bytes.org>
To: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Cc: Lu Baolu <baolu.lu@linux.intel.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"jcrouse@codeaurora.org" <jcrouse@codeaurora.org>,
	"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
	"Jonathan.Cameron@huawei.com" <Jonathan.Cameron@huawei.com>,
	"jacob.jun.pan@linux.intel.com" <jacob.jun.pan@linux.intel.com>,
	"christian.koenig@amd.com" <christian.koenig@amd.com>,
	"eric.auger@redhat.com" <eric.auger@redhat.com>,
	"kevin.tian@intel.com" <kevin.tian@intel.com>,
	"yi.l.liu@intel.com" <yi.l.liu@intel.com>,
	Andrew Murray <Andrew.Murray@arm.com>,
	Will Deacon <Will.Deacon@arm.com>,
	Robin Murphy <Robin.Murphy@arm.com>,
	"ashok.raj@intel.com" <ashok.raj@intel.com>,
	"xuzaibo@huawei.com" <xuzaibo@huawei.com>,
	"liguozhu@hisilicon.com" <liguozhu@hisilicon.com>,
	"okaya@codeaurora.org" <okaya@codeaurora.org>,
	"bharatku@xilinx.com" <bharatku@xilinx.com>,
	"ilias.apalodimas@linaro.org" <ilias.apalodimas@linaro.org>,
	"shunyong.yang@hxt-semitech.com" <shunyong.yang@hxt-semitech.com>
Subject: Re: [PATCH v3 03/10] iommu/sva: Manage process address spaces
Date: Wed, 26 Sep 2018 14:45:27 +0200	[thread overview]
Message-ID: <20180926124527.GD18287@8bytes.org> (raw)
In-Reply-To: <754d495d-d016-f42f-5682-ba4a75a618e0@arm.com>

On Wed, Sep 26, 2018 at 11:20:34AM +0100, Jean-Philippe Brucker wrote:
> Yes, at the moment it's difficult to guess what device drivers will
> want, but I can imagine some driver offering SVA to userspace, while
> keeping a few PASIDs for themselves to map kernel memory. Or create mdev
> devices for virtualization while also allowing bare-metal SVA. So I
> think we should aim at enabling these use-cases in parallel, even if it
> doesn't necessarily need to be possible right now.

Yeah okay, but allowing these use-cases in parallel basically disallows
giving any guest control over a device's pasid-table, no?

I am just asking because I want to make up my mind about the necessary
extensions to the IOMMU-API.


Regards,

	Joerg


WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Jean-Philippe Brucker
	<jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
Cc: "kevin.tian-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org"
	<kevin.tian-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	"ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org"
	<ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	"linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"ilias.apalodimas-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
	<ilias.apalodimas-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Will Deacon <Will.Deacon-5wv7dgnIgG8@public.gmane.org>,
	"alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org"
	<alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org"
	<okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	"iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
	<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
	"liguozhu-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org"
	<liguozhu-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>,
	Robin Murphy <Robin.Murphy-5wv7dgnIgG8@public.gmane.org>,
	"christian.koenig-5C7GfCeVMHo@public.gmane.org"
	<christian.koenig-5C7GfCeVMHo@public.gmane.org>
Subject: Re: [PATCH v3 03/10] iommu/sva: Manage process address spaces
Date: Wed, 26 Sep 2018 14:45:27 +0200	[thread overview]
Message-ID: <20180926124527.GD18287@8bytes.org> (raw)
In-Reply-To: <754d495d-d016-f42f-5682-ba4a75a618e0-5wv7dgnIgG8@public.gmane.org>

On Wed, Sep 26, 2018 at 11:20:34AM +0100, Jean-Philippe Brucker wrote:
> Yes, at the moment it's difficult to guess what device drivers will
> want, but I can imagine some driver offering SVA to userspace, while
> keeping a few PASIDs for themselves to map kernel memory. Or create mdev
> devices for virtualization while also allowing bare-metal SVA. So I
> think we should aim at enabling these use-cases in parallel, even if it
> doesn't necessarily need to be possible right now.

Yeah okay, but allowing these use-cases in parallel basically disallows
giving any guest control over a device's pasid-table, no?

I am just asking because I want to make up my mind about the necessary
extensions to the IOMMU-API.


Regards,

	Joerg

  reply	other threads:[~2018-09-26 12:45 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-20 17:00 [PATCH v3 00/10] Shared Virtual Addressing for the IOMMU Jean-Philippe Brucker
2018-09-20 17:00 ` Jean-Philippe Brucker
2018-09-20 17:00 ` [PATCH v3 01/10] iommu: Introduce Shared Virtual Addressing API Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
     [not found]   ` <20180920170046.20154-2-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2018-09-23  2:39     ` Lu Baolu
2018-09-24 12:07       ` Jean-Philippe Brucker
2018-09-24 12:07         ` Jean-Philippe Brucker
2018-09-25 13:16       ` Joerg Roedel
2018-09-25 13:16         ` Joerg Roedel
2018-09-25 22:46         ` Jacob Pan
2018-09-25 22:46           ` Jacob Pan
2018-09-26 10:14           ` Jean-Philippe Brucker
2018-09-26 10:14             ` Jean-Philippe Brucker
2018-09-26 12:48           ` Joerg Roedel
2018-09-26 12:48             ` Joerg Roedel
2018-09-20 17:00 ` [PATCH v3 02/10] iommu/sva: Bind process address spaces to devices Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
2018-09-23  3:05   ` Lu Baolu
2018-09-23  3:05     ` Lu Baolu
2018-09-24 12:07     ` Jean-Philippe Brucker
2018-09-24 12:07       ` Jean-Philippe Brucker
2018-09-26 18:01       ` Jacob Pan
2018-09-26 18:01         ` Jacob Pan
2018-09-27 15:06         ` Jean-Philippe Brucker
2018-09-27 15:06           ` Jean-Philippe Brucker
2018-09-28  1:14           ` Tian, Kevin
2018-09-28  1:14             ` Tian, Kevin
2018-09-20 17:00 ` [PATCH v3 03/10] iommu/sva: Manage process address spaces Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
2018-09-25  3:15   ` Lu Baolu
2018-09-25  3:15     ` Lu Baolu
2018-09-25 10:32     ` Jean-Philippe Brucker
2018-09-25 10:32       ` Jean-Philippe Brucker
2018-09-26  3:12       ` Lu Baolu
2018-09-26  3:12         ` Lu Baolu
2018-09-25 13:26     ` Joerg Roedel
2018-09-25 13:26       ` Joerg Roedel
2018-09-25 23:33       ` Lu Baolu
2018-09-25 23:33         ` Lu Baolu
2018-09-26 10:20         ` Jean-Philippe Brucker
2018-09-26 10:20           ` Jean-Philippe Brucker
2018-09-26 12:45           ` Joerg Roedel [this message]
2018-09-26 12:45             ` Joerg Roedel
2018-09-26 13:50             ` Jean-Philippe Brucker
2018-09-26 13:50               ` Jean-Philippe Brucker
2018-09-27  3:22               ` Liu, Yi L
2018-09-27  3:22                 ` Liu, Yi L
2018-09-27 13:37                 ` Jean-Philippe Brucker
2018-09-27 13:37                   ` Jean-Philippe Brucker
2018-10-08  8:29                   ` Liu, Yi L
2018-10-08  8:29                     ` Liu, Yi L
2018-09-26 22:58             ` Jacob Pan
2018-09-26 22:58               ` Jacob Pan
2018-09-26 22:35   ` Jacob Pan
2018-09-26 22:35     ` Jacob Pan
2018-10-03 17:52     ` Jean-Philippe Brucker
2018-10-03 17:52       ` Jean-Philippe Brucker
2018-10-15 20:53       ` Jacob Pan
2018-10-15 20:53         ` Jacob Pan
2018-09-20 17:00 ` [PATCH v3 04/10] iommu/sva: Add a mm_exit callback for device drivers Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
2018-09-20 17:00 ` [PATCH v3 05/10] iommu/sva: Track mm changes with an MMU notifier Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
2018-09-20 17:00 ` [PATCH v3 06/10] iommu/sva: Search mm by PASID Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
2018-09-25  4:59   ` Lu Baolu
2018-09-25  4:59     ` Lu Baolu
2018-09-20 17:00 ` [PATCH v3 07/10] iommu: Add a page fault handler Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
2018-09-27 20:37   ` Jacob Pan
2018-09-27 20:37     ` Jacob Pan
2018-10-03 17:46     ` Jean-Philippe Brucker
2018-10-03 17:46       ` Jean-Philippe Brucker
2018-09-20 17:00 ` [PATCH v3 08/10] iommu/iopf: Handle mm faults Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
2018-09-20 17:00 ` [PATCH v3 09/10] iommu/sva: Register page fault handler Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
2018-09-20 17:00 ` [RFC PATCH v3 10/10] iommu/sva: Add support for private PASIDs Jean-Philippe Brucker
2018-09-20 17:00   ` Jean-Philippe Brucker
2018-10-12 14:32   ` Jordan Crouse
2018-10-12 14:32     ` Jordan Crouse
2018-10-17 14:21     ` Jean-Philippe Brucker
2018-10-17 14:21       ` Jean-Philippe Brucker
2018-10-17 14:24       ` Jean-Philippe Brucker
2018-10-17 14:24         ` Jean-Philippe Brucker
2018-10-17 15:07       ` Jordan Crouse
2018-10-17 15:07         ` Jordan Crouse

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