From: Kenneth Lee <Kenneth-Lee-2012@foxmail.com>
To: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: "xieyisheng1@huawei.com" <xieyisheng1@huawei.com>,
"liubo95@huawei.com" <liubo95@huawei.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"xuzaibo@huawei.com" <xuzaibo@huawei.com>,
Will Deacon <Will.Deacon@arm.com>,
"okaya@codeaurora.org" <okaya@codeaurora.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
liguozhu@hisilicon.com, "yi.l.liu@intel.com" <yi.l.liu@intel.com>,
"ashok.raj@intel.com" <ashok.raj@intel.com>,
Jean-Philippe Brucker <jean-philippe.brucker@arm.com>,
"tn@semihalf.com" <tn@semihalf.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"bharatku@xilinx.com" <bharatku@xilinx.com>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"liudongdong3@huawei.com" <liudongdong3@huawei.com>,
"rfranz@cavium.com" <rfranz@cavium.com>,
devic
Subject: Re: [PATCH v2 03/40] iommu/sva: Manage process address spaces
Date: Sat, 26 May 2018 10:24:45 +0800 [thread overview]
Message-ID: <24808.9390145198$1527301495@news.gmane.org> (raw)
In-Reply-To: <20180525093959.000040a7@huawei.com>
On Fri, May 25, 2018 at 09:39:59AM +0100, Jonathan Cameron wrote:
> Date: Fri, 25 May 2018 09:39:59 +0100
> From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> To: Ilias Apalodimas <ilias.apalodimas@linaro.org>
> CC: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>,
> "xieyisheng1@huawei.com" <xieyisheng1@huawei.com>, "kvm@vger.kernel.org"
> <kvm@vger.kernel.org>, "linux-pci@vger.kernel.org"
> <linux-pci@vger.kernel.org>, "xuzaibo@huawei.com" <xuzaibo@huawei.com>,
> Will Deacon <Will.Deacon@arm.com>, "okaya@codeaurora.org"
> <okaya@codeaurora.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>,
> "yi.l.liu@intel.com" <yi.l.liu@intel.com>, "ashok.raj@intel.com"
> <ashok.raj@intel.com>, "tn@semihalf.com" <tn@semihalf.com>,
> "joro@8bytes.org" <joro@8bytes.org>, "robdclark@gmail.com"
> <robdclark@gmail.com>, "bharatku@xilinx.com" <bharatku@xilinx.com>,
> "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
> "liudongdong3@huawei.com" <liudongdong3@huawei.com>, "rfranz@cavium.com"
> <rfranz@cavium.com>, "devicetree@vger.kernel.org"
> <devicetree@vger.kernel.org>, "kevin.tian@intel.com"
> <kevin.tian@intel.com>, Jacob Pan <jacob.jun.pan@linux.intel.com>,
> "alex.williamson@redhat.com" <alex.williamson@redhat.com>,
> "rgummal@xilinx.com" <rgummal@xilinx.com>, "thunder.leizhen@huawei.com"
> <thunder.leizhen@huawei.com>, "linux-arm-kernel@lists.infradead.org"
> <linux-arm-kernel@lists.infradead.org>, "shunyong.yang@hxt-semitech.com"
> <shunyong.yang@hxt-semitech.com>, "dwmw2@infradead.org"
> <dwmw2@infradead.org>, "liubo95@huawei.com" <liubo95@huawei.com>,
> "jcrouse@codeaurora.org" <jcrouse@codeaurora.org>,
> "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
> Robin Murphy <Robin.Murphy@arm.com>, "christian.koenig@amd.com"
> <christian.koenig@amd.com>, "nwatters@codeaurora.org"
> <nwatters@codeaurora.org>, "baolu.lu@linux.intel.com"
> <baolu.lu@linux.intel.com>, liguozhu@hisilicon.com,
> kenneth-lee-2012@foxmail.com
> Subject: Re: [PATCH v2 03/40] iommu/sva: Manage process address spaces
> Message-ID: <20180525093959.000040a7@huawei.com>
>
> +CC Kenneth Lee
>
> On Fri, 25 May 2018 09:33:11 +0300
> Ilias Apalodimas <ilias.apalodimas@linaro.org> wrote:
>
> > On Thu, May 24, 2018 at 04:04:39PM +0100, Jean-Philippe Brucker wrote:
> > > On 24/05/18 12:50, Ilias Apalodimas wrote:
> > > >> Interesting, I hadn't thought about this use-case before. At first I
> > > >> thought you were talking about mdev devices assigned to VMs, but I think
> > > >> you're referring to mdevs assigned to userspace drivers instead? Out of
> > > >> curiosity, is it only theoretical or does someone actually need this?
> > > >
> > > > There has been some non upstreamed efforts to have mdev and produce userspace
> > > > drivers. Huawei is using it on what they call "wrapdrive" for crypto devices and
> > > > we did a proof of concept for ethernet interfaces. At the time we choose not to
> > > > involve the IOMMU for the reason you mentioned, but having it there would be
> > > > good.
> > >
> > > I'm guessing there were good reasons to do it that way but I wonder, is
> > > it not simpler to just have the kernel driver create a /dev/foo, with a
> > > standard ioctl/mmap/poll interface? Here VFIO adds a layer of
> > > indirection, and since the mediating driver has to implement these
> > > operations already, what is gained?
> > The best reason i can come up with is "common code". You already have one API
> > doing that for you so we replicate it in a /dev file?
> > The mdev approach still needs extentions to support what we tried to do (i.e
> > mdev bus might need yo have access on iommu_ops), but as far as i undestand it's
> > a possible case.
Hi, Jean, Please allow me to share my understanding here:
https://zhuanlan.zhihu.com/p/35489035
The reason we do not use the /dev/foo scheme is that the devices to be
shared are programmable accelerators. We cannot fix up the kernel driver for them.
> > >
> > > Thanks,
> > > Jean
>
>
--
-Kenneth Lee (Hisilicon)
next prev parent reply other threads:[~2018-05-26 2:24 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-11 19:06 [PATCH v2 00/40] Shared Virtual Addressing for the IOMMU Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 01/40] iommu: Introduce Shared Virtual Addressing API Jean-Philippe Brucker
2018-05-16 20:41 ` Jacob Pan
2018-05-17 10:02 ` Jean-Philippe Brucker
2018-05-17 17:00 ` Jacob Pan
2018-09-05 11:29 ` Auger Eric
2018-09-06 11:09 ` Jean-Philippe Brucker
2018-09-06 11:12 ` Christian König
2018-09-06 12:45 ` Jean-Philippe Brucker
2018-09-07 8:55 ` Christian König
2018-09-07 15:45 ` Jean-Philippe Brucker
2018-09-07 18:02 ` Christian König
2018-09-07 21:25 ` Jacob Pan
2018-09-08 7:29 ` Christian König
2018-09-12 12:40 ` Jean-Philippe Brucker
2018-09-12 12:56 ` Christian König
2018-09-13 7:15 ` Tian, Kevin
2018-09-13 7:26 ` Tian, Kevin
2018-05-11 19:06 ` [PATCH v2 02/40] iommu/sva: Bind process address spaces to devices Jean-Philippe Brucker
2018-05-17 13:10 ` Jonathan Cameron
2018-05-21 14:43 ` Jean-Philippe Brucker
2018-09-05 11:29 ` Auger Eric
2018-09-06 11:09 ` Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 03/40] iommu/sva: Manage process address spaces Jean-Philippe Brucker
2018-05-16 23:31 ` Jacob Pan
2018-05-17 10:02 ` Jean-Philippe Brucker
2018-05-22 16:43 ` Jacob Pan
2018-05-24 11:44 ` Jean-Philippe Brucker
2018-05-24 11:50 ` Ilias Apalodimas
2018-05-24 15:04 ` Jean-Philippe Brucker
2018-05-25 6:33 ` Ilias Apalodimas
2018-05-25 8:39 ` Jonathan Cameron
2018-05-26 2:24 ` Kenneth Lee
[not found] ` <20180525093959.000040a7-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2018-05-26 2:24 ` Kenneth Lee
2018-05-26 2:24 ` Kenneth Lee [this message]
[not found] ` <20180526022445.GA6069@kllp05>
2018-06-11 16:10 ` Kenneth Lee
2018-06-11 16:10 ` Kenneth Lee
2018-06-11 16:10 ` Kenneth Lee
2018-06-11 16:32 ` Kenneth Lee
2018-05-17 14:25 ` Jonathan Cameron
2018-05-21 14:44 ` Jean-Philippe Brucker
2018-09-05 12:14 ` Auger Eric
2018-09-05 18:18 ` Jacob Pan
2018-09-06 17:40 ` Jean-Philippe Brucker
2018-09-06 11:10 ` Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 04/40] iommu/sva: Add a mm_exit callback for device drivers Jean-Philippe Brucker
2018-09-05 13:23 ` Auger Eric
2018-09-06 11:10 ` Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 05/40] iommu/sva: Track mm changes with an MMU notifier Jean-Philippe Brucker
2018-05-17 14:25 ` Jonathan Cameron
2018-05-21 14:44 ` Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 06/40] iommu/sva: Search mm by PASID Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 07/40] iommu: Add a page fault handler Jean-Philippe Brucker
2018-05-17 15:25 ` Jonathan Cameron
2018-05-21 14:48 ` Jean-Philippe Brucker
2018-05-18 18:04 ` Jacob Pan
2018-05-21 14:49 ` Jean-Philippe Brucker
2018-05-22 23:35 ` Jacob Pan
2018-05-24 11:44 ` Jean-Philippe Brucker
2018-05-26 0:35 ` Jacob Pan
2018-05-29 10:00 ` Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 08/40] iommu/iopf: Handle mm faults Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 09/40] iommu/sva: Register page fault handler Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 10/40] mm: export symbol mm_access Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 11/40] mm: export symbol find_get_task_by_vpid Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 12/40] mm: export symbol mmput_async Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 13/40] vfio: Add support for Shared Virtual Addressing Jean-Philippe Brucker
2018-05-17 15:58 ` Jonathan Cameron
2018-05-21 14:51 ` Jean-Philippe Brucker
2018-05-23 9:38 ` Xu Zaibo
2018-05-24 11:44 ` Jean-Philippe Brucker
2018-05-24 12:35 ` Xu Zaibo
2018-05-24 15:04 ` Jean-Philippe Brucker
2018-05-25 2:39 ` Xu Zaibo
2018-05-25 9:47 ` Jean-Philippe Brucker
2018-05-26 3:53 ` Xu Zaibo
2018-05-29 11:55 ` Jean-Philippe Brucker
2018-05-29 12:24 ` Xu Zaibo
2018-08-27 8:06 ` Xu Zaibo
2018-08-31 13:34 ` Jean-Philippe Brucker
2018-09-01 2:23 ` Xu Zaibo
2018-09-03 10:34 ` Jean-Philippe Brucker
2018-09-04 2:12 ` Xu Zaibo
2018-09-04 10:57 ` Jean-Philippe Brucker
2018-09-05 3:15 ` Xu Zaibo
2018-09-05 11:02 ` Jean-Philippe Brucker
2018-09-06 7:26 ` Xu Zaibo
2018-05-11 19:06 ` [PATCH v2 14/40] dt-bindings: document stall and PASID properties for IOMMU masters Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 15/40] iommu/of: Add stall and pasid properties to iommu_fwspec Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 16/40] arm64: mm: Pin down ASIDs for sharing mm with devices Jean-Philippe Brucker
2018-05-15 14:16 ` Catalin Marinas
2018-05-17 10:01 ` Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 17/40] iommu/arm-smmu-v3: Link domains and devices Jean-Philippe Brucker
2018-05-17 16:07 ` Jonathan Cameron
2018-05-21 14:49 ` Jean-Philippe Brucker
2018-09-10 15:16 ` Auger Eric
2018-05-11 19:06 ` [PATCH v2 18/40] iommu/io-pgtable-arm: Factor out ARM LPAE register defines Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 19/40] iommu: Add generic PASID table library Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 20/40] iommu/arm-smmu-v3: Move context descriptor code Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 21/40] iommu/arm-smmu-v3: Add support for Substream IDs Jean-Philippe Brucker
2018-05-31 11:01 ` Bharat Kumar Gogada
2018-06-01 10:46 ` Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 22/40] iommu/arm-smmu-v3: Add second level of context descriptor table Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 23/40] iommu/arm-smmu-v3: Share process page tables Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 24/40] iommu/arm-smmu-v3: Seize private ASID Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 25/40] iommu/arm-smmu-v3: Add support for VHE Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 26/40] iommu/arm-smmu-v3: Enable broadcast TLB maintenance Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 27/40] iommu/arm-smmu-v3: Add SVA feature checking Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 28/40] iommu/arm-smmu-v3: Implement mm operations Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 29/40] iommu/arm-smmu-v3: Add support for Hardware Translation Table Update Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 30/40] iommu/arm-smmu-v3: Register I/O Page Fault queue Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 31/40] iommu/arm-smmu-v3: Improve add_device error handling Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 32/40] iommu/arm-smmu-v3: Maintain a SID->device structure Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 33/40] iommu/arm-smmu-v3: Add stall support for platform devices Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 34/40] ACPI/IORT: Check ATS capability in root complex nodes Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 35/40] iommu/arm-smmu-v3: Add support for PCI ATS Jean-Philippe Brucker
2018-05-19 17:25 ` Sinan Kaya
2018-05-21 14:52 ` Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 36/40] iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 37/40] iommu/arm-smmu-v3: Disable tagged pointers Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 38/40] PCI: Make "PRG Response PASID Required" handling common Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 39/40] iommu/arm-smmu-v3: Add support for PRI Jean-Philippe Brucker
2018-05-25 14:08 ` Bharat Kumar Gogada
2018-05-29 10:27 ` Jean-Philippe Brucker
2018-05-11 19:06 ` [PATCH v2 40/40] iommu/arm-smmu-v3: Add support for PCI PASID Jean-Philippe Brucker
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='24808.9390145198$1527301495@news.gmane.org' \
--to=kenneth-lee-2012@foxmail.com \
--cc=Jonathan.Cameron@huawei.com \
--cc=Will.Deacon@arm.com \
--cc=ashok.raj@intel.com \
--cc=bharatku@xilinx.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jean-philippe.brucker@arm.com \
--cc=joro@8bytes.org \
--cc=kvm@vger.kernel.org \
--cc=liguozhu@hisilicon.com \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-pci@vger.kernel.org \
--cc=liubo95@huawei.com \
--cc=liudongdong3@huawei.com \
--cc=okaya@codeaurora.org \
--cc=rfranz@cavium.com \
--cc=tn@semihalf.com \
--cc=xieyisheng1@huawei.com \
--cc=xuzaibo@huawei.com \
--cc=yi.l.liu@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).