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From: Kenneth Lee <liguozhu@hisilicon.com>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: Jerome Glisse <jglisse@redhat.com>,
	Kenneth Lee <nek.in.cn@gmail.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	Jonathan Corbet <corbet@lwn.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Zaibo Xu <xuzaibo@huawei.com>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
	Hao Fang <fanghao11@huawei.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linuxarm@huawei.com" <linuxarm@huawei.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
	"Philippe Ombredanne" <pombredanne@nexb.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"David S . Miller" <davem@davemloft.net>,
	"linux-accelerators@lists.ozlabs.org" 
	<linux-accelerators@lists.ozlabs.org>
Subject: Re: [RFC PATCH 0/7] A General Accelerator Framework, WarpDrive
Date: Fri, 10 Aug 2018 09:37:40 +0800
Message-ID: <20180810013740.GJ91035@Turing-Arch-b> (raw)
In-Reply-To: <AADFC41AFE54684AB9EE6CBC0274A5D1912B39B3@SHSMSX101.ccr.corp.intel.com>

On Thu, Aug 09, 2018 at 08:31:31AM +0000, Tian, Kevin wrote:
> Date: Thu, 9 Aug 2018 08:31:31 +0000
> From: "Tian, Kevin" <kevin.tian@intel.com>
> To: Kenneth Lee <liguozhu@hisilicon.com>, Jerome Glisse <jglisse@redhat.com>
> CC: Kenneth Lee <nek.in.cn@gmail.com>, Alex Williamson
>  <alex.williamson@redhat.com>, Herbert Xu <herbert@gondor.apana.org.au>,
>  "kvm@vger.kernel.org" <kvm@vger.kernel.org>, Jonathan Corbet
>  <corbet@lwn.net>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Zaibo
>  Xu <xuzaibo@huawei.com>, "linux-doc@vger.kernel.org"
>  <linux-doc@vger.kernel.org>, "Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
>  Hao Fang <fanghao11@huawei.com>, "linux-kernel@vger.kernel.org"
>  <linux-kernel@vger.kernel.org>, "linuxarm@huawei.com"
>  <linuxarm@huawei.com>, "iommu@lists.linux-foundation.org"
>  <iommu@lists.linux-foundation.org>, "linux-crypto@vger.kernel.org"
>  <linux-crypto@vger.kernel.org>, Philippe Ombredanne
>  <pombredanne@nexb.com>, Thomas Gleixner <tglx@linutronix.de>, "David S .
>  Miller" <davem@davemloft.net>, "linux-accelerators@lists.ozlabs.org"
>  <linux-accelerators@lists.ozlabs.org>
> Subject: RE: [RFC PATCH 0/7] A General Accelerator Framework, WarpDrive
> Message-ID: <AADFC41AFE54684AB9EE6CBC0274A5D1912B39B3@SHSMSX101.ccr.corp.intel.com>
> 
> > From: Kenneth Lee [mailto:liguozhu@hisilicon.com]
> > Sent: Thursday, August 9, 2018 4:04 PM
> > 
> > But we have another requirement which is to combine some device
> > together to
> > share the same address space. This is a little like these kinds of solution:
> > 
> > http://tce.technion.ac.il/wp-content/uploads/sites/8/2015/06/SC-7.2-M.-
> > Silberstein.pdf
> > 
> > With that, the application can directly pass the NiC packet pointer to the
> > decryption accelerator, and get the bare data in place. This is the feature
> > that
> > the VFIO container can provide.
> 
> above is not a good argument, at least in the context of your discussion.
> If each device has their own interface (similar to GPU) for process to bind 
> with, then having the process binding to multiple devices one-by-one then
> you still get same address space shared cross them...

If we consider this from the VFIO container perspective, with a container, you
can do DMA to the container applying it to all devices, even the device is added
after the DMA operation.  

So your argument remains true only when SVM is enabled and the whole process space
is devoted to the devices. 

Yes, the process can do the same all by itself. But if we agree with that, it
makes no sense to keep the container concept in VFIO;)

> 
> Thanks
> Kevin

-- 
			-Kenneth(Hisilicon)

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  reply index

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-01 10:22 Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 1/7] vfio/spimdev: Add documents for WarpDrive framework Kenneth Lee
2018-08-02  3:14   ` Tian, Kevin
2018-08-02  4:22     ` Kenneth Lee
2018-08-02  4:41       ` Tian, Kevin
2018-08-06 12:27   ` Pavel Machek
2018-08-08  1:43     ` Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 2/7] iommu: Add share domain interface in iommu for spimdev Kenneth Lee
2018-08-02  3:17   ` Tian, Kevin
2018-08-02  4:15     ` Kenneth Lee
2018-08-02  4:39       ` Tian, Kevin
2018-08-08  9:13   ` Joerg Roedel
2018-08-09  1:09     ` Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 3/7] vfio: add spimdev support Kenneth Lee
2018-08-01 16:23   ` Randy Dunlap
2018-08-02  3:07     ` Kenneth Lee
2018-08-02  3:21   ` Tian, Kevin
2018-08-02  3:47     ` Kenneth Lee
2018-08-02  4:24       ` Tian, Kevin
2018-08-02  7:34         ` Kenneth Lee
     [not found]           ` <20180802103528.0b863030.cohuck@redhat.com>
     [not found]             ` <20180802124327.403b10ab@t450s.home>
2018-08-06  1:40               ` Kenneth Lee
2018-08-06 15:49                 ` Alex Williamson
2018-08-06 16:34                   ` Raj, Ashok
2018-08-06 17:05                     ` Alex Williamson
2018-08-08  1:32                       ` Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 4/7] crypto: add hisilicon Queue Manager driver Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 5/7] crypto: Add Hisilicon Zip driver Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 6/7] crypto: add spimdev support to Hisilicon QM Kenneth Lee
2018-08-01 10:22 ` [RFC PATCH 7/7] vfio/spimdev: add user sample for spimdev Kenneth Lee
2018-08-01 16:56 ` [RFC PATCH 0/7] A General Accelerator Framework, WarpDrive Jerome Glisse
2018-08-02  2:33   ` Tian, Kevin
2018-08-02  4:05     ` Kenneth Lee
2018-08-02 14:22       ` Jerome Glisse
2018-08-03  3:47         ` Kenneth Lee
2018-08-03 14:39           ` Jerome Glisse
2018-08-06  3:12             ` Kenneth Lee
2018-08-06 15:32               ` Jerome Glisse
2018-08-08  1:08                 ` Kenneth Lee
2018-08-08 15:18                   ` Jerome Glisse
2018-08-09  8:03                     ` Kenneth Lee
2018-08-09  8:31                       ` Tian, Kevin
2018-08-10  1:37                         ` Kenneth Lee [this message]
2018-08-09 14:46                       ` Jerome Glisse
2018-08-10  3:39                         ` Kenneth Lee
2018-08-10 13:12                           ` Jean-Philippe Brucker
2018-08-11 15:26                             ` Kenneth Lee
2018-08-13  9:29                               ` Kenneth Lee
2018-08-13 19:23                                 ` Jerome Glisse
2018-08-14  3:46                                   ` Kenneth Lee
2018-08-10 14:32                           ` Jerome Glisse
2018-08-11 14:44                             ` Kenneth Lee
2018-08-02 10:10     ` Alan Cox
2018-08-02 12:24       ` Xu Zaibo
2018-08-02 14:46       ` Jerome Glisse
2018-08-03 14:20         ` Alan Cox
2018-08-03 14:55           ` Jerome Glisse
2018-08-06  1:26           ` Kenneth Lee
2018-08-02  2:59 ` Tian, Kevin
2018-08-02  3:40   ` Kenneth Lee
2018-08-02  4:36     ` Tian, Kevin
2018-08-02  5:35       ` Kenneth Lee

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