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From: "Tian, Kevin" <kevin.tian@intel.com>
To: Kenneth Lee <liguozhu@hisilicon.com>
Cc: Kenneth Lee <nek.in.cn@gmail.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"David S . Miller" <davem@davemloft.net>,
	Joerg Roedel <joro@8bytes.org>,
	Alex Williamson <alex.williamson@redhat.com>,
	Hao Fang <fanghao11@huawei.com>,
	Zhou Wang <wangzhou1@hisilicon.com>,
	Zaibo Xu <xuzaibo@huawei.com>,
	Philippe Ombredanne <pombredanne@nexb.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"linux-accelerators@lists.ozlabs.org" 
	<linux-accelerators@lists.ozlabs.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	"Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
	"linuxarm@huawei.com" <linuxarm@huawei.com>
Subject: RE: [RFC PATCH 3/7] vfio: add spimdev support
Date: Thu, 2 Aug 2018 04:24:22 +0000
Message-ID: <AADFC41AFE54684AB9EE6CBC0274A5D19129102C@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <20180802034727.GK160746@Turing-Arch-b>

> From: Kenneth Lee [mailto:liguozhu@hisilicon.com]
> Sent: Thursday, August 2, 2018 11:47 AM
> 
> >
> > > From: Kenneth Lee
> > > Sent: Wednesday, August 1, 2018 6:22 PM
> > >
> > > From: Kenneth Lee <liguozhu@hisilicon.com>
> > >
> > > SPIMDEV is "Share Parent IOMMU Mdev". It is a vfio-mdev. But differ
> from
> > > the general vfio-mdev:
> > >
> > > 1. It shares its parent's IOMMU.
> > > 2. There is no hardware resource attached to the mdev is created. The
> > > hardware resource (A `queue') is allocated only when the mdev is
> > > opened.
> >
> > Alex has concern on doing so, as pointed out in:
> >
> > 	https://www.spinics.net/lists/kvm/msg172652.html
> >
> > resource allocation should be reserved at creation time.
> 
> Yes. That is why I keep telling that SPIMDEV is not for "VM", it is for "many
> processes", it is just an access point to the process. Not a device to VM. I
> hope
> Alex can accept it:)
> 

VFIO is just about assigning device resource to user space. It doesn't care
whether it's native processes or VM using the device so far. Along the direction
which you described, looks VFIO needs to support the configuration that
some mdevs are used for native process only, while others can be used
for both native and VM. I'm not sure whether there is a clean way to
enforce it...

Let's hear from Alex's thought.

Thanks
Kevin

  reply index

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-01 10:22 [RFC PATCH 0/7] A General Accelerator Framework, WarpDrive 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 [this message]
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
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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