RE: [dpdk-dev] [PATCH 0/9] Introduce vfio-user library

From: "Xia, Chenbo" <chenbo.xia@intel.com>
To: Stephen Hemminger <stephen@networkplumber.org>,
	Thanos Makatos <thanos.makatos@nutanix.com>
Cc: David Marchand <david.marchand@redhat.com>, dev <dev@dpdk.org>,
	"Thomas Monjalon" <thomas@monjalon.net>,
	"Liang, Cunming" <cunming.liang@intel.com>,
	"Lu, Xiuchun" <xiuchun.lu@intel.com>,
	"Li, Miao" <miao.li@intel.com>,
	"Wu, Jingjing" <jingjing.wu@intel.com>,
	"john.g.johnson@oracle.com" <john.g.johnson@oracle.com>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	Marc-Andre Lureau <marcandre.lureau@redhat.com>,
	Maxime Coquelin <maxime.coquelin@redhat.com>,
	Swapnil Ingle <swapnil.ingle@nutanix.com>,
	"John Levon" <john.levon@nutanix.com>,
	"Liu, Changpeng" <changpeng.liu@intel.com>,
	Jagannathan Raman <jag.raman@oracle.com>,
	Elena Ufimtseva <elena.ufimtseva@oracle.com>
Subject: RE: [dpdk-dev] [PATCH 0/9] Introduce vfio-user library
Date: Fri, 30 Jun 2023 01:36:55 +0000	[thread overview]
Message-ID: <SN6PR11MB35045F0FE774A05488A5E32E9C2AA@SN6PR11MB3504.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20230629091024.09d98250@hermes.local>

Hi Stephen,

> -----Original Message-----
> From: Stephen Hemminger <stephen@networkplumber.org>
> Sent: Friday, June 30, 2023 12:10 AM
> To: Thanos Makatos <thanos.makatos@nutanix.com>
> Cc: David Marchand <david.marchand@redhat.com>; Xia, Chenbo
> <chenbo.xia@intel.com>; dev <dev@dpdk.org>; Thomas Monjalon
> <thomas@monjalon.net>; Liang, Cunming <cunming.liang@intel.com>; Lu,
> Xiuchun <xiuchun.lu@intel.com>; Li, Miao <miao.li@intel.com>; Wu, Jingjing
> <jingjing.wu@intel.com>; john.g.johnson@oracle.com; Stefan Hajnoczi
> <stefanha@redhat.com>; Marc-Andre Lureau <marcandre.lureau@redhat.com>;
> Maxime Coquelin <maxime.coquelin@redhat.com>; Swapnil Ingle
> <swapnil.ingle@nutanix.com>; John Levon <john.levon@nutanix.com>; Liu,
> Changpeng <changpeng.liu@intel.com>; Jagannathan Raman
> <jag.raman@oracle.com>; Elena Ufimtseva <elena.ufimtseva@oracle.com>
> Subject: Re: [dpdk-dev] [PATCH 0/9] Introduce vfio-user library
> 
> On Fri, 18 Dec 2020 14:07:20 +0000
> Thanos Makatos <thanos.makatos@nutanix.com> wrote:
> 
> > > Hello,
> > >
> > > On Fri, Dec 18, 2020 at 8:54 AM Chenbo Xia <chenbo.xia@intel.com>
> wrote:
> > > > *librte_vfio_user* library is an implementation of VFIO-over-
> socket[1]
> > > (also
> > > > known as vfio-user) which is a protocol that allows a device to be
> virtualized
> > > > in a separate process outside of QEMU.
> > >
> > > What is the status of the specification on QEMU side?
> > > Integrating an implementation in DPDK is premature until we have an
> > > agreed specification.
> >
> > We're in the process of reviewing the specification, the latest version
> (v7) is here: https://www.mail-archive.com/qemu-
> devel@nongnu.org/msg763207.html. We haven't had any reviews yet for that
> revision, IMO we're getting close.
> >
> > FYI John Johnson is implementing the relevant changes in multiprocess
> QEMU. John Levon, Swapnil, and I are implementing the server part in
> libvfio-user (formerly known as MUSER). We also have a mailing list now:
> https://lists.nongnu.org/mailman/listinfo/libvfio-user-devel. We've been
> working on integrating the two parts.
> >
> > Finally, Changpeng is implementing an NVMe controller in SPDK. We're
> trying to make it work with multiprocess QEMU and libvfio-user, we're very
> close.
> >
> >
> 
> Any status update? It has been 3 years.
> If not ready will change this patchset to state "awaiting upstream".
> I.e not ready until QEMU is ready

There is already a vfio-user lib in open source:
https://github.com/nutanix/libvfio-user

So for this lib, we may just use this libvfio-user instead of introducing
new one in DPDK, but we will still submit patches about emulating devices
in DPDK.

Thanks,
Chenbo