netdev - Re: [net-next v2 1/1] virtual-bus: Implementation of Virtual Bus

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Date:   Sun, 24 Nov 2019 22:56:00 +0800
From:   Tiwei Bie <tiwei.bie@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, Jason Wang <jasowang@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Parav Pandit <parav@...lanox.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        Dave Ertman <david.m.ertman@...el.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, nhorman@...hat.com,
        sassmann@...hat.com, Kiran Patil <kiran.patil@...el.com>
Subject: Re: [net-next v2 1/1] virtual-bus: Implementation of Virtual Bus

On Sun, Nov 24, 2019 at 06:00:23AM -0500, Michael S. Tsirkin wrote:
> On Sat, Nov 23, 2019 at 07:09:48PM -0400, Jason Gunthorpe wrote:
> > > > > > Further, I do not think it is wise to design the userspace ABI around
> > > > > > a simplistict implementation that can't do BAR assignment,
> > > > > 
> > > > > Again, the vhost-mdev follow the VFIO ABI, no new ABI is invented, and
> > > > > mmap() was kept their for mapping device regions.
> > > > 
> > > > The patches have a new file in include/uapi.
> > > 
> > > I guess you didn't look at the code. Just to clarify, there is no
> > > new file introduced in include/uapi. Only small vhost extensions to
> > > the existing vhost uapi are involved in vhost-mdev.
> > 
> > You know, I review alot of patches every week, and sometimes I make
> > mistakes, but not this time. From the ICF cover letter:
> > 
> > https://lkml.org/lkml/2019/11/7/62
> > 
> >  drivers/vfio/mdev/mdev_core.c    |  21 ++
> >  drivers/vhost/Kconfig            |  12 +
> >  drivers/vhost/Makefile           |   3 +
> >  drivers/vhost/mdev.c             | 556 +++++++++++++++++++++++++++++++
> >  include/linux/mdev.h             |   5 +
> >  include/uapi/linux/vhost.h       |  21 ++
> >  include/uapi/linux/vhost_types.h |   8 +
> >       ^^^^^^^^^^^^^^
> > 
> > Perhaps you thought I ment ICF was adding uapi? My remarks cover all
> > three of the series involved here.
> 
> Tiwei seems to be right - include/uapi/linux/vhost.h and
> include/uapi/linux/vhost_types.h are both existing files.  vhost uapi
> extensions included here are very modest. They
> just add virtio spec things that vhost was missing.

Yeah, that's what I meant. Thanks!

> 
> Are you looking at a very old linux tree maybe?
> vhost_types.h appeared around 4.20.
> 
> -- 
> MST
>