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

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Date:   Tue, 19 Nov 2019 16:33:40 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Jason Wang <jasowang@...hat.com>,
        Parav Pandit <parav@...lanox.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Dave Ertman <david.m.ertman@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        Kiran Patil <kiran.patil@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Bie, Tiwei" <tiwei.bie@...el.com>
Subject: Re: [net-next v2 1/1] virtual-bus: Implementation of Virtual Bus

On Tue, Nov 19, 2019 at 03:15:47PM -0400, Jason Gunthorpe wrote:
> On Tue, Nov 19, 2019 at 01:58:42PM -0500, Michael S. Tsirkin wrote:
> > On Tue, Nov 19, 2019 at 12:46:32PM -0400, Jason Gunthorpe wrote:
> > > As always, this is all very hard to tell without actually seeing real
> > > accelerated drivers implement this. 
> > > 
> > > Your patch series might be a bit premature in this regard.
> > 
> > Actually drivers implementing this have been posted, haven't they?
> > See e.g. https://lwn.net/Articles/804379/
> 
> Is that a real driver? It looks like another example quality
> thing. 
> 
> For instance why do we need any of this if it has '#define
> IFCVF_MDEV_LIMIT 1' ?
> 
> Surely for this HW just use vfio over the entire PCI function and be
> done with it?
> 
> Jason

What this does is allow using it with unmodified virtio drivers within guests.
You won't get this with passthrough as it only implements parts of
virtio in hardware.

-- 
MST