netdev - Re: [PATCHv5 3/3] vhost_net: a kernel-level virtio server

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Message-ID: <20090915213854.GE27954@redhat.com>
Date:	Wed, 16 Sep 2009 00:38:54 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Gregory Haskins <gregory.haskins@...il.com>
Cc:	Avi Kivity <avi@...hat.com>,
	"Ira W. Snyder" <iws@...o.caltech.edu>, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu, linux-mm@...ck.org,
	akpm@...ux-foundation.org, hpa@...or.com,
	Rusty Russell <rusty@...tcorp.com.au>, s.hetze@...ux-ag.com,
	alacrityvm-devel@...ts.sourceforge.net
Subject: Re: [PATCHv5 3/3] vhost_net: a kernel-level virtio server

On Tue, Sep 15, 2009 at 05:39:27PM -0400, Gregory Haskins wrote:
> Michael S. Tsirkin wrote:
> > On Tue, Sep 15, 2009 at 04:43:58PM -0400, Gregory Haskins wrote:
> >> Michael S. Tsirkin wrote:
> >>> On Tue, Sep 15, 2009 at 04:08:23PM -0400, Gregory Haskins wrote:
> >>>> No, what I mean is how do you surface multiple ethernet and consoles to
> >>>> the guests?  For Ira's case, I think he needs at minimum at least one of
> >>>> each, and he mentioned possibly having two unique ethernets at one point.
> >>>>
> >>>> His slave boards surface themselves as PCI devices to the x86
> >>>> host.  So how do you use that to make multiple vhost-based devices (say
> >>>> two virtio-nets, and a virtio-console) communicate across the transport?
> >>>>
> >>>> There are multiple ways to do this, but what I am saying is that
> >>>> whatever is conceived will start to look eerily like a vbus-connector,
> >>>> since this is one of its primary purposes ;)
> >>> Can't all this be in userspace?
> >> Can you outline your proposal?
> >>
> >> -Greg
> >>
> > 
> > Userspace in x86 maps a PCI region, uses it for communication with ppc?
> > 
> 
> And what do you propose this communication to look like?

Who cares? Implement vbus protocol there if you like.

> -Greg
> 


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