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

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Message-ID: <90eb1dc70909170716i5de0b909tf69c93e679f5fbc8@mail.gmail.com>
Date:	Thu, 17 Sep 2009 09:16:56 -0500
From:	Javier Guerra <javier@...rrag.com>
To:	Gregory Haskins <gregory.haskins@...il.com>
Cc:	Avi Kivity <avi@...hat.com>, "Michael S. Tsirkin" <mst@...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 Wed, Sep 16, 2009 at 10:11 PM, Gregory Haskins
<gregory.haskins@...il.com> wrote:
> It is certainly not a requirement to make said
> chip somehow work with existing drivers/facilities on bare metal, per
> se.  Why should virtual systems be different?

i'd guess it's an issue of support resources.  a hardware developer
creates a chip and immediately sells it, getting small but assured
revenue, with it they write (or pays to write) drivers for a couple of
releases, and stop to manufacture it as soon as it's not profitable.

software has a much longer lifetime, especially at the platform-level
(and KVM is a platform for a lot of us). also, being GPL, it's cheaper
to produce but has (much!) more limited resources.  creating a new
support issue is a scary thought.

-- 
Javier
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