linux-kernel - Re: [PATCH 0/3] virtio-net: inline header support

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Message-ID: <20121012135258.75ca3310@BR9GNB5Z>
Date:	Fri, 12 Oct 2012 13:52:58 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sasha Levin <levinsasha928@...il.com>,
	virtualization@...ts.linux-foundation.org,
	Thomas Lendacky <tahm@...ux.vnet.ibm.com>, avi@...hat.com
Subject: Re: [PATCH 0/3] virtio-net: inline header support

On Fri, 12 Oct 2012 09:07:46 +1030
Rusty Russell <rusty@...tcorp.com.au> wrote:

> "Michael S. Tsirkin" <mst@...hat.com> writes:
> > On Thu, Oct 11, 2012 at 10:33:31AM +1030, Rusty Russell wrote:
> >> OK.  Well, Anthony wants qemu to be robust in this regard, so I am
> >> tempted to rework all the qemu drivers to handle arbitrary layouts.
> >> They could use a good audit anyway.
> >
> > I agree here. Still trying to understand whether we can agree to use
> > a feature bit for this, or not.
> 
> I'd *like* to imply it by the new PCI layout, but if it doesn't work
> we'll add a new feature bit.
> 
> I'm resisting a feature bit, since it constrains future implementations
> which could otherwise assume it.
> 
> >> This would become a glaring exception, but I'm tempted to fix it to 32
> >> bytes at the same time as we get the new pci layout (ie. for the virtio
> >> 1.0 spec).
> >
> > But this isn't a virtio-pci only issue, is it?
> > qemu has s390 bus with same limmitation.
> > How can we tie it to pci layout?
> 
> They can use a transport feature if they need to, of course.  But
> perhaps the timing with ccw will coincide with the fix, in which they
> don't need to, but it might be a bit late.
> 
> Cornelia?

My virtio-ccw host code is still going through a bit of rework, so it
might well go in after the fix.

There's also the existing (non-spec'ed) s390-virtio transport. While it
will likely be deprecated sometime in the future, it should probably
get a feature bit for consistency's sake.

> 
> Cheers,
> Rusty.
> 

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