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

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Message-ID: <5077C8DA.5030604@redhat.com>
Date:	Fri, 12 Oct 2012 09:38:02 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	"Michael S. Tsirkin" <mst@...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,
	Cornelia Huck <cornelia.huck@...ibm.com>
Subject: Re: [PATCH 0/3] virtio-net: inline header support

Il 12/10/2012 00:37, Rusty Russell ha scritto:
> "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.

Future implementations may certainly refuse to start if the feature is
not there.  Whether it's a good idea or not, well, that depends on how
much future they are.

Paolo

>>> 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?
> 
> Cheers,
> Rusty.
> 

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