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

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Message-ID: <87wqyw63et.fsf@rustcorp.com.au>
Date:	Fri, 12 Oct 2012 09:07:46 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	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,
	"Cornelia Huck" <cornelia.huck@...ibm.com>
Subject: Re: [PATCH 0/3] virtio-net: inline header support

"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?

Cheers,
Rusty.
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