linux-kernel - Re: [PATCH RFC] virtio-spec: flexible configuration layout

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Date:	Wed, 9 Nov 2011 14:25:50 +0200 (EET)
From:	Pekka Enberg <penberg@...nel.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
cc:	Sasha Levin <levinsasha928@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Amit Shah <amit.shah@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Krishna Kumar <krkumar2@...ibm.com>,
	Pawel Moll <pawel.moll@....com>,
	Wang Sheng-Hui <shhuiw@...il.com>,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	avi@...hat.com, penberg@...helsinki.fi
Subject: Re: [PATCH RFC] virtio-spec: flexible configuration layout

On Wed, 9 Nov 2011, Michael S. Tsirkin wrote:
>> KVM tool actually has support for 64bit features, we can probably remove
>> that when Pekka isn't looking :)
>
> It's not yet released so maybe it's not an issue yet.
> If it's too late I can re-add them to legacy too.
>
> Pekka, 64 features aren't yet used and we are discussing
> changing the layout for that field. Mind taking it out
> of kvm tool for now?

Sasha, why did we add 64-bit features to the KVM tool? Wasn't it part of 
the virtio spec? Does QEMU not use them? How badly will older versions of 
the KVM tool break if you drop 64-bit features?

 			Pekka
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