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Date: Tue, 17 Feb 2015 09:42:50 +0100
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v2 1/4] virtio-pci: add flags to
 enable/disable legacy/modern
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Fam Zheng <famz@redhat.com>, qemu-devel@nongnu.org, Anthony Liguori <aliguori@amazon.com>

On Tue, Feb 17, 2015 at 09:23:35AM +0100, Gerd Hoffmann wrote:
>   Hi,
> 
> > Should we forbid setting both legacy and modern at the same time?
> 
> No, this is explicitly allowed in the spec and it is needed for the
> transition from legacy to modern.
> 
> cheers,
>   Gerd

But !legacy && !modern aren't legal together, correct?