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From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 17/33] virtio-pci: add flags to
 enable/disable legacy/modern
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To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>, qemu-devel@nongnu.org, "Michael S. Tsirkin" <mst@redhat.com>

  Hi,

> libvirt support for these in the domain xml syntax goes into
> "nice-to-have" category, but I can equally well live without them and
> use the <qemu:*> tags to set them if needed.

For anyone playing with this:  The magic words to flip the modern switch
for virtio-pci devices globally via libvirt domain xml are:

  <qemu:commandline>
    <qemu:arg value='-global'/>
    <qemu:arg value='virtio-pci.disable-modern=off'/>
  </qemu:commandline>

HTH,
  Gerd