[libvirt] [PATCH] qemu: fix command line building for iommu devices

[Daniel P. Berrange]

On Mon, Oct 03, 2016 at 03:02:38PM +0200, Peter Krempa wrote:
> On Mon, Oct 03, 2016 at 13:41:13 +0100, Daniel Berrange wrote:
> > The intel-iommu device has existed since QEMU 2.2.0, but
> > it was only possible to create it with -device since
> > QEMU 2.7.0, thanks to:
> > 
> >   commit 621d983a1f9051f4cfc3f402569b46b77d8449fc
> >   Author: Marcel Apfelbaum <marcel at redhat.com>
> >   Date:   Mon Jun 27 18:38:34 2016 +0300
> > 
> >     hw/iommu: enable iommu with -device
> > 
> >     Use the standard '-device intel-iommu' to create the IOMMU device.
> >     The legacy '-machine,iommu=on' can still be used.
> > 
> > The libvirt capability check & command line formatting code
> > is thus broken for all QEMU versions 2.2.0 -> 2.6.0 inclusive.
> > 
> > This fixes it to use iommu=on instead.
> > 
> > Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
> > ---
> 
> Is there any value to make it work with older versions rather than just
> clearing it completely on the versions that don't support it with
> -device?

Err that's what this change does

Regards,
Daniel
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