[libvirt] [PATCH 0/4]use newer video device by -device in qemu commandline

[Gerd Hoffmann]

  Hi,

> For backwards
> compatibility, if a certain qemu version does not support one of the above
> video device arguments to -device or even -device itself, the -vga will still
> be used.

That will not work.  You must check the qemu version.  1.2+ is safe,
IIRC 1.1 will work too.

Technical background: '-device VGA' (+variants) exists for a looooooong
time, pretty much day one of the -device switch.  Actually using it did
not work though due to a nasty initialization order issue in qemu.  The
qemu memory api created by avi fixed it.

cheers,
  Gerd