[libvirt] [PATCH] qemu: detect multi-head qxl via more than version check

[Jiri Denemark]

On Wed, Mar 13, 2013 at 18:48:46 -0600, Eric Blake wrote:
> Multi-head QXL support is so useful that distros have started to
> backport it to qemu earlier than 1.2.  After discussion with
> Alon Levy, we determined that the existence of the qxl-vga.surfaces
> property is a reliable indicator of whether '-device qxl-vga' works,
> or whether we have to stick to the older '-vga qxl'.  I'm leaving
> in the existing check for QEMU_CAPS_DEVICE_VIDEO_PRIMARY tied to
> qemu 1.2 and newer (in case qemu is built without qxl support),

So in other words, QEMU_CAPS_DEVICE_VIDEO_PRIMARY will be set iff qemu
version is 1.2 or newer or qxl-vga.surfaces exists. That seems fine.

ACK

Jirka