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),
but for those distros that backport qxl, this additional capability
check will allow the correct command line for both RHEL 6.3 (which
lacks the feature) and RHEL 6.4 (where qemu still claims to be
version 0.12.2.x, but has backported multi-head qxl).
* src/qemu/qemu_capabilities.c (virQEMUCapsObjectPropsQxlVga): New
property test.
(virQEMUCapsExtractDeviceStr): Probe for backport of new
capability to qemu earlier than 1.2.
* tests/qemuhelpdata/qemu-kvm-1.2.0-device: Update test.
* tests/qemuhelpdata/qemu-1.2.0-device: Likewise.
* tests/qemuhelpdata/qemu-kvm-0.12.1.2-rhel62-beta-device:
Likewise.
Both generated with
qemu-system-x86_64 --help > qemu-1.2.0
qemu-system-x86_64 \
-device ? \
-device pci-assign,? \
-device virtio-blk-pci,? \
-device virtio-net-pci,? \
-device scsi-disk,? \
-device PIIX4_PM,? \
-device usb-redir,? \
-device ide-drive,? \
-device usb-host,? 2> qemu-1.2.0-device
It seems I missed a few -device flags when doing this last time and I
mixed up qemu and qemu-kvm.
