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Add a base class that is common to virtio-gpu and vhost-user-gpu devices. The VirtIOGPUBase base class provides common functionalities necessary for both virtio-gpu and vhost-user-gpu: - common configuration (max-outputs, initial resolution, flags) - virtio device initialization, including queue setup - device pre-conditions checks (iommu) - migration blocker - virtio device callbacks - hooking up to qemu display subsystem - a few common helper functions to reset the device, retrieve display informations - a class callback to unblock the rendering (for GL updates) What is left to the virtio-gpu subdevice to take care of, in short, are all the virtio queues handling, command processing and migration. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-id: 20190524130946.31736-8-marcandre.lureau@redhat.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>