It's been a while since the last virtio-cpu status report. qemu 2.6 release is just around the corner, time for a writeup about what is coming.
virgl support was added to qemu 2.5 already. It was supported only by the SDL2 and gtk UIs. Which is a nice start, but has the drawback that qemu needs direct access to your display. You can't logout from your desktop session without also killing the virtual machine.
qemu 2.6 features headless opengl support and spice integration. qemu will use render nodes, render the guest display into dma-bufs, and pass on those dma-bufs to spice-client for display (if connected). Works for local display only for now, i.e. spice will simply display the dma-bufs. Long-term plan (after the spice video support overhaul currently in progress is merged) is to also support hardware-assisted video encoding for a remote display.
If you want play with this you need:
- latest spice-gtk version (0.31)
- latest spice-server development release (0.13.1)
- virglrenderer (packages should start showing up in distros now).
If you are running fedora or rhel7 you can use my copr repo.
And of course you need latest qemu (2.6 release candidate or final release once out) too.
OpenGL support is off by default in qemu, you have to enable it manually by appending gl=on to the -spice options. libvirt 1.3.0 and newer has support for that in the domain xml. The spice client must be attached (virt-viewer --attach) using unix sockets because they are used to pass the dma-bug file descriptors.