Comment # 2 on bug 983701 from Jiri Slaby

I use qemu-2.6.0 from Virtualization.

And Mesa forked from factory and built as
--with-gallium-drivers=r300,r600,radeonsi,nouveau,swrast,svga,virgl
instead of
--with-gallium-drivers=r300,r600,radeonsi,nouveau,swrast,svga

I submitted the virgl change to X11:XOrg / Mesa too.