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Windows 7 guests hang on bootup when qxl video is used
I installed libvirt-bin and virt-manager on Ubuntu 16.04. I created a new VM for Windows 7, basically with default settings, which includes qxl video.. The Windows boot process hangs with the "Starting Windows" animation. CPU and disk I/O drop to zero, and it continues animating.... forever and ever... It never finishes booting. But it doesn't fully "hang" either: the animation continues to animate.
As a workaround, I set the video mode to "Cirrus" and then Windows boots but it is slow and limited. And also apparently to be avoided:
https://www.kraxel.org/blog/2014/10/qemu-using-cirrus-considered-harmful/
I can confirm it's only when qxl is enabled, because if I switch from Cirrus back to qxl, it hangs again - and going back to Cirrus again "fixes" the problem.
This issue is also reported elsewhere:
http://serverfault.com/questions/776406/windows-7-setup-hangs-at-starting-windows-using-proxmox-4-2
https://forum.proxmox.com/threads/win7-setup-hangs-in-proxmox-ve-4-2.27388/
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