KVM/libvirt: Moar Video Memory

I am running some legacy OSes (Windows 10, …) inside libvirt/KVM virtual machines and since I got my new 4K displays (hello Home Office), I was annoyed that I could not full-screen them on the large displays.

So finally I took some time to investigate and quickly (to my surprise) found the solution. As if we were back in the 1990ties, I did not provide the virtual machine with enough video RAM to properly go to the higher resolutions.

So changing the video settings in the domain XML from something like

<video>
      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
</video>

to something more like this

<video>
      <model type='qxl' ram='65536' vram='65536' vgamem='65536' heads='1' primary='yes'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
</video>

(notice the „vgamem” setting) I can now run the legacy OS in fullscreen on my 4k display. Jay!

Hat tip to Staf Wagemakers for his blogpost „High screen resolution on a KVM virtual machine with QXL”.

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[Mittwoch, 20210324, 18:50 | permanent link | 0 Kommentar(e)

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