I need to install QEMU 2.5.0 and libvirt 1.3.3 to get around Nvidia driver issues (Code 43) when doing GPU passthrough on a windows VM. See first article under troubleshooting in src for details.

I've installed KVM using sudo apt-get install qemu-kvm qemu-utils qemu-efi ovmf libvirt-bin libvirt-de, they this gives me older versions.

With virsh the version command prints out:

Compiled against library: libvirt 1.3.1
Using library: libvirt 1.3.1
Using API: QEMU 1.3.1
Running hypervisor: QEMU 2.5.0

I've fairly new to Ubuntu, so could someone explain how I upgrade or install QEMU 2.5.0 and libvirt 1.3.3 (or a later version)?


1 Answer 1


It's probably not an issue related to the version you have/had. There's a few changes to your VM's config (xml file) you have to make to workaround nvidia's deliberate attempt to brick VM functionality on their mainstream/non workstation cards. Make sure there's no virtual display attached to the VM with the virt-manager tool, then

  1. Shut down your vm and virt manager

  2. Open up a command prompt and type:

    sudo virsh edit vmnamehere
  3. Replace the very first line with:

    <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>

    (You can find the code here: https://paste.ubuntu.com/p/HtXhxTTvjS/)

  4. Scroll to the very end of the config file and right before </domain>, insert:

      <qemu:arg value='-cpu'/>
      <qemu:arg value='host,hv_time,kvm=off,hv_vendor,hv_vendor_id=null'/>

    (You can find the code here: https://paste.ubuntu.com/p/HtXhxTTvjS/)

  5. Save + exit whatever editor you used

  6. Restart the virt-manager application

This works for me every time. Hope you didn't give up on this, as I see this is an old post. A good way to see if you're doing things right is to try GPU passthrough on an OS that will for sure work, like a Linux / Ubuntu / Debian VM.

  • Small adjustment: QEMU (in the latest version at the time this was written) supports Hyper-V time without having to use the qemu:arg notation. Replace the second qemu:arg with <qemu:arg='host,kvm=off,hv_vendor,hv_vendor_id=null'/> and add <clock offset='utc'> <timer name='hypervclock' present='yes'/> </clock> - found here
    – mdip
    Jan 7, 2020 at 13:44

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