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I’ve just freshly installed virt-manager and libvirt-bin (and related packages) on a Debian sid system, and have a strange problem I’ve not yet seen on another similar installation:

When creating a new VM, I get presented one with an IDE disc and an RTL8139 NIC. I can change the type of the NIC to virtio, no problem, but I cannot add a virtio disc. All I get offered are IDE disc/CD, Floppy, SCSI disc, USB disc.

How to fix this? Am I unexpectedly missing any supplementary packages?

Clarification: I’ve got a disc image which I can add to the VM, no problem, just I’d like to add it as virtio disc, not as IDE disc. No filesystem permission problems or anything.

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  • This mailing list poster had the same problem yet received no answer either… Commented Apr 5, 2014 at 10:20
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    I managed a workaround using virsh edit $domain but this is, of course, no solution… (but at least, the VM came up cleanly with /dev/vda usable). Commented Apr 5, 2014 at 12:16
  • Looks like a bug to me. Report it in debian's BZ Commented Apr 6, 2014 at 3:24
  • @dyasny I can’t reproduce it on another system though. I’m running Debian sid at work too, and (even after dist-upgrading today) the virt-manager setup on this box is able to add Virtio discs, LUNs, etc. Commented Apr 7, 2014 at 12:30
  • There is nothing that would block virtio. If it doesn't show up, I'd start looking at the code, and that usually means a bug. Try to update both hosts to the same patch level to make sure you are running the same code in both locations Commented Apr 7, 2014 at 15:52

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I just had the same problem and came up with this solution:

Check: Is kvm really enabled in your bios?? Run this: dmesg | grep kvm

If it says kvm: disabled by bios go to the bios and enable it! in virt-manager you can now select kvm as emulator for new machines. I just recreated my machine without modifying the image and now virtio is available for disks.

What confused me for quite a while is that vmx is shown in /proc/cpuinfo even if VT is disabled in the bios so I did not check there first.

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