Have you followed:
https://ovirt.org/documentation/vmm-guide/chap-Installing_Windows_Virtual_Machines.html ?
you need to install the drivers

On Wed, May 15, 2019 at 7:01 PM <fraegia@gmail.com> wrote:
> You need to install Windows VirtIO drivers during the installation.
> This link should help: https://pve.proxmox.com/wiki/Windows_10_guest_best_practices
>
> On May 15 2019, at 8:36 am, gpesoli(a)it.iliad.com wrote:

Thanks for answer.

I just installed VirtIO drivers on my engine:

# ll /usr/share/virtio-win/*.iso
-rw-r--r--. 1 root root 370821120 Mar 11 23:00 /usr/share/virtio-win/virtio-win-0.1.164.iso
lrwxrwxrwx. 1 root root        22 Apr  3 10:50 /usr/share/virtio-win/virtio-win.iso -> virtio-win-0.1.164.iso

...
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