I would like to install windows 10 ltsc iot inside qemu/kvm using virt-manager. My question is will this be completely isolated from the host os (linux mint 22.3 cinnamon)?
I am used to running virtual machines on windows 10 using virtualbox. I just wanted to confirm that this setup should be good before going ahead. I intend to run only open source software on the linux install and this is a closed source / hostile / untrustworthy OS. I wanted to make sure it is fully isolated like I am used to with virtualbox.
Thank you.


Yes that sounds correct, the traffic would go through the host so if the host is on VPN then the VM should be on that as well when in NAT mode.
Haven’t done that myself, maybe just do some testing to make sure that’s working as expected e.g. could be worthwhile to test what happens when the VPN drops out on the host and see how the VM behaves in that scenario. I don’t know how a kill switch would behave with that setup (or if you even need it, just mentioning).
I do have a kill switch configuration set with the VPN. I will test it, again thank you for the simplified explanation. It is quite clear in my head now and I will test accordingly.