this post was submitted on 17 Apr 2024
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Let me add one more voice to say, why oh why would you do that to yourself and suffer subpar virtualization when you have world class type 1 virtualization built straight into the kernel. And an incredibly capable UI, around since 2009, in the form of virt-manager?
Meh I can get a Win11 guest that interacts well and conveniently with the host and its peripherals and if all I'm doing is running tax software, office365 or compile my Rust app to test it cross platform - vbox is perfectly fine. I'm not running anything demanding.
I'm not taking a stance against KVM it's great, but rather saying that for some of us it's not that big of an issue which solution to use, it just needs to be convenient.
But like... why? It's not even more convenient, virt-manager is literally zero setup (in Debian at least) and you don't need to deal with DKMS.
The kvm-guest-agent tool and some virtio drivers even exist for winblows.
When I run virt-manager on Bookworm, all it does is tell me that "xen is not connected". There is nothing to indicate that KVM is anything that virt-manager might support, or why it currently doesn't.
The best I can do is to make a VM in gnome boxes, use "ps" to capture its command line to qemu, re-format that into something that I can put into a bash script, and edit in additional options that Boxes/libvirt absolutely refuse to support.
Most of the host integration features are better in Virtualbox. On the other hand, with qemu I don't have to look at VB filling the journal with ubsan errors (and wonder if its crappy driver is corrupting shit). If VB supported KVM, I would go right back to it.
You just need to add a KVM connection.
File > Add connection > select "QEMU/KVM" > Profit
Highly doubt that, specially if you're using Virtio devices and the qemu guest agents.
Aha, thank you! That's just a weird enough concept to "attach to" a local QEMU user session (where virt-manager will be the guy spinning it off anyway) that I would never have seen it.
Every newbie article about virt-manager starts with a filled list of connections, so I was down to figuring that it's cleverly detecting a missing dependency or permission and silently eliminating list entries for me.
Glad it helped! The idea is that virt-manager is semi backend agnostic. It'll doe Xen, Qemu, and LXC via libvirt, and it can do those as root, or unprivileged as well as connect to remote sessions via ssh. Pretty darn cool!
Don't you hate it when a newbie how-to doesn't start from where a newbie will, with a fresh install and nothing configured and no prior knowledge?
Tried for days to get a windows 11 guest to work on KVM with virt manager. Couldn't get very good performance at all. Virtual box with guest drivers is pretty close to bare metal for me. I'd love to use KVM but can't get good performance
It is also really slow. I can't play games in it and doing any CPU or GPU heavy work takes for ever.
Meanwhile KVM runs VMs pretty much like they are native. (1-2% slower technically)
Well, it is a type 1 hypervisor…
Exactly