1) what's the latest Freebsd version able to support qemu + kvm ? I read that kvm has been removed on 2016,so it should be 10 or 11. It was also able to support nested virtualization ?
Unfortunately there's no KVM support for qemu on FreeBSD.
Edit: to see what acceleration you have built in (not necessarily available afaik) you can do qemu-system-x86_64 -accel help. Assuming you want to run x86 guest.
Well nothing from 2016 is supported anymore so that'll be tough luck. Not sure you'd gain much from that either (security risks excluded). You triggered a small flashback in my head though -- I do remember installing vmware3 on FreeBSD and I liked it. FreeBSD 5 or 6 it was ? Don't remember..
If you do need some sort of acceleration I'd stick with bhyve or VirtualBox on FreeBSD. And I'm saying that as very big fan of qemu.
Personally on machines where I need accelerated qemu I chose Linux.
During the years I've switched slowly from Windows to Linux and from Linux to FreeBSD. Sure,there are OSes with which I can do some tasks faster and easier than others and I could use them. But If I'm able to learn and to configure very well the OS that I like more (at the moment is FreeBSD) I think that I can do everything only with it. I want to use Linux rarely,because I prefer the simplicity to complications. I can accept a certain amount of complications only if they correspond to the activation of certain features that I particularly love to have. I don't like VirtualBOX. Bhyve is better. At the moment qemu+kvm on Linux is the better choice,but bhyve is almost comparable.
Code:
# qemu-system-x86_64 -accel help
Accelerators supported in QEMU binary:
tcg
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