[yjftsjthsd-h]

Doesn't running it with KVM enabled put you back into kernel space? I'm sure doing everything in userspace is safer, but TCG is nowhere near as performant...

[bonzini]

KVM is indeed one of the potentially interesting file descriptors, but there is relatively little code running in kernel space.

[monocasa]

The vast majority of the device emulation is in user space, even with KVM.