Virtual Machine Manager is one of the best hypervisors available for the Linux desktop. It takes virtualization on your Linux desktop to the next level.
If you run Windows make sure to install the virtio drivers
TL;DR: use what is in the kernel, without strange out of tree kernel modules like for VirtualBox, and use KVM, i.e. on fedora virt-manager qemu qemu-kvm
Bare metal is “kernel running on hardware” I think. KVM is a kernel feature, so the virtualization is done in kernel space (?) and on the hardware.
Well this can be a starting point of a rabbit hole. Time to spend hours reading stuff that I don’t really understand.
TL;DR: use what is in the kernel, without strange out of tree kernel modules like for VirtualBox, and use KVM, i.e. on fedora
virt-manager qemu qemu-kvm