I have four partitions on 2 HD's, sda and sdb, each having Debian installed in different configurations. My general purpose OS is on sda1, and I want to be able to run VM's of the other OS's while logged in to sda1.A recommendation I got was to use KVM since it apparently allows use of an existing installed OS as it's 'image'. I have never used KVM before and would appreciate guidelines & references on how to go about doing install and setup.
How to install KVM to use existing installed OS's?
kvm
You can boot you other systems like this:$ qemu-system-x86_64 -hda /dev/sdb -m 2G -enable-kvm  \    -net user,hostfwd=tcp::10022-:22 -net nicAssuming that /dev/sdb has a working grub installation.The -net enables simple networking support (TCP/UDP but no ICMP) and creates a port redirection for ssh (you can then connect to local port 10022 on the host to ssh into the VM). With -m 2G you assign 2GB RAM to this KVM instance.