I'm not primarily a linux admin, so I need some assistance here.
1. Are you creating the tmpfs on the host or on the VM?
2. What exactly do you mean by "create the qemu disk ontop of that ramdisk" ? Please use large crayons - I know this will be obvious to people who live in the linux administration world, but I'm just on the fringes of that world and a relative novice. Ideally, I'd like a link to step by step instructions for retrofitting an existing installation like this.