qemu-kvm not working as nested inside ESX 6.0 ESX 6.0 (virt bits exposed) - Ubuntu 16.04 + qemu-kvm 1:2.8+dfsg-3ubuntu2~cloud0 - CirrOS launched by OpenStack (devstack master) VM will start with -machine = 'pc-i440fx-zesty' and will stuck in "booting from hard disk" to fix it you can manually change -machine to 'pc-i440fx-2.3' also, ISOs boots well, so I think it`s something about block devices configuration introduced in new machine type. p.s. also confirmed with RHEL instead of Ubuntu as KVM host - new machine type don`t work