On 13.09.2014 17:21, bancfc(a)openmailbox.org wrote: The option was introduced in d0711642 (v.1.2.8), and as the commit message says: Add new 'kvm' domain feature and ability to hide KVM signature QEMU 2.1 added support for the kvm=off option to the -cpu command, allowing the KVM hypervisor signature to be hidden from the guest. This enables disabling of some paravirualization features in the guest as well as allowing certain drivers which test for the hypervisor to load. Domain XML syntax is as follows: For non qemu drivers the option is parsed and formatted back, but ignored on domain startup. Michal