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Add a new udev rule that is triggered when a KVM VM is started on the system the very first time. This rule reports over the sysfs CPI kernel interface that the system is a KVM host. Currently the cpi.service systemd unit already works with the CPI sysfs interface. Introduce a new internal utility script "cpictl" that is used by both the udev rule and the systemd unit to guarantee coordinated access to the kernel CPU interface. Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> Reviewed-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com> Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>