US Patent 9940148 In-place hypervisor updates

Techniques for in-place updates of hypervisors are described herein. At a time after receiving an update hypervisor request, one or more controlling domains within a computing system invoke one or more system capabilities at least to pause execution of currently running client domains and non-essential CPUs. While the client domains and non-essential CPUs are paused, a new hypervisor in instantiated, state information is copied from the existing hypervisor to the new hypervisor. After the state and/or configuration copy is complete, control is switched form the existing hypervisor to the new hypervisor and client domains and non-essential CPUs are resumed.