EFI is a very hot topic now because more and more hardware vendors are providing some new systems with it. The long term goal is a total removal of legacy BIOS support. It means that Xen should be prepared for that case. Indeed it is mostly ready. During this presentation it will be shown what EFI is in real and how Xen and other required pieces use EFI infrastructure. However, there are still some shortcomings in Xen and they will be described too. There will be also some guidance how to efficiently start Xen on EFI platform. Some guests topics related to EFI also will be covered.