Hi, all. There is old patch series [1] to add file format to UEFI and NVRAM. It is not merged because I guess it is intended to be used with online internal snapshot and such snapshot have issues with nvram. First it can save VM state in nvram image. Second nvram is saved as part of VM state so one doesn't need to make nvram image snapshot as QEMU does. This is explained in greater details in [2]. But offline internal snapshots and disk only snapshots makes sense. So what about finally take the patch series. [1] [PATCH v2 0/4] UEFI and NVRAM store file format https://www.redhat.com/archives/libvir-list/2015-January/msg00444.html [2] discussion of internal snapshot support for VMs with nvram https://bugzilla.redhat.com/show_bug.cgi?id=1180955#c7 Nikolay