Libvirt allows to specify a path to an image file that will be used as a var storage for UEFI firmware. <nvram>/var/lib/libvirt/nvram/guest_VARS.fd</nvram> By default this image is created as a copy of a master image. The master image and it's copy are stored in 'raw' format. Qemu isn't able to create snapshot for an image in 'raw' format. That makes snapshotting impossible for any UEFI configuration. If the image with UEFI nvram is converted to Qcow2 format (and qemu command is modified appropriately), snapshotting works fine. In the patch-set I introduce 'format' attribute for nvram tag that specifies nvram image file format. The patch-set doesn't contains docs and test in v1. Dmitry Andreev (5): storage: split virStorageBackendCreateExecCommand in two functions storage: refactor: split out image creating tool search function storage: add new function virStorageBackendConvertImage conf: add 'format' attribute to domain/os/nvram element qemu: add support for os.nvram 'format' attribute docs/schemas/domaincommon.rng | 8 ++ src/conf/domain_conf.c | 18 +++++ src/conf/domain_conf.h | 1 + src/qemu/qemu_command.c | 8 +- src/qemu/qemu_process.c | 17 ++++ src/storage/storage_backend.c | 181 ++++++++++++++++++++++++++---------------- src/storage/storage_backend.h | 5 ++ 7 files changed, 167 insertions(+), 71 deletions(-) -- 1.8.3.1 -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list