Il 19/09/2014 08:48, Alexey Kardashevskiy ha scritto: > Right now we use NVRAM on sPAPR as: > -drive id=id3,if=none,file=qemu_nvram.img > -global spapr-nvram.drive=id3 > > So the NVRAM file is BlockDriverState and HMP's "migrate -b" copies the > content just fine. > > What is missing here? Thanks.
"migrate -b" is a big hammer, because it transfers all disks. In some cases it is useful to have shared storage for disks and non-shared storage for variable stores. For UEFI, we are using RAM migration to transfer non-volatile RAM from the source to the destination. This is done by loading the whole contents of nvram into a RAM MemoryRegion at VM startup, and storing it at postload time. The latter is done with this patch. Paolo
