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Add code to track the address of the VM generation ID buffer across a save/restore or migrate, and increment it as necessary. The address of the buffer is written into xenstore by hvmloader at boot time. It must be read from xenstore by the caller of xc_domain_save() and then written back again by the caller of xc_domain_restore(). Note that the changes to xc_save.c and xc_restore.c are merely sufficient for them to build. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Committed-by: Ian Jackson <ian.jackson.citrix.com>