"Dr. David Alan Gilbert (git)" <dgilb...@redhat.com> wrote: > From: "Dr. David Alan Gilbert" <dgilb...@redhat.com> > > VMSTATE_WITH_TMP is for handling structures where some calculation > or rearrangement of the data needs to be performed before the data > hits the wire. > For example, where the value on the wire is an offset from a > non-migrated base, but the data in the structure is the actual pointer. > > To use it, a temporary type is created and a vmsd used on that type. > The first element of the type must be 'parent' a pointer back to the > type of the main structure. VMSTATE_WITH_TMP takes care of allocating > and freeing the temporary before running the child vmsd. > > The post_load/pre_save on the child vmsd can copy things from the parent > to the temporary using the parent pointer and do any other calculations > needed; it can then use normal VMSD entries to do the actual data > storage without having to fiddle around with qemu_get_*/qemu_put_* > > Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com> > Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
My idea was to do the other way around. But as you beat me with the idea. Reviewed-by: Juan Quintela <quint...@redhat.com> Bascially what I created was a VMSTATE_SYNTHETIC() where the field value is null. You create a new get/put functions for the special values. But looking for far away it is basically the same, I just preffered the name O:-) Later, Juan
