In the other thread about the unsolved migration bugs in qemu-xen it became 
clear that "xen-save-devices-state" must not only be called for HVM, but for 
every domU that has qemu-xen attached to it. I wonder how to check for that 
fact from the migration code. While it can continue to rely on 
LIBXL_DOMAIN_TYPE_HVM make that call, for  LIBXL_DOMAIN_TYPE_PV it is 
apparently not that easy. Is libxl__need_xenpv_qemu the API to use for the 
decision if libxl__qmp_stop/libxl__qmp_save/libxl__qmp_resume have to be called 
during migration?


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