1= Save Devices = 2 3QEMU has code to load/save the state of the guest that it is running. 4These are two complementary operations. Saving the state just does 5that, saves the state for each device that the guest is running. 6 7These operations are normally used with migration (see migration.txt), 8however it is also possible to save the state of all devices to file, 9without saving the RAM or the block devices of the VM. 10 11The save operation is available as QMP command xen-save-devices-state. 12 13 14The binary format used in the file is the following: 15 16 17------------------------------------------- 18 1932 bit big endian: QEMU_VM_FILE_MAGIC 2032 bit big endian: QEMU_VM_FILE_VERSION 21 22for_each_device 23{ 24 8 bit: QEMU_VM_SECTION_FULL 25 32 bit big endian: section_id 26 8 bit: idstr (ID string) length 27 string: idstr (ID string) 28 32 bit big endian: instance_id 29 32 bit big endian: version_id 30 buffer: device specific data 31} 32 338 bit: QEMU_VM_EOF 34