xen-save-devices-state.txt (998B)
1 = Save Devices = 2 3 QEMU has code to load/save the state of the guest that it is running. 4 These are two complementary operations. Saving the state just does 5 that, saves the state for each device that the guest is running. 6 7 These operations are normally used with migration (see migration.txt), 8 however it is also possible to save the state of all devices to file, 9 without saving the RAM or the block devices of the VM. 10 11 The save operation is available as QMP command xen-save-devices-state. 12 13 14 The binary format used in the file is the following: 15 16 17 ------------------------------------------- 18 19 32 bit big endian: QEMU_VM_FILE_MAGIC 20 32 bit big endian: QEMU_VM_FILE_VERSION 21 22 for_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 33 8 bit: QEMU_VM_EOF