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
11This operation is called "xen-save-devices-state" (see
12qmp-commands.txt)
13
14
15The binary format used in the file is the following:
16
17
18-------------------------------------------
19
2032 bit big endian: QEMU_VM_FILE_MAGIC
2132 bit big endian: QEMU_VM_FILE_VERSION
22
23for_each_device
24{
25    8 bit:              QEMU_VM_SECTION_FULL
26    32 bit big endian:  section_id
27    8 bit:              idstr (ID string) length
28    string:             idstr (ID string)
29    32 bit big endian:  instance_id
30    32 bit big endian:  version_id
31    buffer:             device specific data
32}
33
348 bit: QEMU_VM_EOF
35