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35 lines
1,004 B
Plaintext
35 lines
1,004 B
Plaintext
= Save Devices =
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QEMU has code to load/save the state of the guest that it is running.
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These are two complementary operations. Saving the state just does
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that, saves the state for each device that the guest is running.
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These operations are normally used with migration (see migration.txt),
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however it is also possible to save the state of all devices to file,
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without saving the RAM or the block devices of the VM.
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This operation is called "xen-save-devices-state" (see
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QMP/qmp-commands.txt)
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The binary format used in the file is the following:
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-------------------------------------------
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32 bit big endian: QEMU_VM_FILE_MAGIC
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32 bit big endian: QEMU_VM_FILE_VERSION
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for_each_device
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{
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8 bit: QEMU_VM_SECTION_FULL
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32 bit big endian: section_id
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8 bit: idstr (ID string) length
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string: idstr (ID string)
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32 bit big endian: instance_id
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32 bit big endian: version_id
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buffer: device specific data
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}
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8 bit: QEMU_VM_EOF
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