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qcow2: introduce icount field for snapshots

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This patch introduces the icount field for saving within the snapshot.
It is required for navigation between the snapshots in record/replay mode.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Acked-by: Kevin Wolf <kwolf@redhat.com>

--

v7 changes:
 - also fix the test which checks qcow2 snapshot extra data
Message-Id: <160174518284.12451.2301137308458777398.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2020-10-03 20:13:02 +03:00 • committed by Paolo Bonzini
parent 56db1198a4
commit bbacffc5f7
5 changed files with 58 additions and 23 deletions
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5
docs/interop/qcow2.txt
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@ -707,6 +707,11 @@ Snapshot table entry:
Byte 48 - 55: Virtual disk size of the snapshot in bytes
Byte 56 - 63: icount value which corresponds to
the record/replay instruction count
when the snapshot was taken. Set to -1
if icount was disabled
Version 3 images must include extra data at least up to
byte 55.