[Qemu-devel] [PATCH 0/5] vmstate: Add max_version_id field

[Eduardo Habkost]

This series cleans up the vmstate save/load code a little, and adds a
max_version_id field to VMStateDescription.

This will be useful in case we need to revert vmstate changes but keep
compatibility with QEMU versions that had a higher version_id. No existing
behavior will be changed by code that doesn't have max_version_id set.

One possible use case for this is the the "cpu" section, where the xsave CPU
state could be made optional by moving it to a "xsave" section, and then revert
version_id back to 11 while still accepting version_id==12 migration data.

Eduardo Habkost (5):
  savevm: Coding style line length fix
  vmstate: Replace while (...) with for (...)
  vmstate: Simplify field-skipping load/save logic
  vmstate: Use version_id when saving
  vmstate: Add max_version_id field to VMStateDescription

 include/migration/vmstate.h |   1 +
 savevm.c                    | 170 +++++++++++++++++++++++---------------------
 2 files changed, 89 insertions(+), 82 deletions(-)

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1.8.3.1