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authorPeter Maydell <peter.maydell@linaro.org>2014-04-03 19:52:28 +0300
committerJuan Quintela <quintela@redhat.com>2014-05-05 22:15:03 +0200
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parent9f8e9895c504149d7048e9fc5eb5cbb34b16e49a (diff)
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savevm: Ignore minimum_version_id_old if there is no load_state_old
At the moment we require vmstate definitions to set minimum_version_id_old to the same value as minimum_version_id if they do not provide a load_state_old handler. Since the load_state_old functionality is required only for a handful of devices that need to retain migration compatibility with a pre-vmstate implementation, this means the bulk of devices have pointless boilerplate. Relax the definition so that minimum_version_id_old is ignored if there is no load_state_old handler. Note that under the old scheme we would segfault if the vmstate specified a minimum_version_id_old that was less than minimum_version_id but did not provide a load_state_old function, and the incoming state specified a version number between minimum_version_id_old and minimum_version_id. Under the new scheme this will just result in our failing the migration. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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