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docs: document memory API interaction with migration

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Signed-off-by: Avi Kivity <avi@redhat.com>
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Avi Kivity 2011-12-07 18:57:41 +02:00
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docs/migration.txt
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@ -219,6 +219,18 @@ The functions to do that are inside a vmstate definition, and are called:
Example: You can look at hpet.c, that uses the three function to
massage the state that is transferred.
If you use memory API functions that update memory layout outside
initialization (i.e., in response to a guest action), this is a strong
indication that you need to call these functions in a post_load callback.
Examples of such memory API functions are:
- memory_region_add_subregion()
- memory_region_del_subregion()
- memory_region_set_readonly()
- memory_region_set_enabled()
- memory_region_set_address()
- memory_region_set_alias_offset()
=== Subsections ===
The use of version_id allows to be able to migrate from older versions