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migration: dump vmstate info as a json file for static analysis

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This commit adds a new command, '-dump-vmstate', that takes a filename
as an argument.  When executed, QEMU will dump the vmstate information
for the machine type it's invoked with to the file, and quit.

The JSON-format output can then be used to compare the vmstate info for
different QEMU versions, specifically to test whether live migration
would break due to changes in the vmstate data.

A Python script that compares the output of such JSON dumps is included
in the following commit.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Amit Shah 2014-06-20 18:56:08 +05:30 • committed by Juan Quintela
parent e325b49a32
commit abfd9ce341
4 changed files with 168 additions and 0 deletions
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2
include/migration/vmstate.h
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@ -788,4 +788,6 @@ int64_t self_announce_delay(int round)
return 50 + (SELF_ANNOUNCE_ROUNDS - round - 1) * 100;
}
void dump_vmstate_json_to_file(FILE *out_fp);
#endif