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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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14
qemu-options.hx
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@ -3252,6 +3252,20 @@ STEXI
prepend a timestamp to each log message.(default:on)
ETEXI
DEF("dump-vmstate", HAS_ARG, QEMU_OPTION_dump_vmstate,
"-dump-vmstate <file>\n"
" Output vmstate information in JSON format to file.\n"
" Use the scripts/vmstate-static-checker.py file to\n"
" check for possible regressions in migration code\n"
" by comparing two such vmstate dumps.",
QEMU_ARCH_ALL)
STEXI
@item -dump-vmstate @var{file}
@findex -dump-vmstate
Dump json-encoded vmstate information for current machine type to file
in @var{file}
ETEXI
HXCOMM This is the last statement. Insert new options before this line!
STEXI
@end table