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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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13
vl.c
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@ -2935,6 +2935,7 @@ int main(int argc, char **argv, char **envp)
1024 * 1024;
ram_addr_t maxram_size = default_ram_size;
uint64_t ram_slots = 0;
FILE *vmstate_dump_file = NULL;
atexit(qemu_run_exit_notifiers);
error_set_progname(argv[0]);
@ -3944,6 +3945,13 @@ int main(int argc, char **argv, char **envp)
}
configure_msg(opts);
break;
case QEMU_OPTION_dump_vmstate:
vmstate_dump_file = fopen(optarg, "w");
if (vmstate_dump_file == NULL) {
fprintf(stderr, "open %s: %s\n", optarg, strerror(errno));
exit(1);
}
break;
default:
os_parse_cmd_args(popt->index, optarg);
}
@ -4495,6 +4503,11 @@ int main(int argc, char **argv, char **envp)
}
qdev_prop_check_global();
if (vmstate_dump_file) {
/* dump and exit */
dump_vmstate_json_to_file(vmstate_dump_file);
return 0;
}
if (incoming) {
Error *local_err = NULL;