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qemu: Implement new QMP command for cpu hotplug

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This patch implements support for the "cpu-add" QMP command that plugs
CPUs into a live guest. The "cpu-add" command was introduced in QEMU
1.5. For the hotplug to work machine type "pc-i440fx-1.5" is required.

(cherry picked from commit c12b2be5169298708cf727ed9ccd42e9d89a9737)
This commit is contained in:
Peter Krempa 2013-05-27 16:08:30 +02:00 committed by Cole Robinson
parent ad02b24871
commit 6cdff51fb3
1 changed files with 35 additions and 2 deletions
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37
src/qemu/qemu_monitor_json.c
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@ -2086,9 +2086,42 @@ cleanup:
int qemuMonitorJSONSetCPU(qemuMonitorPtr mon, int qemuMonitorJSONSetCPU(qemuMonitorPtr mon,
int cpu, int online) int cpu, int online)
{ {
/* XXX Update to use QMP, if QMP ever adds support for cpu hotplug */ int ret = -1;
virJSONValuePtr cmd = NULL;
virJSONValuePtr reply = NULL;
if (online) {
cmd = qemuMonitorJSONMakeCommand("cpu-add",
"i:id", cpu,
NULL);
} else {
/* offlining is not yet implemented in qmp */
goto fallback;
}
if (!cmd)
goto cleanup;
if ((ret = qemuMonitorJSONCommand(mon, cmd, &reply)) < 0)
goto cleanup;
if (qemuMonitorJSONHasError(reply, "CommandNotFound"))
goto fallback;
else
ret = qemuMonitorJSONCheckError(cmd, reply);
/* this function has non-standard return values, so adapt it */
if (ret == 0)
ret = 1;
cleanup:
virJSONValueFree(cmd);
virJSONValueFree(reply);
return ret;
fallback:
VIR_DEBUG("no QMP support for cpu_set, trying HMP"); VIR_DEBUG("no QMP support for cpu_set, trying HMP");
return qemuMonitorTextSetCPU(mon, cpu, online); ret = qemuMonitorTextSetCPU(mon, cpu, online);
goto cleanup;
} }