From: Zhang Bo <oscar.zhangbo(a)huawei.com&gt; when we run the command 'virsh dommemstat xxx', althrough memballoon's model is set 'none' in vm's XML, it still reports an error in libvirtd.log. error : qemuMonitorFindBalloonObjectPath:1042 : internal error: Cannot determine balloon device path Apparently, if we don't set memballoon, we don't need to set balloon device path. Signed-off-by: Wang Yufei <james.wangyufei(a)huawei.com&gt; Signed-off-by: Zhang Bo <oscar.zhangbo(a)huawei.com&gt; --- src/qemu/qemu_monitor.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c index f959b74..8c3c6f3 100644 --- a/src/qemu/qemu_monitor.c +++ b/src/qemu/qemu_monitor.c @@ -1169,8 +1169,10 @@ qemuMonitorFindBalloonObjectPath(qemuMonitorPtr mon, if (mon->balloonpath) { return 0; } else if (mon->ballooninit) { - virReportError(VIR_ERR_INTERNAL_ERROR, "%s", - _("Cannot determine balloon device path")); + if (vm->def->memballoon && + vm->def->memballoon->model != VIR_DOMAIN_MEMBALLOON_MODEL_NONE) + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Cannot determine balloon device path")); return -1; } -- 1.7.12.4