When we try to get a hot-unplug disk blkdevio settings via qemuDomainGetBlockIoTune, libvirt will output a cannot find device error.Move the check after confirm vm is running. Signed-off-by: Luyao Huang <lhuang(a)redhat.com&gt; --- src/qemu/qemu_driver.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 411179d..c717c76 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -17031,12 +17031,11 @@ qemuDomainGetBlockIoTune(virDomainPtr dom, goto endjob; } - device = qemuDiskPathToAlias(vm, disk, NULL); - if (!device) { - goto endjob; - } - if (flags & VIR_DOMAIN_AFFECT_LIVE) { + device = qemuDiskPathToAlias(vm, disk, NULL); + if (!device) { + goto endjob; + } qemuDomainObjEnterMonitor(driver, vm); ret = qemuMonitorGetBlockIoThrottle(priv->mon, device, &reply, supportMaxOptions); qemuDomainObjExitMonitor(driver, vm); -- 1.8.3.1