[PATCH v4 3/9] qemu_driver: Probe capability before calculating dirty page rate

From: Hyman Huang(黄勇) <huangy81(a)chinatelecom.cn&gt; Probing QEMU_CAPS_CALC_DIRTY_RATE capability in advance in case of failure when calculating dirty page rate. Signed-off-by: Hyman Huang(黄勇) <huangy81(a)chinatelecom.cn&gt; --- src/qemu/qemu_driver.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index a22646c..18775e7 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -20691,6 +20691,13 @@ qemuDomainStartDirtyRateCalc(virDomainPtr dom, if (virDomainStartDirtyRateCalcEnsureACL(dom->conn, vm->def) < 0) goto cleanup; + priv = vm->privateData; + if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_CALC_DIRTY_RATE)) { + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s", + _("QEMU does not support calculating dirty page rate")); + goto cleanup; + } + if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) goto cleanup; @@ -20702,7 +20709,6 @@ qemuDomainStartDirtyRateCalc(virDomainPtr dom, VIR_DEBUG("Calculate dirty rate in next %d seconds", seconds); - priv = vm->privateData; qemuDomainObjEnterMonitor(driver, vm); ret = qemuMonitorStartDirtyRateCalc(priv->mon, seconds); -- 1.8.3.1