On 2/20/22 14:28, huangy81@xxxxxxxxxxxxxxx wrote:
> From: Hyman Huang(黄勇) <huangy81@xxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxx>
> ---
> 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 f1f708e..9b50f5f 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -20693,6 +20693,13 @@ 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;
> + }
> +
Sorry for not telling you the whole truth. priv->qemuCaps is populated
only when domain is running. Therefore for inactive domains this ^^^
error message is reported which may be a bit misleading. But the fix is
trivial, just check whether domain is active before querying priv-qemuCaps.
> if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
> goto cleanup;
>
> @@ -20704,7 +20711,6 @@ qemuDomainStartDirtyRateCalc(virDomainPtr dom,
>
> VIR_DEBUG("Calculate dirty rate in next %d seconds", seconds);
>
> - priv = vm->privateData;
> qemuDomainObjEnterMonitor(driver, vm);
> ret = qemuMonitorStartDirtyRateCalc(priv->mon, seconds);
>
Michal
