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qemuDomainSetBlockIoTune: Skip monitor call for empty cdrom

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Similarly to startup of the VM qemu doesn't like setting throttling for
an empty drive. Just skip it since we do the correct thing once new
media is inserted.

Resolves: https://gitlab.com/libvirt/libvirt/-/issues/117
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Tested-by: Han Han <hhan@redhat.com>
This commit is contained in:
Peter Krempa 2021-01-07 10:19:22 +01:00
parent 8792b74774
commit 3e0d9131cc
1 changed files with 16 additions and 9 deletions
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25
src/qemu/qemu_driver.c
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@ -16301,16 +16301,23 @@ qemuDomainSetBlockIoTune(virDomainPtr dom,
#undef CHECK_MAX
qemuDomainObjEnterMonitor(driver, vm);
ret = qemuMonitorSetBlockIoThrottle(priv->mon, drivealias, qdevid,
&info, supportMaxOptions,
set_fields & QEMU_BLOCK_IOTUNE_SET_GROUP_NAME,
supportMaxLengthOptions);
if (qemuDomainObjExitMonitor(driver, vm) < 0)
/* blockdev-based qemu doesn't want to set the throttling when a cdrom
* is empty. Skip the monitor call here since we will set the throttling
* once new media is inserted */
if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV) ||
!virStorageSourceIsEmpty(disk->src)) {
qemuDomainObjEnterMonitor(driver, vm);
ret = qemuMonitorSetBlockIoThrottle(priv->mon, drivealias, qdevid,
&info, supportMaxOptions,
set_fields & QEMU_BLOCK_IOTUNE_SET_GROUP_NAME,
supportMaxLengthOptions);
if (qemuDomainObjExitMonitor(driver, vm) < 0)
ret = -1;
if (ret < 0)
goto endjob;
ret = -1;
if (ret < 0)
goto endjob;
ret = -1;
}
virDomainDiskSetBlockIOTune(disk, &info);