12:26 a.m.
From: Chun Feng Wu <danielwuwy(a)163.com>
For hot attaching/detaching
* Leverage qemuBlockThrottleFiltersData to prepare attaching/detaching
throttle filter data for qemuMonitorBlockdevAdd and qemuMonitorBlockdevDel
* For hot attaching, within qemuDomainAttachDiskGeneric,prepare throttle
filters json data, and create corresponding blockdev for QMP request
("blockdev-add" with "driver":"throttle")
* Each filter has a nodename, and those filters are chained up,
create them in sequence, and delete them reversely
* Delete filters by "qemuBlockThrottleFiltersDetach"("blockdev-del")
when detaching device
For throttle group commandline
* Add qemuBuildThrottleGroupCommandLine in qemuBuildCommandLine to add
"object" of throttle-group
* Verify throttle group definition when lauching vm
* Check QEMU_CAPS_OBJECT_JSON before "qemuBuildObjectCommandlineFromJSON",
which is to build "-object" option
For throttle filter commandline
* Add qemuBuildDiskThrottleFiltersCommandLine in qemuBuildDiskCommandLine
to add "blockdev"
Signed-off-by: Chun Feng Wu <danielwuwy(a)163.com>
---
src/qemu/qemu_command.c | 99 +++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_hotplug.c | 25 +++++++++++
2 files changed, 124 insertions(+)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 08ce02c0ea..99059792ee 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -2215,6 +2215,99 @@ qemuBuildBlockStorageSourceAttachDataCommandline(virCommand *cmd,
}
+static bool
+qemuDiskConfigThrottleGroupEnabled(const virDomainThrottleGroupDef *group)
+{
+ return !!group->group_name &&
+ virDomainBlockIoTuneInfoHasAny(group);
+}
+
+
+/**
+ * qemuBuildThrottleGroupCommandLine:
+ * @cmd: the command to modify
+ * @def: domain definition
+ * @qemuCaps: qemu capabilities object
+ *
+ * build throttle group object in json format
+ */
+static int
+qemuBuildThrottleGroupCommandLine(virCommand *cmd,
+ const virDomainDef *def,
+ virQEMUCaps *qemuCaps)
+{
+ size_t i;
+
+ for (i = 0; i < def->nthrottlegroups; i++) {
+ g_autoptr(virJSONValue) props = NULL;
+ g_autoptr(virJSONValue) limits = virJSONValueNewObject();
+ virDomainThrottleGroupDef *group = def->throttlegroups[i];
+ /* prefix group name with "throttle-" in QOM */
+ g_autofree char *prefixed_group_name = g_strdup_printf("throttle-%s",
group->group_name);
+
+ if (!qemuDiskConfigThrottleGroupEnabled(group)) {
+ continue;
+ }
+
+ if (qemuMonitorThrottleGroupLimits(limits, group) < 0)
+ return -1;
+
+ if (qemuMonitorCreateObjectProps(&props, "throttle-group",
prefixed_group_name,
+ "a:limits", &limits,
+ NULL) < 0)
+ return -1;
+
+ /* this throttle group feature requires "QEMU_CAPS_OBJECT_JSON" */
+ if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_JSON)) {
+ virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
+ _("This QEMU doesn't support throttle group
creation"));
+ return -1;
+ }
+ if (qemuBuildObjectCommandlineFromJSON(cmd, props, qemuCaps) < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int
+qemuBuildBlockThrottleFilterCommandline(virCommand *cmd,
+ qemuBlockThrottleFilterAttachData *data)
+{
+ if (data->filterProps) {
+ g_autofree char *tmp = NULL;
+ if (!(tmp = virJSONValueToString(data->filterProps, false)))
+ return -1;
+
+ virCommandAddArgList(cmd, "-blockdev", tmp, NULL);
+ }
+
+ return 0;
+}
+
+
+static int
+qemuBuildDiskThrottleFiltersCommandLine(virCommand *cmd,
+ virDomainDiskDef *disk)
+{
+ g_autoptr(qemuBlockThrottleFiltersData) data = NULL;
+ size_t i;
+
+ data = qemuBuildThrottleFiltersAttachPrepareBlockdev(disk);
+ if (!data)
+ return -1;
+
+ for (i = 0; i < data->nfilterdata; i++) {
+ if (qemuBuildBlockThrottleFilterCommandline(cmd,
+ data->filterdata[i]) < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+
static int
qemuBuildDiskSourceCommandLine(virCommand *cmd,
virDomainDiskDef *disk,
@@ -2272,6 +2365,9 @@ qemuBuildDiskCommandLine(virCommand *cmd,
if (qemuBuildDiskSourceCommandLine(cmd, disk, qemuCaps) < 0)
return -1;
+ if (qemuBuildDiskThrottleFiltersCommandLine(cmd, disk) < 0)
+ return -1;
+
/* SD cards are currently instantiated via -drive if=sd, so the -device
* part must be skipped */
if (qemuDiskBusIsSD(disk->bus))
@@ -10602,6 +10698,9 @@ qemuBuildCommandLine(virDomainObj *vm,
if (qemuBuildIOThreadCommandLine(cmd, def, qemuCaps) < 0)
return NULL;
+ if (qemuBuildThrottleGroupCommandLine(cmd, def, qemuCaps) < 0)
+ return NULL;
+
if (virDomainNumaGetNodeCount(def->numa) &&
qemuBuildNumaCommandLine(cfg, def, cmd, priv) < 0)
return NULL;
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 75b97cf736..2eaae3f49d 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -657,6 +657,7 @@ qemuDomainAttachDiskGeneric(virDomainObj *vm,
virDomainAsyncJob asyncJob)
{
g_autoptr(qemuBlockStorageSourceChainData) data = NULL;
+ g_autoptr(qemuBlockThrottleFiltersData) filterData = NULL;
qemuDomainObjPrivate *priv = vm->privateData;
g_autoptr(virJSONValue) devprops = NULL;
bool extensionDeviceAttached = false;
@@ -695,6 +696,19 @@ qemuDomainAttachDiskGeneric(virDomainObj *vm,
if (rc < 0)
goto rollback;
+ /* Setup throttling filters
+ * add additional "blockdev-add"(throttle filter) between
"blockdev-add" (qemuBlockStorageSourceChainAttach) and "device_add"
(qemuDomainAttachExtensionDevice)
+ */
+ if ((filterData = qemuBuildThrottleFiltersAttachPrepareBlockdev(disk))) {
+ if (qemuDomainObjEnterMonitorAsync(vm, asyncJob) < 0)
+ return -1;
+ /* QMP requests("blockdev-add" with
"driver":"throttle") to QEMU */
+ rc = qemuBlockThrottleFiltersAttach(priv->mon, filterData);
+ qemuDomainObjExitMonitor(vm);
+ if (rc < 0)
+ goto rollback;
+ }
+
if (disk->transient) {
g_autoptr(qemuBlockStorageSourceAttachData) backend = NULL;
g_autoptr(GHashTable) blockNamedNodeData = NULL;
@@ -766,6 +780,8 @@ qemuDomainAttachDiskGeneric(virDomainObj *vm,
if (extensionDeviceAttached)
ignore_value(qemuDomainDetachExtensionDevice(priv->mon, &disk->info));
+ qemuBlockThrottleFiltersDetach(priv->mon, filterData);
+
qemuBlockStorageSourceChainDetach(priv->mon, data);
qemuDomainObjExitMonitor(vm);
@@ -4514,6 +4530,7 @@ qemuDomainRemoveDiskDevice(virQEMUDriver *driver,
{
qemuDomainDiskPrivate *diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
g_autoptr(qemuBlockStorageSourceChainData) diskBackend = NULL;
+ g_autoptr(qemuBlockThrottleFiltersData) filterData = NULL;
size_t i;
qemuDomainObjPrivate *priv = vm->privateData;
int ret = -1;
@@ -4552,6 +4569,14 @@ qemuDomainRemoveDiskDevice(virQEMUDriver *driver,
}
}
+ qemuDomainObjEnterMonitor(vm);
+ /* QMP request("blockdev-del") to QEMU to delete throttle filter*/
+ if ((filterData = qemuBuildThrottleFiltersDetachPrepareBlockdev(disk))) {
+ /* "qemuBlockThrottleFiltersDetach" is used in rollback within
"qemuDomainAttachDiskGeneric" as well */
+ qemuBlockThrottleFiltersDetach(priv->mon, filterData);
+ }
+ qemuDomainObjExitMonitor(vm);
+
qemuDomainObjEnterMonitor(vm);
if (diskBackend)
--
2.43.0