qemu: monitor: Allow using 'id' instead of 'device' for 'block_set_io_throttle'

The 'device' argument matches only the legacy drive alias. For blockdev
we need to set the throttling for a QOM id and thus we'll need to use
the 'id' field.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_driver.c

@@ -18472,7 +18472,7 @@ qemuDomainSetBlockIoTune(virDomainPtr dom,
           * via the JSON error code from the block_set_io_throttle call */
 
         qemuDomainObjEnterMonitor(driver, vm);
-        ret = qemuMonitorSetBlockIoThrottle(priv->mon, device,
+        ret = qemuMonitorSetBlockIoThrottle(priv->mon, device, NULL,
                                             &info, supportMaxOptions,
                                             set_fields & QEMU_BLOCK_IOTUNE_SET_GROUP_NAME,
                                             supportMaxLengthOptions);

src/qemu/qemu_monitor.c

@@ -3444,17 +3444,19 @@ qemuMonitorGetBlockJobInfo(qemuMonitorPtr mon,
 
 int
 qemuMonitorSetBlockIoThrottle(qemuMonitorPtr mon,
-                              const char *device,
+                              const char *drivealias,
+                              const char *qomid,
                               virDomainBlockIoTuneInfoPtr info,
                               bool supportMaxOptions,
                               bool supportGroupNameOption,
                               bool supportMaxLengthOptions)
 {
-    VIR_DEBUG("device=%p, info=%p", device, info);
+    VIR_DEBUG("drivealias=%s, qomid=%s, info=%p",
+              NULLSTR(drivealias), NULLSTR(qomid), info);
 
     QEMU_CHECK_MONITOR(mon);
 
-    return qemuMonitorJSONSetBlockIoThrottle(mon, device, info,
+    return qemuMonitorJSONSetBlockIoThrottle(mon, drivealias, qomid, info,
                                              supportMaxOptions,
                                              supportGroupNameOption,
                                              supportMaxLengthOptions);

src/qemu/qemu_monitor.h

@@ -932,7 +932,8 @@ int qemuMonitorOpenGraphics(qemuMonitorPtr mon,
                             bool skipauth);
 
 int qemuMonitorSetBlockIoThrottle(qemuMonitorPtr mon,
-                                  const char *device,
+                                  const char *drivealias,
+                                  const char *qomid,
                                   virDomainBlockIoTuneInfoPtr info,
                                   bool supportMaxOptions,
                                   bool supportGroupNameOption,

src/qemu/qemu_monitor_json.c

@@ -4897,7 +4897,8 @@ qemuMonitorJSONBlockIoThrottleInfo(virJSONValuePtr io_throttle,
 #undef GET_THROTTLE_STATS_OPTIONAL
 
 int qemuMonitorJSONSetBlockIoThrottle(qemuMonitorPtr mon,
-                                      const char *device,
+                                      const char *drivealias,
+                                      const char *qomid,
                                       virDomainBlockIoTuneInfoPtr info,
                                       bool supportMaxOptions,
                                       bool supportGroupNameOption,
@@ -4907,12 +4908,17 @@ int qemuMonitorJSONSetBlockIoThrottle(qemuMonitorPtr mon,
     virJSONValuePtr cmd = NULL;
     virJSONValuePtr result = NULL;
     virJSONValuePtr args = NULL;
+    const char *errdev = drivealias;
+
+    if (!errdev)
+        errdev = qomid;
 
     if (!(cmd = qemuMonitorJSONMakeCommand("block_set_io_throttle", NULL)))
         return -1;
 
     if (virJSONValueObjectCreate(&args,
-                                 "s:device", device,
+                                 "S:device", drivealias,
+                                 "S:id", qomid,
                                  "U:bps", info->total_bytes_sec,
                                  "U:bps_rd", info->read_bytes_sec,
                                  "U:bps_wr", info->write_bytes_sec,
@@ -4967,10 +4973,10 @@ int qemuMonitorJSONSetBlockIoThrottle(qemuMonitorPtr mon,
     if (virJSONValueObjectHasKey(result, "error")) {
         if (qemuMonitorJSONHasError(result, "DeviceNotActive")) {
             virReportError(VIR_ERR_OPERATION_INVALID,
-                           _("No active operation on device: %s"), device);
+                           _("No active operation on device: %s"), errdev);
         } else if (qemuMonitorJSONHasError(result, "NotSupported")) {
             virReportError(VIR_ERR_OPERATION_INVALID,
-                           _("Operation is not supported for device: %s"), device);
+                           _("Operation is not supported for device: %s"), errdev);
         } else {
             virJSONValuePtr error = virJSONValueObjectGet(result, "error");
             virReportError(VIR_ERR_INTERNAL_ERROR,

src/qemu/qemu_monitor_json.h

@@ -327,7 +327,8 @@ int qemuMonitorJSONOpenGraphics(qemuMonitorPtr mon,
                                 bool skipauth);
 
 int qemuMonitorJSONSetBlockIoThrottle(qemuMonitorPtr mon,
-                                      const char *device,
+                                      const char *drivealias,
+                                      const char *qomid,
                                       virDomainBlockIoTuneInfoPtr info,
                                       bool supportMaxOptions,
                                       bool supportGroupNameOption,

tests/qemumonitorjsontest.c

@@ -2146,7 +2146,7 @@ testQemuMonitorJSONqemuMonitorJSONSetBlockIoThrottle(const void *data)
         goto cleanup;
 
     if (qemuMonitorJSONSetBlockIoThrottle(qemuMonitorTestGetMonitor(test),
-                                          "drive-virtio-disk1", &info, true,
+                                          "drive-virtio-disk1", NULL, &info, true,
                                           true, true) < 0)
         goto cleanup;