qemu: Add the group name option to the iotune command line

Add in the block I/O throttling group parameter to the command line
if supported. If not supported, fail command creation.

Add the xml2argvtest for testing.

Signed-off-by: John Ferlan <jferlan@redhat.com>

src/qemu/qemu_command.c

@@ -1790,6 +1790,15 @@ qemuBuildDriveStr(virDomainDiskDefPtr disk,
         goto error;
     }
 
+    /* block I/O group 2.4 */
+    if (disk->blkdeviotune.group_name &&
+        !virQEMUCapsGet(qemuCaps, QEMU_CAPS_DRIVE_IOTUNE_GROUP)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("the block I/O throttling group parameter is "
+                         "not supported with this QEMU binary"));
+        goto error;
+    }
+
     /* block I/O throttling length 2.6 */
     if ((disk->blkdeviotune.total_bytes_sec_max_length ||
          disk->blkdeviotune.read_bytes_sec_max_length ||
@@ -1844,6 +1853,10 @@ qemuBuildDriveStr(virDomainDiskDefPtr disk,
     IOTUNE_ADD(write_iops_sec_max, "iops-write-max");
 
     IOTUNE_ADD(size_iops_sec, "iops-size");
+    if (disk->blkdeviotune.group_name) {
+        virBufferEscapeString(&opt, ",throttling.group=%s",
+                              disk->blkdeviotune.group_name);
+    }
 
     IOTUNE_ADD(total_bytes_sec_max_length, "bps-total-max-length");
     IOTUNE_ADD(read_bytes_sec_max_length, "bps-read-max-length");

tests/qemuxml2argvdata/qemuxml2argv-blkdeviotune-group-num.args

@@ -0,0 +1,32 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu \
+-name QEMUGuest1 \
+-S \
+-M pc \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-QEMUGuest1/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-drive file=/dev/HostVG/QEMUGuest1,format=qcow2,if=none,id=drive-ide0-0-0,\
+cache=none,throttling.bps-total=5000,throttling.iops-total=6000,\
+throttling.bps-total-max=10000,throttling.iops-total-max=11000,\
+throttling.group=libvirt_iotune_group1 \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-drive file=/dev/HostVG/QEMUGuest2,format=qcow2,if=none,id=drive-ide0-0-1,\
+cache=none,throttling.bps-read=5000,throttling.bps-write=5500,\
+throttling.iops-read=3500,throttling.iops-write=4000,\
+throttling.bps-read-max=6000,throttling.bps-write-max=6500,\
+throttling.iops-read-max=7000,throttling.iops-write-max=7500,\
+throttling.iops-size=2000,throttling.group=libvirt_iotune_group2 \
+-device ide-drive,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

tests/qemuxml2argvtest.c

@@ -1570,6 +1570,10 @@ mymain(void)
     DO_TEST("blkdeviotune-max",
             QEMU_CAPS_DRIVE_IOTUNE,
             QEMU_CAPS_DRIVE_IOTUNE_MAX);
+    DO_TEST("blkdeviotune-group-num",
+            QEMU_CAPS_DRIVE_IOTUNE,
+            QEMU_CAPS_DRIVE_IOTUNE_MAX,
+            QEMU_CAPS_DRIVE_IOTUNE_GROUP);
     DO_TEST("blkdeviotune-max-length",
             QEMU_CAPS_DRIVE_IOTUNE,
             QEMU_CAPS_DRIVE_IOTUNE_MAX,