qemu: add support of optional 'autodeflate' attribute

Autodeflate can be enabled/disabled for memballon device
of model 'virtio'.

xml:
<devices>
  <memballoon model='virtio' autodeflate='on'/>
</devices>

qemu:
qemu -device virtio-balloon-pci,...,deflate-on-oom=on

Autodeflate cannot be enabled/disabled for running domain.

src/qemu/qemu_command.c

@@ -5758,6 +5758,17 @@ qemuBuildMemballoonDevStr(virDomainDefPtr def,
     if (qemuBuildDeviceAddressStr(&buf, def, &dev->info, qemuCaps) < 0)
         goto error;
 
+    if (dev->autodeflate != VIR_TRISTATE_SWITCH_ABSENT) {
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_BALLOON_AUTODEFLATE)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("deflate-on-oom is not supported by this QEMU binary"));
+            goto error;
+        }
+
+        virBufferAsprintf(&buf, ",deflate-on-oom=%s",
+                          virTristateSwitchTypeToString(dev->autodeflate));
+    }
+
     if (virBufferCheckError(&buf) < 0)
         goto error;
 

tests/qemuxml2argvdata/qemuxml2argv-balloon-ccw-deflate.args

+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu \
+-name QEMUGuest1 \
+-S \
+-M s390-ccw \
+-m 214 \
+-smp 1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefconfig \
+-nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait \
+-no-acpi \
+-boot c \
+-device virtio-balloon-ccw,id=balloon0,devno=fe.0.000a,deflate-on-oom=on

tests/qemuxml2argvdata/qemuxml2argv-balloon-ccw-deflate.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='s390x' machine='s390-ccw'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <memballoon model='virtio' autodeflate='on'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0a'/>
+    </memballoon>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-balloon-device-deflate-off.args

+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 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefconfig \
+-nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x12,deflate-on-oom=off

tests/qemuxml2argvdata/qemuxml2argv-balloon-device-deflate-off.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <memballoon model='virtio' autodeflate='off'>
+      <address type='pci' domain='0' bus='0' slot='18' function='0'/>
+    </memballoon>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-balloon-device-deflate.args

+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 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefconfig \
+-nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x12,deflate-on-oom=on

tests/qemuxml2argvdata/qemuxml2argv-balloon-device-deflate.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <memballoon model='virtio' autodeflate='on'>
+      <address type='pci' domain='0' bus='0' slot='18' function='0'/>
+    </memballoon>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-balloon-mmio-deflate.args

+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-aarch64 \
+-name aarch64test \
+-S \
+-M virt \
+-cpu cortex-a53 \
+-m 1024 \
+-smp 1 \
+-uuid 496d7ea8-9739-544b-4ebd-ef08be936e8b \
+-nographic \
+-nodefconfig \
+-nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait \
+-boot c \
+-kernel /aarch64.kernel \
+-initrd /aarch64.initrd \
+-append 'earlyprintk console=ttyAMA0,115200n8 rw root=/dev/vda rootwait' \
+-dtb /aarch64.dtb \
+-usb \
+-device virtio-balloon-device,id=balloon0,deflate-on-oom=on

tests/qemuxml2argvdata/qemuxml2argv-balloon-mmio-deflate.xml

+<domain type="qemu">
+  <name>aarch64test</name>
+  <uuid>496d7ea8-9739-544b-4ebd-ef08be936e8b</uuid>
+  <memory>1048576</memory>
+  <currentMemory>1048576</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch="aarch64" machine="virt">hvm</type>
+    <kernel>/aarch64.kernel</kernel>
+    <initrd>/aarch64.initrd</initrd>
+    <dtb>/aarch64.dtb</dtb>
+    <cmdline>earlyprintk console=ttyAMA0,115200n8 rw root=/dev/vda rootwait</cmdline>
+  </os>
+  <features>
+    <acpi/>
+    <apic/>
+    <pae/>
+  </features>
+  <cpu match='exact'>
+    <model>cortex-a53</model>
+  </cpu>
+  <clock offset="utc"/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>restart</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-aarch64</emulator>
+    <memballoon model='virtio' autodeflate='on'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1210,6 +1210,15 @@ mymain(void)
             QEMU_CAPS_DEVICE, QEMU_CAPS_CHARDEV, QEMU_CAPS_NODEFCONFIG,
             QEMU_CAPS_BOOTINDEX, QEMU_CAPS_VIRTIO_S390);
     DO_TEST("balloon-device", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
+    DO_TEST("balloon-device-deflate", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG,
+            QEMU_CAPS_VIRTIO_BALLOON_AUTODEFLATE);
+    DO_TEST("balloon-ccw-deflate", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG,
+            QEMU_CAPS_VIRTIO_BALLOON_AUTODEFLATE);
+    DO_TEST("balloon-mmio-deflate", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG,
+            QEMU_CAPS_DTB, QEMU_CAPS_DEVICE_VIRTIO_MMIO,
+            QEMU_CAPS_VIRTIO_BALLOON_AUTODEFLATE);
+    DO_TEST("balloon-device-deflate-off", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG,
+            QEMU_CAPS_VIRTIO_BALLOON_AUTODEFLATE);
     DO_TEST("balloon-device-auto",
             QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("balloon-device-period", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);