qemu: caps: Always assume QEMU_CAPS_BALLOON_EVENT

The event was added to qemu by commit 973603a813c5d60 which is contained
in the 1.2.0 release.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>

src/qemu/qemu_capabilities.c

@@ -987,7 +987,6 @@ struct virQEMUCapsStringFlags virQEMUCapsMigration[] = {
 };
 
 struct virQEMUCapsStringFlags virQEMUCapsEvents[] = {
-    { "BALLOON_CHANGE", QEMU_CAPS_BALLOON_EVENT },
     { "SPICE_MIGRATE_COMPLETED", QEMU_CAPS_SEAMLESS_MIGRATION },
     { "DEVICE_DELETED", QEMU_CAPS_DEVICE_DEL_EVENT },
     { "MIGRATION", QEMU_CAPS_MIGRATION_EVENT },

src/qemu/qemu_capabilities.h

@@ -183,7 +183,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_DUMP_GUEST_MEMORY, /* dump-guest-memory command */
     QEMU_CAPS_NEC_USB_XHCI, /* -device nec-usb-xhci */
     QEMU_CAPS_VIRTIO_S390, /* -device virtio-*-s390 */
-    QEMU_CAPS_BALLOON_EVENT, /* Async event for balloon changes */
+    X_QEMU_CAPS_BALLOON_EVENT, /* Async event for balloon changes */
 
     /* 100 */
     X_QEMU_CAPS_NETDEV_BRIDGE, /* bridge helper support */

src/qemu/qemu_domain.c

@@ -10262,21 +10262,15 @@ qemuDomainMachineHasBuiltinIDE(const char *machine)
 /**
  * qemuDomainUpdateCurrentMemorySize:
  *
- * Updates the current balloon size from the monitor if necessary. In case when
- * the balloon is not present for the domain, the function recalculates the
- * maximum size to reflect possible changes.
+ * In case when the balloon is not present for the domain, the function
+ * recalculates the maximum size to reflect possible changes.
  *
- * Returns 0 on success and updates vm->def->mem.cur_balloon if necessary, -1 on
- * error and reports libvirt error.
+ * Returns 0 on success and updates vm->def->mem.cur_balloon if necessary.
  */
 int
-qemuDomainUpdateCurrentMemorySize(virQEMUDriverPtr driver,
+qemuDomainUpdateCurrentMemorySize(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
                                   virDomainObjPtr vm)
 {
-    qemuDomainObjPrivatePtr priv = vm->privateData;
-    unsigned long long balloon;
-    int ret = -1;
-
     /* inactive domain doesn't need size update */
     if (!virDomainObjIsActive(vm))
         return 0;
@@ -10288,35 +10282,6 @@ qemuDomainUpdateCurrentMemorySize(virQEMUDriverPtr driver,
         return 0;
     }
 
-    /* current size is always automagically updated via the event */
-    if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BALLOON_EVENT))
-        return 0;
-
-    /* here we need to ask the monitor */
-
-    /* Don't delay if someone's using the monitor, just use existing most
-     * recent data instead */
-    if (qemuDomainJobAllowed(priv, QEMU_JOB_QUERY)) {
-        if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_QUERY) < 0)
-            return -1;
-
-        if (virDomainObjCheckActive(vm) < 0)
-            goto endjob;
-
-        qemuDomainObjEnterMonitor(driver, vm);
-        ret = qemuMonitorGetBalloonInfo(priv->mon, &balloon);
-        if (qemuDomainObjExitMonitor(driver, vm) < 0)
-            ret = -1;
-
- endjob:
-        qemuDomainObjEndJob(driver, vm);
-
-        if (ret < 0)
-            return -1;
-
-        vm->def->mem.cur_balloon = balloon;
-    }
-
     return 0;
 }
 

src/qemu/qemu_driver.c

@@ -20295,22 +20295,18 @@ qemuDomainGetStatsBalloon(virQEMUDriverPtr driver,
                           int *maxparams,
                           unsigned int privflags)
 {
-    qemuDomainObjPrivatePtr priv = dom->privateData;
     virDomainMemoryStatStruct stats[VIR_DOMAIN_MEMORY_STAT_NR];
     int nr_stats;
     unsigned long long cur_balloon = 0;
     size_t i;
-    int err = 0;
 
     if (!virDomainDefHasMemballoon(dom->def)) {
         cur_balloon = virDomainDefGetMemoryTotal(dom->def);
-    } else if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BALLOON_EVENT)) {
-        cur_balloon = dom->def->mem.cur_balloon;
     } else {
-        err = -1;
+        cur_balloon = dom->def->mem.cur_balloon;
     }
 
-    if (!err && virTypedParamsAddULLong(&record->params,
+    if (virTypedParamsAddULLong(&record->params,
                                 &record->nparams,
                                 maxparams,
                                 "balloon.current",

tests/qemucapabilitiesdata/caps_1.5.3.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_1.6.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_1.7.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.1.1.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.10.0.aarch64.xml

@@ -26,7 +26,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.10.0.ppc64.xml

@@ -25,7 +25,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.10.0.s390x.xml

@@ -14,7 +14,6 @@
   <flag name='transaction'/>
   <flag name='block-job-async'/>
   <flag name='dump-guest-memory'/>
-  <flag name='balloon-event'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>
   <flag name='scsi-disk.wwn'/>

tests/qemucapabilitiesdata/caps_2.10.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.11.0.s390x.xml

@@ -14,7 +14,6 @@
   <flag name='transaction'/>
   <flag name='block-job-async'/>
   <flag name='dump-guest-memory'/>
-  <flag name='balloon-event'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>
   <flag name='scsi-disk.wwn'/>

tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.12.0.aarch64.xml

@@ -26,7 +26,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.12.0.ppc64.xml

@@ -25,7 +25,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.12.0.s390x.xml

@@ -14,7 +14,6 @@
   <flag name='transaction'/>
   <flag name='block-job-async'/>
   <flag name='dump-guest-memory'/>
-  <flag name='balloon-event'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>
   <flag name='scsi-disk.wwn'/>

tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.4.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.5.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.6.0.aarch64.xml

@@ -28,7 +28,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.6.0.ppc64.xml

@@ -25,7 +25,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.6.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.7.0.s390x.xml

@@ -14,7 +14,6 @@
   <flag name='transaction'/>
   <flag name='block-job-async'/>
   <flag name='dump-guest-memory'/>
-  <flag name='balloon-event'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>
   <flag name='scsi-disk.wwn'/>

tests/qemucapabilitiesdata/caps_2.7.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.8.0.s390x.xml

@@ -14,7 +14,6 @@
   <flag name='transaction'/>
   <flag name='block-job-async'/>
   <flag name='dump-guest-memory'/>
-  <flag name='balloon-event'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>
   <flag name='scsi-disk.wwn'/>

tests/qemucapabilitiesdata/caps_2.8.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.9.0.ppc64.xml

@@ -25,7 +25,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_2.9.0.s390x.xml

@@ -14,7 +14,6 @@
   <flag name='transaction'/>
   <flag name='block-job-async'/>
   <flag name='dump-guest-memory'/>
-  <flag name='balloon-event'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>
   <flag name='scsi-disk.wwn'/>

tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_3.0.0.ppc64.xml

@@ -25,7 +25,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_3.0.0.riscv32.xml

@@ -8,7 +8,6 @@
   <flag name='transaction'/>
   <flag name='block-job-async'/>
   <flag name='dump-guest-memory'/>
-  <flag name='balloon-event'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='scsi-disk.wwn'/>
   <flag name='seccomp-sandbox'/>

tests/qemucapabilitiesdata/caps_3.0.0.riscv64.xml

@@ -8,7 +8,6 @@
   <flag name='transaction'/>
   <flag name='block-job-async'/>
   <flag name='dump-guest-memory'/>
-  <flag name='balloon-event'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='scsi-disk.wwn'/>
   <flag name='seccomp-sandbox'/>

tests/qemucapabilitiesdata/caps_3.0.0.s390x.xml

@@ -15,7 +15,6 @@
   <flag name='transaction'/>
   <flag name='block-job-async'/>
   <flag name='dump-guest-memory'/>
-  <flag name='balloon-event'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>
   <flag name='usb-redir.filter'/>

tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_3.1.0.ppc64.xml

@@ -25,7 +25,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_3.1.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_4.0.0.riscv32.xml

@@ -28,7 +28,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_4.0.0.riscv64.xml

@@ -28,7 +28,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>

tests/qemucapabilitiesdata/caps_4.0.0.x86_64.xml

@@ -32,7 +32,6 @@
   <flag name='hda-micro'/>
   <flag name='dump-guest-memory'/>
   <flag name='nec-usb-xhci'/>
-  <flag name='balloon-event'/>
   <flag name='lsi'/>
   <flag name='virtio-scsi-pci'/>
   <flag name='blockio'/>