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Wire up handling for QMP's BALLOON_EVENT

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If QEMU supports the BALLOON_EVENT QMP event, then we can
avoid invoking 'query-balloon' when returning XML or the
domain info.

* src/qemu/qemu_capabilities.c, src/qemu/qemu_capabilities.h:
  Add QEMU_CAPS_BALLOON_EVENT
* src/qemu/qemu_driver.c: Skip query-balloon in
  qemudDomainGetInfo and qemuDomainGetXMLDesc if we have
  QEMU_CAPS_BALLOON_EVENT set
* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Check
  for BALLOON_EVENT at connect to monitor. Add callback
  for balloon change notifications
* src/qemu/qemu_monitor_json.c, src/qemu/qemu_monitor_json.h:
  Add handling of BALLOON_EVENT and impl 'query-events'
  check

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2012-07-12 23:45:57 +08:00 committed by Guannan Ren
parent 7ed6d7dda7
commit 1d9d5103b4
8 changed files with 128 additions and 2 deletions
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1
src/qemu/qemu_capabilities.c
View File

@ -167,6 +167,7 @@ VIR_ENUM_IMPL(qemuCaps, QEMU_CAPS_LAST,
"dump-guest-memory",
"nec-usb-xhci",
"virtio-s390",
"balloon-event",
);

1
src/qemu/qemu_capabilities.h
View File

@ -134,6 +134,7 @@ enum qemuCapsFlags {
QEMU_CAPS_DUMP_GUEST_MEMORY = 96, /* dump-guest-memory command */
QEMU_CAPS_NEC_USB_XHCI = 97, /* -device nec-usb-xhci */
QEMU_CAPS_VIRTIO_S390 = 98, /* -device virtio-*-s390 */
QEMU_CAPS_BALLOON_EVENT = 99, /* Async event for balloon changes */
QEMU_CAPS_LAST, /* this must always be the last item */
};

7
src/qemu/qemu_driver.c
View File

@ -2234,6 +2234,8 @@ static int qemudDomainGetInfo(virDomainPtr dom,
if ((vm->def->memballoon != NULL) &&
(vm->def->memballoon->model == VIR_DOMAIN_MEMBALLOON_MODEL_NONE)) {
info->memory = vm->def->mem.max_balloon;
} else if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_BALLOON_EVENT)) {
info->memory = vm->def->mem.cur_balloon;
} else if (qemuDomainJobAllowed(priv, QEMU_JOB_QUERY)) {
if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_QUERY) < 0)
goto cleanup;
@ -4560,6 +4562,7 @@ static char *qemuDomainGetXMLDesc(virDomainPtr dom,
char *ret = NULL;
unsigned long long balloon;
int err = 0;
qemuDomainObjPrivatePtr priv;
/* Flags checked by virDomainDefFormat */
@ -4574,11 +4577,13 @@ static char *qemuDomainGetXMLDesc(virDomainPtr dom,
goto cleanup;
}
priv = vm->privateData;
/* Refresh current memory based on balloon info if supported */
if ((vm->def->memballoon != NULL) &&
(vm->def->memballoon->model != VIR_DOMAIN_MEMBALLOON_MODEL_NONE) &&
!qemuCapsGet(priv->qemuCaps, QEMU_CAPS_BALLOON_EVENT) &&
(virDomainObjIsActive(vm))) {
qemuDomainObjPrivatePtr priv = vm->privateData;
/* Don't delay if someone's using the monitor, just use
* existing most recent data instead */
if (qemuDomainJobAllowed(priv, QEMU_JOB_QUERY)) {

18
src/qemu/qemu_monitor.c
View File

@ -1086,6 +1086,16 @@ int qemuMonitorEmitBlockJob(qemuMonitorPtr mon,
}
int qemuMonitorEmitBalloonChange(qemuMonitorPtr mon,
unsigned long long actual)
{
int ret = -1;
VIR_DEBUG("mon=%p", mon);
QEMU_MONITOR_CALLBACK(mon, ret, domainBalloonChange, mon->vm, actual);
return ret;
}
int qemuMonitorSetCapabilities(qemuMonitorPtr mon,
virBitmapPtr qemuCaps)
@ -1102,11 +1112,17 @@ int qemuMonitorSetCapabilities(qemuMonitorPtr mon,
if (mon->json) {
ret = qemuMonitorJSONSetCapabilities(mon);
if (ret)
if (ret < 0)
goto cleanup;
ret = qemuMonitorJSONCheckCommands(mon, qemuCaps, &json_hmp);
if (ret < 0)
goto cleanup;
mon->json_hmp = json_hmp > 0;
ret = qemuMonitorJSONCheckEvents(mon, qemuCaps);
if (ret < 0)
goto cleanup;
} else {
ret = 0;
}

5
src/qemu/qemu_monitor.h
View File

@ -133,6 +133,9 @@ struct _qemuMonitorCallbacks {
virDomainObjPtr vm);
int (*domainPMSuspend)(qemuMonitorPtr mon,
virDomainObjPtr vm);
int (*domainBalloonChange)(qemuMonitorPtr mon,
virDomainObjPtr vm,
unsigned long long actual);
};
char *qemuMonitorEscapeArg(const char *in);
@ -208,6 +211,8 @@ int qemuMonitorEmitBlockJob(qemuMonitorPtr mon,
const char *diskAlias,
int type,
int status);
int qemuMonitorEmitBalloonChange(qemuMonitorPtr mon,
unsigned long long actual);
int qemuMonitorStartCPUs(qemuMonitorPtr mon,
virConnectPtr conn);

65
src/qemu/qemu_monitor_json.c
View File

@ -69,6 +69,7 @@ static void qemuMonitorJSONHandlePMWakeup(qemuMonitorPtr mon, virJSONValuePtr da
static void qemuMonitorJSONHandlePMSuspend(qemuMonitorPtr mon, virJSONValuePtr data);
static void qemuMonitorJSONHandleBlockJobCompleted(qemuMonitorPtr mon, virJSONValuePtr data);
static void qemuMonitorJSONHandleBlockJobCanceled(qemuMonitorPtr mon, virJSONValuePtr data);
static void qemuMonitorJSONHandleBalloonChange(qemuMonitorPtr mon, virJSONValuePtr data);
typedef struct {
const char *type;
@ -76,6 +77,7 @@ typedef struct {
} qemuEventHandler;
static qemuEventHandler eventHandlers[] = {
{ "BALLOON_CHANGE", qemuMonitorJSONHandleBalloonChange, },
{ "BLOCK_IO_ERROR", qemuMonitorJSONHandleIOError, },
{ "BLOCK_JOB_CANCELLED", qemuMonitorJSONHandleBlockJobCanceled, },
{ "BLOCK_JOB_COMPLETED", qemuMonitorJSONHandleBlockJobCompleted, },
@ -875,6 +877,19 @@ qemuMonitorJSONHandleBlockJobCanceled(qemuMonitorPtr mon,
VIR_DOMAIN_BLOCK_JOB_CANCELED);
}
static void
qemuMonitorJSONHandleBalloonChange(qemuMonitorPtr mon,
virJSONValuePtr data)
{
unsigned long long actual = 0;
if (virJSONValueObjectGetNumberUlong(data, "actual", &actual) < 0) {
VIR_WARN("missing actual in balloon change event");
return;
}
actual = VIR_DIV_UP(actual, 1024);
qemuMonitorEmitBalloonChange(mon, actual);
}
int
qemuMonitorJSONHumanCommandWithFd(qemuMonitorPtr mon,
const char *cmd_str,
@ -1003,6 +1018,56 @@ cleanup:
}
int
qemuMonitorJSONCheckEvents(qemuMonitorPtr mon,
virBitmapPtr qemuCaps)
{
int ret = -1;
virJSONValuePtr cmd = qemuMonitorJSONMakeCommand("query-events", NULL);
virJSONValuePtr reply = NULL;
virJSONValuePtr data;
int i, n;
if (!cmd)
return ret;
if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
goto cleanup;
if (qemuMonitorJSONHasError(reply, "CommandNotFound")) {
ret = 0;
goto cleanup;
}
if (qemuMonitorJSONCheckError(cmd, reply) < 0)
goto cleanup;
if (!(data = virJSONValueObjectGet(reply, "return")) ||
data->type != VIR_JSON_TYPE_ARRAY ||
(n = virJSONValueArraySize(data)) <= 0)
goto cleanup;
for (i = 0; i < n; i++) {
virJSONValuePtr entry;
const char *name;
if (!(entry = virJSONValueArrayGet(data, i)) ||
!(name = virJSONValueObjectGetString(entry, "name")))
goto cleanup;
if (STREQ(name, "BALLOON_CHANGE"))
qemuCapsSet(qemuCaps, QEMU_CAPS_BALLOON_EVENT);
}
ret = 0;
cleanup:
virJSONValueFree(cmd);
virJSONValueFree(reply);
return ret;
}
int
qemuMonitorJSONStartCPUs(qemuMonitorPtr mon,
virConnectPtr conn ATTRIBUTE_UNUSED)

2
src/qemu/qemu_monitor_json.h
View File

@ -45,6 +45,8 @@ int qemuMonitorJSONSetCapabilities(qemuMonitorPtr mon);
int qemuMonitorJSONCheckCommands(qemuMonitorPtr mon,
virBitmapPtr qemuCaps,
int *json_hmp);
int qemuMonitorJSONCheckEvents(qemuMonitorPtr mon,
virBitmapPtr qemuCaps);
int qemuMonitorJSONStartCPUs(qemuMonitorPtr mon,
virConnectPtr conn);

31
src/qemu/qemu_process.c
View File

@ -1148,6 +1148,36 @@ qemuProcessHandlePMSuspend(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
return 0;
}
static int
qemuProcessHandleBalloonChange(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
virDomainObjPtr vm,
unsigned long long actual)
{
struct qemud_driver *driver = qemu_driver;
virDomainEventPtr event;
virDomainObjLock(vm);
event = virDomainEventBalloonChangeNewFromObj(vm, actual);
VIR_DEBUG("Updating balloon from %lld to %lld kb",
vm->def->mem.cur_balloon, actual);
vm->def->mem.cur_balloon = actual;
if (virDomainSaveStatus(driver->caps, driver->stateDir, vm) < 0)
VIR_WARN("unable to save domain status with balloon change");
virDomainObjUnlock(vm);
if (event) {
qemuDriverLock(driver);
qemuDomainEventQueue(driver, event);
qemuDriverUnlock(driver);
}
return 0;
}
static qemuMonitorCallbacks monitorCallbacks = {
.destroy = qemuProcessHandleMonitorDestroy,
.eofNotify = qemuProcessHandleMonitorEOF,
@ -1164,6 +1194,7 @@ static qemuMonitorCallbacks monitorCallbacks = {
.domainTrayChange = qemuProcessHandleTrayChange,
.domainPMWakeup = qemuProcessHandlePMWakeup,
.domainPMSuspend = qemuProcessHandlePMSuspend,
.domainBalloonChange = qemuProcessHandleBalloonChange,
};
static int