/*
- * QEMU System Emulator
+ * Generic Balloon handlers and management
*
* Copyright (c) 2003-2008 Fabrice Bellard
+ * Copyright (C) 2011 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* THE SOFTWARE.
*/
-#include "monitor.h"
-#include "qjson.h"
-#include "qint.h"
-#include "cpu-common.h"
-#include "kvm.h"
-#include "balloon.h"
+#include "qemu-common.h"
+#include "exec/cpu-common.h"
+#include "sysemu/kvm.h"
+#include "sysemu/balloon.h"
#include "trace.h"
+#include "qmp-commands.h"
+#include "qapi/qmp/qerror.h"
+#include "qapi/qmp/qjson.h"
+static QEMUBalloonEvent *balloon_event_fn;
+static QEMUBalloonStatus *balloon_stat_fn;
+static void *balloon_opaque;
+static bool balloon_inhibited;
-static QEMUBalloonEvent *qemu_balloon_event;
-void *qemu_balloon_event_opaque;
-
-void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
+bool qemu_balloon_is_inhibited(void)
{
- qemu_balloon_event = func;
- qemu_balloon_event_opaque = opaque;
+ return balloon_inhibited;
}
-int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque)
+void qemu_balloon_inhibit(bool state)
{
- if (qemu_balloon_event) {
- trace_balloon_event(qemu_balloon_event_opaque, target);
- qemu_balloon_event(qemu_balloon_event_opaque, target, cb, opaque);
- return 1;
- } else {
- return 0;
- }
+ balloon_inhibited = state;
}
-int qemu_balloon_status(MonitorCompletion cb, void *opaque)
+static bool have_balloon(Error **errp)
{
- if (qemu_balloon_event) {
- qemu_balloon_event(qemu_balloon_event_opaque, 0, cb, opaque);
- return 1;
- } else {
- return 0;
+ if (kvm_enabled() && !kvm_has_sync_mmu()) {
+ error_set(errp, ERROR_CLASS_KVM_MISSING_CAP,
+ "Using KVM without synchronous MMU, balloon unavailable");
+ return false;
+ }
+ if (!balloon_event_fn) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
+ "No balloon device has been activated");
+ return false;
}
+ return true;
}
-static void print_balloon_stat(const char *key, QObject *obj, void *opaque)
+int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
+ QEMUBalloonStatus *stat_func, void *opaque)
{
- Monitor *mon = opaque;
-
- if (strcmp(key, "actual"))
- monitor_printf(mon, ",%s=%" PRId64, key,
- qint_get_int(qobject_to_qint(obj)));
+ if (balloon_event_fn || balloon_stat_fn || balloon_opaque) {
+ /* We're already registered one balloon handler. How many can
+ * a guest really have?
+ */
+ return -1;
+ }
+ balloon_event_fn = event_func;
+ balloon_stat_fn = stat_func;
+ balloon_opaque = opaque;
+ return 0;
}
-void monitor_print_balloon(Monitor *mon, const QObject *data)
+void qemu_remove_balloon_handler(void *opaque)
{
- QDict *qdict;
-
- qdict = qobject_to_qdict(data);
- if (!qdict_haskey(qdict, "actual"))
+ if (balloon_opaque != opaque) {
return;
-
- monitor_printf(mon, "balloon: actual=%" PRId64,
- qdict_get_int(qdict, "actual") >> 20);
- qdict_iter(qdict, print_balloon_stat, mon);
- monitor_printf(mon, "\n");
+ }
+ balloon_event_fn = NULL;
+ balloon_stat_fn = NULL;
+ balloon_opaque = NULL;
}
-/**
- * do_info_balloon(): Balloon information
- *
- * Make an asynchronous request for balloon info. When the request completes
- * a QDict will be returned according to the following specification:
- *
- * - "actual": current balloon value in bytes
- * The following fields may or may not be present:
- * - "mem_swapped_in": Amount of memory swapped in (bytes)
- * - "mem_swapped_out": Amount of memory swapped out (bytes)
- * - "major_page_faults": Number of major faults
- * - "minor_page_faults": Number of minor faults
- * - "free_mem": Total amount of free and unused memory (bytes)
- * - "total_mem": Total amount of available memory (bytes)
- *
- * Example:
- *
- * { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0,
- * "major_page_faults": 142, "minor_page_faults": 239245,
- * "free_mem": 1014185984, "total_mem": 1044668416 }
- */
-int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque)
+BalloonInfo *qmp_query_balloon(Error **errp)
{
- int ret;
-
- if (kvm_enabled() && !kvm_has_sync_mmu()) {
- qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
- return -1;
- }
+ BalloonInfo *info;
- ret = qemu_balloon_status(cb, opaque);
- if (!ret) {
- qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
- return -1;
+ if (!have_balloon(errp)) {
+ return NULL;
}
- return 0;
+ info = g_malloc0(sizeof(*info));
+ balloon_stat_fn(balloon_opaque, info);
+ return info;
}
-/**
- * do_balloon(): Request VM to change its memory allocation
- */
-int do_balloon(Monitor *mon, const QDict *params,
- MonitorCompletion cb, void *opaque)
+void qmp_balloon(int64_t target, Error **errp)
{
- int ret;
-
- if (kvm_enabled() && !kvm_has_sync_mmu()) {
- qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
- return -1;
+ if (!have_balloon(errp)) {
+ return;
}
- ret = qemu_balloon(qdict_get_int(params, "value"), cb, opaque);
- if (ret == 0) {
- qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
- return -1;
+ if (target <= 0) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "target", "a size");
+ return;
}
- cb(opaque, NULL);
- return 0;
+ trace_balloon_event(balloon_opaque, target);
+ balloon_event_fn(balloon_opaque, target);
}
projects / qemu.git / blobdiff