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Copyright 2015-2017 Open Platform for NFV Project, Inc. and its contributors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
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/*
 * Generic Balloon handlers and management
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 * Copyright (C) 2011 Red Hat, Inc.
 * Copyright (C) 2011 Amit Shah <amit.shah@redhat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.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;

bool qemu_balloon_is_inhibited(void)
{
    return balloon_inhibited;
}

void qemu_balloon_inhibit(bool state)
{
    balloon_inhibited = state;
}

static bool have_balloon(Error **errp)
{
    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;
}

int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
                             QEMUBalloonStatus *stat_func, void *opaque)
{
    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 qemu_remove_balloon_handler(void *opaque)
{
    if (balloon_opaque != opaque) {
        return;
    }
    balloon_event_fn = NULL;
    balloon_stat_fn = NULL;
    balloon_opaque = NULL;
}

BalloonInfo *qmp_query_balloon(Error **errp)
{
    BalloonInfo *info;

    if (!have_balloon(errp)) {
        return NULL;
    }

    info = g_malloc0(sizeof(*info));
    balloon_stat_fn(balloon_opaque, info);
    return info;
}

void qmp_balloon(int64_t target, Error **errp)
{
    if (!have_balloon(errp)) {
        return;
    }

    if (target <= 0) {
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "target", "a size");
        return;
    }

    trace_balloon_event(balloon_opaque, target);
    balloon_event_fn(balloon_opaque, target);
}