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https://github.com/xemu-project/xemu.git
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96637bcdf9
Please, note that some of the code supporting memory statistics is still around (eg. virtio_balloon_receive_stats() and reset_stats()). Also, the qmp_query_balloon() function is synchronous and thus doesn't make any use of the (not fully working) monitor's asynchronous command support (the old non-qapi implementation did). Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/*
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* Generic Balloon handlers and management
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (C) 2011 Red Hat, Inc.
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* Copyright (C) 2011 Amit Shah <amit.shah@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "monitor.h"
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#include "cpu-common.h"
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#include "kvm.h"
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#include "balloon.h"
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#include "trace.h"
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#include "qmp-commands.h"
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static QEMUBalloonEvent *balloon_event_fn;
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static QEMUBalloonStatus *balloon_stat_fn;
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static void *balloon_opaque;
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int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
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QEMUBalloonStatus *stat_func, void *opaque)
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{
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if (balloon_event_fn || balloon_stat_fn || balloon_opaque) {
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/* We're already registered one balloon handler. How many can
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* a guest really have?
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*/
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error_report("Another balloon device already registered");
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return -1;
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}
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balloon_event_fn = event_func;
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balloon_stat_fn = stat_func;
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balloon_opaque = opaque;
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return 0;
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}
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void qemu_remove_balloon_handler(void *opaque)
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{
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if (balloon_opaque != opaque) {
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return;
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}
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balloon_event_fn = NULL;
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balloon_stat_fn = NULL;
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balloon_opaque = NULL;
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}
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static int qemu_balloon(ram_addr_t target)
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{
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if (!balloon_event_fn) {
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return 0;
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}
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trace_balloon_event(balloon_opaque, target);
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balloon_event_fn(balloon_opaque, target);
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return 1;
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}
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static int qemu_balloon_status(BalloonInfo *info)
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{
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if (!balloon_stat_fn) {
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return 0;
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}
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balloon_stat_fn(balloon_opaque, info);
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return 1;
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}
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BalloonInfo *qmp_query_balloon(Error **errp)
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{
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BalloonInfo *info;
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if (kvm_enabled() && !kvm_has_sync_mmu()) {
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error_set(errp, QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
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return NULL;
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}
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info = g_malloc0(sizeof(*info));
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if (qemu_balloon_status(info) == 0) {
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error_set(errp, QERR_DEVICE_NOT_ACTIVE, "balloon");
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qapi_free_BalloonInfo(info);
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return NULL;
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}
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return info;
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}
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/**
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* do_balloon(): Request VM to change its memory allocation
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*/
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int do_balloon(Monitor *mon, const QDict *params,
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MonitorCompletion cb, void *opaque)
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{
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int64_t target;
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int ret;
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if (kvm_enabled() && !kvm_has_sync_mmu()) {
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qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
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return -1;
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}
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target = qdict_get_int(params, "value");
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if (target <= 0) {
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qerror_report(QERR_INVALID_PARAMETER_VALUE, "target", "a size");
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return -1;
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}
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ret = qemu_balloon(target);
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if (ret == 0) {
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qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
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return -1;
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}
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cb(opaque, NULL);
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return 0;
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}
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