/* * 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 "monitor/monitor.h" #include "exec/cpu-common.h" #include "sysemu/kvm.h" #include "sysemu/balloon.h" #include "trace.h" #include "qmp-commands.h" #include "qapi/qmp/qjson.h" static QEMUBalloonEvent *balloon_event_fn; static QEMUBalloonStatus *balloon_stat_fn; static void *balloon_opaque; 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? */ error_report("Another balloon device already registered"); 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; } static int qemu_balloon(ram_addr_t target) { if (!balloon_event_fn) { return 0; } trace_balloon_event(balloon_opaque, target); balloon_event_fn(balloon_opaque, target); return 1; } static int qemu_balloon_status(BalloonInfo *info) { if (!balloon_stat_fn) { return 0; } balloon_stat_fn(balloon_opaque, info); return 1; } BalloonInfo *qmp_query_balloon(Error **errp) { BalloonInfo *info; if (kvm_enabled() && !kvm_has_sync_mmu()) { error_set(errp, QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); return NULL; } info = g_malloc0(sizeof(*info)); if (qemu_balloon_status(info) == 0) { error_set(errp, QERR_DEVICE_NOT_ACTIVE, "balloon"); qapi_free_BalloonInfo(info); return NULL; } return info; } void qmp_balloon(int64_t value, Error **errp) { if (kvm_enabled() && !kvm_has_sync_mmu()) { error_set(errp, QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); return; } if (value <= 0) { error_set(errp, QERR_INVALID_PARAMETER_VALUE, "target", "a size"); return; } if (qemu_balloon(value) == 0) { error_set(errp, QERR_DEVICE_NOT_ACTIVE, "balloon"); } }