Exemple #1
0
/**
 * do_balloon(): Request VM to change its memory allocation
 */
int do_balloon(Monitor *mon, const QDict *params,
	       MonitorCompletion cb, void *opaque)
{
    int64_t target;
    int ret;

    if (kvm_enabled() && !kvm_has_sync_mmu()) {
        qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
        return -1;
    }

    target = qdict_get_int(params, "value");
    if (target <= 0) {
        qerror_report(QERR_INVALID_PARAMETER_VALUE, "target", "a size");
        return -1;
    }
    ret = qemu_balloon(target);
    if (ret == 0) {
        qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
        return -1;
    }

    cb(opaque, NULL);
    return 0;
}
Exemple #2
0
static void balloon_page(void *addr, int deflate)
{
#if defined(__linux__)
    if (!kvm_enabled() || kvm_has_sync_mmu())
        qemu_madvise(addr, TARGET_PAGE_SIZE,
                     deflate ? QEMU_MADV_WILLNEED : QEMU_MADV_DONTNEED);
#endif
}
Exemple #3
0
static void balloon_page(void *addr, int deflate)
{
    if (!qemu_balloon_is_inhibited() && (!kvm_enabled() ||
                                         kvm_has_sync_mmu())) {
        qemu_madvise(addr, BALLOON_PAGE_SIZE,
                deflate ? QEMU_MADV_WILLNEED : QEMU_MADV_DONTNEED);
    }
}
Exemple #4
0
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;
}
Exemple #5
0
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");
    }
}
Exemple #6
0
/**
 * 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)
{
    int ret;

    if (kvm_enabled() && !kvm_has_sync_mmu()) {
        qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
        return -1;
    }

    ret = qemu_balloon_status(cb, opaque);
    if (!ret) {
        qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
        return -1;
    }

    return 0;
}
Exemple #7
0
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;
}
Exemple #8
0
int ram_load(QEMUFile *f, void *opaque, int version_id)
{
    ram_addr_t addr;
    int flags;

    if (version_id != 3) {
        return -EINVAL;
    }

    do {
        addr = qemu_get_be64(f);

        flags = addr & ~TARGET_PAGE_MASK;
        addr &= TARGET_PAGE_MASK;

        if (flags & RAM_SAVE_FLAG_MEM_SIZE) {
            if (addr != last_ram_offset) {
                return -EINVAL;
            }
        }

        if (flags & RAM_SAVE_FLAG_COMPRESS) {
            uint8_t ch = qemu_get_byte(f);
            memset(qemu_get_ram_ptr(addr), ch, TARGET_PAGE_SIZE);
#ifndef _WIN32
            if (ch == 0 &&
                (!kvm_enabled() || kvm_has_sync_mmu())) {
                madvise(qemu_get_ram_ptr(addr), TARGET_PAGE_SIZE,
                        MADV_DONTNEED);
            }
#endif
        } else if (flags & RAM_SAVE_FLAG_PAGE) {
            qemu_get_buffer(f, qemu_get_ram_ptr(addr), TARGET_PAGE_SIZE);
        }
        if (qemu_file_has_error(f)) {
            return -EIO;
        }
    } while (!(flags & RAM_SAVE_FLAG_EOS));

    return 0;
}