pc-dimm: do not allow setting an in-use memdev

[qemu.git] / hw / mem / pc-dimm.c

/*
 * Dimm device for Memory Hotplug
 *
 * Copyright ProfitBricks GmbH 2012
 * Copyright (C) 2014 Red Hat Inc
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>
 */

#include "hw/mem/pc-dimm.h"
#include "qemu/config-file.h"
#include "qapi/visitor.h"

static Property pc_dimm_properties[] = {
    DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0),
    DEFINE_PROP_UINT32(PC_DIMM_NODE_PROP, PCDIMMDevice, node, 0),
    DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot,
                      PC_DIMM_UNASSIGNED_SLOT),
    DEFINE_PROP_END_OF_LIST(),
};

static void pc_dimm_get_size(Object *obj, Visitor *v, void *opaque,
                          const char *name, Error **errp)
{
    int64_t value;
    MemoryRegion *mr;
    PCDIMMDevice *dimm = PC_DIMM(obj);

    mr = host_memory_backend_get_memory(dimm->hostmem, errp);
    value = memory_region_size(mr);

    visit_type_int(v, &value, name, errp);
}

static void pc_dimm_check_memdev_is_busy(Object *obj, const char *name,
                                      Object *val, Error **errp)
{
    MemoryRegion *mr;

    mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), errp);
    if (memory_region_is_mapped(mr)) {
        char *path = object_get_canonical_path_component(val);
        error_setg(errp, "can't use already busy memdev: %s", path);
        g_free(path);
    } else {
        qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
    }
}

static void pc_dimm_init(Object *obj)
{
    PCDIMMDevice *dimm = PC_DIMM(obj);

    object_property_add(obj, PC_DIMM_SIZE_PROP, "int", pc_dimm_get_size,
                        NULL, NULL, NULL, &error_abort);
    object_property_add_link(obj, PC_DIMM_MEMDEV_PROP, TYPE_MEMORY_BACKEND,
                             (Object **)&dimm->hostmem,
                             pc_dimm_check_memdev_is_busy,
                             OBJ_PROP_LINK_UNREF_ON_RELEASE,
                             &error_abort);
}

static void pc_dimm_realize(DeviceState *dev, Error **errp)
{
    PCDIMMDevice *dimm = PC_DIMM(dev);

    if (!dimm->hostmem) {
        error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set");
        return;
    }
}

static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm)
{
    return host_memory_backend_get_memory(dimm->hostmem, &error_abort);
}

static void pc_dimm_class_init(ObjectClass *oc, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(oc);
    PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);

    dc->realize = pc_dimm_realize;
    dc->props = pc_dimm_properties;

    ddc->get_memory_region = pc_dimm_get_memory_region;
}

static TypeInfo pc_dimm_info = {
    .name          = TYPE_PC_DIMM,
    .parent        = TYPE_DEVICE,
    .instance_size = sizeof(PCDIMMDevice),
    .instance_init = pc_dimm_init,
    .class_init    = pc_dimm_class_init,
    .class_size    = sizeof(PCDIMMDeviceClass),
};

static void pc_dimm_register_types(void)
{
    type_register_static(&pc_dimm_info);
}

type_init(pc_dimm_register_types)