[qemu.git] / backends / hostmem.c

/*
 * QEMU Host Memory Backend
 *
 * Copyright (C) 2013-2014 Red Hat Inc
 *
 * Authors:
 *   Igor Mammedov <[email protected]>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */
#include "sysemu/hostmem.h"
#include "hw/boards.h"
#include "qapi/visitor.h"
#include "qapi-types.h"
#include "qapi-visit.h"
#include "qemu/config-file.h"
#include "qom/object_interfaces.h"

#ifdef CONFIG_NUMA
#include <numaif.h>
QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_DEFAULT != MPOL_DEFAULT);
QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_PREFERRED != MPOL_PREFERRED);
QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_BIND != MPOL_BIND);
QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_INTERLEAVE != MPOL_INTERLEAVE);
#endif

static void
host_memory_backend_get_size(Object *obj, Visitor *v, void *opaque,
                             const char *name, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
    uint64_t value = backend->size;

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

static void
host_memory_backend_set_size(Object *obj, Visitor *v, void *opaque,
                             const char *name, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
    Error *local_err = NULL;
    uint64_t value;

    if (memory_region_size(&backend->mr)) {
        error_setg(&local_err, "cannot change property value");
        goto out;
    }

    visit_type_size(v, &value, name, &local_err);
    if (local_err) {
        goto out;
    }
    if (!value) {
        error_setg(&local_err, "Property '%s.%s' doesn't take value '%"
                   PRIu64 "'", object_get_typename(obj), name, value);
        goto out;
    }
    backend->size = value;
out:
    error_propagate(errp, local_err);
}

static void
host_memory_backend_get_host_nodes(Object *obj, Visitor *v, void *opaque,
                                   const char *name, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
    uint16List *host_nodes = NULL;
    uint16List **node = &host_nodes;
    unsigned long value;

    value = find_first_bit(backend->host_nodes, MAX_NODES);
    if (value == MAX_NODES) {
        return;
    }

    *node = g_malloc0(sizeof(**node));
    (*node)->value = value;
    node = &(*node)->next;

    do {
        value = find_next_bit(backend->host_nodes, MAX_NODES, value + 1);
        if (value == MAX_NODES) {
            break;
        }

        *node = g_malloc0(sizeof(**node));
        (*node)->value = value;
        node = &(*node)->next;
    } while (true);

    visit_type_uint16List(v, &host_nodes, name, errp);
}

static void
host_memory_backend_set_host_nodes(Object *obj, Visitor *v, void *opaque,
                                   const char *name, Error **errp)
{
#ifdef CONFIG_NUMA
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
    uint16List *l = NULL;

    visit_type_uint16List(v, &l, name, errp);

    while (l) {
        bitmap_set(backend->host_nodes, l->value, 1);
        l = l->next;
    }
#else
    error_setg(errp, "NUMA node binding are not supported by this QEMU");
#endif
}

static int
host_memory_backend_get_policy(Object *obj, Error **errp G_GNUC_UNUSED)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
    return backend->policy;
}

static void
host_memory_backend_set_policy(Object *obj, int policy, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
    backend->policy = policy;

#ifndef CONFIG_NUMA
    if (policy != HOST_MEM_POLICY_DEFAULT) {
        error_setg(errp, "NUMA policies are not supported by this QEMU");
    }
#endif
}

static bool host_memory_backend_get_merge(Object *obj, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);

    return backend->merge;
}

static void host_memory_backend_set_merge(Object *obj, bool value, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);

    if (!memory_region_size(&backend->mr)) {
        backend->merge = value;
        return;
    }

    if (value != backend->merge) {
        void *ptr = memory_region_get_ram_ptr(&backend->mr);
        uint64_t sz = memory_region_size(&backend->mr);

        qemu_madvise(ptr, sz,
                     value ? QEMU_MADV_MERGEABLE : QEMU_MADV_UNMERGEABLE);
        backend->merge = value;
    }
}

static bool host_memory_backend_get_dump(Object *obj, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);

    return backend->dump;
}

static void host_memory_backend_set_dump(Object *obj, bool value, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);

    if (!memory_region_size(&backend->mr)) {
        backend->dump = value;
        return;
    }

    if (value != backend->dump) {
        void *ptr = memory_region_get_ram_ptr(&backend->mr);
        uint64_t sz = memory_region_size(&backend->mr);

        qemu_madvise(ptr, sz,
                     value ? QEMU_MADV_DODUMP : QEMU_MADV_DONTDUMP);
        backend->dump = value;
    }
}

static bool host_memory_backend_get_prealloc(Object *obj, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);

    return backend->prealloc || backend->force_prealloc;
}

static void host_memory_backend_set_prealloc(Object *obj, bool value,
                                             Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);

    if (backend->force_prealloc) {
        if (value) {
            error_setg(errp,
                       "remove -mem-prealloc to use the prealloc property");
            return;
        }
    }

    if (!memory_region_size(&backend->mr)) {
        backend->prealloc = value;
        return;
    }

    if (value && !backend->prealloc) {
        int fd = memory_region_get_fd(&backend->mr);
        void *ptr = memory_region_get_ram_ptr(&backend->mr);
        uint64_t sz = memory_region_size(&backend->mr);

        os_mem_prealloc(fd, ptr, sz);
        backend->prealloc = true;
    }
}

static void host_memory_backend_init(Object *obj)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
    MachineState *machine = MACHINE(qdev_get_machine());

    backend->merge = machine_mem_merge(machine);
    backend->dump = machine_dump_guest_core(machine);
    backend->prealloc = mem_prealloc;

    object_property_add_bool(obj, "merge",
                        host_memory_backend_get_merge,
                        host_memory_backend_set_merge, NULL);
    object_property_add_bool(obj, "dump",
                        host_memory_backend_get_dump,
                        host_memory_backend_set_dump, NULL);
    object_property_add_bool(obj, "prealloc",
                        host_memory_backend_get_prealloc,
                        host_memory_backend_set_prealloc, NULL);
    object_property_add(obj, "size", "int",
                        host_memory_backend_get_size,
                        host_memory_backend_set_size, NULL, NULL, NULL);
    object_property_add(obj, "host-nodes", "int",
                        host_memory_backend_get_host_nodes,
                        host_memory_backend_set_host_nodes, NULL, NULL, NULL);
    object_property_add_enum(obj, "policy", "HostMemPolicy",
                             HostMemPolicy_lookup,
                             host_memory_backend_get_policy,
                             host_memory_backend_set_policy, NULL);
}

MemoryRegion *
host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp)
{
    return memory_region_size(&backend->mr) ? &backend->mr : NULL;
}

static void
host_memory_backend_memory_complete(UserCreatable *uc, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(uc);
    HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(uc);
    Error *local_err = NULL;
    void *ptr;
    uint64_t sz;

    if (bc->alloc) {
        bc->alloc(backend, &local_err);
        if (local_err) {
            error_propagate(errp, local_err);
            return;
        }

        ptr = memory_region_get_ram_ptr(&backend->mr);
        sz = memory_region_size(&backend->mr);

        if (backend->merge) {
            qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE);
        }
        if (!backend->dump) {
            qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP);
        }
#ifdef CONFIG_NUMA
        unsigned long lastbit = find_last_bit(backend->host_nodes, MAX_NODES);
        /* lastbit == MAX_NODES means maxnode = 0 */
        unsigned long maxnode = (lastbit + 1) % (MAX_NODES + 1);
        /* ensure policy won't be ignored in case memory is preallocated
         * before mbind(). note: MPOL_MF_STRICT is ignored on hugepages so
         * this doesn't catch hugepage case. */
        unsigned flags = MPOL_MF_STRICT | MPOL_MF_MOVE;

        /* check for invalid host-nodes and policies and give more verbose
         * error messages than mbind(). */
        if (maxnode && backend->policy == MPOL_DEFAULT) {
            error_setg(errp, "host-nodes must be empty for policy default,"
                       " or you should explicitly specify a policy other"
                       " than default");
            return;
        } else if (maxnode == 0 && backend->policy != MPOL_DEFAULT) {
            error_setg(errp, "host-nodes must be set for policy %s",
                       HostMemPolicy_lookup[backend->policy]);
            return;
        }

        /* We can have up to MAX_NODES nodes, but we need to pass maxnode+1
         * as argument to mbind() due to an old Linux bug (feature?) which
         * cuts off the last specified node. This means backend->host_nodes
         * must have MAX_NODES+1 bits available.
         */
        assert(sizeof(backend->host_nodes) >=
               BITS_TO_LONGS(MAX_NODES + 1) * sizeof(unsigned long));
        assert(maxnode <= MAX_NODES);
        if (mbind(ptr, sz, backend->policy,
                  maxnode ? backend->host_nodes : NULL, maxnode + 1, flags)) {
            error_setg_errno(errp, errno,
                             "cannot bind memory to host NUMA nodes");
            return;
        }
#endif
        /* Preallocate memory after the NUMA policy has been instantiated.
         * This is necessary to guarantee memory is allocated with
         * specified NUMA policy in place.
         */
        if (backend->prealloc) {
            os_mem_prealloc(memory_region_get_fd(&backend->mr), ptr, sz);
        }
    }
}

static bool
host_memory_backend_can_be_deleted(UserCreatable *uc, Error **errp)
{
    MemoryRegion *mr;

    mr = host_memory_backend_get_memory(MEMORY_BACKEND(uc), errp);
    if (memory_region_is_mapped(mr)) {
        return false;
    } else {
        return true;
    }
}

static void
host_memory_backend_class_init(ObjectClass *oc, void *data)
{
    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);

    ucc->complete = host_memory_backend_memory_complete;
    ucc->can_be_deleted = host_memory_backend_can_be_deleted;
}

static const TypeInfo host_memory_backend_info = {
    .name = TYPE_MEMORY_BACKEND,
    .parent = TYPE_OBJECT,
    .abstract = true,
    .class_size = sizeof(HostMemoryBackendClass),
    .class_init = host_memory_backend_class_init,
    .instance_size = sizeof(HostMemoryBackend),
    .instance_init = host_memory_backend_init,
    .interfaces = (InterfaceInfo[]) {
        { TYPE_USER_CREATABLE },
        { }
    }
};

static void register_types(void)
{
    type_register_static(&host_memory_backend_info);
}

type_init(register_types);
Commit	Line	Data
1f070489 IM	1	/*
	2	* QEMU Host Memory Backend
	3	*
	4	* Copyright (C) 2013-2014 Red Hat Inc
	5	*
	6	* Authors:
	7	* Igor Mammedov <[email protected]>
	8	*
	9	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	10	* See the COPYING file in the top-level directory.
	11	*/
	12	#include "sysemu/hostmem.h"
6b269967	13	#include "hw/boards.h"
1f070489	14	#include "qapi/visitor.h"
4cf1b76b HT	15	#include "qapi-types.h"
4cf1b76b HT	16	#include "qapi-visit.h"
1f070489 IM	17	#include "qemu/config-file.h"
	18	#include "qom/object_interfaces.h"
	19
4cf1b76b HT	20	#ifdef CONFIG_NUMA
	21	#include <numaif.h>
	22	QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_DEFAULT != MPOL_DEFAULT);
	23	QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_PREFERRED != MPOL_PREFERRED);
	24	QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_BIND != MPOL_BIND);
	25	QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_INTERLEAVE != MPOL_INTERLEAVE);
	26	#endif
	27
1f070489	28	static void
58f4662c HT	29	host_memory_backend_get_size(Object obj, Visitor v, void *opaque,
58f4662c HT	30	const char name, Error *errp)
1f070489 IM	31	{
	32	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	33	uint64_t value = backend->size;
	34
	35	visit_type_size(v, &value, name, errp);
	36	}
	37
	38	static void
58f4662c HT	39	host_memory_backend_set_size(Object obj, Visitor v, void *opaque,
58f4662c HT	40	const char name, Error *errp)
1f070489 IM	41	{
	42	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	43	Error *local_err = NULL;
	44	uint64_t value;
	45
	46	if (memory_region_size(&backend->mr)) {
	47	error_setg(&local_err, "cannot change property value");
	48	goto out;
	49	}
	50
	51	visit_type_size(v, &value, name, &local_err);
	52	if (local_err) {
	53	goto out;
	54	}
	55	if (!value) {
	56	error_setg(&local_err, "Property '%s.%s' doesn't take value '%"
	57	PRIu64 "'", object_get_typename(obj), name, value);
	58	goto out;
	59	}
	60	backend->size = value;
	61	out:
	62	error_propagate(errp, local_err);
	63	}
	64
4cf1b76b HT	65	static void
	66	host_memory_backend_get_host_nodes(Object obj, Visitor v, void *opaque,
	67	const char name, Error *errp)
	68	{
	69	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	70	uint16List *host_nodes = NULL;
	71	uint16List **node = &host_nodes;
	72	unsigned long value;
	73
	74	value = find_first_bit(backend->host_nodes, MAX_NODES);
	75	if (value == MAX_NODES) {
	76	return;
	77	}
	78
	79	node = g_malloc0(sizeof(*node));
	80	(*node)->value = value;
	81	node = &(*node)->next;
	82
	83	do {
	84	value = find_next_bit(backend->host_nodes, MAX_NODES, value + 1);
	85	if (value == MAX_NODES) {
	86	break;
	87	}
	88
	89	node = g_malloc0(sizeof(*node));
	90	(*node)->value = value;
	91	node = &(*node)->next;
	92	} while (true);
	93
	94	visit_type_uint16List(v, &host_nodes, name, errp);
	95	}
	96
	97	static void
	98	host_memory_backend_set_host_nodes(Object obj, Visitor v, void *opaque,
	99	const char name, Error *errp)
	100	{
	101	#ifdef CONFIG_NUMA
	102	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	103	uint16List *l = NULL;
	104
	105	visit_type_uint16List(v, &l, name, errp);
	106
	107	while (l) {
	108	bitmap_set(backend->host_nodes, l->value, 1);
	109	l = l->next;
	110	}
	111	#else
	112	error_setg(errp, "NUMA node binding are not supported by this QEMU");
	113	#endif
	114	}
	115
a3590dac DB	116	static int
a3590dac DB	117	host_memory_backend_get_policy(Object obj, Error *errp G_GNUC_UNUSED)
4cf1b76b HT	118	{
4cf1b76b HT	119	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
a3590dac	120	return backend->policy;
4cf1b76b HT	121	}
	122
	123	static void
a3590dac	124	host_memory_backend_set_policy(Object obj, int policy, Error *errp)
4cf1b76b HT	125	{
4cf1b76b HT	126	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
4cf1b76b HT	127	backend->policy = policy;
	128
	129	#ifndef CONFIG_NUMA
	130	if (policy != HOST_MEM_POLICY_DEFAULT) {
	131	error_setg(errp, "NUMA policies are not supported by this QEMU");
	132	}
	133	#endif
	134	}
	135
605d0a94 PB	136	static bool host_memory_backend_get_merge(Object obj, Error *errp)
	137	{
	138	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	139
	140	return backend->merge;
	141	}
	142
	143	static void host_memory_backend_set_merge(Object obj, bool value, Error *errp)
	144	{
	145	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	146
	147	if (!memory_region_size(&backend->mr)) {
	148	backend->merge = value;
	149	return;
	150	}
	151
	152	if (value != backend->merge) {
	153	void *ptr = memory_region_get_ram_ptr(&backend->mr);
	154	uint64_t sz = memory_region_size(&backend->mr);
	155
	156	qemu_madvise(ptr, sz,
	157	value ? QEMU_MADV_MERGEABLE : QEMU_MADV_UNMERGEABLE);
	158	backend->merge = value;
	159	}
	160	}
	161
	162	static bool host_memory_backend_get_dump(Object obj, Error *errp)
	163	{
	164	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	165
	166	return backend->dump;
	167	}
	168
	169	static void host_memory_backend_set_dump(Object obj, bool value, Error *errp)
	170	{
	171	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	172
	173	if (!memory_region_size(&backend->mr)) {
	174	backend->dump = value;
	175	return;
	176	}
	177
	178	if (value != backend->dump) {
	179	void *ptr = memory_region_get_ram_ptr(&backend->mr);
	180	uint64_t sz = memory_region_size(&backend->mr);
	181
	182	qemu_madvise(ptr, sz,
	183	value ? QEMU_MADV_DODUMP : QEMU_MADV_DONTDUMP);
	184	backend->dump = value;
	185	}
	186	}
	187
a35ba7be PB	188	static bool host_memory_backend_get_prealloc(Object obj, Error *errp)
	189	{
	190	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	191
	192	return backend->prealloc \|\| backend->force_prealloc;
	193	}
	194
	195	static void host_memory_backend_set_prealloc(Object *obj, bool value,
	196	Error **errp)
	197	{
	198	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	199
	200	if (backend->force_prealloc) {
	201	if (value) {
	202	error_setg(errp,
	203	"remove -mem-prealloc to use the prealloc property");
	204	return;
	205	}
	206	}
	207
	208	if (!memory_region_size(&backend->mr)) {
	209	backend->prealloc = value;
	210	return;
	211	}
	212
	213	if (value && !backend->prealloc) {
	214	int fd = memory_region_get_fd(&backend->mr);
	215	void *ptr = memory_region_get_ram_ptr(&backend->mr);
	216	uint64_t sz = memory_region_size(&backend->mr);
	217
	218	os_mem_prealloc(fd, ptr, sz);
	219	backend->prealloc = true;
	220	}
	221	}
	222
58f4662c	223	static void host_memory_backend_init(Object *obj)
1f070489	224	{
605d0a94	225	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
6b269967	226	MachineState *machine = MACHINE(qdev_get_machine());
605d0a94	227
6b269967 EH	228	backend->merge = machine_mem_merge(machine);
6b269967 EH	229	backend->dump = machine_dump_guest_core(machine);
a35ba7be	230	backend->prealloc = mem_prealloc;
605d0a94 PB	231
	232	object_property_add_bool(obj, "merge",
	233	host_memory_backend_get_merge,
	234	host_memory_backend_set_merge, NULL);
	235	object_property_add_bool(obj, "dump",
	236	host_memory_backend_get_dump,
	237	host_memory_backend_set_dump, NULL);
a35ba7be PB	238	object_property_add_bool(obj, "prealloc",
	239	host_memory_backend_get_prealloc,
	240	host_memory_backend_set_prealloc, NULL);
1f070489	241	object_property_add(obj, "size", "int",
58f4662c HT	242	host_memory_backend_get_size,
58f4662c HT	243	host_memory_backend_set_size, NULL, NULL, NULL);
4cf1b76b HT	244	object_property_add(obj, "host-nodes", "int",
	245	host_memory_backend_get_host_nodes,
	246	host_memory_backend_set_host_nodes, NULL, NULL, NULL);
a3590dac DB	247	object_property_add_enum(obj, "policy", "HostMemPolicy",
	248	HostMemPolicy_lookup,
	249	host_memory_backend_get_policy,
	250	host_memory_backend_set_policy, NULL);
1f070489 IM	251	}
1f070489 IM	252
1f070489 IM	253	MemoryRegion *
	254	host_memory_backend_get_memory(HostMemoryBackend backend, Error *errp)
	255	{
	256	return memory_region_size(&backend->mr) ? &backend->mr : NULL;
	257	}
	258
bd9262d9 HT	259	static void
	260	host_memory_backend_memory_complete(UserCreatable uc, Error *errp)
	261	{
	262	HostMemoryBackend *backend = MEMORY_BACKEND(uc);
	263	HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(uc);
605d0a94 PB	264	Error *local_err = NULL;
	265	void *ptr;
	266	uint64_t sz;
bd9262d9 HT	267
bd9262d9 HT	268	if (bc->alloc) {
605d0a94 PB	269	bc->alloc(backend, &local_err);
	270	if (local_err) {
	271	error_propagate(errp, local_err);
	272	return;
	273	}
	274
	275	ptr = memory_region_get_ram_ptr(&backend->mr);
	276	sz = memory_region_size(&backend->mr);
	277
	278	if (backend->merge) {
	279	qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE);
	280	}
	281	if (!backend->dump) {
	282	qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP);
	283	}
4cf1b76b HT	284	#ifdef CONFIG_NUMA
	285	unsigned long lastbit = find_last_bit(backend->host_nodes, MAX_NODES);
	286	/* lastbit == MAX_NODES means maxnode = 0 */
	287	unsigned long maxnode = (lastbit + 1) % (MAX_NODES + 1);
	288	/* ensure policy won't be ignored in case memory is preallocated
	289	* before mbind(). note: MPOL_MF_STRICT is ignored on hugepages so
	290	* this doesn't catch hugepage case. */
288d3322	291	unsigned flags = MPOL_MF_STRICT \| MPOL_MF_MOVE;
4cf1b76b HT	292
	293	/* check for invalid host-nodes and policies and give more verbose
	294	* error messages than mbind(). */
	295	if (maxnode && backend->policy == MPOL_DEFAULT) {
	296	error_setg(errp, "host-nodes must be empty for policy default,"
	297	" or you should explicitly specify a policy other"
	298	" than default");
	299	return;
	300	} else if (maxnode == 0 && backend->policy != MPOL_DEFAULT) {
	301	error_setg(errp, "host-nodes must be set for policy %s",
	302	HostMemPolicy_lookup[backend->policy]);
	303	return;
	304	}
	305
	306	/* We can have up to MAX_NODES nodes, but we need to pass maxnode+1
	307	* as argument to mbind() due to an old Linux bug (feature?) which
	308	* cuts off the last specified node. This means backend->host_nodes
	309	* must have MAX_NODES+1 bits available.
	310	*/
	311	assert(sizeof(backend->host_nodes) >=
	312	BITS_TO_LONGS(MAX_NODES + 1) * sizeof(unsigned long));
	313	assert(maxnode <= MAX_NODES);
	314	if (mbind(ptr, sz, backend->policy,
	315	maxnode ? backend->host_nodes : NULL, maxnode + 1, flags)) {
	316	error_setg_errno(errp, errno,
	317	"cannot bind memory to host NUMA nodes");
	318	return;
	319	}
	320	#endif
	321	/* Preallocate memory after the NUMA policy has been instantiated.
	322	* This is necessary to guarantee memory is allocated with
	323	* specified NUMA policy in place.
	324	*/
a35ba7be PB	325	if (backend->prealloc) {
	326	os_mem_prealloc(memory_region_get_fd(&backend->mr), ptr, sz);
	327	}
bd9262d9 HT	328	}
	329	}
	330
36bce5ca LM	331	static bool
	332	host_memory_backend_can_be_deleted(UserCreatable uc, Error *errp)
	333	{
	334	MemoryRegion *mr;
	335
	336	mr = host_memory_backend_get_memory(MEMORY_BACKEND(uc), errp);
	337	if (memory_region_is_mapped(mr)) {
	338	return false;
	339	} else {
	340	return true;
	341	}
	342	}
	343
bd9262d9 HT	344	static void
	345	host_memory_backend_class_init(ObjectClass oc, void data)
	346	{
	347	UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
	348
	349	ucc->complete = host_memory_backend_memory_complete;
36bce5ca	350	ucc->can_be_deleted = host_memory_backend_can_be_deleted;
bd9262d9 HT	351	}
bd9262d9 HT	352
58f4662c	353	static const TypeInfo host_memory_backend_info = {
1f070489 IM	354	.name = TYPE_MEMORY_BACKEND,
	355	.parent = TYPE_OBJECT,
	356	.abstract = true,
	357	.class_size = sizeof(HostMemoryBackendClass),
bd9262d9	358	.class_init = host_memory_backend_class_init,
1f070489	359	.instance_size = sizeof(HostMemoryBackend),
58f4662c	360	.instance_init = host_memory_backend_init,
1f070489 IM	361	.interfaces = (InterfaceInfo[]) {
	362	{ TYPE_USER_CREATABLE },
	363	{ }
	364	}
	365	};
	366
	367	static void register_types(void)
	368	{
58f4662c	369	type_register_static(&host_memory_backend_info);
1f070489 IM	370	}
	371
	372	type_init(register_types);