[mirror_qemu.git] / backends / hostmem.c

/*
 * QEMU Host Memory Backend
 *
 * Copyright (C) 2013-2014 Red Hat Inc
 *
 * Authors:
 *   Igor Mammedov <imammedo@redhat.com>
 *
 * 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 "qapi/visitor.h"
#include "qapi-types.h"
#include "qapi-visit.h"
#include "qapi/qmp/qerror.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 void
host_memory_backend_get_policy(Object *obj, Visitor *v, void *opaque,
                               const char *name, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
    int policy = backend->policy;

    visit_type_enum(v, &policy, HostMemPolicy_lookup, NULL, name, errp);
}

static void
host_memory_backend_set_policy(Object *obj, Visitor *v, void *opaque,
                               const char *name, Error **errp)
{
    HostMemoryBackend *backend = MEMORY_BACKEND(obj);
    int policy;

    visit_type_enum(v, &policy, HostMemPolicy_lookup, NULL, name, errp);
    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);

    backend->merge = qemu_opt_get_bool(qemu_get_machine_opts(),
                                       "mem-merge", true);
    backend->dump = qemu_opt_get_bool(qemu_get_machine_opts(),
                                      "dump-guest-core", true);
    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(obj, "policy", "str",
                        host_memory_backend_get_policy,
                        host_memory_backend_set_policy, NULL, NULL, 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 void
host_memory_backend_class_init(ObjectClass *oc, void *data)
{
    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);

    ucc->complete = host_memory_backend_memory_complete;
}

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 <imammedo@redhat.com>
	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"
1f070489	13	#include "qapi/visitor.h"
4cf1b76b HT	14	#include "qapi-types.h"
4cf1b76b HT	15	#include "qapi-visit.h"
1f070489 IM	16	#include "qapi/qmp/qerror.h"
	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
	116	static void
	117	host_memory_backend_get_policy(Object obj, Visitor v, void *opaque,
	118	const char name, Error *errp)
	119	{
	120	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	121	int policy = backend->policy;
	122
	123	visit_type_enum(v, &policy, HostMemPolicy_lookup, NULL, name, errp);
	124	}
	125
	126	static void
	127	host_memory_backend_set_policy(Object obj, Visitor v, void *opaque,
	128	const char name, Error *errp)
129	{
130	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
131	int policy;
132
133	visit_type_enum(v, &policy, HostMemPolicy_lookup, NULL, name, errp);
134	backend->policy = policy;
135
136	#ifndef CONFIG_NUMA
137	if (policy != HOST_MEM_POLICY_DEFAULT) {
138	error_setg(errp, "NUMA policies are not supported by this QEMU");
139	}
140	#endif
141	}
142
605d0a94 PB	143	static bool host_memory_backend_get_merge(Object obj, Error *errp)
	144	{
	145	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	146
	147	return backend->merge;
	148	}
	149
	150	static void host_memory_backend_set_merge(Object obj, bool value, Error *errp)
	151	{
	152	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	153
	154	if (!memory_region_size(&backend->mr)) {
	155	backend->merge = value;
	156	return;
	157	}
	158
	159	if (value != backend->merge) {
	160	void *ptr = memory_region_get_ram_ptr(&backend->mr);
	161	uint64_t sz = memory_region_size(&backend->mr);
	162
	163	qemu_madvise(ptr, sz,
	164	value ? QEMU_MADV_MERGEABLE : QEMU_MADV_UNMERGEABLE);
	165	backend->merge = value;
	166	}
	167	}
	168
	169	static bool host_memory_backend_get_dump(Object obj, Error *errp)
	170	{
	171	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	172
	173	return backend->dump;
	174	}
	175
	176	static void host_memory_backend_set_dump(Object obj, bool value, Error *errp)
	177	{
	178	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	179
	180	if (!memory_region_size(&backend->mr)) {
	181	backend->dump = value;
	182	return;
	183	}
	184
	185	if (value != backend->dump) {
	186	void *ptr = memory_region_get_ram_ptr(&backend->mr);
	187	uint64_t sz = memory_region_size(&backend->mr);
	188
	189	qemu_madvise(ptr, sz,
	190	value ? QEMU_MADV_DODUMP : QEMU_MADV_DONTDUMP);
	191	backend->dump = value;
	192	}
	193	}
	194
a35ba7be PB	195	static bool host_memory_backend_get_prealloc(Object obj, Error *errp)
	196	{
	197	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	198
	199	return backend->prealloc \|\| backend->force_prealloc;
	200	}
	201
	202	static void host_memory_backend_set_prealloc(Object *obj, bool value,
	203	Error **errp)
	204	{
	205	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	206
	207	if (backend->force_prealloc) {
	208	if (value) {
	209	error_setg(errp,
	210	"remove -mem-prealloc to use the prealloc property");
	211	return;
	212	}
	213	}
	214
	215	if (!memory_region_size(&backend->mr)) {
	216	backend->prealloc = value;
	217	return;
	218	}
	219
	220	if (value && !backend->prealloc) {
	221	int fd = memory_region_get_fd(&backend->mr);
	222	void *ptr = memory_region_get_ram_ptr(&backend->mr);
	223	uint64_t sz = memory_region_size(&backend->mr);
	224
	225	os_mem_prealloc(fd, ptr, sz);
	226	backend->prealloc = true;
	227	}
	228	}
	229
58f4662c	230	static void host_memory_backend_init(Object *obj)
1f070489	231	{
605d0a94 PB	232	HostMemoryBackend *backend = MEMORY_BACKEND(obj);
	233
	234	backend->merge = qemu_opt_get_bool(qemu_get_machine_opts(),
	235	"mem-merge", true);
	236	backend->dump = qemu_opt_get_bool(qemu_get_machine_opts(),
	237	"dump-guest-core", true);
a35ba7be	238	backend->prealloc = mem_prealloc;
605d0a94 PB	239
	240	object_property_add_bool(obj, "merge",
	241	host_memory_backend_get_merge,
	242	host_memory_backend_set_merge, NULL);
	243	object_property_add_bool(obj, "dump",
	244	host_memory_backend_get_dump,
	245	host_memory_backend_set_dump, NULL);
a35ba7be PB	246	object_property_add_bool(obj, "prealloc",
	247	host_memory_backend_get_prealloc,
	248	host_memory_backend_set_prealloc, NULL);
1f070489	249	object_property_add(obj, "size", "int",
58f4662c HT	250	host_memory_backend_get_size,
58f4662c HT	251	host_memory_backend_set_size, NULL, NULL, NULL);
4cf1b76b HT	252	object_property_add(obj, "host-nodes", "int",
	253	host_memory_backend_get_host_nodes,
	254	host_memory_backend_set_host_nodes, NULL, NULL, NULL);
	255	object_property_add(obj, "policy", "str",
	256	host_memory_backend_get_policy,
	257	host_memory_backend_set_policy, NULL, NULL, NULL);
1f070489 IM	258	}
1f070489 IM	259
1f070489 IM	260	MemoryRegion *
	261	host_memory_backend_get_memory(HostMemoryBackend backend, Error *errp)
	262	{
	263	return memory_region_size(&backend->mr) ? &backend->mr : NULL;
	264	}
	265
bd9262d9 HT	266	static void
	267	host_memory_backend_memory_complete(UserCreatable uc, Error *errp)
	268	{
	269	HostMemoryBackend *backend = MEMORY_BACKEND(uc);
	270	HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(uc);
605d0a94 PB	271	Error *local_err = NULL;
	272	void *ptr;
	273	uint64_t sz;
bd9262d9 HT	274
bd9262d9 HT	275	if (bc->alloc) {
605d0a94 PB	276	bc->alloc(backend, &local_err);
	277	if (local_err) {
	278	error_propagate(errp, local_err);
	279	return;
	280	}
	281
	282	ptr = memory_region_get_ram_ptr(&backend->mr);
	283	sz = memory_region_size(&backend->mr);
	284
	285	if (backend->merge) {
	286	qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE);
	287	}
	288	if (!backend->dump) {
	289	qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP);
	290	}
4cf1b76b HT	291	#ifdef CONFIG_NUMA
	292	unsigned long lastbit = find_last_bit(backend->host_nodes, MAX_NODES);
	293	/* lastbit == MAX_NODES means maxnode = 0 */
	294	unsigned long maxnode = (lastbit + 1) % (MAX_NODES + 1);
	295	/* ensure policy won't be ignored in case memory is preallocated
	296	* before mbind(). note: MPOL_MF_STRICT is ignored on hugepages so
	297	* this doesn't catch hugepage case. */
288d3322	298	unsigned flags = MPOL_MF_STRICT \| MPOL_MF_MOVE;
4cf1b76b HT	299
	300	/* check for invalid host-nodes and policies and give more verbose
	301	* error messages than mbind(). */
	302	if (maxnode && backend->policy == MPOL_DEFAULT) {
	303	error_setg(errp, "host-nodes must be empty for policy default,"
	304	" or you should explicitly specify a policy other"
	305	" than default");
	306	return;
	307	} else if (maxnode == 0 && backend->policy != MPOL_DEFAULT) {
	308	error_setg(errp, "host-nodes must be set for policy %s",
	309	HostMemPolicy_lookup[backend->policy]);
	310	return;
	311	}
	312
	313	/* We can have up to MAX_NODES nodes, but we need to pass maxnode+1
	314	* as argument to mbind() due to an old Linux bug (feature?) which
	315	* cuts off the last specified node. This means backend->host_nodes
	316	* must have MAX_NODES+1 bits available.
	317	*/
	318	assert(sizeof(backend->host_nodes) >=
	319	BITS_TO_LONGS(MAX_NODES + 1) * sizeof(unsigned long));
	320	assert(maxnode <= MAX_NODES);
	321	if (mbind(ptr, sz, backend->policy,
	322	maxnode ? backend->host_nodes : NULL, maxnode + 1, flags)) {
	323	error_setg_errno(errp, errno,
	324	"cannot bind memory to host NUMA nodes");
	325	return;
	326	}
	327	#endif
	328	/* Preallocate memory after the NUMA policy has been instantiated.
	329	* This is necessary to guarantee memory is allocated with
	330	* specified NUMA policy in place.
	331	*/
a35ba7be PB	332	if (backend->prealloc) {
	333	os_mem_prealloc(memory_region_get_fd(&backend->mr), ptr, sz);
	334	}
bd9262d9 HT	335	}
	336	}
	337
	338	static void
	339	host_memory_backend_class_init(ObjectClass oc, void data)
	340	{
	341	UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
	342
	343	ucc->complete = host_memory_backend_memory_complete;
	344	}
	345
58f4662c	346	static const TypeInfo host_memory_backend_info = {
1f070489 IM	347	.name = TYPE_MEMORY_BACKEND,
	348	.parent = TYPE_OBJECT,
	349	.abstract = true,
	350	.class_size = sizeof(HostMemoryBackendClass),
bd9262d9	351	.class_init = host_memory_backend_class_init,
1f070489	352	.instance_size = sizeof(HostMemoryBackend),
58f4662c	353	.instance_init = host_memory_backend_init,
1f070489 IM	354	.interfaces = (InterfaceInfo[]) {
	355	{ TYPE_USER_CREATABLE },
	356	{ }
	357	}
	358	};
	359
	360	static void register_types(void)
	361	{
58f4662c	362	type_register_static(&host_memory_backend_info);
1f070489 IM	363	}
	364
	365	type_init(register_types);