532 lines
16 KiB
C
532 lines
16 KiB
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 "qemu/osdep.h"
|
|
#include "sysemu/hostmem.h"
|
|
#include "hw/boards.h"
|
|
#include "qapi/error.h"
|
|
#include "qapi/qapi-builtin-visit.h"
|
|
#include "qapi/visitor.h"
|
|
#include "qemu/config-file.h"
|
|
#include "qom/object_interfaces.h"
|
|
#include "qemu/mmap-alloc.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
|
|
|
|
char *
|
|
host_memory_backend_get_name(HostMemoryBackend *backend)
|
|
{
|
|
if (!backend->use_canonical_path) {
|
|
return g_strdup(object_get_canonical_path_component(OBJECT(backend)));
|
|
}
|
|
|
|
return object_get_canonical_path(OBJECT(backend));
|
|
}
|
|
|
|
static void
|
|
host_memory_backend_get_size(Object *obj, Visitor *v, const char *name,
|
|
void *opaque, Error **errp)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
uint64_t value = backend->size;
|
|
|
|
visit_type_size(v, name, &value, errp);
|
|
}
|
|
|
|
static void
|
|
host_memory_backend_set_size(Object *obj, Visitor *v, const char *name,
|
|
void *opaque, Error **errp)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
uint64_t value;
|
|
|
|
if (host_memory_backend_mr_inited(backend)) {
|
|
error_setg(errp, "cannot change property %s of %s ", name,
|
|
object_get_typename(obj));
|
|
return;
|
|
}
|
|
|
|
if (!visit_type_size(v, name, &value, errp)) {
|
|
return;
|
|
}
|
|
if (!value) {
|
|
error_setg(errp,
|
|
"property '%s' of %s doesn't take value '%" PRIu64 "'",
|
|
name, object_get_typename(obj), value);
|
|
return;
|
|
}
|
|
backend->size = value;
|
|
}
|
|
|
|
static void
|
|
host_memory_backend_get_host_nodes(Object *obj, Visitor *v, const char *name,
|
|
void *opaque, Error **errp)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
uint16List *host_nodes = NULL;
|
|
uint16List **tail = &host_nodes;
|
|
unsigned long value;
|
|
|
|
value = find_first_bit(backend->host_nodes, MAX_NODES);
|
|
if (value == MAX_NODES) {
|
|
goto ret;
|
|
}
|
|
|
|
QAPI_LIST_APPEND(tail, value);
|
|
|
|
do {
|
|
value = find_next_bit(backend->host_nodes, MAX_NODES, value + 1);
|
|
if (value == MAX_NODES) {
|
|
break;
|
|
}
|
|
|
|
QAPI_LIST_APPEND(tail, value);
|
|
} while (true);
|
|
|
|
ret:
|
|
visit_type_uint16List(v, name, &host_nodes, errp);
|
|
qapi_free_uint16List(host_nodes);
|
|
}
|
|
|
|
static void
|
|
host_memory_backend_set_host_nodes(Object *obj, Visitor *v, const char *name,
|
|
void *opaque, Error **errp)
|
|
{
|
|
#ifdef CONFIG_NUMA
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
uint16List *l, *host_nodes = NULL;
|
|
|
|
visit_type_uint16List(v, name, &host_nodes, errp);
|
|
|
|
for (l = host_nodes; l; l = l->next) {
|
|
if (l->value >= MAX_NODES) {
|
|
error_setg(errp, "Invalid host-nodes value: %d", l->value);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
for (l = host_nodes; l; l = l->next) {
|
|
bitmap_set(backend->host_nodes, l->value, 1);
|
|
}
|
|
|
|
out:
|
|
qapi_free_uint16List(host_nodes);
|
|
#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 (!host_memory_backend_mr_inited(backend)) {
|
|
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 (!host_memory_backend_mr_inited(backend)) {
|
|
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;
|
|
}
|
|
|
|
static void host_memory_backend_set_prealloc(Object *obj, bool value,
|
|
Error **errp)
|
|
{
|
|
Error *local_err = NULL;
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
|
|
if (!host_memory_backend_mr_inited(backend)) {
|
|
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_threads, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
return;
|
|
}
|
|
backend->prealloc = true;
|
|
}
|
|
}
|
|
|
|
static void host_memory_backend_get_prealloc_threads(Object *obj, Visitor *v,
|
|
const char *name, void *opaque, Error **errp)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
visit_type_uint32(v, name, &backend->prealloc_threads, errp);
|
|
}
|
|
|
|
static void host_memory_backend_set_prealloc_threads(Object *obj, Visitor *v,
|
|
const char *name, void *opaque, Error **errp)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
uint32_t value;
|
|
|
|
if (!visit_type_uint32(v, name, &value, errp)) {
|
|
return;
|
|
}
|
|
if (value <= 0) {
|
|
error_setg(errp, "property '%s' of %s doesn't take value '%d'", name,
|
|
object_get_typename(obj), value);
|
|
return;
|
|
}
|
|
backend->prealloc_threads = value;
|
|
}
|
|
|
|
static void host_memory_backend_init(Object *obj)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
MachineState *machine = MACHINE(qdev_get_machine());
|
|
|
|
/* TODO: convert access to globals to compat properties */
|
|
backend->merge = machine_mem_merge(machine);
|
|
backend->dump = machine_dump_guest_core(machine);
|
|
backend->prealloc_threads = 1;
|
|
}
|
|
|
|
static void host_memory_backend_post_init(Object *obj)
|
|
{
|
|
object_apply_compat_props(obj);
|
|
}
|
|
|
|
bool host_memory_backend_mr_inited(HostMemoryBackend *backend)
|
|
{
|
|
/*
|
|
* NOTE: We forbid zero-length memory backend, so here zero means
|
|
* "we haven't inited the backend memory region yet".
|
|
*/
|
|
return memory_region_size(&backend->mr) != 0;
|
|
}
|
|
|
|
MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend)
|
|
{
|
|
return host_memory_backend_mr_inited(backend) ? &backend->mr : NULL;
|
|
}
|
|
|
|
void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped)
|
|
{
|
|
backend->is_mapped = mapped;
|
|
}
|
|
|
|
bool host_memory_backend_is_mapped(HostMemoryBackend *backend)
|
|
{
|
|
return backend->is_mapped;
|
|
}
|
|
|
|
#ifdef __linux__
|
|
size_t host_memory_backend_pagesize(HostMemoryBackend *memdev)
|
|
{
|
|
Object *obj = OBJECT(memdev);
|
|
char *path = object_property_get_str(obj, "mem-path", NULL);
|
|
size_t pagesize = qemu_mempath_getpagesize(path);
|
|
|
|
g_free(path);
|
|
return pagesize;
|
|
}
|
|
#else
|
|
size_t host_memory_backend_pagesize(HostMemoryBackend *memdev)
|
|
{
|
|
return qemu_real_host_page_size;
|
|
}
|
|
#endif
|
|
|
|
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) {
|
|
goto out;
|
|
}
|
|
|
|
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_str(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 (maxnode &&
|
|
mbind(ptr, sz, backend->policy, backend->host_nodes, maxnode + 1,
|
|
flags)) {
|
|
if (backend->policy != MPOL_DEFAULT || errno != ENOSYS) {
|
|
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,
|
|
backend->prealloc_threads, &local_err);
|
|
if (local_err) {
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
error_propagate(errp, local_err);
|
|
}
|
|
|
|
static bool
|
|
host_memory_backend_can_be_deleted(UserCreatable *uc)
|
|
{
|
|
if (host_memory_backend_is_mapped(MEMORY_BACKEND(uc))) {
|
|
return false;
|
|
} else {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
static bool host_memory_backend_get_share(Object *o, Error **errp)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(o);
|
|
|
|
return backend->share;
|
|
}
|
|
|
|
static void host_memory_backend_set_share(Object *o, bool value, Error **errp)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(o);
|
|
|
|
if (host_memory_backend_mr_inited(backend)) {
|
|
error_setg(errp, "cannot change property value");
|
|
return;
|
|
}
|
|
backend->share = value;
|
|
}
|
|
|
|
static bool
|
|
host_memory_backend_get_use_canonical_path(Object *obj, Error **errp)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
|
|
return backend->use_canonical_path;
|
|
}
|
|
|
|
static void
|
|
host_memory_backend_set_use_canonical_path(Object *obj, bool value,
|
|
Error **errp)
|
|
{
|
|
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
|
|
|
|
backend->use_canonical_path = value;
|
|
}
|
|
|
|
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;
|
|
|
|
object_class_property_add_bool(oc, "merge",
|
|
host_memory_backend_get_merge,
|
|
host_memory_backend_set_merge);
|
|
object_class_property_set_description(oc, "merge",
|
|
"Mark memory as mergeable");
|
|
object_class_property_add_bool(oc, "dump",
|
|
host_memory_backend_get_dump,
|
|
host_memory_backend_set_dump);
|
|
object_class_property_set_description(oc, "dump",
|
|
"Set to 'off' to exclude from core dump");
|
|
object_class_property_add_bool(oc, "prealloc",
|
|
host_memory_backend_get_prealloc,
|
|
host_memory_backend_set_prealloc);
|
|
object_class_property_set_description(oc, "prealloc",
|
|
"Preallocate memory");
|
|
object_class_property_add(oc, "prealloc-threads", "int",
|
|
host_memory_backend_get_prealloc_threads,
|
|
host_memory_backend_set_prealloc_threads,
|
|
NULL, NULL);
|
|
object_class_property_set_description(oc, "prealloc-threads",
|
|
"Number of CPU threads to use for prealloc");
|
|
object_class_property_add(oc, "size", "int",
|
|
host_memory_backend_get_size,
|
|
host_memory_backend_set_size,
|
|
NULL, NULL);
|
|
object_class_property_set_description(oc, "size",
|
|
"Size of the memory region (ex: 500M)");
|
|
object_class_property_add(oc, "host-nodes", "int",
|
|
host_memory_backend_get_host_nodes,
|
|
host_memory_backend_set_host_nodes,
|
|
NULL, NULL);
|
|
object_class_property_set_description(oc, "host-nodes",
|
|
"Binds memory to the list of NUMA host nodes");
|
|
object_class_property_add_enum(oc, "policy", "HostMemPolicy",
|
|
&HostMemPolicy_lookup,
|
|
host_memory_backend_get_policy,
|
|
host_memory_backend_set_policy);
|
|
object_class_property_set_description(oc, "policy",
|
|
"Set the NUMA policy");
|
|
object_class_property_add_bool(oc, "share",
|
|
host_memory_backend_get_share, host_memory_backend_set_share);
|
|
object_class_property_set_description(oc, "share",
|
|
"Mark the memory as private to QEMU or shared");
|
|
/*
|
|
* Do not delete/rename option. This option must be considered stable
|
|
* (as if it didn't have the 'x-' prefix including deprecation period) as
|
|
* long as 4.0 and older machine types exists.
|
|
* Option will be used by upper layers to override (disable) canonical path
|
|
* for ramblock-id set by compat properties on old machine types ( <= 4.0),
|
|
* to keep migration working when backend is used for main RAM with
|
|
* -machine memory-backend= option (main RAM historically used prefix-less
|
|
* ramblock-id).
|
|
*/
|
|
object_class_property_add_bool(oc, "x-use-canonical-path-for-ramblock-id",
|
|
host_memory_backend_get_use_canonical_path,
|
|
host_memory_backend_set_use_canonical_path);
|
|
}
|
|
|
|
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,
|
|
.instance_post_init = host_memory_backend_post_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ TYPE_USER_CREATABLE },
|
|
{ }
|
|
}
|
|
};
|
|
|
|
static void register_types(void)
|
|
{
|
|
type_register_static(&host_memory_backend_info);
|
|
}
|
|
|
|
type_init(register_types);
|