526 lines
16 KiB
C
526 lines
16 KiB
C
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/*
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* QEMU Host Memory Backend
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*
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* Copyright (C) 2013-2014 Red Hat Inc
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*
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* Authors:
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* Igor Mammedov <imammedo@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "sysemu/hostmem.h"
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#include "sysemu/sysemu.h"
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#include "hw/boards.h"
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#include "qapi/error.h"
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#include "qapi/qapi-builtin-visit.h"
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#include "qapi/visitor.h"
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#include "qemu/config-file.h"
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#include "qom/object_interfaces.h"
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#include "qemu/mmap-alloc.h"
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#ifdef CONFIG_NUMA
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#include <numaif.h>
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QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_DEFAULT != MPOL_DEFAULT);
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QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_PREFERRED != MPOL_PREFERRED);
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QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_BIND != MPOL_BIND);
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QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_INTERLEAVE != MPOL_INTERLEAVE);
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#endif
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char *
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host_memory_backend_get_name(HostMemoryBackend *backend)
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{
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if (!backend->use_canonical_path) {
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return g_strdup(object_get_canonical_path_component(OBJECT(backend)));
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}
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return object_get_canonical_path(OBJECT(backend));
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}
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static void
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host_memory_backend_get_size(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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uint64_t value = backend->size;
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visit_type_size(v, name, &value, errp);
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}
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static void
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host_memory_backend_set_size(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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uint64_t value;
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if (host_memory_backend_mr_inited(backend)) {
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error_setg(errp, "cannot change property %s of %s ", name,
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object_get_typename(obj));
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return;
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}
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if (!visit_type_size(v, name, &value, errp)) {
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return;
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}
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if (!value) {
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error_setg(errp,
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"property '%s' of %s doesn't take value '%" PRIu64 "'",
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name, object_get_typename(obj), value);
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return;
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}
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backend->size = value;
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}
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static void
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host_memory_backend_get_host_nodes(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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uint16List *host_nodes = NULL;
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uint16List **node = &host_nodes;
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unsigned long value;
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value = find_first_bit(backend->host_nodes, MAX_NODES);
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if (value == MAX_NODES) {
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goto ret;
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}
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*node = g_malloc0(sizeof(**node));
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(*node)->value = value;
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node = &(*node)->next;
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do {
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value = find_next_bit(backend->host_nodes, MAX_NODES, value + 1);
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if (value == MAX_NODES) {
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break;
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}
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*node = g_malloc0(sizeof(**node));
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(*node)->value = value;
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node = &(*node)->next;
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} while (true);
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ret:
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visit_type_uint16List(v, name, &host_nodes, errp);
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}
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static void
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host_memory_backend_set_host_nodes(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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#ifdef CONFIG_NUMA
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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uint16List *l, *host_nodes = NULL;
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visit_type_uint16List(v, name, &host_nodes, errp);
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for (l = host_nodes; l; l = l->next) {
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if (l->value >= MAX_NODES) {
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error_setg(errp, "Invalid host-nodes value: %d", l->value);
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goto out;
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}
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}
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for (l = host_nodes; l; l = l->next) {
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bitmap_set(backend->host_nodes, l->value, 1);
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}
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out:
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qapi_free_uint16List(host_nodes);
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#else
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error_setg(errp, "NUMA node binding are not supported by this QEMU");
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#endif
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}
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static int
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host_memory_backend_get_policy(Object *obj, Error **errp G_GNUC_UNUSED)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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return backend->policy;
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}
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static void
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host_memory_backend_set_policy(Object *obj, int policy, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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backend->policy = policy;
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#ifndef CONFIG_NUMA
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if (policy != HOST_MEM_POLICY_DEFAULT) {
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error_setg(errp, "NUMA policies are not supported by this QEMU");
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}
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#endif
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}
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static bool host_memory_backend_get_merge(Object *obj, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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return backend->merge;
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}
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static void host_memory_backend_set_merge(Object *obj, bool value, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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if (!host_memory_backend_mr_inited(backend)) {
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backend->merge = value;
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return;
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}
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if (value != backend->merge) {
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void *ptr = memory_region_get_ram_ptr(&backend->mr);
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uint64_t sz = memory_region_size(&backend->mr);
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qemu_madvise(ptr, sz,
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value ? QEMU_MADV_MERGEABLE : QEMU_MADV_UNMERGEABLE);
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backend->merge = value;
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}
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}
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static bool host_memory_backend_get_dump(Object *obj, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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return backend->dump;
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}
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static void host_memory_backend_set_dump(Object *obj, bool value, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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if (!host_memory_backend_mr_inited(backend)) {
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backend->dump = value;
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return;
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}
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if (value != backend->dump) {
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void *ptr = memory_region_get_ram_ptr(&backend->mr);
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uint64_t sz = memory_region_size(&backend->mr);
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qemu_madvise(ptr, sz,
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value ? QEMU_MADV_DODUMP : QEMU_MADV_DONTDUMP);
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backend->dump = value;
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}
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}
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static bool host_memory_backend_get_prealloc(Object *obj, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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return backend->prealloc;
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}
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static void host_memory_backend_set_prealloc(Object *obj, bool value,
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Error **errp)
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{
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Error *local_err = NULL;
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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if (!host_memory_backend_mr_inited(backend)) {
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backend->prealloc = value;
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return;
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}
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if (value && !backend->prealloc) {
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int fd = memory_region_get_fd(&backend->mr);
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void *ptr = memory_region_get_ram_ptr(&backend->mr);
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uint64_t sz = memory_region_size(&backend->mr);
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os_mem_prealloc(fd, ptr, sz, backend->prealloc_threads, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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backend->prealloc = true;
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}
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}
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static void host_memory_backend_get_prealloc_threads(Object *obj, Visitor *v,
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const char *name, void *opaque, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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visit_type_uint32(v, name, &backend->prealloc_threads, errp);
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}
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static void host_memory_backend_set_prealloc_threads(Object *obj, Visitor *v,
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const char *name, void *opaque, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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uint32_t value;
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if (!visit_type_uint32(v, name, &value, errp)) {
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return;
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}
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if (value <= 0) {
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error_setg(errp, "property '%s' of %s doesn't take value '%d'", name,
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object_get_typename(obj), value);
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return;
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}
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backend->prealloc_threads = value;
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}
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static void host_memory_backend_init(Object *obj)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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MachineState *machine = MACHINE(qdev_get_machine());
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/* TODO: convert access to globals to compat properties */
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backend->merge = machine_mem_merge(machine);
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backend->dump = machine_dump_guest_core(machine);
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backend->prealloc_threads = 1;
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}
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static void host_memory_backend_post_init(Object *obj)
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{
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object_apply_compat_props(obj);
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}
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bool host_memory_backend_mr_inited(HostMemoryBackend *backend)
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{
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/*
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* NOTE: We forbid zero-length memory backend, so here zero means
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* "we haven't inited the backend memory region yet".
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*/
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return memory_region_size(&backend->mr) != 0;
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}
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MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend)
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{
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return host_memory_backend_mr_inited(backend) ? &backend->mr : NULL;
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}
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void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped)
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{
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backend->is_mapped = mapped;
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}
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bool host_memory_backend_is_mapped(HostMemoryBackend *backend)
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{
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return backend->is_mapped;
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}
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#ifdef __linux__
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size_t host_memory_backend_pagesize(HostMemoryBackend *memdev)
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{
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Object *obj = OBJECT(memdev);
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char *path = object_property_get_str(obj, "mem-path", NULL);
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size_t pagesize = qemu_mempath_getpagesize(path);
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g_free(path);
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return pagesize;
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}
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#else
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size_t host_memory_backend_pagesize(HostMemoryBackend *memdev)
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{
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return qemu_real_host_page_size;
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}
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#endif
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static void
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host_memory_backend_memory_complete(UserCreatable *uc, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(uc);
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HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(uc);
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Error *local_err = NULL;
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void *ptr;
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uint64_t sz;
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if (bc->alloc) {
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bc->alloc(backend, &local_err);
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if (local_err) {
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goto out;
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}
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ptr = memory_region_get_ram_ptr(&backend->mr);
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sz = memory_region_size(&backend->mr);
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if (backend->merge) {
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qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE);
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}
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if (!backend->dump) {
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qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP);
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}
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#ifdef CONFIG_NUMA
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unsigned long lastbit = find_last_bit(backend->host_nodes, MAX_NODES);
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/* lastbit == MAX_NODES means maxnode = 0 */
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unsigned long maxnode = (lastbit + 1) % (MAX_NODES + 1);
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/* ensure policy won't be ignored in case memory is preallocated
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* before mbind(). note: MPOL_MF_STRICT is ignored on hugepages so
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* this doesn't catch hugepage case. */
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unsigned flags = MPOL_MF_STRICT | MPOL_MF_MOVE;
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/* check for invalid host-nodes and policies and give more verbose
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* error messages than mbind(). */
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if (maxnode && backend->policy == MPOL_DEFAULT) {
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error_setg(errp, "host-nodes must be empty for policy default,"
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" or you should explicitly specify a policy other"
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" than default");
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return;
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} else if (maxnode == 0 && backend->policy != MPOL_DEFAULT) {
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error_setg(errp, "host-nodes must be set for policy %s",
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HostMemPolicy_str(backend->policy));
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return;
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}
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/* We can have up to MAX_NODES nodes, but we need to pass maxnode+1
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* as argument to mbind() due to an old Linux bug (feature?) which
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* cuts off the last specified node. This means backend->host_nodes
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* must have MAX_NODES+1 bits available.
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*/
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assert(sizeof(backend->host_nodes) >=
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||
|
|
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");
|
||
|
|
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);
|