431 lines
12 KiB
C
431 lines
12 KiB
C
/*
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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 "hw/boards.h"
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#include "qapi/error.h"
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#include "qapi/visitor.h"
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#include "qapi-types.h"
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#include "qapi-visit.h"
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#include "qemu/config-file.h"
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#include "qom/object_interfaces.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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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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Error *local_err = NULL;
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uint64_t value;
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if (host_memory_backend_mr_inited(backend)) {
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error_setg(&local_err, "cannot change property value");
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goto out;
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}
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visit_type_size(v, name, &value, &local_err);
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if (local_err) {
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goto out;
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}
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if (!value) {
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error_setg(&local_err, "Property '%s.%s' doesn't take value '%"
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PRIu64 "'", object_get_typename(obj), name, value);
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goto out;
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}
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backend->size = value;
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out:
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error_propagate(errp, local_err);
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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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return;
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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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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 = NULL;
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visit_type_uint16List(v, name, &l, errp);
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while (l) {
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bitmap_set(backend->host_nodes, l->value, 1);
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l = l->next;
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}
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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 || backend->force_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 (backend->force_prealloc) {
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if (value) {
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error_setg(errp,
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"remove -mem-prealloc to use the prealloc property");
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return;
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}
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}
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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, smp_cpus, &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_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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backend->merge = machine_mem_merge(machine);
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backend->dump = machine_dump_guest_core(machine);
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backend->prealloc = mem_prealloc;
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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 *
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host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp)
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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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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));
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assert(maxnode <= MAX_NODES);
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if (mbind(ptr, sz, backend->policy,
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maxnode ? backend->host_nodes : NULL, maxnode + 1, flags)) {
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if (backend->policy != MPOL_DEFAULT || errno != ENOSYS) {
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error_setg_errno(errp, errno,
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"cannot bind memory to host NUMA nodes");
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return;
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}
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}
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#endif
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/* Preallocate memory after the NUMA policy has been instantiated.
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* This is necessary to guarantee memory is allocated with
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* specified NUMA policy in place.
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*/
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if (backend->prealloc) {
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os_mem_prealloc(memory_region_get_fd(&backend->mr), ptr, sz,
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smp_cpus, &local_err);
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if (local_err) {
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goto out;
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}
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}
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}
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out:
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error_propagate(errp, local_err);
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}
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static bool
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host_memory_backend_can_be_deleted(UserCreatable *uc)
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{
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if (host_memory_backend_is_mapped(MEMORY_BACKEND(uc))) {
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return false;
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} else {
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return true;
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}
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}
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static char *get_id(Object *o, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(o);
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return g_strdup(backend->id);
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}
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static void set_id(Object *o, const char *str, Error **errp)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(o);
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if (backend->id) {
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error_setg(errp, "cannot change property value");
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return;
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}
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backend->id = g_strdup(str);
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}
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static void
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host_memory_backend_class_init(ObjectClass *oc, void *data)
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{
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UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
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ucc->complete = host_memory_backend_memory_complete;
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ucc->can_be_deleted = host_memory_backend_can_be_deleted;
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object_class_property_add_bool(oc, "merge",
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host_memory_backend_get_merge,
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host_memory_backend_set_merge, &error_abort);
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object_class_property_add_bool(oc, "dump",
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host_memory_backend_get_dump,
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host_memory_backend_set_dump, &error_abort);
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object_class_property_add_bool(oc, "prealloc",
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host_memory_backend_get_prealloc,
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host_memory_backend_set_prealloc, &error_abort);
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object_class_property_add(oc, "size", "int",
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host_memory_backend_get_size,
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host_memory_backend_set_size,
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NULL, NULL, &error_abort);
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object_class_property_add(oc, "host-nodes", "int",
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host_memory_backend_get_host_nodes,
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host_memory_backend_set_host_nodes,
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NULL, NULL, &error_abort);
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object_class_property_add_enum(oc, "policy", "HostMemPolicy",
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&HostMemPolicy_lookup,
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host_memory_backend_get_policy,
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host_memory_backend_set_policy, &error_abort);
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object_class_property_add_str(oc, "id", get_id, set_id, &error_abort);
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}
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static void host_memory_backend_finalize(Object *o)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(o);
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g_free(backend->id);
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}
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static const TypeInfo host_memory_backend_info = {
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.name = TYPE_MEMORY_BACKEND,
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.parent = TYPE_OBJECT,
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.abstract = true,
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.class_size = sizeof(HostMemoryBackendClass),
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.class_init = host_memory_backend_class_init,
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.instance_size = sizeof(HostMemoryBackend),
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.instance_init = host_memory_backend_init,
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.instance_finalize = host_memory_backend_finalize,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_USER_CREATABLE },
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{ }
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}
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};
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static void register_types(void)
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{
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type_register_static(&host_memory_backend_info);
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}
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type_init(register_types);
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