1f07048933
Provides framework for splitting host RAM allocation/ policies into a separate backend that could be used by devices. Initially only legacy RAM backend is provided, which uses memory_region_init_ram() allocator and compatible with every CLI option that affects memory_region_init_ram(). Signed-off-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
98 lines
2.5 KiB
C
98 lines
2.5 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 "sysemu/hostmem.h"
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#include "sysemu/sysemu.h"
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#include "qapi/visitor.h"
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#include "qapi/qmp/qerror.h"
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#include "qemu/config-file.h"
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#include "qom/object_interfaces.h"
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static void
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hostmemory_backend_get_size(Object *obj, Visitor *v, void *opaque,
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const char *name, 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, &value, name, errp);
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}
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static void
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hostmemory_backend_set_size(Object *obj, Visitor *v, void *opaque,
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const char *name, 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 (memory_region_size(&backend->mr)) {
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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, &value, name, &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 hostmemory_backend_init(Object *obj)
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{
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object_property_add(obj, "size", "int",
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hostmemory_backend_get_size,
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hostmemory_backend_set_size, NULL, NULL, NULL);
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}
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static void hostmemory_backend_finalize(Object *obj)
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{
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HostMemoryBackend *backend = MEMORY_BACKEND(obj);
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if (memory_region_size(&backend->mr)) {
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memory_region_destroy(&backend->mr);
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}
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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 memory_region_size(&backend->mr) ? &backend->mr : NULL;
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}
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static const TypeInfo hostmemory_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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.instance_size = sizeof(HostMemoryBackend),
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.instance_init = hostmemory_backend_init,
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.instance_finalize = hostmemory_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(&hostmemory_backend_info);
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}
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type_init(register_types);
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