From: Igor Mammedov <imamm...@redhat.com> 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 <imamm...@redhat.com> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> --- backends/Makefile.objs | 2 + backends/hostmem-ram.c | 52 ++++++++++++++++++++++ backends/hostmem.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++ include/sysemu/hostmem.h | 60 ++++++++++++++++++++++++++ 4 files changed, 224 insertions(+) create mode 100644 backends/hostmem-ram.c create mode 100644 backends/hostmem.c create mode 100644 include/sysemu/hostmem.h diff --git a/backends/Makefile.objs b/backends/Makefile.objs index 42557d5..e6bdc11 100644 --- a/backends/Makefile.objs +++ b/backends/Makefile.objs @@ -6,3 +6,5 @@ common-obj-$(CONFIG_BRLAPI) += baum.o $(obj)/baum.o: QEMU_CFLAGS += $(SDL_CFLAGS) common-obj-$(CONFIG_TPM) += tpm.o + +common-obj-y += hostmem.o hostmem-ram.o diff --git a/backends/hostmem-ram.c b/backends/hostmem-ram.c new file mode 100644 index 0000000..ce06fbe --- /dev/null +++ b/backends/hostmem-ram.c @@ -0,0 +1,52 @@ +/* + * QEMU Host Memory Backend + * + * Copyright (C) 2013 Red Hat Inc + * + * Authors: + * Igor Mammedov <imamm...@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 "qom/object_interfaces.h" + +#define TYPE_MEMORY_BACKEND_RAM "memory-ram" + + +static void +ram_backend_memory_init(UserCreatable *uc, Error **errp) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(uc); + + if (!backend->size) { + error_setg(errp, "can't create backend with size 0"); + return; + } + + memory_region_init_ram(&backend->mr, OBJECT(backend), + object_get_canonical_path(OBJECT(backend)), + backend->size); +} + +static void +ram_backend_class_init(ObjectClass *oc, void *data) +{ + UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); + + ucc->complete = ram_backend_memory_init; +} + +static const TypeInfo ram_backend_info = { + .name = TYPE_MEMORY_BACKEND_RAM, + .parent = TYPE_MEMORY_BACKEND, + .class_init = ram_backend_class_init, +}; + +static void register_types(void) +{ + type_register_static(&ram_backend_info); +} + +type_init(register_types); diff --git a/backends/hostmem.c b/backends/hostmem.c new file mode 100644 index 0000000..06817dd --- /dev/null +++ b/backends/hostmem.c @@ -0,0 +1,110 @@ +/* + * QEMU Host Memory Backend + * + * Copyright (C) 2013 Red Hat Inc + * + * Authors: + * Igor Mammedov <imamm...@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 "sysemu/sysemu.h" +#include "qapi/visitor.h" +#include "qapi/qmp/qerror.h" +#include "qemu/config-file.h" +#include "qom/object_interfaces.h" + +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); + uint64_t value; + + if (memory_region_size(&backend->mr)) { + error_setg(errp, "cannot change property value\n"); + return; + } + + visit_type_size(v, &value, name, errp); + if (error_is_set(errp)) { + return; + } + if (!value) { + error_setg(errp, "Property '%s.%s' doesn't take value '%" PRIu64 "'", + object_get_typename(obj), name , value); + return; + } + backend->size = value; +} + +static void host_memory_backend_initfn(Object *obj) +{ + object_property_add(obj, "size", "int", + host_memory_backend_get_size, + host_memory_backend_set_size, NULL, NULL, NULL); +} + +static void host_memory_backend_finalize(Object *obj) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(obj); + + if (memory_region_size(&backend->mr)) { + memory_region_destroy(&backend->mr); + } +} + +static void +host_memory_backend_memory_init(UserCreatable *uc, Error **errp) +{ + error_setg(errp, "memory_init is not implemented for type [%s]", + object_get_typename(OBJECT(uc))); +} + +MemoryRegion * +host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp) +{ + return memory_region_size(&backend->mr) ? &backend->mr : NULL; +} + +static void +host_memory_backend_class_init(ObjectClass *oc, void *data) +{ + UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); + + ucc->complete = host_memory_backend_memory_init; +} + +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_initfn, + .instance_finalize = host_memory_backend_finalize, + .interfaces = (InterfaceInfo[]) { + { TYPE_USER_CREATABLE }, + { } + } +}; + +static void register_types(void) +{ + type_register_static(&host_memory_backend_info); +} + +type_init(register_types); diff --git a/include/sysemu/hostmem.h b/include/sysemu/hostmem.h new file mode 100644 index 0000000..bc3ffb3 --- /dev/null +++ b/include/sysemu/hostmem.h @@ -0,0 +1,60 @@ +/* + * QEMU Host Memory Backend + * + * Copyright (C) 2013 Red Hat Inc + * + * Authors: + * Igor Mammedov <imamm...@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. + */ +#ifndef QEMU_RAM_H +#define QEMU_RAM_H + +#include "qom/object.h" +#include "qapi/error.h" +#include "exec/memory.h" +#include "qemu/option.h" + +#define TYPE_MEMORY_BACKEND "memory" +#define MEMORY_BACKEND(obj) \ + OBJECT_CHECK(HostMemoryBackend, (obj), TYPE_MEMORY_BACKEND) +#define MEMORY_BACKEND_GET_CLASS(obj) \ + OBJECT_GET_CLASS(HostMemoryBackendClass, (obj), TYPE_MEMORY_BACKEND) +#define MEMORY_BACKEND_CLASS(klass) \ + OBJECT_CLASS_CHECK(HostMemoryBackendClass, (klass), TYPE_MEMORY_BACKEND) + +typedef struct HostMemoryBackend HostMemoryBackend; +typedef struct HostMemoryBackendClass HostMemoryBackendClass; + +/** + * HostMemoryBackendClass: + * @parent_class: opaque parent class container + */ +struct HostMemoryBackendClass { + ObjectClass parent_class; +}; + +/** + * @HostMemoryBackend + * + * @parent: opaque parent object container + * @size: amount of memory backend provides + * @id: unique identification string in memdev namespace + * @mr: MemoryRegion representing host memory belonging to backend + */ +struct HostMemoryBackend { + /* private */ + Object parent; + + /* protected */ + uint64_t size; + + MemoryRegion mr; +}; + +MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend, + Error **errp); + +#endif -- 1.8.5.3