On Wed, 19 Feb 2014 15:53:58 +0800 Hu Tao <hu...@cn.fujitsu.com> wrote:
> 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> > Signed-off-by: Hu Tao <hu...@cn.fujitsu.com> > > Signed-off-by: Hu Tao <hu...@cn.fujitsu.com> > --- this doesn't use complete() mathod of user_creatable pls, pickup more correct patch: https://github.com/imammedo/qemu/commit/19a4c596f4fab35706335e6dd01e94413195aa30 > backends/Makefile.objs | 2 + > backends/hostmem-ram.c | 48 ++++++++++++++++++ > backends/hostmem.c | 125 > +++++++++++++++++++++++++++++++++++++++++++++++ > include/sysemu/hostmem.h | 63 ++++++++++++++++++++++++ > 4 files changed, 238 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..a496dbd > --- /dev/null > +++ b/backends/hostmem-ram.c > @@ -0,0 +1,48 @@ > +/* > + * 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" > + > +#define TYPE_MEMORY_BACKEND_RAM "memory-ram" > + > + > +static int > +ram_backend_memory_init(HostMemoryBackend *backend, Error **errp) > +{ > + if (!memory_region_size(&backend->mr)) { > + memory_region_init_ram(&backend->mr, OBJECT(backend), > + object_get_canonical_path(OBJECT(backend)), > + backend->size); > + } > + > + return 0; > +} > + > +static void > +ram_backend_class_init(ObjectClass *oc, void *data) > +{ > + HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); > + > + bc->memory_init = 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..4b8fd8d > --- /dev/null > +++ b/backends/hostmem.c > @@ -0,0 +1,125 @@ > +/* > + * 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 > +hostmemory_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 > +hostmemory_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 hostmemory_backend_initfn(Object *obj) > +{ > + object_property_add(obj, "size", "int", > + hostmemory_backend_get_size, > + hostmemory_backend_set_size, NULL, NULL, NULL); > +} > + > +static void hostmemory_backend_finalize(Object *obj) > +{ > + HostMemoryBackend *backend = MEMORY_BACKEND(obj); > + > + if (memory_region_size(&backend->mr)) { > + memory_region_destroy(&backend->mr); > + } > +} > + > +static int > +hostmemory_backend_memory_init(HostMemoryBackend *backend, Error **errp) > +{ > + error_setg(errp, "memory_init is not implemented for type [%s]", > + object_get_typename(OBJECT(backend))); > + > + return -1; > +} > + > +MemoryRegion * > +host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp) > +{ > + HostMemoryBackendClass *bc = MEMORY_BACKEND_GET_CLASS(backend); > + Object *obj = OBJECT(backend); > + > + if (!backend->size) { > + error_setg(errp, "Invalid property [%s.size] value: %" PRIu64, > + object_get_typename(obj), backend->size); > + return NULL; > + } > + > + if (bc->memory_init(backend, errp) < 0) { > + return NULL; > + } > + > + return memory_region_size(&backend->mr) ? &backend->mr : NULL; > +} > + > +static void > +hostmemory_backend_class_init(ObjectClass *oc, void *data) > +{ > + HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); > + > + bc->memory_init = hostmemory_backend_memory_init; > +} > + > +static const TypeInfo hostmemory_backend_info = { > + .name = TYPE_MEMORY_BACKEND, > + .parent = TYPE_OBJECT, > + .abstract = true, > + .class_size = sizeof(HostMemoryBackendClass), > + .class_init = hostmemory_backend_class_init, > + .instance_size = sizeof(HostMemoryBackend), > + .instance_init = hostmemory_backend_initfn, > + .instance_finalize = hostmemory_backend_finalize, > + .interfaces = (InterfaceInfo[]) { > + { TYPE_USER_CREATABLE }, > + { } > + } > +}; > + > +static void register_types(void) > +{ > + type_register_static(&hostmemory_backend_info); > +} > + > +type_init(register_types); > diff --git a/include/sysemu/hostmem.h b/include/sysemu/hostmem.h > new file mode 100644 > index 0000000..5847943 > --- /dev/null > +++ b/include/sysemu/hostmem.h > @@ -0,0 +1,63 @@ > +/* > + * 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 > + * @memory_init: hook for derived classes to perform memory allocation > + */ > +struct HostMemoryBackendClass { > + ObjectClass parent_class; > + > + int (*memory_init)(HostMemoryBackend *backend, Error **errp); > +}; > + > +/** > + * @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
