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 <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
v5:
- drop default 'complete' method, allowing child not to implement it
- codestyle cleanups
v4:
- don't use nonexisting anymore error_is_set()
v3:
- fix path leak & use object_get_canonical_path_component()
for getting object name
v2:
- reuse UserCreatable interface instead of custom callbacks
---
backends/Makefile.objs | 2 +
backends/hostmem-ram.c | 54 +++++++++++++++++++++++++
backends/hostmem.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++
include/sysemu/hostmem.h | 60 ++++++++++++++++++++++++++++
4 files changed, 213 insertions(+), 0 deletions(-)
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 591ddcf..7fb7acd 100644
--- a/backends/Makefile.objs
+++ b/backends/Makefile.objs
@@ -6,3 +6,5 @@ common-obj-$(CONFIG_BRLAPI) += baum.o
baum.o-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..6c52ddc
--- /dev/null
+++ b/backends/hostmem-ram.c
@@ -0,0 +1,54 @@
+/*
+ * QEMU Host Memory Backend
+ *
+ * Copyright (C) 2013-2014 Red Hat Inc
+ *
+ * Authors:
+ * Igor Mammedov <address@hidden>
+ *
+ * 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);
+ char *path;
+
+ if (!backend->size) {
+ error_setg(errp, "can't create backend with size 0");
+ return;
+ }
+
+ path = object_get_canonical_path_component(OBJECT(backend));
+ memory_region_init_ram(&backend->mr, OBJECT(backend), path,
+ backend->size);
+ g_free(path);
+}
+
+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..2f578ac
--- /dev/null
+++ b/backends/hostmem.c
@@ -0,0 +1,97 @@
+/*
+ * QEMU Host Memory Backend
+ *
+ * Copyright (C) 2013-2014 Red Hat Inc
+ *
+ * Authors:
+ * Igor Mammedov <address@hidden>
+ *
+ * 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);
+ Error *local_err = NULL;
+ uint64_t value;
+
+ if (memory_region_size(&backend->mr)) {
+ error_setg(&local_err, "cannot change property value");
+ goto out;
+ }
+
+ visit_type_size(v, &value, name, &local_err);
+ if (local_err) {
+ goto out;
+ }
+ if (!value) {
+ error_setg(&local_err, "Property '%s.%s' doesn't take value '%"
+ PRIu64 "'", object_get_typename(obj), name, value);
+ goto out;
+ }
+ backend->size = value;
+out:
+ error_propagate(errp, local_err);
+}
+
+static void hostmemory_backend_init(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);
+ }
+}
+
+MemoryRegion *
+host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp)
+{
+ return memory_region_size(&backend->mr) ? &backend->mr : NULL;
+}
+
+static const TypeInfo hostmemory_backend_info = {
+ .name = TYPE_MEMORY_BACKEND,
+ .parent = TYPE_OBJECT,
+ .abstract = true,
+ .class_size = sizeof(HostMemoryBackendClass),
+ .instance_size = sizeof(HostMemoryBackend),
+ .instance_init = hostmemory_backend_init,
+ .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..6899fc3
--- /dev/null
+++ b/include/sysemu/hostmem.h
@@ -0,0 +1,60 @@
+/*
+ * QEMU Host Memory Backend
+ *
+ * Copyright (C) 2013-2014 Red Hat Inc
+ *
+ * Authors:
+ * Igor Mammedov <address@hidden>
+ *
+ * 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