diff options
Diffstat (limited to 'backends/hostmem-file.c')
| -rw-r--r-- | backends/hostmem-file.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c new file mode 100644 index 000000000..cd038024f --- /dev/null +++ b/backends/hostmem-file.c @@ -0,0 +1,228 @@ +/* + * QEMU Host Memory Backend for hugetlbfs + * + * Copyright (C) 2013-2014 Red Hat Inc + * + * Authors: + * Paolo Bonzini <pbonzini@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 "qemu/osdep.h" +#include "qapi/error.h" +#include "qemu/error-report.h" +#include "qemu/module.h" +#include "sysemu/hostmem.h" +#include "qom/object_interfaces.h" +#include "qom/object.h" + +OBJECT_DECLARE_SIMPLE_TYPE(HostMemoryBackendFile, MEMORY_BACKEND_FILE) + + +struct HostMemoryBackendFile { + HostMemoryBackend parent_obj; + + char *mem_path; + uint64_t align; + bool discard_data; + bool is_pmem; + bool readonly; +}; + +static void +file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) +{ +#ifndef CONFIG_POSIX + error_setg(errp, "backend '%s' not supported on this host", + object_get_typename(OBJECT(backend))); +#else + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend); + uint32_t ram_flags; + gchar *name; + + if (!backend->size) { + error_setg(errp, "can't create backend with size 0"); + return; + } + if (!fb->mem_path) { + error_setg(errp, "mem-path property not set"); + return; + } + + name = host_memory_backend_get_name(backend); + ram_flags = backend->share ? RAM_SHARED : 0; + ram_flags |= backend->reserve ? 0 : RAM_NORESERVE; + ram_flags |= fb->is_pmem ? RAM_PMEM : 0; + memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), name, + backend->size, fb->align, ram_flags, + fb->mem_path, fb->readonly, errp); + g_free(name); +#endif +} + +static char *get_mem_path(Object *o, Error **errp) +{ + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + + return g_strdup(fb->mem_path); +} + +static void set_mem_path(Object *o, const char *str, Error **errp) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(o); + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + + if (host_memory_backend_mr_inited(backend)) { + error_setg(errp, "cannot change property 'mem-path' of %s", + object_get_typename(o)); + return; + } + g_free(fb->mem_path); + fb->mem_path = g_strdup(str); +} + +static bool file_memory_backend_get_discard_data(Object *o, Error **errp) +{ + return MEMORY_BACKEND_FILE(o)->discard_data; +} + +static void file_memory_backend_set_discard_data(Object *o, bool value, + Error **errp) +{ + MEMORY_BACKEND_FILE(o)->discard_data = value; +} + +static void file_memory_backend_get_align(Object *o, Visitor *v, + const char *name, void *opaque, + Error **errp) +{ + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + uint64_t val = fb->align; + + visit_type_size(v, name, &val, errp); +} + +static void file_memory_backend_set_align(Object *o, Visitor *v, + const char *name, void *opaque, + Error **errp) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(o); + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + uint64_t val; + + if (host_memory_backend_mr_inited(backend)) { + error_setg(errp, "cannot change property '%s' of %s", name, + object_get_typename(o)); + return; + } + + if (!visit_type_size(v, name, &val, errp)) { + return; + } + fb->align = val; +} + +#ifdef CONFIG_LIBPMEM +static bool file_memory_backend_get_pmem(Object *o, Error **errp) +{ + return MEMORY_BACKEND_FILE(o)->is_pmem; +} + +static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(o); + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + + if (host_memory_backend_mr_inited(backend)) { + error_setg(errp, "cannot change property 'pmem' of %s.", + object_get_typename(o)); + return; + } + + fb->is_pmem = value; +} +#endif /* CONFIG_LIBPMEM */ + +static bool file_memory_backend_get_readonly(Object *obj, Error **errp) +{ + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); + + return fb->readonly; +} + +static void file_memory_backend_set_readonly(Object *obj, bool value, + Error **errp) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(obj); + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); + + if (host_memory_backend_mr_inited(backend)) { + error_setg(errp, "cannot change property 'readonly' of %s.", + object_get_typename(obj)); + return; + } + + fb->readonly = value; +} + +static void file_backend_unparent(Object *obj) +{ + HostMemoryBackend *backend = MEMORY_BACKEND(obj); + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(obj); + + if (host_memory_backend_mr_inited(backend) && fb->discard_data) { + void *ptr = memory_region_get_ram_ptr(&backend->mr); + uint64_t sz = memory_region_size(&backend->mr); + + qemu_madvise(ptr, sz, QEMU_MADV_REMOVE); + } +} + +static void +file_backend_class_init(ObjectClass *oc, void *data) +{ + HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); + + bc->alloc = file_backend_memory_alloc; + oc->unparent = file_backend_unparent; + + object_class_property_add_bool(oc, "discard-data", + file_memory_backend_get_discard_data, file_memory_backend_set_discard_data); + object_class_property_add_str(oc, "mem-path", + get_mem_path, set_mem_path); + object_class_property_add(oc, "align", "int", + file_memory_backend_get_align, + file_memory_backend_set_align, + NULL, NULL); +#ifdef CONFIG_LIBPMEM + object_class_property_add_bool(oc, "pmem", + file_memory_backend_get_pmem, file_memory_backend_set_pmem); +#endif + object_class_property_add_bool(oc, "readonly", + file_memory_backend_get_readonly, + file_memory_backend_set_readonly); +} + +static void file_backend_instance_finalize(Object *o) +{ + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + + g_free(fb->mem_path); +} + +static const TypeInfo file_backend_info = { + .name = TYPE_MEMORY_BACKEND_FILE, + .parent = TYPE_MEMORY_BACKEND, + .class_init = file_backend_class_init, + .instance_finalize = file_backend_instance_finalize, + .instance_size = sizeof(HostMemoryBackendFile), +}; + +static void register_types(void) +{ + type_register_static(&file_backend_info); +} + +type_init(register_types); |