diff options
| -rw-r--r-- | backends/Makefile.objs | 1 | ||||
| -rw-r--r-- | backends/hostmem-file.c | 107 |
2 files changed, 108 insertions, 0 deletions
diff --git a/backends/Makefile.objs b/backends/Makefile.objs index 7fb7acdd11..506a46c33b 100644 --- a/backends/Makefile.objs +++ b/backends/Makefile.objs @@ -8,3 +8,4 @@ baum.o-cflags := $(SDL_CFLAGS) common-obj-$(CONFIG_TPM) += tpm.o common-obj-y += hostmem.o hostmem-ram.o +common-obj-$(CONFIG_LINUX) += hostmem-file.o diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c new file mode 100644 index 0000000000..55d1c62ddd --- /dev/null +++ b/backends/hostmem-file.c @@ -0,0 +1,107 @@ +/* + * 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 "sysemu/hostmem.h" +#include "qom/object_interfaces.h" + +/* hostmem-file.c */ +/** + * @TYPE_MEMORY_BACKEND_FILE: + * name of backend that uses mmap on a file descriptor + */ +#define TYPE_MEMORY_BACKEND_FILE "memory-backend-file" + +#define MEMORY_BACKEND_FILE(obj) \ + OBJECT_CHECK(HostMemoryBackendFile, (obj), TYPE_MEMORY_BACKEND_FILE) + +typedef struct HostMemoryBackendFile HostMemoryBackendFile; + +struct HostMemoryBackendFile { + HostMemoryBackend parent_obj; + char *mem_path; +}; + +static void +file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) +{ + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend); + + 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; + } +#ifndef CONFIG_LINUX + error_setg(errp, "-mem-path not supported on this host"); +#else + if (!memory_region_size(&backend->mr)) { + memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), + object_get_canonical_path(OBJECT(backend)), + backend->size, + fb->mem_path, errp); + } +#endif +} + +static void +file_backend_class_init(ObjectClass *oc, void *data) +{ + HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc); + + bc->alloc = file_backend_memory_alloc; +} + +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 (memory_region_size(&backend->mr)) { + error_setg(errp, "cannot change property value"); + return; + } + if (fb->mem_path) { + g_free(fb->mem_path); + } + fb->mem_path = g_strdup(str); +} + +static void +file_backend_instance_init(Object *o) +{ + object_property_add_str(o, "mem-path", get_mem_path, + set_mem_path, NULL); +} + +static const TypeInfo file_backend_info = { + .name = TYPE_MEMORY_BACKEND_FILE, + .parent = TYPE_MEMORY_BACKEND, + .class_init = file_backend_class_init, + .instance_init = file_backend_instance_init, + .instance_size = sizeof(HostMemoryBackendFile), +}; + +static void register_types(void) +{ + type_register_static(&file_backend_info); +} + +type_init(register_types); |