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author | 2015-08-28 09:58:54 +0800 | |
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committer | 2015-09-01 12:44:00 +0800 | |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/backends/hostmem-file.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/backends/hostmem-file.c')
-rw-r--r-- | qemu/backends/hostmem-file.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/qemu/backends/hostmem-file.c b/qemu/backends/hostmem-file.c new file mode 100644 index 000000000..4b5536101 --- /dev/null +++ b/qemu/backends/hostmem-file.c @@ -0,0 +1,134 @@ +/* + * 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-common.h" +#include "sysemu/hostmem.h" +#include "sysemu/sysemu.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; + + bool share; + 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)) { + backend->force_prealloc = mem_prealloc; + memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), + object_get_canonical_path(OBJECT(backend)), + backend->size, fb->share, + 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 bool file_memory_backend_get_share(Object *o, Error **errp) +{ + HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o); + + return fb->share; +} + +static void file_memory_backend_set_share(Object *o, bool value, 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; + } + fb->share = value; +} + +static void +file_backend_instance_init(Object *o) +{ + object_property_add_bool(o, "share", + file_memory_backend_get_share, + file_memory_backend_set_share, NULL); + 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); |