mirror of https://gitee.com/openkylin/qemu.git
142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/*
|
|
* 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-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 (!host_memory_backend_mr_inited(backend)) {
|
|
gchar *path;
|
|
backend->force_prealloc = mem_prealloc;
|
|
path = object_get_canonical_path(OBJECT(backend));
|
|
memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
|
|
path,
|
|
backend->size, fb->share,
|
|
fb->mem_path, errp);
|
|
g_free(path);
|
|
}
|
|
#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 value");
|
|
return;
|
|
}
|
|
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 (host_memory_backend_mr_inited(backend)) {
|
|
error_setg(errp, "cannot change property value");
|
|
return;
|
|
}
|
|
fb->share = value;
|
|
}
|
|
|
|
static void
|
|
file_backend_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
|
|
|
|
bc->alloc = file_backend_memory_alloc;
|
|
|
|
object_class_property_add_bool(oc, "share",
|
|
file_memory_backend_get_share, file_memory_backend_set_share,
|
|
&error_abort);
|
|
object_class_property_add_str(oc, "mem-path",
|
|
get_mem_path, set_mem_path,
|
|
&error_abort);
|
|
}
|
|
|
|
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);
|