#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
+#include "qemu/error-report.h"
#include "sysemu/hostmem.h"
#include "sysemu/sysemu.h"
#include "qom/object_interfaces.h"
struct HostMemoryBackendFile {
HostMemoryBackend parent_obj;
- bool share;
char *mem_path;
+ uint64_t align;
+ bool discard_data;
+ bool is_pmem;
};
static void
file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
{
HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend);
+#ifdef CONFIG_POSIX
+ gchar *path;
+#endif
if (!backend->size) {
error_setg(errp, "can't create backend with size 0");
error_setg(errp, "mem-path property not set");
return;
}
-#ifndef CONFIG_LINUX
+#ifndef CONFIG_POSIX
error_setg(errp, "-mem-path not supported on this host");
#else
- if (!memory_region_size(&backend->mr)) {
- 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);
- }
+ 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->align,
+ (backend->share ? RAM_SHARED : 0) |
+ (fb->is_pmem ? RAM_PMEM : 0),
+ fb->mem_path, errp);
+ g_free(path);
#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);
HostMemoryBackend *backend = MEMORY_BACKEND(o);
HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
- if (memory_region_size(&backend->mr)) {
+ if (host_memory_backend_mr_inited(backend)) {
error_setg(errp, "cannot change property value");
return;
}
fb->mem_path = g_strdup(str);
}
-static bool file_memory_backend_get_share(Object *o, Error **errp)
+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;
- return fb->share;
+ visit_type_size(v, name, &val, errp);
}
-static void file_memory_backend_set_share(Object *o, bool value, Error **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);
+ Error *local_err = NULL;
+ uint64_t val;
- if (memory_region_size(&backend->mr)) {
- error_setg(errp, "cannot change property value");
+ if (host_memory_backend_mr_inited(backend)) {
+ error_setg(&local_err, "cannot change property value");
+ goto out;
+ }
+
+ visit_type_size(v, name, &val, &local_err);
+ if (local_err) {
+ goto out;
+ }
+ fb->align = val;
+
+ out:
+ error_propagate(errp, local_err);
+}
+
+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->share = value;
+
+#ifndef CONFIG_LIBPMEM
+ if (value) {
+ Error *local_err = NULL;
+
+ error_setg(&local_err,
+ "Lack of libpmem support while setting the 'pmem=on'"
+ " of %s. We can't ensure data persistence.",
+ object_get_typename(o));
+ error_propagate(errp, local_err);
+ return;
+ }
+#endif
+
+ fb->is_pmem = 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_instance_init(Object *o)
+file_backend_class_init(ObjectClass *oc, void *data)
{
- 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);
+ 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,
+ &error_abort);
+ object_class_property_add_str(oc, "mem-path",
+ get_mem_path, set_mem_path,
+ &error_abort);
+ object_class_property_add(oc, "align", "int",
+ file_memory_backend_get_align,
+ file_memory_backend_set_align,
+ NULL, NULL, &error_abort);
+ object_class_property_add_bool(oc, "pmem",
+ file_memory_backend_get_pmem, file_memory_backend_set_pmem,
+ &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_init = file_backend_instance_init,
+ .instance_finalize = file_backend_instance_finalize,
.instance_size = sizeof(HostMemoryBackendFile),
};
projects / qemu.git / blobdiff