#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
+#include "qemu/madvise.h"
#include "sysemu/hostmem.h"
-#include "sysemu/sysemu.h"
#include "qom/object_interfaces.h"
#include "qom/object.h"
char *mem_path;
uint64_t align;
+ uint64_t offset;
bool discard_data;
bool is_pmem;
bool readonly;
object_get_typename(OBJECT(backend)));
#else
HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend);
+ uint32_t ram_flags;
gchar *name;
if (!backend->size) {
}
name = host_memory_backend_get_name(backend);
- memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
- name,
- backend->size, fb->align,
- (backend->share ? RAM_SHARED : 0) |
- (fb->is_pmem ? RAM_PMEM : 0),
- fb->mem_path, fb->readonly, errp);
+ ram_flags = backend->share ? RAM_SHARED : 0;
+ ram_flags |= backend->reserve ? 0 : RAM_NORESERVE;
+ ram_flags |= fb->is_pmem ? RAM_PMEM : 0;
+ ram_flags |= RAM_NAMED_FILE;
+ memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), name,
+ backend->size, fb->align, ram_flags,
+ fb->mem_path, fb->offset, fb->readonly,
+ errp);
g_free(name);
#endif
}
fb->align = val;
}
-static bool file_memory_backend_get_pmem(Object *o, Error **errp)
+static void file_memory_backend_get_offset(Object *o, Visitor *v,
+ const char *name, void *opaque,
+ Error **errp)
{
- return MEMORY_BACKEND_FILE(o)->is_pmem;
+ HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
+ uint64_t val = fb->offset;
+
+ visit_type_size(v, name, &val, errp);
}
-static void file_memory_backend_set_pmem(Object *o, bool value, Error **errp)
+static void file_memory_backend_set_offset(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 'pmem' of %s.",
+ error_setg(errp, "cannot change property '%s' of %s", name,
object_get_typename(o));
return;
}
-#ifndef CONFIG_LIBPMEM
- if (value) {
- error_setg(errp, "Lack of libpmem support while setting the 'pmem=on'"
- " of %s. We can't ensure data persistence.",
+ if (!visit_type_size(v, name, &val, errp)) {
+ return;
+ }
+ fb->offset = 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;
}
-#endif
fb->is_pmem = value;
}
+#endif /* CONFIG_LIBPMEM */
static bool file_memory_backend_get_readonly(Object *obj, Error **errp)
{
file_memory_backend_get_align,
file_memory_backend_set_align,
NULL, NULL);
+ object_class_property_add(oc, "offset", "int",
+ file_memory_backend_get_offset,
+ file_memory_backend_set_offset,
+ NULL, NULL);
+ object_class_property_set_description(oc, "offset",
+ "Offset into the target file (ex: 1G)");
+#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);