event_notifier: prevent accidental use after close

[mirror_qemu.git] / backends / hostmem-file.c

diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
index 55d1c62ddda96135120d02481b196b862844eea2..42efb2f28a221a89c41f79fefe8dbf92cabf0e0b 100644 (file)
--- a/backends/hostmem-file.c
+++ b/backends/hostmem-file.c
@@ -9,7 +9,11 @@
  * 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 */
@@ -26,6 +30,8 @@ typedef struct HostMemoryBackendFile HostMemoryBackendFile;
 
 struct HostMemoryBackendFile {
     HostMemoryBackend parent_obj;
+
+    bool share;
     char *mem_path;
 };
 
@@ -39,29 +45,25 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
         return;
     }
     if (!fb->mem_path) {
-        error_setg(errp, "mem_path property not set");
+        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)) {
+        gchar *path;
+        backend->force_prealloc = mem_prealloc;
+        path = object_get_canonical_path(OBJECT(backend));
         memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
-                                 object_get_canonical_path(OBJECT(backend)),
-                                 backend->size,
+                                 path,
+                                 backend->size, fb->share,
                                  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);
@@ -78,24 +80,56 @@ static void set_mem_path(Object *o, const char *str, Error **errp)
         error_setg(errp, "cannot change property value");
         return;
     }
-    if (fb->mem_path) {
-        g_free(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)
+file_backend_class_init(ObjectClass *oc, void *data)
 {
-    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;
+
+    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_init = file_backend_instance_init,
+    .instance_finalize = file_backend_instance_finalize,
     .instance_size = sizeof(HostMemoryBackendFile),
 };