This switches the system emulator from a QemuOpts-based parser for
-object to user_creatable_parse_str() which uses a keyval parser and
enforces the QAPI schema.
Apart from being a cleanup, this makes non-scalar properties accessible.
This adopts a similar model as -blockdev uses: When parsing the option,
create the ObjectOptions and queue them. At the later point where we
used to create objects for the collected QemuOpts, the ObjectOptions
queue is processed instead.
A complication compared to -blockdev is that object definitions are
supported in -readconfig and -writeconfig.
After this patch, -readconfig still works, though it still goes through
the QemuOpts parser, which means that improvements like non-scalar
properties are still not available in config files.
-writeconfig stops working for -object. Tough luck. It has never
supported all options (not even the common ones), so supporting one less
isn't the end of the world. As object definitions from -readconfig still
go through QemuOpts, they are still included in -writeconfig output,
which at least prevents destroying your existing configuration when you
just wanted to add another option.
Signed-off-by: Kevin Wolf
---
softmmu/vl.c | 109 +++
1 file changed, 84 insertions(+), 25 deletions(-)
diff --git a/softmmu/vl.c b/softmmu/vl.c
index b219ce1f35..205c254542 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -113,6 +113,7 @@
#include "sysemu/replay.h"
#include "qapi/qapi-events-run-state.h"
#include "qapi/qapi-visit-block-core.h"
+#include "qapi/qapi-visit-qom.h"
#include "qapi/qapi-visit-ui.h"
#include "qapi/qapi-commands-block-core.h"
#include "qapi/qapi-commands-migration.h"
@@ -132,6 +133,14 @@ typedef struct BlockdevOptionsQueueEntry {
typedef QSIMPLEQ_HEAD(, BlockdevOptionsQueueEntry) BlockdevOptionsQueue;
+typedef struct ObjectOptionsQueueEntry {
+ObjectOptions *options;
+Location loc;
+QTAILQ_ENTRY(ObjectOptionsQueueEntry) next;
+} ObjectOptionsQueueEntry;
+
+typedef QTAILQ_HEAD(, ObjectOptionsQueueEntry) ObjectOptionsQueue;
+
static const char *cpu_option;
static const char *mem_path;
static const char *incoming;
@@ -143,6 +152,7 @@ static int snapshot;
static bool preconfig_requested;
static QemuPluginList plugin_list = QTAILQ_HEAD_INITIALIZER(plugin_list);
static BlockdevOptionsQueue bdo_queue = QSIMPLEQ_HEAD_INITIALIZER(bdo_queue);
+static ObjectOptionsQueue obj_queue = QTAILQ_HEAD_INITIALIZER(obj_queue);
static bool nographic = false;
static int mem_prealloc; /* force preallocation of physical target memory */
static ram_addr_t ram_size;
@@ -1691,12 +1701,9 @@ static int machine_set_property(void *opaque,
* cannot be created here, as it depends on the chardev
* already existing.
*/
-static bool object_create_early(const char *type, QemuOpts *opts)
+static bool object_create_early(ObjectOptions *options)
{
-if (user_creatable_print_help(type, opts)) {
-exit(0);
-}
-
+const char *type = ObjectType_str(options->qom_type);
/*
* Objects should not be made "delayed" without a reason. If you
* add one, state the reason in a comment!
@@ -1744,6 +1751,56 @@ static bool object_create_early(const char *type,
QemuOpts *opts)
return true;
}
+static void object_queue_create(bool early)
+{
+ObjectOptionsQueueEntry *entry, *next;
+
+QTAILQ_FOREACH_SAFE(entry, _queue, next, next) {
+if (early != object_create_early(entry->options)) {
+continue;
+}
+QTAILQ_REMOVE(_queue, entry, next);
+loc_push_restore(>loc);
+user_creatable_add_qapi(entry->options, _fatal);
+loc_pop(>loc);
+qapi_free_ObjectOptions(entry->options);
+g_free(entry);
+}
+}
+
+/*
+ * -readconfig still parses things into QemuOpts. Convert any such
+ * configurations to an ObjectOptionsQueueEntry.
+ *
+ * This is more restricted than the normal -object parser because QemuOpts
+ * parsed things, so no support for non-scalar properties. Help is also not
+ * supported (but this shouldn't be requested in a config file anyway).
+ */
+static int object_readconfig_to_qapi(void *opaque, QemuOpts *opts, Error
**errp)
+{
+ERRP_GUARD();
+ObjectOptionsQueueEntry *entry;
+ObjectOptions *options;
+QDict *args = qemu_opts_to_qdict(opts, NULL);
+Visitor *v;
+
+v = qobject_input_visitor_new_keyval(QOBJECT(args));
+visit_type_ObjectOptions(v, NULL, , errp);
+visit_free(v);
+qobject_unref(args);
+
+if (*errp) {
+return -1;
+}
+
+entry = g_new0(ObjectOptionsQueueEntry, 1);
+entry->options = options;
+loc_save(>loc);
+QTAILQ_INSERT_TAIL(_queue, entry, next);
+
+return 0;
+}
+
static void qemu_apply_machine_options(void)
{
MachineClass *machine_class = MACHINE_GET_CLASS(current_machine);
@@ -1816,8 +1873,8 @@ static void qemu_create_early_backends(void)
}
