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authorPeter Maydell <peter.maydell@linaro.org>2018-12-13 13:41:44 +0000
committerPeter Maydell <peter.maydell@linaro.org>2018-12-13 13:41:44 +0000
commitc3ec0fa1a8e815ecfec9eabb9c20ee206c313e07 (patch)
tree8de8111f4fffb7c3bc3e5b12ad72105c7206cd1c
parent6145a6d84b3bf0f25935b88543febe076c61b0f4 (diff)
parentc55f070b7195cee4e06998c10f57f13c7df98dbd (diff)
downloadqemu-arm-c3ec0fa1a8e815ecfec9eabb9c20ee206c313e07.tar.gz
Merge remote-tracking branch 'remotes/armbru/tags/pull-monitor-2018-12-12' into staging
Monitor patches for 2018-12-12 # gpg: Signature made Wed 12 Dec 2018 10:08:15 GMT # gpg: using RSA key 3870B400EB918653 # gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" # gpg: aka "Markus Armbruster <armbru@pond.sub.org>" # Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653 * remotes/armbru/tags/pull-monitor-2018-12-12: tests: add oob functional test for test-qmp-cmds Revert "tests: Add parameter to qtest_init_without_qmp_handshake" monitor: Remove "x-oob", offer capability "oob" unconditionally monitor: Suspend monitor instead dropping commands monitor: avoid potential dead-lock when cleaning up monitor: prevent inserting new monitors after cleanup colo: check chardev can switch context monitor: check if chardev can switch gcontext for OOB char: add a QEMU_CHAR_FEATURE_GCONTEXT flag monitor: accept chardev input from iothread monitor: inline ambiguous helper functions Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--chardev/char.c11
-rw-r--r--docs/interop/qmp-spec.txt5
-rw-r--r--include/chardev/char.h3
-rw-r--r--include/monitor/monitor.h3
-rw-r--r--monitor.c139
-rw-r--r--net/colo-compare.c6
-rw-r--r--qapi/misc.json40
-rw-r--r--tests/libqtest.c9
-rw-r--r--tests/libqtest.h4
-rw-r--r--tests/qmp-test.c6
-rw-r--r--tests/test-qmp-cmds.c16
-rw-r--r--vl.c5
12 files changed, 118 insertions, 129 deletions
diff --git a/chardev/char.c b/chardev/char.c
index 152dde5327..ccba36bafb 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -193,6 +193,8 @@ void qemu_chr_be_update_read_handlers(Chardev *s,
{
ChardevClass *cc = CHARDEV_GET_CLASS(s);
+ assert(qemu_chr_has_feature(s, QEMU_CHAR_FEATURE_GCONTEXT)
+ || !context);
s->gcontext = context;
if (cc->chr_update_read_handler) {
cc->chr_update_read_handler(s);
@@ -240,6 +242,15 @@ static void char_init(Object *obj)
chr->logfd = -1;
qemu_mutex_init(&chr->chr_write_lock);
+
+ /*
+ * Assume if chr_update_read_handler is implemented it will
+ * take the updated gcontext into account.
+ */
+ if (CHARDEV_GET_CLASS(chr)->chr_update_read_handler) {
+ qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_GCONTEXT);
+ }
+
}
static int null_chr_write(Chardev *chr, const uint8_t *buf, int len)
diff --git a/docs/interop/qmp-spec.txt b/docs/interop/qmp-spec.txt
index 8f7da0245d..67e44a8120 100644
--- a/docs/interop/qmp-spec.txt
+++ b/docs/interop/qmp-spec.txt
@@ -130,8 +130,9 @@ to pass "id" with out-of-band commands. Passing it with all commands
is recommended for clients that accept capability "oob".
If the client sends in-band commands faster than the server can
-execute them, the server will eventually drop commands to limit the
-queue length. The sever sends event COMMAND_DROPPED then.
+execute them, the server will stop reading the requests from the QMP
+channel until the request queue length is reduced to an acceptable
+range.
Only a few commands support out-of-band execution. The ones that do
have "allow-oob": true in output of query-qmp-schema.
diff --git a/include/chardev/char.h b/include/chardev/char.h
index 7becd8c80c..014566c3de 100644
--- a/include/chardev/char.h
+++ b/include/chardev/char.h
@@ -47,6 +47,9 @@ typedef enum {
QEMU_CHAR_FEATURE_FD_PASS,
/* Whether replay or record mode is enabled */
QEMU_CHAR_FEATURE_REPLAY,
+ /* Whether the gcontext can be changed after calling
+ * qemu_chr_be_update_read_handlers() */
+ QEMU_CHAR_FEATURE_GCONTEXT,
QEMU_CHAR_FEATURE_LAST,
} ChardevFeature;
diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
index 6fd2c53b09..c1b40a9cac 100644
--- a/include/monitor/monitor.h
+++ b/include/monitor/monitor.h
@@ -13,7 +13,8 @@ extern __thread Monitor *cur_mon;
#define MONITOR_USE_READLINE 0x02
#define MONITOR_USE_CONTROL 0x04
#define MONITOR_USE_PRETTY 0x08
-#define MONITOR_USE_OOB 0x10
+
+#define QMP_REQ_QUEUE_LEN_MAX 8
bool monitor_cur_is_qmp(void);
diff --git a/monitor.c b/monitor.c
index d39390c2f2..6e81b09294 100644
--- a/monitor.c
+++ b/monitor.c
@@ -263,10 +263,11 @@ typedef struct QMPRequest QMPRequest;
/* QMP checker flags */
#define QMP_ACCEPT_UNKNOWNS 1
-/* Protects mon_list, monitor_qapi_event_state. */
+/* Protects mon_list, monitor_qapi_event_state, monitor_destroyed. */
static QemuMutex monitor_lock;
static GHashTable *monitor_qapi_event_state;
static QTAILQ_HEAD(mon_list, Monitor) mon_list;
+static bool monitor_destroyed;
/* Protects mon_fdsets */
static QemuMutex mon_fdsets_lock;
@@ -4109,8 +4110,12 @@ static void monitor_qmp_dispatch(Monitor *mon, QObject *req, QObject *id)
* processing commands only on a very busy monitor. To achieve that,
* when we process one request on a specific monitor, we put that
* monitor to the end of mon_list queue.
+ *
+ * Note: if the function returned with non-NULL, then the caller will
+ * be with mon->qmp.qmp_queue_lock held, and the caller is responsible
+ * to release it.
*/
-static QMPRequest *monitor_qmp_requests_pop_any(void)
+static QMPRequest *monitor_qmp_requests_pop_any_with_lock(void)
{
QMPRequest *req_obj = NULL;
Monitor *mon;
@@ -4120,10 +4125,11 @@ static QMPRequest *monitor_qmp_requests_pop_any(void)
QTAILQ_FOREACH(mon, &mon_list, entry) {
qemu_mutex_lock(&mon->qmp.qmp_queue_lock);
req_obj = g_queue_pop_head(mon->qmp.qmp_requests);
- qemu_mutex_unlock(&mon->qmp.qmp_queue_lock);
if (req_obj) {
+ /* With the lock of corresponding queue held */
break;
}
+ qemu_mutex_unlock(&mon->qmp.qmp_queue_lock);
}
if (req_obj) {
@@ -4142,30 +4148,34 @@ static QMPRequest *monitor_qmp_requests_pop_any(void)
static void monitor_qmp_bh_dispatcher(void *data)
{
- QMPRequest *req_obj = monitor_qmp_requests_pop_any();
+ QMPRequest *req_obj = monitor_qmp_requests_pop_any_with_lock();
QDict *rsp;
bool need_resume;
+ Monitor *mon;
if (!req_obj) {
return;
}
+ mon = req_obj->mon;
/* qmp_oob_enabled() might change after "qmp_capabilities" */
- need_resume = !qmp_oob_enabled(req_obj->mon);
+ need_resume = !qmp_oob_enabled(mon) ||
+ mon->qmp.qmp_requests->length == QMP_REQ_QUEUE_LEN_MAX - 1;
+ qemu_mutex_unlock(&mon->qmp.qmp_queue_lock);
if (req_obj->req) {
trace_monitor_qmp_cmd_in_band(qobject_get_try_str(req_obj->id) ?: "");
- monitor_qmp_dispatch(req_obj->mon, req_obj->req, req_obj->id);
+ monitor_qmp_dispatch(mon, req_obj->req, req_obj->id);
} else {
assert(req_obj->err);
rsp = qmp_error_response(req_obj->err);
req_obj->err = NULL;
- monitor_qmp_respond(req_obj->mon, rsp, NULL);
+ monitor_qmp_respond(mon, rsp, NULL);
qobject_unref(rsp);
}
if (need_resume) {
/* Pairs with the monitor_suspend() in handle_qmp_command() */
- monitor_resume(req_obj->mon);
+ monitor_resume(mon);
}
qmp_request_free(req_obj);
@@ -4173,8 +4183,6 @@ static void monitor_qmp_bh_dispatcher(void *data)
qemu_bh_schedule(qmp_dispatcher_bh);
}
-#define QMP_REQ_QUEUE_LEN_MAX (8)
-
static void handle_qmp_command(void *opaque, QObject *req, Error *err)
{
Monitor *mon = opaque;
@@ -4216,28 +4224,14 @@ static void handle_qmp_command(void *opaque, QObject *req, Error *err)
qemu_mutex_lock(&mon->qmp.qmp_queue_lock);
/*
- * If OOB is not enabled on the current monitor, we'll emulate the
- * old behavior that we won't process the current monitor any more
- * until it has responded. This helps make sure that as long as
- * OOB is not enabled, the server will never drop any command.
+ * Suspend the monitor when we can't queue more requests after
+ * this one. Dequeuing in monitor_qmp_bh_dispatcher() will resume
+ * it. Note that when OOB is disabled, we queue at most one
+ * command, for backward compatibility.
*/
- if (!qmp_oob_enabled(mon)) {
+ if (!qmp_oob_enabled(mon) ||
+ mon->qmp.qmp_requests->length == QMP_REQ_QUEUE_LEN_MAX - 1) {
monitor_suspend(mon);
- } else {
- /* Drop the request if queue is full. */
- if (mon->qmp.qmp_requests->length >= QMP_REQ_QUEUE_LEN_MAX) {
- qemu_mutex_unlock(&mon->qmp.qmp_queue_lock);
- /*
- * FIXME @id's scope is just @mon, and broadcasting it is
- * wrong. If another monitor's client has a command with
- * the same ID in flight, the event will incorrectly claim
- * that command was dropped.
- */
- qapi_event_send_command_dropped(id,
- COMMAND_DROP_REASON_QUEUE_FULL);
- qmp_request_free(req_obj);
- return;
- }
}
/*
@@ -4245,6 +4239,7 @@ static void handle_qmp_command(void *opaque, QObject *req, Error *err)
* handled in time order. Ownership for req_obj, req, id,
* etc. will be delivered to the handler side.
*/
+ assert(mon->qmp.qmp_requests->length < QMP_REQ_QUEUE_LEN_MAX);
g_queue_push_tail(mon->qmp.qmp_requests, req_obj);
qemu_mutex_unlock(&mon->qmp.qmp_queue_lock);
@@ -4297,7 +4292,7 @@ int monitor_suspend(Monitor *mon)
atomic_inc(&mon->suspend_cnt);
- if (monitor_is_qmp(mon) && mon->use_io_thread) {
+ if (mon->use_io_thread) {
/*
* Kick I/O thread to make sure this takes effect. It'll be
* evaluated again in prepare() of the watch object.
@@ -4309,6 +4304,13 @@ int monitor_suspend(Monitor *mon)
return 0;
}
+static void monitor_accept_input(void *opaque)
+{
+ Monitor *mon = opaque;
+
+ qemu_chr_fe_accept_input(&mon->chr);
+}
+
void monitor_resume(Monitor *mon)
{
if (monitor_is_hmp_non_interactive(mon)) {
@@ -4316,20 +4318,22 @@ void monitor_resume(Monitor *mon)
}
if (atomic_dec_fetch(&mon->suspend_cnt) == 0) {
- if (monitor_is_qmp(mon)) {
- /*
- * For QMP monitors that are running in the I/O thread,
- * let's kick the thread in case it's sleeping.
- */
- if (mon->use_io_thread) {
- aio_notify(iothread_get_aio_context(mon_iothread));
- }
+ AioContext *ctx;
+
+ if (mon->use_io_thread) {
+ ctx = iothread_get_aio_context(mon_iothread);
} else {
+ ctx = qemu_get_aio_context();
+ }
+
+ if (!monitor_is_qmp(mon)) {
assert(mon->rs);
readline_show_prompt(mon->rs);
}
- qemu_chr_fe_accept_input(&mon->chr);
+
+ aio_bh_schedule_oneshot(ctx, monitor_accept_input, mon);
}
+
trace_monitor_suspend(mon, -1);
}
@@ -4453,16 +4457,6 @@ static void sortcmdlist(void)
qsort((void *)info_cmds, array_num, elem_size, compare_mon_cmd);
}
-static GMainContext *monitor_get_io_context(void)
-{
- return iothread_get_g_main_context(mon_iothread);
-}
-
-static AioContext *monitor_get_aio_context(void)
-{
- return iothread_get_aio_context(mon_iothread);
-}
-
static void monitor_iothread_init(void)
{
mon_iothread = iothread_create("mon_iothread", &error_abort);
@@ -4539,8 +4533,21 @@ void error_vprintf_unless_qmp(const char *fmt, va_list ap)
static void monitor_list_append(Monitor *mon)
{
qemu_mutex_lock(&monitor_lock);
- QTAILQ_INSERT_HEAD(&mon_list, mon, entry);
+ /*
+ * This prevents inserting new monitors during monitor_cleanup().
+ * A cleaner solution would involve the main thread telling other
+ * threads to terminate, waiting for their termination.
+ */
+ if (!monitor_destroyed) {
+ QTAILQ_INSERT_HEAD(&mon_list, mon, entry);
+ mon = NULL;
+ }
qemu_mutex_unlock(&monitor_lock);
+
+ if (mon) {
+ monitor_data_destroy(mon);
+ g_free(mon);
+ }
}
static void monitor_qmp_setup_handlers_bh(void *opaque)
@@ -4549,7 +4556,7 @@ static void monitor_qmp_setup_handlers_bh(void *opaque)
GMainContext *context;
assert(mon->use_io_thread);
- context = monitor_get_io_context();
+ context = iothread_get_g_main_context(mon_iothread);
assert(context);
qemu_chr_fe_set_handlers(&mon->chr, monitor_can_read, monitor_qmp_read,
monitor_qmp_event, NULL, mon, context, true);
@@ -4560,21 +4567,12 @@ void monitor_init(Chardev *chr, int flags)
{
Monitor *mon = g_malloc(sizeof(*mon));
bool use_readline = flags & MONITOR_USE_READLINE;
- bool use_oob = flags & MONITOR_USE_OOB;
- if (use_oob) {
- if (CHARDEV_IS_MUX(chr)) {
- error_report("Monitor out-of-band is not supported with "
- "MUX typed chardev backend");
- exit(1);
- }
- if (use_readline) {
- error_report("Monitor out-of-band is only supported by QMP");
- exit(1);
- }
- }
-
- monitor_data_init(mon, false, use_oob);
+ /* Note: we run QMP monitor in I/O thread when @chr supports that */
+ monitor_data_init(mon, false,
+ (flags & MONITOR_USE_CONTROL)
+ && qemu_chr_has_feature(chr,
+ QEMU_CHAR_FEATURE_GCONTEXT));
qemu_chr_fe_init(&mon->chr, chr, &error_abort);
mon->flags = flags;
@@ -4601,7 +4599,7 @@ void monitor_init(Chardev *chr, int flags)
* since chardev might be running in the monitor I/O
* thread. Schedule a bottom half.
*/
- aio_bh_schedule_oneshot(monitor_get_aio_context(),
+ aio_bh_schedule_oneshot(iothread_get_aio_context(mon_iothread),
monitor_qmp_setup_handlers_bh, mon);
/* The bottom half will add @mon to @mon_list */
return;
@@ -4634,10 +4632,14 @@ void monitor_cleanup(void)
/* Flush output buffers and destroy monitors */
qemu_mutex_lock(&monitor_lock);
+ monitor_destroyed = true;
QTAILQ_FOREACH_SAFE(mon, &mon_list, entry, next) {
QTAILQ_REMOVE(&mon_list, mon, entry);
+ /* Permit QAPI event emission from character frontend release */
+ qemu_mutex_unlock(&monitor_lock);
monitor_flush(mon);
monitor_data_destroy(mon);
+ qemu_mutex_lock(&monitor_lock);
g_free(mon);
}
qemu_mutex_unlock(&monitor_lock);
@@ -4665,9 +4667,6 @@ QemuOptsList qemu_mon_opts = {
},{
.name = "pretty",
.type = QEMU_OPT_BOOL,
- },{
- .name = "x-oob",
- .type = QEMU_OPT_BOOL,
},
{ /* end of list */ }
},
diff --git a/net/colo-compare.c b/net/colo-compare.c
index a39191d522..9156ab3349 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -957,6 +957,12 @@ static int find_and_check_chardev(Chardev **chr,
return 1;
}
+ if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_GCONTEXT)) {
+ error_setg(errp, "chardev \"%s\" cannot switch context",
+ chr_name);
+ return 1;
+ }
+
return 0;
}
diff --git a/qapi/misc.json b/qapi/misc.json
index 45121492dd..4211a732f3 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -3445,46 +3445,6 @@
{ 'command': 'query-sev-capabilities', 'returns': 'SevCapability' }
##
-# @CommandDropReason:
-#
-# Reasons that caused one command to be dropped.
-#
-# @queue-full: the command queue is full. This can only occur when
-# the client sends a new non-oob command before the
-# response to the previous non-oob command has been
-# received.
-#
-# Since: 2.12
-##
-{ 'enum': 'CommandDropReason',
- 'data': [ 'queue-full' ] }
-
-##
-# @COMMAND_DROPPED:
-#
-# Emitted when a command is dropped due to some reason. Commands can
-# only be dropped when the oob capability is enabled.
-#
-# @id: The dropped command's "id" field.
-# FIXME Broken by design. Events are broadcast to all monitors. If
-# another monitor's client has a command with the same ID in flight,
-# the event will incorrectly claim that command was dropped.
-#
-# @reason: The reason why the command is dropped.
-#
-# Since: 2.12
-#
-# Example:
-#
-# { "event": "COMMAND_DROPPED",
-# "data": {"result": {"id": "libvirt-102",
-# "reason": "queue-full" } } }
-#
-##
-{ 'event': 'COMMAND_DROPPED' ,
- 'data': { 'id': 'any', 'reason': 'CommandDropReason' } }
-
-##
# @set-numa-node:
#
# Runtime equivalent of '-numa' CLI option, available at
diff --git a/tests/libqtest.c b/tests/libqtest.c
index 75e07e16e7..43be078518 100644
--- a/tests/libqtest.c
+++ b/tests/libqtest.c
@@ -187,8 +187,7 @@ static const char *qtest_qemu_binary(void)
return qemu_bin;
}
-QTestState *qtest_init_without_qmp_handshake(bool use_oob,
- const char *extra_args)
+QTestState *qtest_init_without_qmp_handshake(const char *extra_args)
{
QTestState *s;
int sock, qmpsock, i;
@@ -219,12 +218,12 @@ QTestState *qtest_init_without_qmp_handshake(bool use_oob,
"-qtest unix:%s,nowait "
"-qtest-log %s "
"-chardev socket,path=%s,nowait,id=char0 "
- "-mon chardev=char0,mode=control%s "
+ "-mon chardev=char0,mode=control "
"-machine accel=qtest "
"-display none "
"%s", qemu_binary, socket_path,
getenv("QTEST_LOG") ? "/dev/fd/2" : "/dev/null",
- qmp_socket_path, use_oob ? ",x-oob=on" : "",
+ qmp_socket_path,
extra_args ?: "");
g_test_message("starting QEMU: %s", command);
@@ -266,7 +265,7 @@ QTestState *qtest_init_without_qmp_handshake(bool use_oob,
QTestState *qtest_init(const char *extra_args)
{
- QTestState *s = qtest_init_without_qmp_handshake(false, extra_args);
+ QTestState *s = qtest_init_without_qmp_handshake(extra_args);
QDict *greeting;
/* Read the QMP greeting and then do the handshake */
diff --git a/tests/libqtest.h b/tests/libqtest.h
index ed88ff99d5..96a6c01352 100644
--- a/tests/libqtest.h
+++ b/tests/libqtest.h
@@ -55,14 +55,12 @@ QTestState *qtest_init(const char *extra_args);
/**
* qtest_init_without_qmp_handshake:
- * @use_oob: true to have the server advertise OOB support
* @extra_args: other arguments to pass to QEMU. CAUTION: these
* arguments are subject to word splitting and shell evaluation.
*
* Returns: #QTestState instance.
*/
-QTestState *qtest_init_without_qmp_handshake(bool use_oob,
- const char *extra_args);
+QTestState *qtest_init_without_qmp_handshake(const char *extra_args);
/**
* qtest_quit:
diff --git a/tests/qmp-test.c b/tests/qmp-test.c
index 7517be4654..48a4fa791a 100644
--- a/tests/qmp-test.c
+++ b/tests/qmp-test.c
@@ -108,7 +108,7 @@ static void test_qmp_protocol(void)
QList *capabilities;
QTestState *qts;
- qts = qtest_init_without_qmp_handshake(false, common_args);
+ qts = qtest_init_without_qmp_handshake(common_args);
/* Test greeting */
resp = qtest_qmp_receive(qts);
@@ -116,7 +116,7 @@ static void test_qmp_protocol(void)
g_assert(q);
test_version(qdict_get(q, "version"));
capabilities = qdict_get_qlist(q, "capabilities");
- g_assert(capabilities && qlist_empty(capabilities));
+ g_assert(capabilities);
qobject_unref(resp);
/* Test valid command before handshake */
@@ -219,7 +219,7 @@ static void test_qmp_oob(void)
QList *capabilities;
QString *qstr;
- qts = qtest_init_without_qmp_handshake(true, common_args);
+ qts = qtest_init_without_qmp_handshake(common_args);
/* Check the greeting message. */
resp = qtest_qmp_receive(qts);
diff --git a/tests/test-qmp-cmds.c b/tests/test-qmp-cmds.c
index 4ab2b6e5ce..481cb069ca 100644
--- a/tests/test-qmp-cmds.c
+++ b/tests/test-qmp-cmds.c
@@ -126,6 +126,21 @@ static void test_dispatch_cmd(void)
qobject_unref(req);
}
+static void test_dispatch_cmd_oob(void)
+{
+ QDict *req = qdict_new();
+ QDict *resp;
+
+ qdict_put_str(req, "exec-oob", "test-flags-command");
+
+ resp = qmp_dispatch(&qmp_commands, QOBJECT(req), true);
+ assert(resp != NULL);
+ assert(!qdict_haskey(resp, "error"));
+
+ qobject_unref(resp);
+ qobject_unref(req);
+}
+
/* test commands that return an error due to invalid parameters */
static void test_dispatch_cmd_failure(void)
{
@@ -302,6 +317,7 @@ int main(int argc, char **argv)
g_test_init(&argc, &argv, NULL);
g_test_add_func("/qmp/dispatch_cmd", test_dispatch_cmd);
+ g_test_add_func("/qmp/dispatch_cmd_oob", test_dispatch_cmd_oob);
g_test_add_func("/qmp/dispatch_cmd_failure", test_dispatch_cmd_failure);
g_test_add_func("/qmp/dispatch_cmd_io", test_dispatch_cmd_io);
g_test_add_func("/qmp/dispatch_cmd_success_response",
diff --git a/vl.c b/vl.c
index a5ae5f23d2..2a8b2ee16d 100644
--- a/vl.c
+++ b/vl.c
@@ -2322,11 +2322,6 @@ static int mon_init_func(void *opaque, QemuOpts *opts, Error **errp)
if (qemu_opt_get_bool(opts, "pretty", 0))
flags |= MONITOR_USE_PRETTY;
- /* OOB is off by default */
- if (qemu_opt_get_bool(opts, "x-oob", 0)) {
- flags |= MONITOR_USE_OOB;
- }
-
chardev = qemu_opt_get(opts, "chardev");
if (!chardev) {
error_report("chardev is required");