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qemu-storage-daemon: Add --monitor option

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This adds and parses the --monitor option, so that a QMP monitor can be
used in the storage daemon. The monitor offers commands defined in the
QAPI schema at storage-daemon/qapi/qapi-schema.json.

The --monitor options currently allows to create multiple monitors with
the same ID. This part of the interface is considered unstable. We will
reject such configurations as soon as we have a design for the monitor
subsystem to perform these checks. (In the system emulator, we depend on
QemuOpts rejecting duplicate IDs.)

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200224143008.13362-21-kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2020-02-24 15:30:08 +01:00
parent a2f411c467
commit 2af282ec51
10 changed files with 121 additions and 5 deletions
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47
qemu-storage-daemon.c
View file

@ -31,13 +31,15 @@
#include "block/nbd.h"
#include "chardev/char.h"
#include "crypto/init.h"
#include "monitor/monitor.h"
#include "monitor/monitor-internal.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-block.h"
#include "qapi/qapi-commands-block-core.h"
#include "qapi/qapi-visit-block.h"
#include "qapi/qapi-visit-block-core.h"
#include "qapi/qapi-visit-control.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qstring.h"
#include "qapi/qobject-input-visitor.h"
#include "qemu-common.h"
@ -51,6 +53,9 @@
#include "qemu/option.h"
#include "qom/object_interfaces.h"
#include "storage-daemon/qapi/qapi-commands.h"
#include "storage-daemon/qapi/qapi-init-commands.h"
#include "sysemu/runstate.h"
#include "trace/control.h"
@ -61,6 +66,11 @@ void qemu_system_killed(int signal, pid_t pid)
exit_requested = true;
}
void qmp_quit(Error **errp)
{
exit_requested = true;
}
static void help(void)
{
printf(
@ -87,6 +97,9 @@ static void help(void)
" export the specified block node over NBD\n"
" (requires --nbd-server)\n"
"\n"
" --monitor [chardev=]name[,mode=control][,pretty[=on|off]]\n"
" configure a QMP monitor\n"
"\n"
" --nbd-server addr.type=inet,addr.host=<host>,addr.port=<port>\n"
" [,tls-creds=<id>][,tls-authz=<id>]\n"
" --nbd-server addr.type=unix,addr.path=<path>\n"
@ -110,6 +123,7 @@ enum {
OPTION_BLOCKDEV = 256,
OPTION_CHARDEV,
OPTION_EXPORT,
OPTION_MONITOR,
OPTION_NBD_SERVER,
OPTION_OBJECT,
};
@ -125,6 +139,17 @@ static QemuOptsList qemu_object_opts = {
},
};
static void init_qmp_commands(void)
{
qmp_init_marshal(&qmp_commands);
qmp_register_command(&qmp_commands, "query-qmp-schema",
qmp_query_qmp_schema, QCO_ALLOW_PRECONFIG);
QTAILQ_INIT(&qmp_cap_negotiation_commands);
qmp_register_command(&qmp_cap_negotiation_commands, "qmp_capabilities",
qmp_marshal_qmp_capabilities, QCO_ALLOW_PRECONFIG);
}
static void init_export(BlockExport *export, Error **errp)
{
switch (export->type) {
@ -145,6 +170,7 @@ static void process_options(int argc, char *argv[])
{"chardev", required_argument, NULL, OPTION_CHARDEV},
{"export", required_argument, NULL, OPTION_EXPORT},
{"help", no_argument, NULL, 'h'},
{"monitor", required_argument, NULL, OPTION_MONITOR},
{"nbd-server", required_argument, NULL, OPTION_NBD_SERVER},
{"object", required_argument, NULL, OPTION_OBJECT},
{"trace", required_argument, NULL, 'T'},
@ -219,6 +245,21 @@ static void process_options(int argc, char *argv[])
qapi_free_BlockExport(export);
break;
}
case OPTION_MONITOR:
{
Visitor *v;
MonitorOptions *monitor;
v = qobject_input_visitor_new_str(optarg, "chardev",
&error_fatal);
visit_type_MonitorOptions(v, NULL, &monitor, &error_fatal);
visit_free(v);
/* TODO Catch duplicate monitor IDs */
monitor_init(monitor, false, &error_fatal);
qapi_free_MonitorOptions(monitor);
break;
}
case OPTION_NBD_SERVER:
{
Visitor *v;
@ -280,6 +321,8 @@ int main(int argc, char *argv[])
qemu_add_opts(&qemu_trace_opts);
qcrypto_init(&error_fatal);
bdrv_init();
monitor_init_globals_core();
init_qmp_commands();
if (!trace_init_backends()) {
return EXIT_FAILURE;