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[PATCH v7 10/13] hmp: Add support for coroutine command handlers
From: |
Kevin Wolf |
Subject: |
[PATCH v7 10/13] hmp: Add support for coroutine command handlers |
Date: |
Wed, 9 Sep 2020 17:11:46 +0200 |
Often, QMP command handlers are not only called to handle QMP commands,
but also from a corresponding HMP command handler. In order to give them
a consistent environment, optionally run HMP command handlers in a
coroutine, too.
The implementation is a lot simpler than in QMP because for HMP, we
still block the VM while the coroutine is running.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
monitor/monitor-internal.h | 1 +
monitor/hmp.c | 37 ++++++++++++++++++++++++++++++++-----
2 files changed, 33 insertions(+), 5 deletions(-)
diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h
index b55d6df07f..ad2e64be13 100644
--- a/monitor/monitor-internal.h
+++ b/monitor/monitor-internal.h
@@ -74,6 +74,7 @@ typedef struct HMPCommand {
const char *help;
const char *flags; /* p=preconfig */
void (*cmd)(Monitor *mon, const QDict *qdict);
+ bool coroutine;
/*
* @sub_table is a list of 2nd level of commands. If it does not exist,
* cmd should be used. If it exists, sub_table[?].cmd should be
diff --git a/monitor/hmp.c b/monitor/hmp.c
index 4b66ca1cd6..b858b0dbde 100644
--- a/monitor/hmp.c
+++ b/monitor/hmp.c
@@ -1056,12 +1056,26 @@ fail:
return NULL;
}
+typedef struct HandleHmpCommandCo {
+ Monitor *mon;
+ const HMPCommand *cmd;
+ QDict *qdict;
+ bool done;
+} HandleHmpCommandCo;
+
+static void handle_hmp_command_co(void *opaque)
+{
+ HandleHmpCommandCo *data = opaque;
+ data->cmd->cmd(data->mon, data->qdict);
+ monitor_set_cur(qemu_coroutine_self(), NULL);
+ data->done = true;
+}
+
void handle_hmp_command(MonitorHMP *mon, const char *cmdline)
{
QDict *qdict;
const HMPCommand *cmd;
const char *cmd_start = cmdline;
- Monitor *old_mon;
trace_handle_hmp_command(mon, cmdline);
@@ -1080,10 +1094,23 @@ void handle_hmp_command(MonitorHMP *mon, const char
*cmdline)
return;
}
- /* old_mon is non-NULL when called from qmp_human_monitor_command() */
- old_mon = monitor_set_cur(qemu_coroutine_self(), &mon->common);
- cmd->cmd(&mon->common, qdict);
- monitor_set_cur(qemu_coroutine_self(), old_mon);
+ if (!cmd->coroutine) {
+ /* old_mon is non-NULL when called from qmp_human_monitor_command() */
+ Monitor *old_mon = monitor_set_cur(qemu_coroutine_self(),
&mon->common);
+ cmd->cmd(&mon->common, qdict);
+ monitor_set_cur(qemu_coroutine_self(), old_mon);
+ } else {
+ HandleHmpCommandCo data = {
+ .mon = &mon->common,
+ .cmd = cmd,
+ .qdict = qdict,
+ .done = false,
+ };
+ Coroutine *co = qemu_coroutine_create(handle_hmp_command_co, &data);
+ monitor_set_cur(co, &mon->common);
+ aio_co_enter(qemu_get_aio_context(), co);
+ AIO_WAIT_WHILE(qemu_get_aio_context(), !data.done);
+ }
qobject_unref(qdict);
}
--
2.25.4
[PATCH v7 11/13] util/async: Add aio_co_reschedule_self(), Kevin Wolf, 2020/09/09
[PATCH v7 10/13] hmp: Add support for coroutine command handlers,
Kevin Wolf <=
[PATCH v7 12/13] block: Add bdrv_co_move_to_aio_context(), Kevin Wolf, 2020/09/09
[PATCH v7 13/13] block: Convert 'block_resize' to coroutine, Kevin Wolf, 2020/09/09