Commit f1a1a356 authored by Gerd Hoffmann's avatar Gerd Hoffmann
Browse files

chardev: add qmp hotplug commands, with null chardev support



Add chardev-add and chardev-remove qmp commands.  Hotplugging
a null chardev is supported for now, more will be added later.
Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
parent e551498e
......@@ -3017,3 +3017,52 @@
# Since: 1.3.0
##
{ 'command': 'nbd-server-stop' }
##
# @ChardevBackend:
#
# Configuration info for the new chardev backend.
#
# Since: 1.4
##
{ 'type': 'ChardevDummy', 'data': { } }
{ 'union': 'ChardevBackend', 'data': { 'null' : 'ChardevDummy' } }
##
# @ChardevReturn:
#
# Return info about the chardev backend just created.
#
# Since: 1.4
##
{ 'type' : 'ChardevReturn', 'data': { } }
##
# @chardev-add:
#
# Add a file chardev
#
# @id: the chardev's ID, must be unique
# @backend: backend type and parameters
#
# Returns: chardev info.
#
# Since: 1.4
##
{ 'command': 'chardev-add', 'data': {'id' : 'str',
'backend' : 'ChardevBackend' },
'returns': 'ChardevReturn' }
##
# @chardev-remove:
#
# Remove a chardev
#
# @id: the chardev's ID, must exist and not be in use
#
# Returns: Nothing on success
#
# Since: 1.4
##
{ 'command': 'chardev-remove', 'data': {'id': 'str'} }
......@@ -3010,3 +3010,56 @@ QemuOptsList qemu_chardev_opts = {
{ /* end of list */ }
},
};
ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
Error **errp)
{
ChardevReturn *ret = g_new0(ChardevReturn, 1);
CharDriverState *chr = NULL;
chr = qemu_chr_find(id);
if (chr) {
error_setg(errp, "Chardev '%s' already exists", id);
g_free(ret);
return NULL;
}
switch (backend->kind) {
case CHARDEV_BACKEND_KIND_NULL:
chr = qemu_chr_open_null(NULL);
break;
default:
error_setg(errp, "unknown chardev backend (%d)", backend->kind);
break;
}
if (chr == NULL && !error_is_set(errp)) {
error_setg(errp, "Failed to create chardev");
}
if (chr) {
chr->label = g_strdup(id);
chr->avail_connections = 1;
QTAILQ_INSERT_TAIL(&chardevs, chr, next);
return ret;
} else {
g_free(ret);
return NULL;
}
}
void qmp_chardev_remove(const char *id, Error **errp)
{
CharDriverState *chr;
chr = qemu_chr_find(id);
if (NULL == chr) {
error_setg(errp, "Chardev '%s' not found", id);
return;
}
if (chr->chr_can_read || chr->chr_read ||
chr->chr_event || chr->handler_opaque) {
error_setg(errp, "Chardev '%s' is busy", id);
return;
}
qemu_chr_delete(chr);
}
......@@ -2654,3 +2654,53 @@ EQMP
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_target,
},
{
.name = "chardev-add",
.args_type = "id:s,backend:q",
.mhandler.cmd_new = qmp_marshal_input_chardev_add,
},
SQMP
chardev-add
----------------
Add a chardev.
Arguments:
- "id": the chardev's ID, must be unique (json-string)
- "backend": chardev backend type + parameters
Example:
-> { "execute" : "chardev-add",
"arguments" : { "id" : "foo",
"backend" : { "type" : "null", "data" : {} } } }
<- { "return": {} }
EQMP
{
.name = "chardev-remove",
.args_type = "id:s",
.mhandler.cmd_new = qmp_marshal_input_chardev_remove,
},
SQMP
chardev-remove
--------------
Remove a chardev.
Arguments:
- "id": the chardev's ID, must exist and not be in use (json-string)
Example:
-> { "execute": "chardev-remove", "arguments": { "id" : "foo" } }
<- { "return": {} }
EQMP
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment