From eb6e8ea5c38b47a3c6cf27f4780abd92bc079caa Mon Sep 17 00:00:00 2001 From: Anthony Liguori Date: Mon, 12 Dec 2011 14:29:35 -0600 Subject: [PATCH] qom: qom_{get, set} monitor commands (v2) This allows clients to read and write device model properties through QMP. QAPI doesn't support Visitor types yet and these commands are special in that they don't work with fixed types. I've added a documentation stub to qapi-schema.json so we can keep consistency there. Signed-off-by: Anthony Liguori --- monitor.h | 4 +++ qapi-schema.json | 59 +++++++++++++++++++++++++++++++++++++++++++ qmp-commands.hx | 12 +++++++++ qmp.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 140 insertions(+) diff --git a/monitor.h b/monitor.h index 052f1cb24..cfa2f679f 100644 --- a/monitor.h +++ b/monitor.h @@ -67,4 +67,8 @@ typedef void (MonitorCompletion)(void *opaque, QObject *ret_data); void monitor_set_error(Monitor *mon, QError *qerror); +int qmp_qom_set(Monitor *mon, const QDict *qdict, QObject **ret); + +int qmp_qom_get(Monitor *mon, const QDict *qdict, QObject **ret); + #endif /* !MONITOR_H */ diff --git a/qapi-schema.json b/qapi-schema.json index 7c979b292..44cf764ec 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -1216,3 +1216,62 @@ { 'command': 'qom-list', 'data': { 'path': 'str' }, 'returns': [ 'DevicePropertyInfo' ] } + +## +# @qom-get: +# +# This command will get a property from a device model path and return the +# value. +# +# @path: The path within the device model. There are two forms of supported +# paths--absolute and partial paths. +# +# Absolute paths are derived from the root device and can follow child<> +# or link<> properties. Since they can follow link<> properties, they +# can be arbitrarily long. Absolute paths look like absolute filenames +# and are prefixed with a leading slash. +# +# Partial paths look like relative filenames. They do not begin +# with a prefix. The matching rules for partial paths are subtle but +# designed to make specifying devices easy. At each level of the +# composition tree, the partial path is matched as an absolute path. +# The first match is not returned. At least two matches are searched +# for. A successful result is only returned if only one match is +# found. If more than one match is found, a flag is return to +# indicate that the match was ambiguous. +# +# @property: The property name to read +# +# Returns: The property value. The type depends on the property type. legacy<> +# properties are returned as #str. child<> and link<> properties are +# returns as #str pathnames. All integer property types (u8, u16, etc) +# are returned as #int. +# +# Since: 1.1 +# +# Notes: This command is experimental and may change syntax in future releases. +## +{ 'command': 'qom-get', + 'data': { 'path': 'str', 'property': 'str' }, + 'returns': 'visitor', + 'gen': 'no' } + +## +# @qom-set: +# +# This command will set a property from a device model path. +# +# @path: see @qom-get for a description of this parameter +# +# @property: the property name to set +# +# @value: a value who's type is appropriate for the property type. See @qom-get +# for a description of type mapping. +# +# Since: 1.1 +# +# Notes: This command is experimental and may change syntax in future releases. +## +{ 'command': 'qom-set', + 'data': { 'path': 'str', 'property': 'str', 'value': 'visitor' }, + 'gen': 'no' } diff --git a/qmp-commands.hx b/qmp-commands.hx index c1f0718ef..7e3f4b9a5 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -2015,3 +2015,15 @@ EQMP .args_type = "path:s", .mhandler.cmd_new = qmp_marshal_input_qom_list, }, + + { + .name = "qom-set", + .args_type = "path:s,property:s,opts:O", + .mhandler.cmd_new = qmp_qom_set, + }, + + { + .name = "qom-get", + .args_type = "path:s,property:s", + .mhandler.cmd_new = qmp_qom_get, + }, diff --git a/qmp.c b/qmp.c index 8e9a59539..5e09b4189 100644 --- a/qmp.c +++ b/qmp.c @@ -17,6 +17,8 @@ #include "kvm.h" #include "arch_init.h" #include "hw/qdev.h" +#include "qapi/qmp-input-visitor.h" +#include "qapi/qmp-output-visitor.h" NameInfo *qmp_query_name(Error **errp) { @@ -182,3 +184,66 @@ DevicePropertyInfoList *qmp_qom_list(const char *path, Error **errp) return props; } + +/* FIXME: teach qapi about how to pass through Visitors */ +int qmp_qom_set(Monitor *mon, const QDict *qdict, QObject **ret) +{ + const char *path = qdict_get_str(qdict, "path"); + const char *property = qdict_get_str(qdict, "property"); + QObject *value = qdict_get(qdict, "value"); + Error *local_err = NULL; + QmpInputVisitor *mi; + DeviceState *dev; + + dev = qdev_resolve_path(path, NULL); + if (!dev) { + error_set(&local_err, QERR_DEVICE_NOT_FOUND, path); + goto out; + } + + mi = qmp_input_visitor_new(value); + qdev_property_set(dev, qmp_input_get_visitor(mi), property, &local_err); + + qmp_input_visitor_cleanup(mi); + +out: + if (local_err) { + qerror_report_err(local_err); + error_free(local_err); + return -1; + } + + return 0; +} + +int qmp_qom_get(Monitor *mon, const QDict *qdict, QObject **ret) +{ + const char *path = qdict_get_str(qdict, "path"); + const char *property = qdict_get_str(qdict, "property"); + Error *local_err = NULL; + QmpOutputVisitor *mo; + DeviceState *dev; + + dev = qdev_resolve_path(path, NULL); + if (!dev) { + error_set(&local_err, QERR_DEVICE_NOT_FOUND, path); + goto out; + } + + mo = qmp_output_visitor_new(); + qdev_property_get(dev, qmp_output_get_visitor(mo), property, &local_err); + if (!local_err) { + *ret = qmp_output_get_qobject(mo); + } + + qmp_output_visitor_cleanup(mo); + +out: + if (local_err) { + qerror_report_err(local_err); + error_free(local_err); + return -1; + } + + return 0; +} -- 2.39.2