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Re: [Qemu-devel] [PATCH qemu v3 2/2] qmp: Add qom-list-properties to lis
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [PATCH qemu v3 2/2] qmp: Add qom-list-properties to list QOM object properties |
Date: |
Fri, 2 Mar 2018 13:05:45 +1100 |
User-agent: |
Mutt/1.9.2 (2017-12-15) |
On Fri, Mar 02, 2018 at 12:09:39AM +1100, Alexey Kardashevskiy wrote:
> There is already 'device-list-properties' which does most of the job,
> however it does not handle everything returned by qom-list-types such
> as machines as they inherit directly from TYPE_OBJECT and not TYPE_DEVICE.
> It does not handle abstract classes either.
>
> This adds a new qom-list-properties command which prints properties
> of a specific class and its instance. It is pretty much a simplified copy
> of the device-list-properties handler.
>
> Since it creates an object instance, device properties should appear
> in the output as they are copied to QOM properties at the instance_init
> hook.
>
> This adds a object_class_property_iter_init() helper to allow class
> properties enumeration uses it in the new QMP command to allow properties
> listing for abstract classes.
>
> Signed-off-by: Alexey Kardashevskiy <address@hidden>
> ---
> Changes:
> v3:
> * Used ObjectPropertyInfo instead of QOMPropertyInfo
>
> v2:
> * added abstract classes support, now things like "pci-device" or
> "spapr-machine" show properties, previously these would produce
> an "abstract class" error
>
> # Conflicts:
> # qapi-schema.json
> ---
> qapi-schema.json | 15 +++++++++++++++
> include/qom/object.h | 16 ++++++++++++++++
> qmp.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
> qom/object.c | 7 +++++++
> 4 files changed, 87 insertions(+)
>
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 87327e5..32e836f 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -1442,6 +1442,21 @@
> 'returns': [ 'ObjectPropertyInfo' ] }
>
> ##
> +# @qom-list-properties:
> +#
> +# List properties associated with a QOM object.
> +#
> +# @typename: the type name of an object
> +#
> +# Returns: a list of ObjectPropertyInfo describing object properties
> +#
> +# Since: 2.12
> +##
> +{ 'command': 'qom-list-properties',
> + 'data': { 'typename': 'str'},
> + 'returns': [ 'ObjectPropertyInfo' ] }
> +
> +##
> # @xen-set-global-dirty-log:
> #
> # Enable or disable the global dirty log mode.
> diff --git a/include/qom/object.h b/include/qom/object.h
> index dc73d59..ef07d78 100644
> --- a/include/qom/object.h
> +++ b/include/qom/object.h
> @@ -1017,6 +1017,22 @@ void object_property_iter_init(ObjectPropertyIterator
> *iter,
> Object *obj);
>
> /**
> + * object_class_property_iter_init:
> + * @klass: the class
> + *
> + * Initializes an iterator for traversing all properties
> + * registered against an object class and all parent classes.
> + *
> + * It is forbidden to modify the property list while iterating,
> + * whether removing or adding properties.
> + *
> + * This can be used on abstract classes as it does not create a temporary
> + * instance.
> + */
> +void object_class_property_iter_init(ObjectPropertyIterator *iter,
> + ObjectClass *klass);
> +
> +/**
> * object_property_iter_next:
> * @iter: the iterator instance
> *
> diff --git a/qmp.c b/qmp.c
> index 8a74038..1f15f68 100644
> --- a/qmp.c
> +++ b/qmp.c
> @@ -576,6 +576,55 @@ ObjectPropertyInfoList *qmp_device_list_properties(const
> char *typename,
> return prop_list;
> }
>
> +ObjectPropertyInfoList *qmp_qom_list_properties(const char *typename,
> + Error **errp)
> +{
> + ObjectClass *klass;
> + Object *obj = NULL;
> + ObjectProperty *prop;
> + ObjectPropertyIterator iter;
> + ObjectPropertyInfoList *prop_list = NULL;
> +
> + klass = object_class_by_name(typename);
> + if (klass == NULL) {
> + error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
> + "Class '%s' not found", typename);
> + return NULL;
> + }
> +
> + klass = object_class_dynamic_cast(klass, TYPE_OBJECT);
> + if (klass == NULL) {
> + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "typename",
> TYPE_OBJECT);
> + return NULL;
> + }
> +
> + if (object_class_is_abstract(klass)) {
> + object_class_property_iter_init(&iter, klass);
I remain a bit concerned about the subtle difference in behaviour
between abstract and non-abstract classes.
> + } else {
> + obj = object_new(typename);
> + object_property_iter_init(&iter, obj);
> + }
> + while ((prop = object_property_iter_next(&iter))) {
> + ObjectPropertyInfo *info;
> + ObjectPropertyInfoList *entry;
> +
> + info = g_malloc0(sizeof(*info));
> + info->name = g_strdup(prop->name);
> + info->type = g_strdup(prop->type);
> + info->has_description = !!prop->description;
> + info->description = g_strdup(prop->description);
> +
> + entry = g_malloc0(sizeof(*entry));
> + entry->value = info;
> + entry->next = prop_list;
> + prop_list = entry;
> + }
> +
> + object_unref(obj);
> +
> + return prop_list;
> +}
> +
> CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
> {
> return arch_query_cpu_definitions(errp);
> diff --git a/qom/object.c b/qom/object.c
> index 5dcee46..e7978bd 100644
> --- a/qom/object.c
> +++ b/qom/object.c
> @@ -1037,6 +1037,13 @@ ObjectProperty
> *object_property_iter_next(ObjectPropertyIterator *iter)
> return val;
> }
>
> +void object_class_property_iter_init(ObjectPropertyIterator *iter,
> + ObjectClass *klass)
> +{
> + g_hash_table_iter_init(&iter->iter, klass->properties);
> + iter->nextclass = klass;
> +}
> +
> ObjectProperty *object_class_property_find(ObjectClass *klass, const char
> *name,
> Error **errp)
> {
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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