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269e09f3fc
Introduces USER_CREATABLE interface that must be implemented by objects which are designed to created with -object CLI option or object-add QMP command. Interface provides an ability to do an optional second stage initialization of the object created with -object/object-add commands. By providing complete() callback, which is called after the object properties were set. It allows to: * prevents misusing of -object/object-add by filtering out objects that are not designed for it. * generalize second stage backend initialization instead of adding custom APIs to perform it * early error detection of backend initialization at -object/ object-add time rather than through a proxy DEVICE object that tries to use backend. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/*
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* QEMU Random Number Generator Backend
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "sysemu/rng.h"
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#include "qapi/qmp/qerror.h"
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#include "qom/object_interfaces.h"
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void rng_backend_request_entropy(RngBackend *s, size_t size,
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EntropyReceiveFunc *receive_entropy,
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void *opaque)
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{
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RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
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if (k->request_entropy) {
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k->request_entropy(s, size, receive_entropy, opaque);
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}
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}
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void rng_backend_cancel_requests(RngBackend *s)
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{
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RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
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if (k->cancel_requests) {
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k->cancel_requests(s);
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}
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}
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static bool rng_backend_prop_get_opened(Object *obj, Error **errp)
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{
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RngBackend *s = RNG_BACKEND(obj);
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return s->opened;
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}
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void rng_backend_open(RngBackend *s, Error **errp)
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{
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object_property_set_bool(OBJECT(s), true, "opened", errp);
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}
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static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp)
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{
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RngBackend *s = RNG_BACKEND(obj);
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RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
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if (value == s->opened) {
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return;
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}
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if (!value && s->opened) {
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error_set(errp, QERR_PERMISSION_DENIED);
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return;
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}
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if (k->opened) {
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k->opened(s, errp);
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}
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if (!error_is_set(errp)) {
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s->opened = value;
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}
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}
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static void rng_backend_init(Object *obj)
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{
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object_property_add_bool(obj, "opened",
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rng_backend_prop_get_opened,
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rng_backend_prop_set_opened,
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NULL);
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}
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static const TypeInfo rng_backend_info = {
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.name = TYPE_RNG_BACKEND,
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.parent = TYPE_OBJECT,
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.instance_size = sizeof(RngBackend),
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.instance_init = rng_backend_init,
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.class_size = sizeof(RngBackendClass),
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.abstract = true,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_USER_CREATABLE },
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{ }
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}
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};
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static void register_types(void)
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{
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type_register_static(&rng_backend_info);
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}
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type_init(register_types);
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