microvm/acpi: disable virtio-mmio cmdline hack
[qemu.git] / backends / rng-builtin.c
1 /*
2 * QEMU Builtin Random Number Generator Backend
3 *
4 * This work is licensed under the terms of the GNU GPL, version 2 or later.
5 * See the COPYING file in the top-level directory.
6 */
7
8 #include "qemu/osdep.h"
9 #include "sysemu/rng.h"
10 #include "qemu/main-loop.h"
11 #include "qemu/guest-random.h"
12 #include "qom/object.h"
13
14 typedef struct RngBuiltin RngBuiltin;
15 DECLARE_INSTANCE_CHECKER(RngBuiltin, RNG_BUILTIN,
16 TYPE_RNG_BUILTIN)
17
18 struct RngBuiltin {
19 RngBackend parent;
20 QEMUBH *bh;
21 };
22
23 static void rng_builtin_receive_entropy_bh(void *opaque)
24 {
25 RngBuiltin *s = opaque;
26
27 while (!QSIMPLEQ_EMPTY(&s->parent.requests)) {
28 RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests);
29
30 qemu_guest_getrandom_nofail(req->data, req->size);
31
32 req->receive_entropy(req->opaque, req->data, req->size);
33
34 rng_backend_finalize_request(&s->parent, req);
35 }
36 }
37
38 static void rng_builtin_request_entropy(RngBackend *b, RngRequest *req)
39 {
40 RngBuiltin *s = RNG_BUILTIN(b);
41
42 qemu_bh_schedule(s->bh);
43 }
44
45 static void rng_builtin_init(Object *obj)
46 {
47 RngBuiltin *s = RNG_BUILTIN(obj);
48
49 s->bh = qemu_bh_new(rng_builtin_receive_entropy_bh, s);
50 }
51
52 static void rng_builtin_finalize(Object *obj)
53 {
54 RngBuiltin *s = RNG_BUILTIN(obj);
55
56 qemu_bh_delete(s->bh);
57 }
58
59 static void rng_builtin_class_init(ObjectClass *klass, void *data)
60 {
61 RngBackendClass *rbc = RNG_BACKEND_CLASS(klass);
62
63 rbc->request_entropy = rng_builtin_request_entropy;
64 }
65
66 static const TypeInfo rng_builtin_info = {
67 .name = TYPE_RNG_BUILTIN,
68 .parent = TYPE_RNG_BACKEND,
69 .instance_size = sizeof(RngBuiltin),
70 .instance_init = rng_builtin_init,
71 .instance_finalize = rng_builtin_finalize,
72 .class_init = rng_builtin_class_init,
73 };
74
75 static void register_types(void)
76 {
77 type_register_static(&rng_builtin_info);
78 }
79
80 type_init(register_types);