Laurent Vivier | 6c4e9d4 | 2019-08-20 18:06:13 +0200 | [diff] [blame] | 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" |
Eduardo Habkost | db1015e | 2020-09-03 16:43:22 -0400 | [diff] [blame] | 12 | #include "qom/object.h" |
Pavel Dovgalyuk | 54550d8 | 2021-02-03 09:00:12 +0300 | [diff] [blame] | 13 | #include "sysemu/replay.h" |
Laurent Vivier | 6c4e9d4 | 2019-08-20 18:06:13 +0200 | [diff] [blame] | 14 | |
Eduardo Habkost | 8063396 | 2020-09-16 14:25:19 -0400 | [diff] [blame] | 15 | OBJECT_DECLARE_SIMPLE_TYPE(RngBuiltin, RNG_BUILTIN) |
Laurent Vivier | 6c4e9d4 | 2019-08-20 18:06:13 +0200 | [diff] [blame] | 16 | |
Eduardo Habkost | db1015e | 2020-09-03 16:43:22 -0400 | [diff] [blame] | 17 | struct RngBuiltin { |
Laurent Vivier | 6c4e9d4 | 2019-08-20 18:06:13 +0200 | [diff] [blame] | 18 | RngBackend parent; |
| 19 | QEMUBH *bh; |
Eduardo Habkost | db1015e | 2020-09-03 16:43:22 -0400 | [diff] [blame] | 20 | }; |
Laurent Vivier | 6c4e9d4 | 2019-08-20 18:06:13 +0200 | [diff] [blame] | 21 | |
| 22 | static void rng_builtin_receive_entropy_bh(void *opaque) |
| 23 | { |
| 24 | RngBuiltin *s = opaque; |
| 25 | |
| 26 | while (!QSIMPLEQ_EMPTY(&s->parent.requests)) { |
| 27 | RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests); |
| 28 | |
| 29 | qemu_guest_getrandom_nofail(req->data, req->size); |
| 30 | |
| 31 | req->receive_entropy(req->opaque, req->data, req->size); |
| 32 | |
| 33 | rng_backend_finalize_request(&s->parent, req); |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | static void rng_builtin_request_entropy(RngBackend *b, RngRequest *req) |
| 38 | { |
| 39 | RngBuiltin *s = RNG_BUILTIN(b); |
| 40 | |
Pavel Dovgalyuk | 54550d8 | 2021-02-03 09:00:12 +0300 | [diff] [blame] | 41 | replay_bh_schedule_event(s->bh); |
Laurent Vivier | 6c4e9d4 | 2019-08-20 18:06:13 +0200 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | static void rng_builtin_init(Object *obj) |
| 45 | { |
| 46 | RngBuiltin *s = RNG_BUILTIN(obj); |
| 47 | |
| 48 | s->bh = qemu_bh_new(rng_builtin_receive_entropy_bh, s); |
| 49 | } |
| 50 | |
| 51 | static void rng_builtin_finalize(Object *obj) |
| 52 | { |
| 53 | RngBuiltin *s = RNG_BUILTIN(obj); |
| 54 | |
| 55 | qemu_bh_delete(s->bh); |
| 56 | } |
| 57 | |
| 58 | static void rng_builtin_class_init(ObjectClass *klass, void *data) |
| 59 | { |
| 60 | RngBackendClass *rbc = RNG_BACKEND_CLASS(klass); |
| 61 | |
| 62 | rbc->request_entropy = rng_builtin_request_entropy; |
| 63 | } |
| 64 | |
| 65 | static const TypeInfo rng_builtin_info = { |
| 66 | .name = TYPE_RNG_BUILTIN, |
| 67 | .parent = TYPE_RNG_BACKEND, |
| 68 | .instance_size = sizeof(RngBuiltin), |
| 69 | .instance_init = rng_builtin_init, |
| 70 | .instance_finalize = rng_builtin_finalize, |
| 71 | .class_init = rng_builtin_class_init, |
| 72 | }; |
| 73 | |
| 74 | static void register_types(void) |
| 75 | { |
| 76 | type_register_static(&rng_builtin_info); |
| 77 | } |
| 78 | |
| 79 | type_init(register_types); |