cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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rng-builtin.c (1840B)

      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#include "sysemu/replay.h"
     14
     15OBJECT_DECLARE_SIMPLE_TYPE(RngBuiltin, RNG_BUILTIN)
     16
     17struct RngBuiltin {
     18    RngBackend parent;
     19    QEMUBH *bh;
     20};
     21
     22static 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
     37static void rng_builtin_request_entropy(RngBackend *b, RngRequest *req)
     38{
     39    RngBuiltin *s = RNG_BUILTIN(b);
     40
     41    replay_bh_schedule_event(s->bh);
     42}
     43
     44static 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
     51static void rng_builtin_finalize(Object *obj)
     52{
     53    RngBuiltin *s = RNG_BUILTIN(obj);
     54
     55    qemu_bh_delete(s->bh);
     56}
     57
     58static 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
     65static 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
     74static void register_types(void)
     75{
     76    type_register_static(&rng_builtin_info);
     77}
     78
     79type_init(register_types);