cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

dummy-cpus.c (1797B)

      1/*
      2 * Dummy cpu thread code
      3 *
      4 * Copyright IBM, Corp. 2011
      5 *
      6 * Authors:
      7 *  Anthony Liguori   <aliguori@us.ibm.com>
      8 *
      9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
     10 * See the COPYING file in the top-level directory.
     11 *
     12 */
     13
     14#include "qemu/osdep.h"
     15#include "qemu/rcu.h"
     16#include "sysemu/cpus.h"
     17#include "qemu/guest-random.h"
     18#include "qemu/main-loop.h"
     19#include "hw/core/cpu.h"
     20
     21static void *dummy_cpu_thread_fn(void *arg)
     22{
     23    CPUState *cpu = arg;
     24    sigset_t waitset;
     25    int r;
     26
     27    rcu_register_thread();
     28
     29    qemu_mutex_lock_iothread();
     30    qemu_thread_get_self(cpu->thread);
     31    cpu->thread_id = qemu_get_thread_id();
     32    cpu->can_do_io = 1;
     33    current_cpu = cpu;
     34
     35    sigemptyset(&waitset);
     36    sigaddset(&waitset, SIG_IPI);
     37
     38    /* signal CPU creation */
     39    cpu_thread_signal_created(cpu);
     40    qemu_guest_random_seed_thread_part2(cpu->random_seed);
     41
     42    do {
     43        qemu_mutex_unlock_iothread();
     44        do {
     45            int sig;
     46            r = sigwait(&waitset, &sig);
     47        } while (r == -1 && (errno == EAGAIN || errno == EINTR));
     48        if (r == -1) {
     49            perror("sigwait");
     50            exit(1);
     51        }
     52        qemu_mutex_lock_iothread();
     53        qemu_wait_io_event(cpu);
     54    } while (!cpu->unplug);
     55
     56    qemu_mutex_unlock_iothread();
     57    rcu_unregister_thread();
     58    return NULL;
     59}
     60
     61void dummy_start_vcpu_thread(CPUState *cpu)
     62{
     63    char thread_name[VCPU_THREAD_NAME_SIZE];
     64
     65    cpu->thread = g_malloc0(sizeof(QemuThread));
     66    cpu->halt_cond = g_malloc0(sizeof(QemuCond));
     67    qemu_cond_init(cpu->halt_cond);
     68    snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
     69             cpu->cpu_index);
     70    qemu_thread_create(cpu->thread, thread_name, dummy_cpu_thread_fn, cpu,
     71                       QEMU_THREAD_JOINABLE);
     72}