LXR qemu/accel/accel.c

   1/*
   2 * QEMU System Emulator, accelerator interfaces
   3 *
   4 * Copyright (c) 2003-2008 Fabrice Bellard
   5 * Copyright (c) 2014 Red Hat Inc.
   6 *
   7 * Permission is hereby granted, free of charge, to any person obtaining a copy
   8 * of this software and associated documentation files (the "Software"), to deal
   9 * in the Software without restriction, including without limitation the rights
  10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 * copies of the Software, and to permit persons to whom the Software is
  12 * furnished to do so, subject to the following conditions:
  13 *
  14 * The above copyright notice and this permission notice shall be included in
  15 * all copies or substantial portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23 * THE SOFTWARE.
  24 */
  25
  26#include "qemu/osdep.h"
  27#include "sysemu/accel.h"
  28#include "hw/boards.h"
  29#include "sysemu/arch_init.h"
  30#include "sysemu/sysemu.h"
  31#include "sysemu/kvm.h"
  32#include "sysemu/qtest.h"
  33#include "hw/xen/xen.h"
  34#include "qom/object.h"
  35#include "qemu/error-report.h"
  36#include "qemu/option.h"
  37
  38static const TypeInfo accel_type = {
  39    .name = TYPE_ACCEL,
  40    .parent = TYPE_OBJECT,
  41    .class_size = sizeof(AccelClass),
  42    .instance_size = sizeof(AccelState),
  43};
  44
  45/* Lookup AccelClass from opt_name. Returns NULL if not found */
  46static AccelClass *accel_find(const char *opt_name)
  47{
  48    char *class_name = g_strdup_printf(ACCEL_CLASS_NAME("%s"), opt_name);
  49    AccelClass *ac = ACCEL_CLASS(object_class_by_name(class_name));
  50    g_free(class_name);
  51    return ac;
  52}
  53
  54static int accel_init_machine(AccelClass *acc, MachineState *ms)
  55{
  56    ObjectClass *oc = OBJECT_CLASS(acc);
  57    const char *cname = object_class_get_name(oc);
  58    AccelState *accel = ACCEL(object_new(cname));
  59    int ret;
  60    ms->accelerator = accel;
  61    *(acc->allowed) = true;
  62    ret = acc->init_machine(ms);
  63    if (ret < 0) {
  64        ms->accelerator = NULL;
  65        *(acc->allowed) = false;
  66        object_unref(OBJECT(accel));
  67    }
  68    return ret;
  69}
  70
  71void configure_accelerator(MachineState *ms)
  72{
  73    const char *accel, *p;
  74    char buf[10];
  75    int ret;
  76    bool accel_initialised = false;
  77    bool init_failed = false;
  78    AccelClass *acc = NULL;
  79
  80    accel = qemu_opt_get(qemu_get_machine_opts(), "accel");
  81    if (accel == NULL) {
  82        /* Use the default "accelerator", tcg */
  83        accel = "tcg";
  84    }
  85
  86    p = accel;
  87    while (!accel_initialised && *p != '\0') {
  88        if (*p == ':') {
  89            p++;
  90        }
  91        p = get_opt_name(buf, sizeof(buf), p, ':');
  92        acc = accel_find(buf);
  93        if (!acc) {
  94            continue;
  95        }
  96        if (acc->available && !acc->available()) {
  97            printf("%s not supported for this target\n",
  98                   acc->name);
  99            continue;
 100        }
 101        ret = accel_init_machine(acc, ms);
 102        if (ret < 0) {
 103            init_failed = true;
 104            error_report("failed to initialize %s: %s",
 105                         acc->name, strerror(-ret));
 106        } else {
 107            accel_initialised = true;
 108        }
 109    }
 110
 111    if (!accel_initialised) {
 112        if (!init_failed) {
 113            error_report("-machine accel=%s: No accelerator found", accel);
 114        }
 115        exit(1);
 116    }
 117
 118    if (init_failed) {
 119        error_report("Back to %s accelerator", acc->name);
 120    }
 121}
 122
 123void accel_register_compat_props(AccelState *accel)
 124{
 125    AccelClass *class = ACCEL_GET_CLASS(accel);
 126    register_compat_props_array(class->global_props);
 127}
 128
 129static void register_accel_types(void)
 130{
 131    type_register_static(&accel_type);
 132}
 133
 134type_init(register_accel_types);
 135