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#include "qapi/error.h"
  38
  39static const TypeInfo accel_type = {
  40    .name = TYPE_ACCEL,
  41    .parent = TYPE_OBJECT,
  42    .class_size = sizeof(AccelClass),
  43    .instance_size = sizeof(AccelState),
  44};
  45
  46/* Lookup AccelClass from opt_name. Returns NULL if not found */
  47static AccelClass *accel_find(const char *opt_name)
  48{
  49    char *class_name = g_strdup_printf(ACCEL_CLASS_NAME("%s"), opt_name);
  50    AccelClass *ac = ACCEL_CLASS(object_class_by_name(class_name));
  51    g_free(class_name);
  52    return ac;
  53}
  54
  55static int accel_init_machine(AccelClass *acc, MachineState *ms)
  56{
  57    ObjectClass *oc = OBJECT_CLASS(acc);
  58    const char *cname = object_class_get_name(oc);
  59    AccelState *accel = ACCEL(object_new(cname));
  60    int ret;
  61    ms->accelerator = accel;
  62    *(acc->allowed) = true;
  63    ret = acc->init_machine(ms);
  64    if (ret < 0) {
  65        ms->accelerator = NULL;
  66        *(acc->allowed) = false;
  67        object_unref(OBJECT(accel));
  68    } else {
  69        object_set_accelerator_compat_props(acc->compat_props);
  70    }
  71    return ret;
  72}
  73
  74void configure_accelerator(MachineState *ms, const char *progname)
  75{
  76    const char *accel;
  77    char **accel_list, **tmp;
  78    int ret;
  79    bool accel_initialised = false;
  80    bool init_failed = false;
  81    AccelClass *acc = NULL;
  82
  83    accel = qemu_opt_get(qemu_get_machine_opts(), "accel");
  84    if (accel == NULL) {
  85        /* Select the default accelerator */
  86        int pnlen = strlen(progname);
  87        if (pnlen >= 3 && g_str_equal(&progname[pnlen - 3], "kvm")) {
  88            /* If the program name ends with "kvm", we prefer KVM */
  89            accel = "kvm:tcg";
  90        } else {
  91#if defined(CONFIG_TCG)
  92            accel = "tcg";
  93#elif defined(CONFIG_KVM)
  94            accel = "kvm";
  95#else
  96            error_report("No accelerator selected and"
  97                         " no default accelerator available");
  98            exit(1);
  99#endif
 100        }
 101    }
 102
 103    accel_list = g_strsplit(accel, ":", 0);
 104
 105    for (tmp = accel_list; !accel_initialised && tmp && *tmp; tmp++) {
 106        acc = accel_find(*tmp);
 107        if (!acc) {
 108            continue;
 109        }
 110        ret = accel_init_machine(acc, ms);
 111        if (ret < 0) {
 112            init_failed = true;
 113            error_report("failed to initialize %s: %s",
 114                         acc->name, strerror(-ret));
 115        } else {
 116            accel_initialised = true;
 117        }
 118    }
 119    g_strfreev(accel_list);
 120
 121    if (!accel_initialised) {
 122        if (!init_failed) {
 123            error_report("-machine accel=%s: No accelerator found", accel);
 124        }
 125        exit(1);
 126    }
 127
 128    if (init_failed) {
 129        error_report("Back to %s accelerator", acc->name);
 130    }
 131}
 132
 133void accel_setup_post(MachineState *ms)
 134{
 135    AccelState *accel = ms->accelerator;
 136    AccelClass *acc = ACCEL_GET_CLASS(accel);
 137    if (acc->setup_post) {
 138        acc->setup_post(ms, accel);
 139    }
 140}
 141
 142static void register_accel_types(void)
 143{
 144    type_register_static(&accel_type);
 145}
 146
 147type_init(register_accel_types);
 148