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 "sysemu/accel.h"
  27 #include "qemu-common.h"
  28 #include "sysemu/arch_init.h"
  29 #include "sysemu/sysemu.h"
  30 #include "sysemu/kvm.h"
  31 #include "sysemu/qtest.h"
  32 #include "hw/xen/xen.h"
  33 #include "qom/object.h"
  34
  35 int tcg_tb_size;
  36 static bool tcg_allowed = true;
  37
  38 static int tcg_init(MachineClass *mc)
  39 {
  40     tcg_exec_init(tcg_tb_size * 1024 * 1024);
  41     return 0;
  42 }
  43
  44 static const TypeInfo accel_type = {
  45     .name = TYPE_ACCEL,
  46     .parent = TYPE_OBJECT,
  47     .class_size = sizeof(AccelClass),
  48     .instance_size = sizeof(AccelState),
  49 };
  50
  51 /* Lookup AccelClass from opt_name. Returns NULL if not found */
  52 static AccelClass *accel_find(const char *opt_name)
  53 {
  54     char *class_name = g_strdup_printf(ACCEL_CLASS_NAME("%s"), opt_name);
  55     AccelClass *ac = ACCEL_CLASS(object_class_by_name(class_name));
  56     g_free(class_name);
  57     return ac;
  58 }
  59
  60 int configure_accelerator(MachineClass *mc)
  61 {
  62     const char *p;
  63     char buf[10];
  64     int ret;
  65     bool accel_initialised = false;
  66     bool init_failed = false;
  67     AccelClass *acc = NULL;
  68
  69     p = qemu_opt_get(qemu_get_machine_opts(), "accel");
  70     if (p == NULL) {
  71         /* Use the default "accelerator", tcg */
  72         p = "tcg";
  73     }
  74
  75     while (!accel_initialised && *p != '\0') {
  76         if (*p == ':') {
  77             p++;
  78         }
  79         p = get_opt_name(buf, sizeof(buf), p, ':');
  80         acc = accel_find(buf);
  81         if (!acc) {
  82             fprintf(stderr, "\"%s\" accelerator not found.\n", buf);
  83             continue;
  84         }
  85         if (acc->available && !acc->available()) {
  86             printf("%s not supported for this target\n",
  87                    acc->name);
  88             continue;
  89         }
  90         *(acc->allowed) = true;
  91         ret = acc->init(mc);
  92         if (ret < 0) {
  93             init_failed = true;
  94             fprintf(stderr, "failed to initialize %s: %s\n",
  95                     acc->name,
  96                     strerror(-ret));
  97             *(acc->allowed) = false;
  98         } else {
  99             accel_initialised = true;
 100         }
 101     }
 102
 103     if (!accel_initialised) {
 104         if (!init_failed) {
 105             fprintf(stderr, "No accelerator found!\n");
 106         }
 107         exit(1);
 108     }
 109
 110     if (init_failed) {
 111         fprintf(stderr, "Back to %s accelerator.\n", acc->name);
 112     }
 113
 114     return !accel_initialised;
 115 }
 116
 117
 118 static void tcg_accel_class_init(ObjectClass *oc, void *data)
 119 {
 120     AccelClass *ac = ACCEL_CLASS(oc);
 121     ac->name = "tcg";
 122     ac->available = tcg_available;
 123     ac->init = tcg_init;
 124     ac->allowed = &tcg_allowed;
 125 }
 126
 127 #define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
 128
 129 static const TypeInfo tcg_accel_type = {
 130     .name = TYPE_TCG_ACCEL,
 131     .parent = TYPE_ACCEL,
 132     .class_init = tcg_accel_class_init,
 133 };
 134
 135 static void xen_accel_class_init(ObjectClass *oc, void *data)
 136 {
 137     AccelClass *ac = ACCEL_CLASS(oc);
 138     ac->name = "Xen";
 139     ac->available = xen_available;
 140     ac->init = xen_init;
 141     ac->allowed = &xen_allowed;
 142 }
 143
 144 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 145
 146 static const TypeInfo xen_accel_type = {
 147     .name = TYPE_XEN_ACCEL,
 148     .parent = TYPE_ACCEL,
 149     .class_init = xen_accel_class_init,
 150 };
 151
 152 static void qtest_accel_class_init(ObjectClass *oc, void *data)
 153 {
 154     AccelClass *ac = ACCEL_CLASS(oc);
 155     ac->name = "QTest";
 156     ac->available = qtest_available;
 157     ac->init = qtest_init_accel;
 158     ac->allowed = &qtest_allowed;
 159 }
 160
 161 #define TYPE_QTEST_ACCEL ACCEL_CLASS_NAME("qtest")
 162
 163 static const TypeInfo qtest_accel_type = {
 164     .name = TYPE_QTEST_ACCEL,
 165     .parent = TYPE_ACCEL,
 166     .class_init = qtest_accel_class_init,
 167 };
 168
 169 static void register_accel_types(void)
 170 {
 171     type_register_static(&accel_type);
 172     type_register_static(&tcg_accel_type);
 173     type_register_static(&xen_accel_type);
 174     type_register_static(&qtest_accel_type);
 175 }
 176
 177 type_init(register_accel_types);