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
  39 static 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 */
  47 static 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
  55 static 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     }
  69     return ret;
  70 }
  71
  72 void configure_accelerator(MachineState *ms, const char *progname)
  73 {
  74     const char *accel;
  75     char **accel_list, **tmp;
  76     int ret;
  77     bool accel_initialised = false;
  78     bool init_failed = false;
  79     AccelClass *acc = NULL;
  80
  81     accel = qemu_opt_get(qemu_get_machine_opts(), "accel");
  82     if (accel == NULL) {
  83         /* Select the default accelerator */
  84         int pnlen = strlen(progname);
  85         if (pnlen >= 3 && g_str_equal(&progname[pnlen - 3], "kvm")) {
  86             /* If the program name ends with "kvm", we prefer KVM */
  87             accel = "kvm:tcg";
  88         } else {
  89 #if defined(CONFIG_TCG)
  90             accel = "tcg";
  91 #elif defined(CONFIG_KVM)
  92             accel = "kvm";
  93 #else
  94 #error "No default accelerator available"
  95 #endif
  96         }
  97     }
  98
  99     accel_list = g_strsplit(accel, ":", 0);
 100
 101     for (tmp = accel_list; !accel_initialised && tmp && *tmp; tmp++) {
 102         acc = accel_find(*tmp);
 103         if (!acc) {
 104             continue;
 105         }
 106         if (acc->available && !acc->available()) {
 107             printf("%s not supported for this target\n",
 108                    acc->name);
 109             continue;
 110         }
 111         ret = accel_init_machine(acc, ms);
 112         if (ret < 0) {
 113             init_failed = true;
 114             error_report("failed to initialize %s: %s",
 115                          acc->name, strerror(-ret));
 116         } else {
 117             accel_initialised = true;
 118         }
 119     }
 120     g_strfreev(accel_list);
 121
 122     if (!accel_initialised) {
 123         if (!init_failed) {
 124             error_report("-machine accel=%s: No accelerator found", accel);
 125         }
 126         exit(1);
 127     }
 128
 129     if (init_failed) {
 130         error_report("Back to %s accelerator", acc->name);
 131     }
 132 }
 133
 134 void accel_setup_post(MachineState *ms)
 135 {
 136     AccelState *accel = ms->accelerator;
 137     AccelClass *acc = ACCEL_GET_CLASS(accel);
 138     if (acc->setup_post) {
 139         acc->setup_post(ms, accel);
 140     }
 141 }
 142
 143 static void register_accel_types(void)
 144 {
 145     type_register_static(&accel_type);
 146 }
 147
 148 type_init(register_accel_types);