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
  34 int tcg_tb_size;
  35 static bool tcg_allowed = true;
  36
  37 static int tcg_init(MachineClass *mc)
  38 {
  39     tcg_exec_init(tcg_tb_size * 1024 * 1024);
  40     return 0;
  41 }
  42
  43 typedef struct AccelType {
  44     const char *opt_name;
  45     const char *name;
  46     int (*available)(void);
  47     int (*init)(MachineClass *mc);
  48     bool *allowed;
  49 } AccelType;
  50
  51 static AccelType accel_list[] = {
  52     { "tcg", "tcg", tcg_available, tcg_init, &tcg_allowed },
  53     { "xen", "Xen", xen_available, xen_init, &xen_allowed },
  54     { "kvm", "KVM", kvm_available, kvm_init, &kvm_allowed },
  55     { "qtest", "QTest", qtest_available, qtest_init_accel, &qtest_allowed },
  56 };
  57
  58 int configure_accelerator(MachineClass *mc)
  59 {
  60     const char *p;
  61     char buf[10];
  62     int i, ret;
  63     bool accel_initialised = false;
  64     bool init_failed = false;
  65     AccelType *acc = NULL;
  66
  67     p = qemu_opt_get(qemu_get_machine_opts(), "accel");
  68     if (p == NULL) {
  69         /* Use the default "accelerator", tcg */
  70         p = "tcg";
  71     }
  72
  73     while (!accel_initialised && *p != '\0') {
  74         if (*p == ':') {
  75             p++;
  76         }
  77         p = get_opt_name(buf, sizeof(buf), p, ':');
  78         for (i = 0; i < ARRAY_SIZE(accel_list); i++) {
  79             acc = &accel_list[i];
  80             if (strcmp(acc->opt_name, buf) == 0) {
  81                 if (!acc->available()) {
  82                     printf("%s not supported for this target\n",
  83                            acc->name);
  84                     break;
  85                 }
  86                 *(acc->allowed) = true;
  87                 ret = acc->init(mc);
  88                 if (ret < 0) {
  89                     init_failed = true;
  90                     fprintf(stderr, "failed to initialize %s: %s\n",
  91                             acc->name,
  92                             strerror(-ret));
  93                     *(acc->allowed) = false;
  94                 } else {
  95                     accel_initialised = true;
  96                 }
  97                 break;
  98             }
  99         }
 100         if (i == ARRAY_SIZE(accel_list)) {
 101             fprintf(stderr, "\"%s\" accelerator does not exist.\n", buf);
 102         }
 103     }
 104
 105     if (!accel_initialised) {
 106         if (!init_failed) {
 107             fprintf(stderr, "No accelerator found!\n");
 108         }
 109         exit(1);
 110     }
 111
 112     if (init_failed) {
 113         fprintf(stderr, "Back to %s accelerator.\n", acc->name);
 114     }
 115
 116     return !accel_initialised;
 117 }