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