accel/tcg/tcg-accel-ops.c

   1 /*
   2  * QEMU TCG vCPU common functionality
   3  *
   4  * Functionality common to all TCG vCPU variants: mttcg, rr and icount.
   5  *
   6  * Copyright (c) 2003-2008 Fabrice Bellard
   7  * Copyright (c) 2014 Red Hat Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qemu-common.h"
  30 #include "sysemu/tcg.h"
  31 #include "sysemu/replay.h"
  32 #include "qemu/main-loop.h"
  33 #include "qemu/guest-random.h"
  34 #include "exec/exec-all.h"
  35 #include "hw/boards.h"
  36
  37 #include "tcg-accel-ops.h"
  38 #include "tcg-accel-ops-mttcg.h"
  39 #include "tcg-accel-ops-rr.h"
  40 #include "tcg-accel-ops-icount.h"
  41
  42 /* common functionality among all TCG variants */
  43
  44 void tcg_cpus_destroy(CPUState *cpu)
  45 {
  46     cpu_thread_signal_destroyed(cpu);
  47 }
  48
  49 int tcg_cpus_exec(CPUState *cpu)
  50 {
  51     int ret;
  52 #ifdef CONFIG_PROFILER
  53     int64_t ti;
  54 #endif
  55     assert(tcg_enabled());
  56 #ifdef CONFIG_PROFILER
  57     ti = profile_getclock();
  58 #endif
  59     cpu_exec_start(cpu);
  60     ret = cpu_exec(cpu);
  61     cpu_exec_end(cpu);
  62 #ifdef CONFIG_PROFILER
  63     qatomic_set(&tcg_ctx->prof.cpu_exec_time,
  64                 tcg_ctx->prof.cpu_exec_time + profile_getclock() - ti);
  65 #endif
  66     return ret;
  67 }
  68
  69 /* mask must never be zero, except for A20 change call */
  70 void tcg_handle_interrupt(CPUState *cpu, int mask)
  71 {
  72     g_assert(qemu_mutex_iothread_locked());
  73
  74     cpu->interrupt_request |= mask;
  75
  76     /*
  77      * If called from iothread context, wake the target cpu in
  78      * case its halted.
  79      */
  80     if (!qemu_cpu_is_self(cpu)) {
  81         qemu_cpu_kick(cpu);
  82     } else {
  83         qatomic_set(&cpu_neg(cpu)->icount_decr.u16.high, -1);
  84     }
  85 }
  86
  87 static void tcg_accel_ops_init(AccelOpsClass *ops)
  88 {
  89     if (qemu_tcg_mttcg_enabled()) {
  90         ops->create_vcpu_thread = mttcg_start_vcpu_thread;
  91         ops->kick_vcpu_thread = mttcg_kick_vcpu_thread;
  92         ops->handle_interrupt = tcg_handle_interrupt;
  93     } else if (icount_enabled()) {
  94         ops->create_vcpu_thread = rr_start_vcpu_thread;
  95         ops->kick_vcpu_thread = rr_kick_vcpu_thread;
  96         ops->handle_interrupt = icount_handle_interrupt;
  97         ops->get_virtual_clock = icount_get;
  98         ops->get_elapsed_ticks = icount_get;
  99     } else {
 100         ops->create_vcpu_thread = rr_start_vcpu_thread;
 101         ops->kick_vcpu_thread = rr_kick_vcpu_thread;
 102         ops->handle_interrupt = tcg_handle_interrupt;
 103     }
 104 }
 105
 106 static void tcg_accel_ops_class_init(ObjectClass *oc, void *data)
 107 {
 108     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
 109
 110     ops->ops_init = tcg_accel_ops_init;
 111 }
 112
 113 static const TypeInfo tcg_accel_ops_type = {
 114     .name = ACCEL_OPS_NAME("tcg"),
 115
 116     .parent = TYPE_ACCEL_OPS,
 117     .class_init = tcg_accel_ops_class_init,
 118     .abstract = true,
 119 };
 120
 121 static void tcg_accel_ops_register_types(void)
 122 {
 123     type_register_static(&tcg_accel_ops_type);
 124 }
 125 type_init(tcg_accel_ops_register_types);