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
  36 #include "tcg-accel-ops.h"
  37 #include "tcg-accel-ops-mttcg.h"
  38 #include "tcg-accel-ops-rr.h"
  39 #include "tcg-accel-ops-icount.h"
  40
  41 /* common functionality among all TCG variants */
  42
  43 void tcg_cpu_init_cflags(CPUState *cpu, bool parallel)
  44 {
  45     uint32_t cflags = cpu->cluster_index << CF_CLUSTER_SHIFT;
  46     cflags |= parallel ? CF_PARALLEL : 0;
  47     cflags |= icount_enabled() ? CF_USE_ICOUNT : 0;
  48     cpu->tcg_cflags = cflags;
  49 }
  50
  51 void tcg_cpus_destroy(CPUState *cpu)
  52 {
  53     cpu_thread_signal_destroyed(cpu);
  54 }
  55
  56 int tcg_cpus_exec(CPUState *cpu)
  57 {
  58     int ret;
  59 #ifdef CONFIG_PROFILER
  60     int64_t ti;
  61 #endif
  62     assert(tcg_enabled());
  63 #ifdef CONFIG_PROFILER
  64     ti = profile_getclock();
  65 #endif
  66     cpu_exec_start(cpu);
  67     ret = cpu_exec(cpu);
  68     cpu_exec_end(cpu);
  69 #ifdef CONFIG_PROFILER
  70     qatomic_set(&tcg_ctx->prof.cpu_exec_time,
  71                 tcg_ctx->prof.cpu_exec_time + profile_getclock() - ti);
  72 #endif
  73     return ret;
  74 }
  75
  76 /* mask must never be zero, except for A20 change call */
  77 void tcg_handle_interrupt(CPUState *cpu, int mask)
  78 {
  79     g_assert(qemu_mutex_iothread_locked());
  80
  81     cpu->interrupt_request |= mask;
  82
  83     /*
  84      * If called from iothread context, wake the target cpu in
  85      * case its halted.
  86      */
  87     if (!qemu_cpu_is_self(cpu)) {
  88         qemu_cpu_kick(cpu);
  89     } else {
  90         qatomic_set(&cpu_neg(cpu)->icount_decr.u16.high, -1);
  91     }
  92 }
  93
  94 static void tcg_accel_ops_init(AccelOpsClass *ops)
  95 {
  96     if (qemu_tcg_mttcg_enabled()) {
  97         ops->create_vcpu_thread = mttcg_start_vcpu_thread;
  98         ops->kick_vcpu_thread = mttcg_kick_vcpu_thread;
  99         ops->handle_interrupt = tcg_handle_interrupt;
 100     } else if (icount_enabled()) {
 101         ops->create_vcpu_thread = rr_start_vcpu_thread;
 102         ops->kick_vcpu_thread = rr_kick_vcpu_thread;
 103         ops->handle_interrupt = icount_handle_interrupt;
 104         ops->get_virtual_clock = icount_get;
 105         ops->get_elapsed_ticks = icount_get;
 106     } else {
 107         ops->create_vcpu_thread = rr_start_vcpu_thread;
 108         ops->kick_vcpu_thread = rr_kick_vcpu_thread;
 109         ops->handle_interrupt = tcg_handle_interrupt;
 110     }
 111 }
 112
 113 static void tcg_accel_ops_class_init(ObjectClass *oc, void *data)
 114 {
 115     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
 116
 117     ops->ops_init = tcg_accel_ops_init;
 118 }
 119
 120 static const TypeInfo tcg_accel_ops_type = {
 121     .name = ACCEL_OPS_NAME("tcg"),
 122
 123     .parent = TYPE_ACCEL_OPS,
 124     .class_init = tcg_accel_ops_class_init,
 125     .abstract = true,
 126 };
 127
 128 static void tcg_accel_ops_register_types(void)
 129 {
 130     type_register_static(&tcg_accel_ops_type);
 131 }
 132 type_init(tcg_accel_ops_register_types);