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