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); 126