158 lines
4.8 KiB
C
158 lines
4.8 KiB
C
/*
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* QEMU TCG Multi Threaded vCPUs implementation
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2014 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "sysemu/tcg.h"
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#include "sysemu/replay.h"
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#include "sysemu/cpu-timers.h"
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#include "qemu/main-loop.h"
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#include "qemu/notify.h"
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#include "qemu/guest-random.h"
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#include "exec/exec-all.h"
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#include "hw/boards.h"
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#include "tcg-accel-ops.h"
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#include "tcg-accel-ops-mttcg.h"
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typedef struct MttcgForceRcuNotifier {
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Notifier notifier;
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CPUState *cpu;
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} MttcgForceRcuNotifier;
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static void do_nothing(CPUState *cpu, run_on_cpu_data d)
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{
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}
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static void mttcg_force_rcu(Notifier *notify, void *data)
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{
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CPUState *cpu = container_of(notify, MttcgForceRcuNotifier, notifier)->cpu;
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/*
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* Called with rcu_registry_lock held, using async_run_on_cpu() ensures
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* that there are no deadlocks.
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*/
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async_run_on_cpu(cpu, do_nothing, RUN_ON_CPU_NULL);
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}
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/*
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* In the multi-threaded case each vCPU has its own thread. The TLS
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* variable current_cpu can be used deep in the code to find the
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* current CPUState for a given thread.
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*/
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static void *mttcg_cpu_thread_fn(void *arg)
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{
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MttcgForceRcuNotifier force_rcu;
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CPUState *cpu = arg;
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assert(tcg_enabled());
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g_assert(!icount_enabled());
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tcg_cpu_init_cflags(cpu, current_machine->smp.max_cpus > 1);
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rcu_register_thread();
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force_rcu.notifier.notify = mttcg_force_rcu;
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force_rcu.cpu = cpu;
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rcu_add_force_rcu_notifier(&force_rcu.notifier);
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tcg_register_thread();
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qemu_mutex_lock_iothread();
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qemu_thread_get_self(cpu->thread);
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cpu->thread_id = qemu_get_thread_id();
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cpu->can_do_io = 1;
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current_cpu = cpu;
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cpu_thread_signal_created(cpu);
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qemu_guest_random_seed_thread_part2(cpu->random_seed);
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/* process any pending work */
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cpu->exit_request = 1;
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do {
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if (cpu_can_run(cpu)) {
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int r;
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qemu_mutex_unlock_iothread();
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r = tcg_cpus_exec(cpu);
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qemu_mutex_lock_iothread();
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switch (r) {
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case EXCP_DEBUG:
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cpu_handle_guest_debug(cpu);
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break;
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case EXCP_HALTED:
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/*
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* during start-up the vCPU is reset and the thread is
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* kicked several times. If we don't ensure we go back
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* to sleep in the halted state we won't cleanly
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* start-up when the vCPU is enabled.
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*
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* cpu->halted should ensure we sleep in wait_io_event
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*/
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g_assert(cpu->halted);
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break;
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case EXCP_ATOMIC:
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qemu_mutex_unlock_iothread();
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cpu_exec_step_atomic(cpu);
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qemu_mutex_lock_iothread();
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default:
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/* Ignore everything else? */
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break;
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}
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}
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qatomic_mb_set(&cpu->exit_request, 0);
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qemu_wait_io_event(cpu);
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} while (!cpu->unplug || cpu_can_run(cpu));
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tcg_cpus_destroy(cpu);
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qemu_mutex_unlock_iothread();
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rcu_remove_force_rcu_notifier(&force_rcu.notifier);
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rcu_unregister_thread();
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return NULL;
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}
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void mttcg_kick_vcpu_thread(CPUState *cpu)
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{
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cpu_exit(cpu);
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}
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void mttcg_start_vcpu_thread(CPUState *cpu)
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{
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char thread_name[VCPU_THREAD_NAME_SIZE];
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cpu->thread = g_new0(QemuThread, 1);
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cpu->halt_cond = g_malloc0(sizeof(QemuCond));
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qemu_cond_init(cpu->halt_cond);
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/* create a thread per vCPU with TCG (MTTCG) */
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snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG",
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cpu->cpu_index);
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qemu_thread_create(cpu->thread, thread_name, mttcg_cpu_thread_fn,
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cpu, QEMU_THREAD_JOINABLE);
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#ifdef _WIN32
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cpu->hThread = qemu_thread_get_handle(cpu->thread);
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#endif
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}
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